#!/usr/bin/texlua

-- one can make a stub:
--
-- #!/bin/sh
-- env LUATEXDIR=/....../texmf/scripts/context/lua luatex --luaonly=luatools.lua "$@"
-- filename : luatools.lua
-- comment  : companion to context.tex
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files
-- Although this script is part of the ConTeXt distribution it is
-- relatively indepent of ConTeXt.  The same is true for some of
-- the luat files. We may may make them even less dependent in
-- the future. As long as Luatex is under development the
-- interfaces and names of functions may change.

banner = "version 1.1.1 - 2006+ - PRAGMA ADE / CONTEXT"
texlua = true

-- For the sake of independence we optionally can merge the library
-- code here. It's too much code, but that does not harm. Much of the
-- library code is used elsewhere. We don't want dependencies on
-- Lua library paths simply because these scripts are located in the
-- texmf tree and not in some Lua path. Normally this merge is not
-- needed when texmfstart is used, or when the proper stub is used or
-- when (windows) suffix binding is active.

-- begin library merge

-- filename : l-string.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-string'] = 1.001

--~ function string.split(str, pat) -- taken from the lua wiki
--~     local t = {n = 0} -- so this table has a length field, traverse with ipairs then!
--~     local fpat = "(.-)"..pat
--~     local last_end = 1
--~     local s, e, cap = string.find(str, fpat, 1)
--~     while s ~= nil do
--~         if s~=1 or cap~="" then
--~             table.insert(t,cap)
--~         end
--~         last_end = e+1
--~         s, e, cap = string.find(str, fpat, last_end)
--~     end
--~     if last_end<=string.len(str) then
--~         table.insert(t,(string.sub(str,last_end)))
--~     end
--~     return t
--~ end

--~ function string:split(pat) -- taken from the lua wiki but adapted
--~     local t = { }          -- self and colon usage (faster)
--~     local fpat = "(.-)"..pat
--~     local last_end = 1
--~     local s, e, cap = self:find(fpat, 1)
--~     while s ~= nil do
--~         if s~=1 or cap~="" then
--~             t[#t+1] = cap
--~         end
--~         last_end = e+1
--~         s, e, cap = self:find(fpat, last_end)
--~     end
--~     if last_end <= #self then
--~         t[#t+1] = self:sub(last_end)
--~     end
--~     return t
--~ end

--~ a piece of brilliant code by Rici Lake (posted on lua list) -- only names changed
--~
--~ function string:splitter(pat)
--~    local st, g = 1, self:gmatch("()"..pat.."()")
--~    local function splitter(self)
--~      if st then
--~        local s, f = g()
--~        local rv = self:sub(st, (s or 0)-1)
--~        st = f
--~        return rv
--~      end
--~    end
--~    return splitter, self
--~ end

function string:splitter(pat)
    -- by Rici Lake (posted on lua list) -- only names changed
    -- p 79 ref man: () returns position of match
    local st, g = 1, self:gmatch("()("..pat..")")
    local function strgetter(self, segs, seps, sep, cap1, ...)
        st = sep and seps + #sep
        return self:sub(segs, (seps or 0) - 1), cap1 or sep, ...
    end
    local function strsplitter(self)
        if st then return strgetter(self, st, g()) end
    end
    return strsplitter, self
end

function string:split(separator)
    local t = {}
    for k in self:splitter(separator) do t[#t+1] = k end
    return t
end

-- faster than a string:split:

function string:splitchr(chr)
    if #self > 0 then
        local t = { }
        for s in string.gmatch(self..chr,"(.-)"..chr) do
            t[#t+1] = s
        end
        return t
    else
        return { }
    end
end

--~ function string.piecewise(str, pat, fnc) -- variant of split
--~     local fpat = "(.-)"..pat
--~     local last_end = 1
--~     local s, e, cap = string.find(str, fpat, 1)
--~     while s ~= nil do
--~         if s~=1 or cap~="" then
--~             fnc(cap)
--~         end
--~         last_end = e+1
--~         s, e, cap = string.find(str, fpat, last_end)
--~     end
--~     if last_end <= #str then
--~         fnc((string.sub(str,last_end)))
--~     end
--~ end

function string.piecewise(str, pat, fnc) -- variant of split
    for k in string.splitter(str,pat) do fnc(k) end
end

--~ do if lpeg then

--~     -- this alternative is 30% faster esp when we cache them
--~     -- problem: no expressions

--~     splitters = { }

--~     function string:split(separator)
--~         if #self > 0 then
--~             local split = splitters[separator]
--~             if not split then
--~                 -- based on code by Roberto
--~                 local p = lpeg.P(separator)
--~                 local c = lpeg.C((1-p)^0)
--~                 split = lpeg.Ct(c*(p*c)^0)
--~                 splitters[separator] = split
--~             end
--~             return lpeg.match(split,self)
--~         else
--~             return { }
--~         end
--~     end

--~     string.splitchr = string.split

--~     function string:piecewise(separator,fnc)
--~         for _,v in pairs(self:split(separator)) do
--~             fnc(v)
--~         end
--~     end

--~ end end

string.chr_to_esc = {
    ["%"] = "%%",
    ["."] = "%.",
    ["+"] = "%+", ["-"] = "%-", ["*"] = "%*",
    ["^"] = "%^", ["$"] = "%$",
    ["["] = "%[", ["]"] = "%]",
    ["("] = "%(", [")"] = "%)",
    ["{"] = "%{", ["}"] = "%}"
}

function string:esc() -- variant 2
    return (self:gsub("(.)",string.chr_to_esc))
end

function string.unquote(str)
    return (str:gsub("^([\"\'])(.*)%1$","%2"))
end

function string.quote(str)
    return '"' .. str:unquote() .. '"'
end

function string:count(pattern) -- variant 3
    local n = 0
    for _ in self:gmatch(pattern) do
        n = n + 1
    end
    return n
end

function string:limit(n,sentinel)
    if #self > n then
        sentinel = sentinel or " ..."
        return self:sub(1,(n-#sentinel)) .. sentinel
    else
        return self
    end
end

function string:strip()
    return (self:gsub("^%s*(.-)%s*$", "%1"))
end

--~ function string.strip(str) -- slightly different
--~     return (string.gsub(string.gsub(str,"^%s*(.-)%s*$","%1"),"%s+"," "))
--~ end

function string:is_empty()
    return not self:find("%S")
end

function string:enhance(pattern,action)
    local ok, n = true, 0
    while ok do
        ok = false
        self = self:gsub(pattern, function(...)
            ok, n = true, n + 1
            return action(...)
        end)
    end
    return self, n
end

--~ function string:enhance(pattern,action)
--~     local ok, n = 0, 0
--~     repeat
--~         self, ok = self:gsub(pattern, function(...)
--~             n = n + 1
--~             return action(...)
--~         end)
--~     until ok == 0
--~     return self, n
--~ end

--~     function string:to_hex()
--~         if self then
--~             return (self:gsub("(.)",function(c)
--~                 return string.format("%02X",c:byte())
--~             end))
--~         else
--~             return ""
--~         end
--~     end

--~     function string:from_hex()
--~         if self then
--~             return (self:gsub("(..)",function(c)
--~                 return string.char(tonumber(c,16))
--~             end))
--~         else
--~             return ""
--~         end
--~     end

string.chr_to_hex = { }
string.hex_to_chr = { }

for i=0,255 do
    local c, h = string.char(i), string.format("%02X",i)
    string.chr_to_hex[c], string.hex_to_chr[h] = h, c
end

--~     function string:to_hex()
--~         if self then return (self:gsub("(.)",string.chr_to_hex)) else return "" end
--~     end

--~     function string:from_hex()
--~         if self then return (self:gsub("(..)",string.hex_to_chr)) else return "" end
--~     end

function string:to_hex()
    return ((self or ""):gsub("(.)",string.chr_to_hex))
end

function string:from_hex()
    return ((self or ""):gsub("(..)",string.hex_to_chr))
end

if not string.characters then

    local function nextchar(str, index)
        index = index + 1
        return (index <= #str) and index or nil, str:sub(index,index)
    end
    function string:characters()
        return nextchar, self, 0
    end
    local function nextbyte(str, index)
        index = index + 1
        return (index <= #str) and index or nil, string.byte(str:sub(index,index))
    end
    function string:bytes()
        return nextbyte, self, 0
    end

end

--~ function string:padd(n,chr)
--~     return self .. self.rep(chr or " ",n-#self)
--~ end

function string:padd(n,chr)
    local m = n-#self
    if m > 0 then
        return self .. self.rep(chr or " ",m)
    else
        return self
    end
end

function is_number(str)
    return str:find("^[%-%+]?[%d]-%.?[%d+]$") == 1
end

--~ print(is_number("1"))
--~ print(is_number("1.1"))
--~ print(is_number(".1"))
--~ print(is_number("-0.1"))
--~ print(is_number("+0.1"))
--~ print(is_number("-.1"))
--~ print(is_number("+.1"))

function string:split_settings() -- no {} handling, see l-aux for lpeg variant
    if self:find("=") then
        local t = { }
        for k,v in self:gmatch("(%a+)=([^%,]*)") do
            t[k] = v
        end
        return t
    else
        return nil
    end
end


-- filename : l-table.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-table'] = 1.001

table.join = table.concat

function table.strip(tab)
    local lst = { }
    for k, v in ipairs(tab) do
     -- s = string.gsub(v, "^%s*(.-)%s*$", "%1")
        s = v:gsub("^%s*(.-)%s*$", "%1")
        if s == "" then
            -- skip this one
        else
            lst[#lst+1] = s
        end
    end
    return lst
end

--~ function table.sortedkeys(tab)
--~     local srt = { }
--~     for key,_ in pairs(tab) do
--~         srt[#srt+1] = key
--~     end
--~     table.sort(srt)
--~     return srt
--~ end

function table.sortedkeys(tab)
    local srt, kind = { }, 0 -- 0=unknown 1=string, 2=number 3=mixed
    for key,_ in pairs(tab) do
        srt[#srt+1] = key
        if kind == 3 then
            -- no further check
        elseif type(key) == "string" then
            if kind == 2 then kind = 3 else kind = 1 end
        elseif type(key) == "number" then
            if kind == 1 then kind = 3 else kind = 2 end
        else
            kind = 3
        end
    end
    if kind == 0 or kind == 3 then
        table.sort(srt,function(a,b) return (tostring(a) < tostring(b)) end)
    else
        table.sort(srt)
    end
    return srt
end

function table.append(t, list)
    for _,v in pairs(list) do
        table.insert(t,v)
    end
end

function table.prepend(t, list)
    for k,v in pairs(list) do
        table.insert(t,k,v)
    end
end

function table.merge(t, ...)
    for _, list in ipairs({...}) do
        for k,v in pairs(list) do
            t[k] = v
        end
    end
end

function table.merged(...)
    local tmp = { }
    for _, list in ipairs({...}) do
        for k,v in pairs(list) do
            tmp[k] = v
        end
    end
    return tmp
end

if not table.fastcopy then

    function table.fastcopy(old) -- fast one
        if old then
            local new = { }
            for k,v in pairs(old) do
                if type(v) == "table" then
                    new[k] = table.copy(v)
                else
                    new[k] = v
                end
            end
            return new
        else
            return { }
        end
    end

end

if not table.copy then

    function table.copy(t, _lookup_table) -- taken from lua wiki
        _lookup_table = _lookup_table or { }
        local tcopy = {}
        if not _lookup_table[t] then
            _lookup_table[t] = tcopy
        end
        for i,v in pairs(t) do
            if type(i) == "table" then
                if _lookup_table[i] then
                    i = _lookup_table[i]
                else
                    i = table.copy(i, _lookup_table)
                end
            end
            if type(v) ~= "table" then
                tcopy[i] = v
            else
                if _lookup_table[v] then
                    tcopy[i] = _lookup_table[v]
                else
                    tcopy[i] = table.copy(v, _lookup_table)
                end
            end
        end
        return tcopy
    end

end

-- rougly: copy-loop : unpack : sub == 0.9 : 0.4 : 0.45 (so in critical apps, use unpack)

function table.sub(t,i,j)
    return { unpack(t,i,j) }
end

function table.replace(a,b)
    for k,v in pairs(b) do
        a[k] = v
    end
end

-- slower than #t on indexed tables (#t only returns the size of the numerically indexed slice)

function table.is_empty(t)
    return not t or not next(t)
end

function table.one_entry(t)
    local n = next(t)
    return n and not next(t,n)
end

function table.starts_at(t)
    return ipairs(t,1)(t,0)
end

do

    -- 34.055.092 32.403.326 arabtype.tma
    --  1.620.614  1.513.863 lmroman10-italic.tma
    --  1.325.585  1.233.044 lmroman10-regular.tma
    --  1.248.157  1.158.903 lmsans10-regular.tma
    --    194.646    153.120 lmtypewriter10-regular.tma
    --  1.771.678  1.658.461 palatinosanscom-bold.tma
    --  1.695.251  1.584.491 palatinosanscom-regular.tma
    -- 13.736.534 13.409.446 zapfinoextraltpro.tma

    -- 13.679.038 11.774.106 arabtype.tmc
    --    886.248    754.944 lmroman10-italic.tmc
    --    729.828    466.864 lmroman10-regular.tmc
    --    688.482    441.962 lmsans10-regular.tmc
    --    128.685     95.853 lmtypewriter10-regular.tmc
    --    715.929    582.985 palatinosanscom-bold.tmc
    --    669.942    540.126 palatinosanscom-regular.tmc
    --  1.560.588  1.317.000 zapfinoextraltpro.tmc

    table.serialize_functions = true
    table.serialize_compact   = true
    table.serialize_inline    = true

    local function key(k)
        if type(k) == "number" then -- or k:find("^%d+$") then
            return "["..k.."]"
        elseif noquotes and k:find("^%a[%a%d%_]*$") then
            return k
        else
            return '["'..k..'"]'
        end
    end

    local function simple_table(t)
        if #t > 0 then
            local n = 0
            for _,v in pairs(t) do
                n = n + 1
            end
            if n == #t then
                local tt = { }
                for _,v in ipairs(t) do
                    local tv = type(v)
                    if tv == "number" or tv == "boolean" then
                        tt[#tt+1] = tostring(v)
                    elseif tv == "string" then
                        tt[#tt+1] = ("%q"):format(v)
                    else
                        tt = nil
                        break
                    end
                end
                return tt
            end
        end
        return nil
    end

    local function serialize(root,name,handle,depth,level,reduce,noquotes,indexed)
        handle = handle or print
        reduce = reduce or false
        if depth then
            depth = depth .. " "
            if indexed then
                handle(("%s{"):format(depth))
            else
                handle(("%s%s={"):format(depth,key(name)))
            end
        else
            depth = ""
            if type(name) == "string" then
                if name == "return" then
                    handle("return {")
                else
                    handle(name .. "={")
                end
            elseif type(name) == "number" then
                handle("[" .. name .. "]={")
            elseif type(name) == "boolean" then
                if name then
                    handle("return {")
                else
                    handle("{")
                end
            else
                handle("t={")
            end
        end
        if root and next(root) then
            local compact = table.serialize_compact
            local inline  = compact and table.serialize_inline
            local first, last = nil, 0 -- #root cannot be trusted here
            if compact then
                for k,v in ipairs(root) do
                    if not first then first = k end
                    last = last + 1
                end
            end
            for _,k in pairs(table.sortedkeys(root)) do
                local v = root[k]
                local t = type(v)
                if compact and first and type(k) == "number" and k >= first and k <= last then
                    if t == "number" then
                        handle(("%s %s,"):format(depth,v))
                    elseif t == "string" then
                        if reduce and (v:find("^[%-%+]?[%d]-%.?[%d+]$") == 1) then
                            handle(("%s %s,"):format(depth,v))
                        else
                            handle(("%s %q,"):format(depth,v))
                        end
                    elseif t == "table" then
                        if not next(v) then
                            handle(("%s {},"):format(depth))
                        elseif inline then
                            local st = simple_table(v)
                            if st then
                                handle(("%s { %s },"):format(depth,table.concat(st,", ")))
                            else
                                serialize(v,k,handle,depth,level+1,reduce,noquotes,true)
                            end
                        else
                            serialize(v,k,handle,depth,level+1,reduce,noquotes,true)
                        end
                    elseif t == "boolean" then
                        handle(("%s %s,"):format(depth,tostring(v)))
                    elseif t == "function" then
                        if table.serialize_functions then
                            handle(('%s loadstring(%q),'):format(depth,string.dump(v)))
                        else
                            handle(('%s "function",'):format(depth))
                        end
                    else
                        handle(("%s %q,"):format(depth,tostring(v)))
                    end
                elseif k == "__p__" then -- parent
                    if false then
                        handle(("%s __p__=nil,"):format(depth))
                    end
                elseif t == "number" then
                    handle(("%s %s=%s,"):format(depth,key(k),v))
                elseif t == "string" then
                    if reduce and (v:find("^[%-%+]?[%d]-%.?[%d+]$") == 1) then
                        handle(("%s %s=%s,"):format(depth,key(k),v))
                    else
                        handle(("%s %s=%q,"):format(depth,key(k),v))
                    end
                elseif t == "table" then
                    if not next(v) then
                        handle(("%s %s={},"):format(depth,key(k)))
                    elseif inline then
                        local st = simple_table(v)
                        if st then
                            handle(("%s %s={ %s },"):format(depth,key(k),table.concat(st,", ")))
                        else
                            serialize(v,k,handle,depth,level+1,reduce,noquotes)
                        end
                    else
                        serialize(v,k,handle,depth,level+1,reduce,noquotes)
                    end
                elseif t == "boolean" then
                    handle(("%s %s=%s,"):format(depth,key(k),tostring(v)))
                elseif t == "function" then
                    if table.serialize_functions then
                        handle(('%s %s=loadstring(%q),'):format(depth,key(k),string.dump(v)))
                    else
                        handle(('%s %s="function",'):format(depth,key(k)))
                    end
                else
                    handle(("%s %s=%q,"):format(depth,key(k),tostring(v)))
                --  handle(('%s %s=loadstring(%q),'):format(depth,key(k),string.dump(function() return v end)))
                end
            end
            if level > 0 then
                handle(("%s},"):format(depth))
            else
                handle(("%s}"):format(depth))
            end
        else
            handle(("%s}"):format(depth))
        end
    end

    --~ name:
    --~
    --~ true     : return     { }
    --~ false    :            { }
    --~ nil      : t        = { }
    --~ string   : string   = { }
    --~ 'return' : return     { }
    --~ number   : [number] = { }

    function table.serialize(root,name,reduce,noquotes)
        local t = { }
        local function flush(s)
            t[#t+1] = s
        end
        serialize(root, name, flush, nil, 0, reduce, noquotes)
        return table.concat(t,"\n")
    end

    function table.tohandle(handle,root,name,reduce,noquotes)
        serialize(root, name, handle, nil, 0, reduce, noquotes)
    end

    -- sometimes tables are real use (zapfino extra pro is some 85M) in which
    -- case a stepwise serialization is nice; actually, we could consider:
    --
    -- for line in table.serializer(root,name,reduce,noquotes) do
    --    ...(line)
    -- end
    --
    -- so this is on the todo list

    table.tofile_maxtab = 2*1024

    function table.tofile(filename,root,name,reduce,noquotes)
        local f = io.open(filename,'w')
        if f then
            local concat = table.concat
            local maxtab = table.tofile_maxtab
            if maxtab > 1 then
                local t = { }
                local function flush(s)
                    t[#t+1] = s
                    if #t > maxtab then
                        f:write(concat(t,"\n"),"\n") -- hm, write(sometable) should be nice
                        t = { }
                    end
                end
                serialize(root, name, flush, nil, 0, reduce, noquotes)
                f:write(concat(t,"\n"),"\n")
            else
                local function flush(s)
                    f:write(s,"\n")
                end
                serialize(root, name, flush, nil, 0, reduce, noquotes)
            end
            f:close()
        end
    end

end

--~ t = {
--~     b = "123",
--~     a = "x",
--~     c = 1.23,
--~     d = "1.23",
--~     e = true,
--~     f = {
--~         d = "1.23",
--~         a = "x",
--~         b = "123",
--~         c = 1.23,
--~         e = true,
--~         f = {
--~             e = true,
--~             f = {
--~                 e = true
--~             },
--~         },
--~     },
--~     g = function() end
--~ }

--~ print(table.serialize(t), "\n")
--~ print(table.serialize(t,"name"), "\n")
--~ print(table.serialize(t,false), "\n")
--~ print(table.serialize(t,true), "\n")
--~ print(table.serialize(t,"name",true), "\n")
--~ print(table.serialize(t,"name",true,true), "\n")

do

    local function flatten(t,f,complete)
        for _,v in ipairs(t) do
            if type(v) == "table" then
                if complete or type(v[1]) == "table" then
                    flatten(v,f,complete)
                else
                    f[#f+1] = v
                end
            else
                f[#f+1] = v
            end
        end
    end

    function table.flatten(t)
        local f = { }
        flatten(t,f,true)
        return f
    end

    function table.unnest(t) -- bad name
        local f = { }
        flatten(t,f,false)
        return f
    end

    table.flatten_one_level = table.unnest

end

function table.insert_before_value(t,value,str)
    for i=1,#t do
        if t[i] == value then
            table.insert(t,i,str)
            return
        end
    end
    table.insert(t,1,str)
end

function table.insert_after_value(t,value,str)
    for i=1,#t do
        if t[i] == value then
            table.insert(t,i+1,str)
            return
        end
    end
    t[#t+1] = str
end

function table.are_equal(a,b,n,m)
    if #a == #b then
        n = n or 1
        m = m or #a
        for i=n,m do
            local ai, bi = a[i], b[i]
            if (ai==bi) or (type(ai)=="table" and type(bi)=="table" and table.are_equal(ai,bi)) then
                -- continue
            else
                return false
            end
        end
        return true
    else
        return false
    end
end

function table.compact(t)
    if t then
        for k,v in pairs(t) do
            if not next(v) then
                t[k] = nil
            end
        end
    end
end

function table.tohash(t)
    local h = { }
    for _, v in pairs(t) do -- no ipairs here
        h[v] = true
    end
    return h
end

--~ function table.are_equal(a,b)
--~     return table.serialize(a) == table.serialize(b)
--~ end



-- filename : l-io.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-io'] = 1.001

if string.find(os.getenv("PATH"),";") then
    io.fileseparator, io.pathseparator = "\\", ";"
else
    io.fileseparator, io.pathseparator = "/" , ":"
end

function io.loaddata(filename)
    local f = io.open(filename)
    if f then
        local data = f:read('*all')
        f:close()
        return data
    else
        return nil
    end
end

function io.savedata(filename,data,joiner)
    local f = io.open(filename, "wb")
    if f then
        if type(data) == "table" then
            f:write(table.join(data,joiner or ""))
        elseif type(data) == "function" then
            data(f)
        else
            f:write(data)
        end
        f:close()
    end
end

function io.exists(filename)
    local f = io.open(filename)
    if f == nil then
        return false
    else
        assert(f:close())
        return true
    end
end

function io.size(filename)
    local f = io.open(filename)
    if f == nil then
        return 0
    else
        local s = f:seek("end")
        assert(f:close())
        return s
    end
end

function io.noflines(f)
    local n = 0
    for _ in f:lines() do
        n = n + 1
    end
    f:seek('set',0)
    return n
end

--~ t, f, n = os.clock(), io.open("testbed/sample-utf16-bigendian-big.txt",'rb'), 0
--~ for a in io.characters(f) do n = n + 1 end
--~ print(string.format("characters: %s, time: %s", n, os.clock()-t))

do

    local nextchar = {
        [ 4] = function(f)
            return f:read(1), f:read(1), f:read(1), f:read(1)
        end,
        [ 2] = function(f)
            return f:read(1), f:read(1)
        end,
        [ 1] = function(f)
            return f:read(1)
        end,
        [-2] = function(f)
            local a = f:read(1)
            local b = f:read(1)
            return b, a
        end,
        [-4] = function(f)
            local a = f:read(1)
            local b = f:read(1)
            local c = f:read(1)
            local c = f:read(1)
            return d, c, b, a
        end
    }

    function io.characters(f,n)
        local sb = string.byte
        if f then
            return nextchar[n or 1], f
        else
            return nil, nil
        end
    end

end

do

    local nextbyte = {
        [4] = function(f)
            local a = f:read(1)
            local b = f:read(1)
            local c = f:read(1)
            local d = f:read(1)
            if d then
                return sb(a), sb(b), sb(c), sb(d)
            else
                return nil, nil, nil, nil
            end
        end,
        [2] = function(f)
            local a = f:read(1)
            local b = f:read(1)
            if b then
                return sb(a), sb(b)
            else
                return nil, nil
            end
        end,
        [1] = function (f)
            local a = f:read(1)
            if a then
                return sb(a)
            else
                return nil
            end
        end,
        [-2] = function (f)
            local a = f:read(1)
            local b = f:read(1)
            if b then
                return sb(b), sb(a)
            else
                return nil, nil
            end
        end,
        [-4] = function(f)
            local a = f:read(1)
            local b = f:read(1)
            local c = f:read(1)
            local d = f:read(1)
            if d then
                return sb(d), sb(c), sb(b), sb(a)
            else
                return nil, nil, nil, nil
            end
        end
    }

    function io.bytes(f,n)
        local sb = string.byte
        if f then
            return nextbyte[n or 1], f
        else
            return nil, nil
        end
    end

end


-- filename : l-number.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-number'] = 1.001

if not number then number = { } end



-- filename : l-os.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-os'] = 1.001

function os.resultof(command)
    return io.popen(command,"r"):read("*all")
end

--~ if not os.exec then -- still not ok
    os.exec = os.execute
--~ end

function os.launch(str)
    if os.platform == "windows" then
        os.execute("start " .. str)
    else
        os.execute(str .. " &")
    end
end

if not os.setenv then
    function os.setenv() return false end
end


-- filename : l-md5.lua
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-md5'] = 1.001

if md5 then do

    local function convert(str,fmt)
        return (string.gsub(md5.sum(str),".",function(chr) return string.format(fmt,string.byte(chr)) end))
    end

    if not md5.HEX then function md5.HEX(str) return convert(str,"%02X") end end
    if not md5.hex then function md5.hex(str) return convert(str,"%02x") end end
    if not md5.dec then function md5.dec(str) return convert(stt,"%03i") end end

end end


-- filename : l-file.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-file'] = 1.001

if not file then file = { } end

function file.removesuffix(filename)
    return filename:gsub("%.%a+$", "")
end

function file.addsuffix(filename, suffix)
    if not filename:find("%.%a-$") then
        return filename .. "." .. suffix
    else
        return filename
    end
end

function file.replacesuffix(filename, suffix)
    return filename:gsub("%.%a+$", "." .. suffix)
end

function file.dirname(name)
    return name:match("^(.+)[/\\].-$") or ""
end

function file.basename(name)
    return name:match("^.+[/\\](.-)$") or name
end

function file.extname(name)
    return name:match("^.+%.(.-)$") or  ""
end

function file.join(...)
    local t = { ... }
    for i=1,#t do
        t[i] = (t[i]:gsub("\\","/")):gsub("/+$","")
    end
    return table.concat(t,"/")
end

function file.is_writable(name)
    local f = io.open(name, 'w')
    if f then
        f:close()
        return true
    else
        return false
    end
end

function file.is_readable(name)
    local f = io.open(name,'r')
    if f then
        f:close()
        return true
    else
        return false
    end
end

--~ function file.split_path(str)
--~     if str:find(';') then
--~         return str:splitchr(";")
--~     else
--~         return str:splitchr(io.pathseparator)
--~     end
--~ end

-- todo: lpeg

function file.split_path(str)
    local t = { }
    str = str:gsub("\\", "/")
    str = str:gsub("(%a):([;/])", "%1\001%2")
    for name in str:gmatch("([^;:]+)") do
        if name ~= "" then
            name = name:gsub("\001",":")
            t[#t+1] = name
        end
    end
    return t
end

function file.join_path(tab)
    return table.concat(tab,io.pathseparator) -- can have trailing //
end

--~ print('test'           .. " == " .. file.collapse_path("test"))
--~ print("test/test"      .. " == " .. file.collapse_path("test/test"))
--~ print("test/test/test" .. " == " .. file.collapse_path("test/test/test"))
--~ print("test/test"      .. " == " .. file.collapse_path("test/../test/test"))
--~ print("test"           .. " == " .. file.collapse_path("test/../test"))
--~ print("../test"        .. " == " .. file.collapse_path("../test"))
--~ print("../test/"       .. " == " .. file.collapse_path("../test/"))
--~ print("a/a"            .. " == " .. file.collapse_path("a/b/c/../../a"))

function file.collapse_path(str)
    local ok, n = false, 0
    while not ok do
        ok = true
        str, n = str:gsub("[^%./]+/%.%./", function(s)
            ok = false
            return ""
        end)
    end
    return (str:gsub("/%./","/"))
end

function file.robustname(str)
    return (str:gsub("[^%a%d%/%-%.\\]+","-"))
end

file.readdata = io.loaddata
file.savedata = io.savedata


-- filename : l-dir.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-dir'] = 1.001

dir = { }

-- optimizing for no string.find (*) does not save time

if lfs then

    function dir.glob_pattern(path,patt,recurse,action)
        for name in lfs.dir(path) do
            local full = path .. '/' .. name
            local mode = lfs.attributes(full,'mode')
            if mode == 'file' then
                if name:find(patt) then
                    action(full)
                end
            elseif recurse and (mode == "directory") and (name ~= '.') and (name ~= "..") then
                dir.glob_pattern(full,patt,recurse,action)
            end
        end
    end

    function dir.glob(pattern, action)
        local t = { }
        local action = action or function(name) table.insert(t,name) end
        local path, patt = pattern:match("^(.*)/*%*%*/*(.-)$")
        local recurse = path and patt
        if not recurse then
            path, patt = pattern:match("^(.*)/(.-)$")
            if not (path and patt) then
                path, patt = '.', pattern
            end
        end
        patt = patt:gsub("([%.%-%+])", "%%%1")
        patt = patt:gsub("%*", ".*")
        patt = patt:gsub("%?", ".")
        patt = "^" .. patt .. "$"
     -- print('path: ' .. path .. ' | pattern: ' .. patt .. ' | recurse: ' .. tostring(recurse))
        dir.glob_pattern(path,patt,recurse,action)
        return t
    end

    -- t = dir.glob("c:/data/develop/context/sources/**/????-*.tex")
    -- t = dir.glob("c:/data/develop/tex/texmf/**/*.tex")
    -- t = dir.glob("c:/data/develop/context/texmf/**/*.tex")
    -- t = dir.glob("f:/minimal/tex/**/*")
    -- print(dir.ls("f:/minimal/tex/**/*"))
    -- print(dir.ls("*.tex"))

    function dir.ls(pattern)
        return table.concat(dir.glob(pattern),"\n")
    end

    --~ mkdirs("temp")
    --~ mkdirs("a/b/c")
    --~ mkdirs(".","/a/b/c")
    --~ mkdirs("a","b","c")

    function dir.mkdirs(...) -- root,... or ... ; root is not split
        local pth, err = "", false
        for k,v in pairs({...}) do
            if k == 1 then
                if not lfs.isdir(v) then
                 -- print("no root path " .. v)
                    err = true
                else
                    pth = v
                end
            elseif lfs.isdir(pth .. "/" .. v) then
                pth = pth .. "/" .. v
            else
                for _,s in pairs(v:split("/")) do
                    pth = pth .. "/" .. s
                    if not lfs.isdir(pth) then
                        ok = lfs.mkdir(pth)
                        if not lfs.isdir(pth) then
                            err = true
                        end
                    end
                    if err then break end
                end
            end
            if err then break end
        end
        return pth, not err
    end

end


-- filename : l-boolean.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-boolean'] = 1.001
if not boolean  then boolean  = { } end

function boolean.tonumber(b)
    if b then return 1 else return 0 end
end

function toboolean(str)
    if type(str) == "string" then
        return str == "true" or str == "yes" or str == "on" or str == "1"
    elseif type(str) == "number" then
        return tonumber(str) ~= 0
    else
        return str
    end
end

function string.is_boolean(str)
    if type(str) == "string" then
        if str == "true" or str == "yes" or str == "on" then
            return true
        elseif str == "false" or str == "no" or str == "off" then
            return false
        end
    end
    return nil
end

function boolean.alwaystrue()
    return true
end

function boolean.falsetrue()
    return false
end


-- filename : l-unicode.lua
-- comment  : split off from luat-inp
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-unicode'] = 1.001
if not unicode  then unicode  = { } end

if not garbagecollector then
    garbagecollector = {
        push = function() collectgarbage("stop")    end,
        pop  = function() collectgarbage("restart") end,
    }
end

-- 0  EF BB BF      UTF-8
-- 1  FF FE         UTF-16-little-endian
-- 2  FE FF         UTF-16-big-endian
-- 3  FF FE 00 00   UTF-32-little-endian
-- 4  00 00 FE FF   UTF-32-big-endian

unicode.utfname = {
    [0] = 'utf-8',
    [1] = 'utf-16-le',
    [2] = 'utf-16-be',
    [3] = 'utf-32-le',
    [4] = 'utf-32-be'
}

function unicode.utftype(f) -- \000 fails !
    local str = f:read(4)
    if not str then
        f:seek('set')
        return 0
    elseif str:find("^%z%z\254\255") then
        return 4
    elseif str:find("^\255\254%z%z") then
        return 3
    elseif str:find("^\254\255") then
        f:seek('set',2)
        return 2
    elseif str:find("^\255\254") then
        f:seek('set',2)
        return 1
    elseif str:find("^\239\187\191") then
        f:seek('set',3)
        return 0
    else
        f:seek('set')
        return 0
    end
end

function unicode.utf16_to_utf8(str, endian)
    garbagecollector.push()
    local result = { }
    local tc, uc = table.concat, unicode.utf8.char
    local tmp, n, m, p = { }, 0, 0, 0
    -- lf | cr | crlf / (cr:13, lf:10)
    local function doit()
        if n == 10 then
            if p ~= 13 then
                result[#result+1] = tc(tmp,"")
                tmp = { }
                p = 0
            end
        elseif n == 13 then
            result[#result+1] = tc(tmp,"")
            tmp = { }
            p = n
        else
            tmp[#tmp+1] = uc(n)
            p = 0
        end
    end
    for l,r in str:bytepairs() do
        if endian then
            n = l*256 + r
        else
            n = r*256 + l
        end
        if m > 0 then
            n = (m-0xD800)*0x400 + (n-0xDC00) + 0x10000
            m = 0
            doit()
        elseif n >= 0xD800 and n <= 0xDBFF then
            m = n
        else
            doit()
        end
    end
    if #tmp > 0 then
        result[#result+1] = tc(tmp,"")
    end
    garbagecollector.pop()
    return result
end

function unicode.utf32_to_utf8(str, endian)
    garbagecollector.push()
    local result = { }
    local tc, uc = table.concat, unicode.utf8.char
    local tmp, n, m, p = { }, 0, -1, 0
    -- lf | cr | crlf / (cr:13, lf:10)
    local function doit()
        if n == 10 then
            if p ~= 13 then
                result[#result+1] = tc(tmp,"")
                tmp = { }
                p = 0
            end
        elseif n == 13 then
            result[#result+1] = tc(tmp,"")
            tmp = { }
            p = n
        else
            tmp[#tmp+1] = uc(n)
            p = 0
        end
    end
    for a,b in str:bytepairs() do
        if a and b then
            if m < 0 then
                if endian then
                    m = a*256*256*256 + b*256*256
                else
                    m = b*256 + a
                end
            else
                if endian then
                    n = m + a*256 + b
                else
                    n = m + b*256*256*256 + a*256*256
                end
                m = -1
                doit()
            end
        else
            break
        end
    end
    if #tmp > 0 then
        result[#result+1] = tc(tmp,"")
    end
    garbagecollector.pop()
    return result
end


-- filename : l-utils.lua
-- comment  : split off from luat-lib
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['l-utils'] = 1.001

if not utils        then utils        = { } end
if not utils.merger then utils.merger = { } end
if not utils.lua    then utils.lua    = { } end

utils.merger.m_begin = "begin library merge"
utils.merger.m_end   = "end library merge"
utils.merger.pattern =
    "%c+" ..
    "%-%-%s+" .. utils.merger.m_begin ..
    "%c+(.-)%c+" ..
    "%-%-%s+" .. utils.merger.m_end ..
    "%c+"

function utils.merger._self_fake_()
    return
        "-- " .. "created merged file" .. "\n\n" ..
        "-- " .. utils.merger.m_begin  .. "\n\n" ..
        "-- " .. utils.merger.m_end    .. "\n\n"
end

function utils.report(...)
    print(...)
end

function utils.merger._self_load_(name)
    local f, data = io.open(name), ""
    if f then
        data = f:read("*all")
        f:close()
    end
    return data or ""
end

function utils.merger._self_save_(name, data)
    if data ~= "" then
        local f = io.open(name,'w')
        if f then
            f:write(data)
            f:close()
        end
    end
end

function utils.merger._self_swap_(data,code)
    if data ~= "" then
        return (data:gsub(utils.merger.pattern, function(s)
            return "\n\n" .. "-- "..utils.merger.m_begin .. "\n" .. code .. "\n" .. "-- "..utils.merger.m_end .. "\n\n"
        end, 1))
    else
        return ""
    end
end

function utils.merger._self_libs_(libs,list)
    local result, f = "", nil
    if type(libs) == 'string' then libs = { libs } end
    if type(list) == 'string' then list = { list } end
    for _, lib in ipairs(libs) do
        for _, pth in ipairs(list) do
            local name = string.gsub(pth .. "/" .. lib,"\\","/")
            f = io.open(name)
            if f then
            --  utils.report("merging library",name)
                result = result .. "\n" .. f:read("*all") .. "\n"
                f:close()
                list = { pth } -- speed up the search
                break
            else
            --  utils.report("no library",name)
            end
        end
    end
    return result or ""
end

function utils.merger.selfcreate(libs,list,target)
    if target then
        utils.merger._self_save_(
            target,
            utils.merger._self_swap_(
                utils.merger._self_fake_(),
                utils.merger._self_libs_(libs,list)
            )
        )
    end
end

function utils.merger.selfmerge(name,libs,list,target)
    utils.merger._self_save_(
        target or name,
        utils.merger._self_swap_(
            utils.merger._self_load_(name),
            utils.merger._self_libs_(libs,list)
        )
    )
end

function utils.merger.selfclean(name)
    utils.merger._self_save_(
        name,
        utils.merger._self_swap_(
            utils.merger._self_load_(name),
            ""
        )
    )
end

function utils.lua.compile(luafile, lucfile)
 -- utils.report("compiling",luafile,"into",lucfile)
    os.remove(lucfile)
    local command = "-s -o " .. string.quote(lucfile) .. " " .. string.quote(luafile)
    if os.execute("texluac " .. command) == 0 then
        return true
    elseif os.execute("luac " .. command) == 0 then
        return true
    else
        return false
    end
end



-- filename : luat-lib.lua
-- comment  : companion to luat-lib.tex
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['luat-lib'] = 1.001

-- mostcode moved to the l-*.lua and other luat-*.lua files

-- os / io

os.setlocale(nil,nil) -- useless feature and even dangerous in luatex

-- os.platform

-- mswin|bccwin|mingw|cygwin  windows
-- darwin|rhapsody|nextstep   macosx
-- netbsd|unix                unix
-- linux                      linux

if not io.fileseparator then
    if string.find(os.getenv("PATH"),";") then
        io.fileseparator, io.pathseparator, os.platform = "\\", ";", "windows"
    else
        io.fileseparator, io.pathseparator, os.platform = "/" , ":", "unix"
    end
end

if not os.platform then
    if io.pathseparator == ";" then
        os.platform = "windows"
    else
        os.platform = "unix"
    end
end

-- arg normalization
--
-- for k,v in pairs(arg) do print(k,v) end

if arg and (arg[0] == 'luatex' or arg[0] == 'luatex.exe') and arg[1] == "--luaonly" then
    arg[-1]=arg[0] arg[0]=arg[2] for k=3,#arg do arg[k-2]=arg[k] end arg[#arg]=nil arg[#arg]=nil
end

-- environment

if not environment then environment = { } end

environment.arguments            = { }
environment.files                = { }
environment.sorted_argument_keys = nil

environment.platform = os.platform

function environment.initialize_arguments(arg)
    environment.arguments = { }
    environment.files     = { }
    environment.sorted_argument_keys = nil
    for index, argument in pairs(arg) do
        if index > 0 then
            local flag, value = argument:match("^%-+(.+)=(.-)$")
            if flag then
                environment.arguments[flag] = string.unquote(value or "")
            else
                flag = argument:match("^%-+(.+)")
                if flag then
                    environment.arguments[flag] = true
                else
                    environment.files[#environment.files+1] = argument
                end
            end
        end
    end
    environment.ownname = environment.ownname or arg[0] or 'unknown.lua'
end

function environment.showarguments()
    for k,v in pairs(environment.arguments) do
        print(k .. " : " .. tostring(v))
    end
    if #environment.files > 0 then
        print("files : " .. table.concat(environment.files, " "))
    end
end

function environment.argument(name)
    if environment.arguments[name] then
        return environment.arguments[name]
    else
        if not environment.sorted_argument_keys then
            environment.sorted_argument_keys = { }
            for _,v in pairs(table.sortedkeys(environment.arguments)) do
                table.insert(environment.sorted_argument_keys, "^" .. v)
            end
        end
        for _,v in pairs(environment.sorted_argument_keys) do
            if name:find(v) then
                return environment.arguments[v:sub(2,#v)]
            end
        end
    end
    return nil
end

function environment.split_arguments(separator) -- rather special, cut-off before separator
    local done, before, after = false, { }, { }
    for _,v in ipairs(environment.original_arguments) do
        if not done and v == separator then
            done = true
        elseif done then
            after[#after+1] = v
        else
            before[#before+1] = v
        end
    end
    return before, after
end

function environment.reconstruct_commandline(arg)
    if not arg then arg = environment.original_arguments end
    local result = { }
    for _,a in ipairs(arg) do -- ipairs 1 .. #n
        local kk, vv = a:match("^(%-+.-)=(.+)$")
        if kk and vv then
            if vv:find(" ") then
                result[#result+1] = kk .. "=" .. string.quote(vv)
            else
                result[#result+1] = a
            end
        elseif a:find(" ") then
            result[#result+1] = string.quote(a)
        else
            result[#result+1] = a
        end
    end
    return table.join(result," ")
end

if arg then
    environment.initialize_arguments(arg)
    environment.original_arguments = arg
    arg = { } -- prevent duplicate handling
end


-- filename : luat-inp.lua
-- comment  : companion to luat-lib.tex
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

-- This lib is multi-purpose and can be loaded again later on so that
-- additional functionality becomes available. We will split this
-- module in components when we're done with prototyping.

-- This is the first code I wrote for LuaTeX, so it needs some cleanup.

-- To be considered: hash key lowercase, first entry in table filename
-- (any case), rest paths (so no need for optimization). Or maybe a
-- separate table that matches lowercase names to mixed case when
-- present. In that case the lower() cases can go away. I will do that
-- only when we run into problems with names ... well ... Iwona-Regular.

-- Beware, loading and saving is overloaded in luat-tmp!

-- todo: instances.[hashes,cnffiles,configurations,522] -> ipairs (alles check, sneller)

if not versions    then versions    = { } end versions['luat-inp'] = 1.001
if not environment then environment = { } end
if not file        then file        = { } end

if environment.aleph_mode == nil then environment.aleph_mode = true end -- temp hack

if not input            then input            = { } end
if not input.suffixes   then input.suffixes   = { } end
if not input.formats    then input.formats    = { } end
if not input.aux        then input.aux        = { } end

if not input.suffixmap  then input.suffixmap  = { } end

if not input.locators   then input.locators   = { } end  -- locate databases
if not input.hashers    then input.hashers    = { } end  -- load databases
if not input.generators then input.generators = { } end  -- generate databases
if not input.filters    then input.filters    = { } end  -- conversion filters

input.locators.notfound   = { nil }
input.hashers.notfound    = { nil }
input.generators.notfound = { nil }

input.cacheversion = '1.0.1'
input.banner       = nil
input.verbose      = false
input.debug        = false
input.cnfname      = 'texmf.cnf'
input.lsrname      = 'ls-R'
input.luasuffix    = '.tma'
input.lucsuffix    = '.tmc'

-- we use a cleaned up list / format=any is a wildcard, as is *name

input.formats['afm'] = 'AFMFONTS'       input.suffixes['afm'] = { 'afm' }
input.formats['enc'] = 'ENCFONTS'       input.suffixes['enc'] = { 'enc' }
input.formats['fmt'] = 'TEXFORMATS'     input.suffixes['fmt'] = { 'fmt' }
input.formats['map'] = 'TEXFONTMAPS'    input.suffixes['map'] = { 'map' }
input.formats['mp']  = 'MPINPUTS'       input.suffixes['mp']  = { 'mp' }
input.formats['ocp'] = 'OCPINPUTS'      input.suffixes['ocp'] = { 'ocp' }
input.formats['ofm'] = 'OFMFONTS'       input.suffixes['ofm'] = { 'ofm', 'tfm' }
input.formats['otf'] = 'OPENTYPEFONTS'  input.suffixes['otf'] = { 'otf' } -- 'ttf'
input.formats['opl'] = 'OPLFONTS'       input.suffixes['opl'] = { 'opl' }
input.formats['otp'] = 'OTPINPUTS'      input.suffixes['otp'] = { 'otp' }
input.formats['ovf'] = 'OVFFONTS'       input.suffixes['ovf'] = { 'ovf', 'vf' }
input.formats['ovp'] = 'OVPFONTS'       input.suffixes['ovp'] = { 'ovp' }
input.formats['tex'] = 'TEXINPUTS'      input.suffixes['tex'] = { 'tex' }
input.formats['tfm'] = 'TFMFONTS'       input.suffixes['tfm'] = { 'tfm' }
input.formats['ttf'] = 'TTFONTS'        input.suffixes['ttf'] = { 'ttf', 'ttc' }
input.formats['pfb'] = 'T1FONTS'        input.suffixes['pfb'] = { 'pfb', 'pfa' }
input.formats['vf']  = 'VFFONTS'        input.suffixes['vf']  = { 'vf' }

input.formats['fea'] = 'FONTFEATURES'   input.suffixes['fea'] = { 'fea' }
input.formats['cid'] = 'FONTCIDMAPS'    input.suffixes['cid'] = { 'cid', 'cidmap' }

input.formats ['texmfscripts'] = 'TEXMFSCRIPTS' -- new
input.suffixes['texmfscripts'] = { 'rb', 'pl', 'py' } -- 'lua'

input.formats ['lua'] = 'LUAINPUTS' -- new
input.suffixes['lua'] = { 'lua', 'luc', 'tma', 'tmc' }

-- here we catch a few new thingies (todo: add these paths to context.tmf)

function input.checkconfigdata(instance)
    local function fix(varname,default)
        local proname = varname .. "." .. instance.progname or "crap"
        if not instance.environment[proname] and not instance.variables[proname] == "" and not instance.environment[varname] and not instance.variables[varname] == "" then
            instance.variables[varname] = default
        end
    end
    fix("LUAINPUTS"   , ".;$TEXINPUTS;$TEXMFSCRIPTS")
    fix("FONTFEATURES", ".;$OPENTYPEFONTS;$TTFONTS;$T1FONTS;$AFMFONTS")
    fix("FONTCIDMAPS" , ".;$OPENTYPEFONTS;$TTFONTS;$T1FONTS;$AFMFONTS")
end

-- backward compatible ones

input.alternatives = { }

input.alternatives['map files']            = 'map'
input.alternatives['enc files']            = 'enc'
input.alternatives['cid files']            = 'cid'
input.alternatives['fea files']            = 'fea'
input.alternatives['opentype fonts']       = 'otf'
input.alternatives['truetype fonts']       = 'ttf'
input.alternatives['truetype collections'] = 'ttc'
input.alternatives['type1 fonts']          = 'pfb'

-- obscure ones

input.formats ['misc fonts'] = ''
input.suffixes['misc fonts'] = { }

input.formats     ['sfd']                      = 'SFDFONTS'
input.suffixes    ['sfd']                      = { 'sfd' }
input.alternatives['subfont definition files'] = 'sfd'

function input.reset()

    local instance = { }

    instance.rootpath        = ''
    instance.treepath        = ''
    instance.progname        = environment.progname or 'context'
    instance.engine          = environment.engine   or 'luatex'
    instance.format          = ''
    instance.environment     = { }
    instance.variables       = { }
    instance.expansions      = { }
    instance.files           = { }
    instance.remap           = { }
    instance.configuration   = { }
    instance.order           = { }
    instance.found           = { }
    instance.foundintrees    = { }
    instance.kpsevars        = { }
    instance.hashes          = { }
    instance.cnffiles        = { }
    instance.lists           = { }
    instance.remember        = true
    instance.diskcache       = true
    instance.renewcache      = false
    instance.scandisk        = true
    instance.cachepath       = nil
    instance.loaderror       = false
    instance.smallcache      = false
    instance.savelists       = true
    instance.cleanuppaths    = true
    instance.allresults      = false
    instance.pattern         = nil    -- lists
    instance.kpseonly        = false  -- lists
    instance.cachefile       = 'tmftools'
    instance.loadtime        = 0
    instance.starttime       = 0
    instance.stoptime        = 0
    instance.validfile       = function(path,name) return true end
    instance.data            = { } -- only for loading
    instance.sortdata        = false
    instance.force_suffixes  = true
    instance.dummy_path_expr = "^!*unset/*$"
    instance.fakepaths       = { }
    instance.lsrmode         = false

    if os.env then
        -- store once, freeze and faster
        for k,v in pairs(os.env) do
            instance.environment[k] = input.bare_variable(v)
        end
    else
        -- we will access os.env frequently
        for k,v in pairs({'HOME','TEXMF','TEXMFCNF','SELFAUTOPARENT'}) do
            local e = os.getenv(v)
            if e then
            --  input.report("setting",v,"to",input.bare_variable(e))
                instance.environment[v] = input.bare_variable(e)
            end
        end
    end

    -- cross referencing

    for k, v in pairs(input.suffixes) do
        for _, vv in pairs(v) do
            if vv then
                input.suffixmap[vv] = k
            end
        end
    end

    return instance

end

function input.bare_variable(str)
 -- return string.gsub(string.gsub(string.gsub(str,"%s+$",""),'^"(.+)"$',"%1"),"^'(.+)'$","%1")
    return str:gsub("\s*([\"\']?)(.+)%1\s*", "%2")
end

if texio then
    input.log = texio.write_nl
else
    input.log = print
end

function input.simple_logger(kind, name)
    if name and name ~= "" then
        if input.banner then
            input.log(input.banner..kind..": "..name)
        else
            input.log("<<"..kind..": "..name..">>")
        end
    else
        if input.banner then
            input.log(input.banner..kind..": no name")
        else
            input.log("<<"..kind..": no name>>")
        end
    end
end

function input.dummy_logger()
end

function input.settrace(n)
    input.trace = tonumber(n or 0)
    if input.trace > 0 then
        input.logger = input.simple_logger
        input.verbose = true
    else
        input.logger = function() end
    end
end

function input.report(...) -- inefficient
    if input.verbose then
        if input.banner then
            input.log(input.banner .. table.concat({...},' '))
        elseif input.logmode() == 'xml' then
            input.log("<t>"..table.concat({...},' ').."</t>")
        else
            input.log("<<"..table.concat({...},' ')..">>")
        end
    end
end

function input.reportlines(str)
    if type(str) == "string" then
        str = str:split("\n")
    end
    for _,v in pairs(str) do input.report(v) end
end

input.settrace(tonumber(os.getenv("MTX.INPUT.TRACE") or os.getenv("MTX_INPUT_TRACE") or input.trace or 0))

-- These functions can be used to test the performance, especially
-- loading the database files.

function input.start_timing(instance)
    if instance then
        instance.starttime = os.clock()
        if not instance.loadtime then
            instance.loadtime = 0
        end
    end
end

function input.stop_timing(instance, report)
    if instance and instance.starttime then
        instance.stoptime = os.clock()
        local loadtime = instance.stoptime - instance.starttime
        instance.loadtime = instance.loadtime + loadtime
        if report then
            input.report('load time', string.format("%0.3f",loadtime))
        end
        return loadtime
    else
        return 0
    end
end

input.stoptiming  = input.stop_timing
input.starttiming = input.start_timing

function input.elapsedtime(instance)
    return string.format("%0.3f",instance.loadtime or 0)
end

function input.report_loadtime(instance)
    if instance then
        input.report('total load time', input.elapsedtime(instance))
    end
end

function input.loadtime(instance)
    tex.print(input.elapsedtime(instance))
end

function input.env(instance,key)
    return instance.environment[key] or input.osenv(instance,key)
end

function input.osenv(instance,key)
    if instance.environment[key] == nil then
        local e = os.getenv(key)
        if e == nil then
            instance.environment[key] = "" -- false
        else
            instance.environment[key] = input.bare_variable(e)
        end
    end
    return instance.environment[key] or ""
end

-- we follow a rather traditional approach:
--
-- (1) texmf.cnf given in TEXMFCNF
-- (2) texmf.cnf searched in TEXMF/web2c
--
-- for the moment we don't expect a configuration file in a zip

function input.identify_cnf(instance)
    if #instance.cnffiles == 0 then
        if instance.treepath ~= "" then
            if instance.rootpath ~= "" then
                local t = instance.treepath:splitchr(',')
                for k,v in ipairs(t) do
                    t[k] = file.join(instance.rootpath,v)
                end
                instance.treepath = table.concat(t,',')
            end
            local t = instance.treepath:splitchr(',')
            instance.environment['TEXMF'] = input.bare_variable(instance.treepath)
            instance.environment['TEXMFCNF'] = file.join(t[1] or '.','texmf/web2c')
        end
        if instance.rootpath ~= "" then
            instance.environment['TEXMFCNF'] = file.join(instance.rootpath,'texmf/web2c')
            instance.environment['SELFAUTOPARENT'] = instance.rootpath
        end
        if input.env(instance,'TEXMFCNF') ~= "" then
            local t = input.split_path(input.env(instance,'TEXMFCNF'))
            t = input.aux.expanded_path(instance,t)
            input.aux.expand_vars(instance,t)
            for _,v in ipairs(t) do
                table.insert(instance.cnffiles,file.join(v,input.cnfname))
            end
        elseif input.env(instance,'SELFAUTOPARENT') == '.' then
            table.insert(instance.cnffiles,file.join('.',input.cnfname))
        else
            for _,v in ipairs({'texmf-local','texmf'}) do
                table.insert(instance.cnffiles,file.join(input.env(instance,'SELFAUTOPARENT'),v,'web2c',input.cnfname))
            end
        end
    end
end

function input.load_cnf(instance)
    -- instance.cnffiles contain complete names now !
    if #instance.cnffiles == 0 then
        input.report("no cnf files found (TEXMFCNF may not be set/known)")
    else
        instance.rootpath = instance.cnffiles[1]
        for k,fname in ipairs(instance.cnffiles) do
            instance.cnffiles[k] = fname:gsub("\\",'/')
        end
        for i = 1, 3 do
            instance.rootpath = file.dirname(instance.rootpath)
        end
        if instance.lsrmode then
            input.loadconfigdata(instance,instance.cnffiles)
        elseif instance.diskcache and not instance.renewcache then
            input.loadconfig(instance,instance.cnffiles)
            if instance.loaderror then
                input.loadconfigdata(instance,instance.cnffiles)
                input.saveconfig(instance)
            end
        else
            input.loadconfigdata(instance,instance.cnffiles)
            if instance.renewcache then
                input.saveconfig(instance)
            end
        end
        input.aux.collapse_cnf_data(instance)
    end
    input.checkconfigdata(instance)
end

function input.loadconfigdata(instance)
    for _, fname in ipairs(instance.cnffiles) do
        input.aux.load_cnf(instance,fname)
    end
end

if os.env then
    function input.aux.collapse_cnf_data(instance)
        for _,c in ipairs(instance.order) do
            for k,v in pairs(c) do
                if not instance.variables[k] then
                    if instance.environment[k] then
                        instance.variables[k] = instance.environment[k]
                    else
                        instance.kpsevars[k] = true
                        instance.variables[k] = input.bare_variable(v)
                    end
                end
            end
        end
    end
else
    function input.aux.collapse_cnf_data(instance)
        for _,c in ipairs(instance.order) do
            for k,v in pairs(c) do
                if not instance.variables[k] then
                    local e = os.getenv(k)
                    if e then
                        instance.environment[k] = input.bare_variable(e)
                        instance.variables[k]   = instance.environment[k]
                    else
                        instance.variables[k] = input.bare_variable(v)
                        instance.kpsevars[k]  = true
                    end
                end
            end
        end
    end
end

function input.aux.load_cnf(instance,fname)
    fname = input.clean_path(fname)
    local lname = fname:gsub("%.%a+$",input.luasuffix)
    local f = io.open(lname)
    if f then
        f:close()
        local dname = file.dirname(fname)
        if not instance.configuration[dname] then
            input.aux.load_data(instance,dname,'configuration',file.basename(lname))
            instance.order[#instance.order+1] = instance.configuration[dname]
        end
    else
        f = io.open(fname)
        if f then
            input.report("loading", fname)
            local line, data, n, k, v
            local dname = file.dirname(fname)
            if not instance.configuration[dname] then
                instance.configuration[dname] = { }
                instance.order[#instance.order+1] = instance.configuration[dname]
            end
            local data = instance.configuration[dname]
            while true do
                line = f:read()
                if line then
                    while true do -- join lines
                        line, n = line:gsub("\\%s*$", "")
                        if n > 0 then
                            line = line .. f:read()
                        else
                            break
                        end
                    end
                    if not line:find("^[%%#]") then
                        k, v = (line:gsub("%s*%%.*$","")):match("%s*(.-)%s*=%s*(.-)%s*$")
                        if k and v and not data[k] then
                            data[k] = (v:gsub("[%%#].*",'')):gsub("~", "$HOME")
                            instance.kpsevars[k] = true
                        end
                    end
                else
                    break
                end
            end
            f:close()
        else
            input.report("skipping", fname)
        end
    end
end

-- database loading

function input.load_hash(instance)
    input.locatelists(instance)
    if instance.lsrmode then
        input.loadlists(instance)
    elseif instance.diskcache and not instance.renewcache then
        input.loadfiles(instance)
        if instance.loaderror then
            input.loadlists(instance)
            input.savefiles(instance)
        end
    else
        input.loadlists(instance)
        if instance.renewcache then
            input.savefiles(instance)
        end
    end
end

function input.aux.append_hash(instance,type,tag,name)
    input.logger("= hash append",tag)
    table.insert(instance.hashes, { ['type']=type, ['tag']=tag, ['name']=name } )
end

function input.aux.prepend_hash(instance,type,tag,name)
    input.logger("= hash prepend",tag)
    table.insert(instance.hashes, 1, { ['type']=type, ['tag']=tag, ['name']=name } )
end

function input.aux.extend_texmf_var(instance,specification) -- crap
    if instance.environment['TEXMF'] then
        input.report("extending environment variable TEXMF with", specification)
        instance.environment['TEXMF'] = instance.environment['TEXMF']:gsub("^%{", function()
            return "{" .. specification .. ","
        end)
    elseif instance.variables['TEXMF'] then
        input.report("extending configuration variable TEXMF with", specification)
        instance.variables['TEXMF'] = instance.variables['TEXMF']:gsub("^%{", function()
            return "{" .. specification .. ","
        end)
    else
        input.report("setting configuration variable TEXMF to", specification)
        instance.variables['TEXMF'] = "{" .. specification .. "}"
    end
    if instance.variables['TEXMF']:find("%,") and not instance.variables['TEXMF']:find("^%{") then
        input.report("adding {} to complex TEXMF variable, best do that yourself")
        instance.variables['TEXMF'] = "{" .. instance.variables['TEXMF'] .. "}"
    end
    input.expand_variables(instance)
end

-- locators

function input.locatelists(instance)
    for _, path in pairs(input.simplified_list(input.expansion(instance,'TEXMF'))) do
        input.report("locating list of",path)
        input.locatedatabase(instance,input.normalize_name(path))
    end
end

function input.locatedatabase(instance,specification)
    return input.methodhandler('locators', instance, specification)
end

function input.locators.tex(instance,specification)
    if specification and specification ~= '' then
        local files = {
            file.join(specification,'files'..input.lucsuffix),
            file.join(specification,'files'..input.luasuffix),
            file.join(specification,input.lsrname)
        }
        for _, filename in pairs(files) do
            local f = io.open(filename)
            if f then
                input.logger('! tex locator', specification..' found')
                input.aux.append_hash(instance,'file',specification,filename)
                f:close()
                return
            end
        end
        input.logger('? tex locator', specification..' not found')
    end
end

-- hashers

function input.hashdatabase(instance,tag,name)
    return input.methodhandler('hashers',instance,tag,name)
end

function input.loadfiles(instance)
    instance.loaderror = false
    instance.files = { }
    if not instance.renewcache then
        for _, hash in ipairs(instance.hashes) do
            input.hashdatabase(instance,hash.tag,hash.name)
            if instance.loaderror then break end
        end
    end
end

function input.hashers.tex(instance,tag,name)
    input.aux.load_data(instance,tag,'files')
end

-- generators:

function input.loadlists(instance)
    for _, hash in ipairs(instance.hashes) do
        input.generatedatabase(instance,hash.tag)
    end
end

function input.generatedatabase(instance,specification)
    return input.methodhandler('generators', instance, specification)
end

function input.generators.tex(instance,specification)
    local tag = specification
    if not instance.lsrmode and lfs and lfs.dir then
        input.report("scanning path",specification)
        instance.files[tag] = { }
        local files = instance.files[tag]
        local n, m, r = 0, 0, 0
        local spec = specification .. '/'
        local attributes = lfs.attributes
        local directory = lfs.dir
        local small = instance.smallcache
        local function action(path)
            local mode, full
            if path then
                full = spec .. path .. '/'
            else
                full = spec
            end
            for name in directory(full) do
                if name:find("^%.") then
                  -- skip
                elseif name:find("[%~%`%!%#%$%%%^%&%*%(%)%=%{%}%[%]%:%;\"\'%|%|%<%>%,%?\n\r\t]") then
                  -- texio.write_nl("skipping " .. name)
                  -- skip
                else
                    mode = attributes(full..name,'mode')
                    if mode == "directory" then
                        m = m + 1
                        if path then
                            action(path..'/'..name)
                        else
                            action(name)
                        end
                    elseif path and mode == 'file' then
                        n = n + 1
                        local f = files[name]
                        if f then
                            if not small then
                                if type(f) == 'string' then
                                    files[name] = { f, path }
                                else
                                  f[#f+1] = path
                                end
                            end
                        else
                            files[name] = path
                            local lower = name:lower()
                            if name ~= lower then
                                files["remap:"..lower] = name
                                r = r + 1
                            end
                        end
                    end
                end
            end
        end
        action()
        input.report(string.format("%s files found on %s directories with %s uppercase remappings",n,m,r))
    else
        local fullname = file.join(specification,input.lsrname)
        local path     = '.'
        local f        = io.open(fullname)
        if f then
            instance.files[tag] = { }
            local files = instance.files[tag]
            local small = instance.smallcache
            input.report("loading lsr file",fullname)
        --  for line in f:lines() do -- much slower then the next one
            for line in (f:read("*a")):gmatch("(.-)\n") do
                if line:find("^[%a%d]") then
                    local fl = files[line]
                    if fl then
                        if not small then
                            if type(fl) == 'string' then
                                files[line] = { fl, path } -- table
                            else
                                fl[#fl+1] = path
                            end
                        end
                    else
                        files[line] = path -- string
                        local lower = line:lower()
                        if line ~= lower then
                            files["remap:"..lower] = line
                        end
                    end
                else
                    path = line:match("%.%/(.-)%:$") or path -- match could be nil due to empty line
                end
            end
            f:close()
        end
    end
end

-- savers, todo

function input.savefiles(instance)
    input.aux.save_data(instance, 'files', function(k,v)
        return instance.validfile(k,v) -- path, name
    end)
end

-- A config (optionally) has the paths split in tables. Internally
-- we join them and split them after the expansion has taken place. This
-- is more convenient.

function input.splitconfig(instance)
    for i,c in ipairs(instance.order) do
        for k,v in pairs(c) do
            if type(v) == 'string' then
                local t = file.split_path(v)
                if #t > 1 then
                    c[k] = t
                end
            end
        end
    end
end
function input.joinconfig(instance)
    for i,c in ipairs(instance.order) do
        for k,v in pairs(c) do
            if type(v) == 'table' then
                c[k] = file.join_path(v)
            end
        end
    end
end
function input.split_path(str)
    if type(str) == 'table' then
        return str
    else
        return file.split_path(str)
    end
end
function input.join_path(str)
    if type(str) == 'table' then
        return file.join_path(str)
    else
        return str
    end
end
function input.splitexpansions(instance)
    for k,v in pairs(instance.expansions) do
        local t = file.split_path(v)
        if #t >  1 then
            instance.expansions[k] = t
        end
    end
end
function input.splitexpansions(instance)
    for k,v in pairs(instance.expansions) do
        local t, h = { }, { }
        for _,vv in pairs(file.split_path(v)) do
            if vv ~= "" and not h[vv] then
                t[#t+1] = vv
                h[vv] = true
            end
        end
        if #t > 1 then
            instance.expansions[k] = t
        else
            instance.expansions[k] = t[1]
        end
    end
end

-- end of split/join code

function input.saveconfig(instance)
    input.splitconfig(instance)
    input.aux.save_data(instance, 'configuration', nil)
    input.joinconfig(instance)
end

input.configbanner = [[
-- This is a Luatex configuration file created by 'luatools.lua' or
-- 'luatex.exe' directly. For comment, suggestions and questions you can
-- contact the ConTeXt Development Team. This configuration file is
-- not copyrighted. [HH & TH]
]]

function input.aux.save_data(instance, dataname, check)
    for cachename, files in pairs(instance[dataname]) do
        local name = file.join(cachename,dataname)
        local luaname, lucname = name .. input.luasuffix, name .. input.lucsuffix
        local f = io.open(luaname,'w')
        if f then
            input.report("saving " .. dataname .. " in", luaname)
            f:write(input.configbanner)
            f:write("\n")
            f:write("if not texmf      then texmf      = { } end\n")
            f:write("if not texmf.data then texmf.data = { } end\n")
            f:write("\n")
            f:write("texmf.data.type    = '" .. dataname .. "'\n")
            f:write("texmf.data.version = '" .. input.cacheversion .. "'\n")
            f:write("texmf.data.date    = '" .. os.date("%Y-%m-%d") .. "'\n")
            f:write("texmf.data.time    = '" .. os.date("%H:%M:%S") .. "'\n")
            f:write('texmf.data.content = {\n')
            local function dump(k,v)
                if not check or check(v,k) then -- path, name
                    if type(v) == 'string' then
                        f:write("\t['" .. k .. "'] = '" .. v .. "',\n")
                    elseif #v == 1 then
                        f:write("\t['" .. k .. "'] = '" .. v[1] .. "',\n")
                    else
                        f:write("\t['" .. k .. "'] = {'" .. table.concat(v,"','").. "'},\n")
                    end
                end
            end
            if instance.sortdata then
                for _, k in pairs(table.sortedkeys(files)) do
                    dump(k,files[k])
                end
            else
                for k, v in pairs(files) do
                    dump(k,v)
                end
            end
            f:write('}\n')
            f:close()
            input.report("compiling " .. dataname .. " to", lucname)
            if not utils.lua.compile(luaname,lucname) then
                input.report("compiling failed for " .. dataname .. ", deleting file " .. lucname)
                os.remove(lucname)
            end
        else
            input.report("unable to save " .. dataname .. " in " .. name..input.luasuffix)
        end
    end
end

function input.loadconfig(instance)
    instance.configuration, instance.order, instance.loaderror = { }, { }, false
    if not instance.renewcache then
        for _, cnf in ipairs(instance.cnffiles) do
            local dname = file.dirname(cnf)
            input.aux.load_data(instance,dname,'configuration')
            instance.order[#instance.order+1] = instance.configuration[dname]
            if instance.loaderror then break end
        end
    end
    input.joinconfig(instance)
end

if not texmf      then texmf      = {} end
if not texmf.data then texmf.data = {} end

function input.aux.load_data(instance,pathname,dataname,filename)
    if not filename or (filename == "") then
        filename = dataname .. input.lucsuffix
    end
    local blob = loadfile(file.join(pathname,filename))
    if not blob then
        filename = dataname .. input.luasuffix
        blob = loadfile(file.join(pathname,filename))
    end
    if blob then
        blob()
        if (texmf.data.type == dataname) and (texmf.data.version == input.cacheversion) and texmf.data.content then
            input.report("loading",dataname,"for",pathname,"from",filename)
            instance[dataname][pathname] = texmf.data.content
        else
            input.report("skipping",dataname,"for",pathname,"from",filename)
            instance[dataname][pathname] = { }
            instance.loaderror = true
        end
    end
    texmf.data.content = { }
end

function input.expand_variables(instance)
    instance.expansions = { }
    if instance.engine   ~= "" then instance.environment['engine']   = instance.engine end
    if instance.progname ~= "" then instance.environment['progname'] = instance.engine end
    for k,v in pairs(instance.environment) do
        local a, b = k:match("^(%a+)%_(.*)%s*$")
        if a and b then
            instance.expansions[a..'.'..b] = v
        else
            instance.expansions[k] = v
        end
    end
    for k,v in pairs(instance.environment) do -- move environment to expansions
        if not instance.expansions[k] then instance.expansions[k] = v end
    end
    for k,v in pairs(instance.variables) do -- move variables to expansions
        if not instance.expansions[k] then instance.expansions[k] = v end
    end
    while true do
        local busy = false
        for k,v in pairs(instance.expansions) do
            local s, n = v:gsub("%$([%a%d%_%-]+)", function(a)
                busy = true
                return instance.expansions[a] or input.env(instance,a)
            end)
            local s, m = s:gsub("%$%{([%a%d%_%-]+)%}", function(a)
                busy = true
                return instance.expansions[a] or input.env(instance,a)
            end)
            if n > 0 or m > 0 then
                instance.expansions[k]= s
            end
        end
        if not busy then break end
    end
    for k,v in pairs(instance.expansions) do
        instance.expansions[k] = v:gsub("\\", '/')
    end
    input.splitexpansions(instance)
end

function input.aux.expand_vars(instance,lst) -- simple vars
    for k,v in pairs(lst) do
        lst[k] = v:gsub("%$([%a%d%_%-]+)", function(a)
            return instance.variables[a] or input.env(instance,a)
        end)
    end
end

function input.aux.expanded_var(instance,var) -- simple vars
    return var:gsub("%$([%a%d%_%-]+)", function(a)
        return instance.variables[a] or input.env(instance,a)
    end)
end

function input.aux.entry(instance,entries,name)
    if name and (name ~= "") then
        name = name:gsub('%$','')
        local result = entries[name..'.'..instance.progname] or entries[name]
        if result then
            return result
        else
            result = input.env(instance,name)
            if result then
                instance.variables[name] = result
                input.expand_variables(instance)
                return instance.expansions[name] or ""
            end
        end
    end
    return ""
end
function input.variable(instance,name)
    return input.aux.entry(instance,instance.variables,name)
end
function input.expansion(instance,name)
    return input.aux.entry(instance,instance.expansions,name)
end

function input.aux.is_entry(instance,entries,name)
    if name and name ~= "" then
        name = name:gsub('%$','')
        return (entries[name..'.'..instance.progname] or entries[name]) ~= nil
    else
        return false
    end
end

function input.is_variable(instance,name)
    return input.aux.is_entry(instance,instance.variables,name)
end
function input.is_expansion(instance,name)
    return input.aux.is_entry(instance,instance.expansions,name)
end

function input.aux.list(instance,list)
    local pat = string.upper(instance.pattern or "","")
    for _,key in pairs(table.sortedkeys(list)) do
        if (instance.pattern=="") or string.find(key:upper(),pat) then
            if instance.kpseonly then
                if instance.kpsevars[key] then
                    print(key .. "=" .. input.aux.tabstr(list[key]))
                end
            elseif instance.kpsevars[key] then
                print('K ' .. key .. "=" .. input.aux.tabstr(list[key]))
            else
                print('E ' .. key .. "=" .. input.aux.tabstr(list[key]))
            end
        end
    end
end

function input.list_variables(instance)
    input.aux.list(instance,instance.variables)
end
function input.list_expansions(instance)
    input.aux.list(instance,instance.expansions)
end

function input.list_configurations(instance)
    for _,key in pairs(table.sortedkeys(instance.kpsevars)) do
        if not instance.pattern or instance.pattern == "" or key:find(instance.pattern) then
            print(key.."\n")
            for i,c in ipairs(instance.order) do
                local str = c[key]
                if str then
                    print("\t" .. i .. "\t\t" .. input.aux.tabstr(str))
                end
            end
            print()
        end
    end
end

function input.aux.tabstr(str)
    if type(str) == 'table' then
        return table.concat(str," | ")
    else
        return str
    end
end

function input.simplified_list(str)
    if type(str) == 'table' then
        return str -- troubles ; ipv , in texmf
    elseif str == '' then
        return { }
    else
        local t = { }
        for _,v in ipairs(string.splitchr(str:gsub("^\{(.+)\}$","%1"),",")) do
            t[#t+1] = (v:gsub("^[%!]*(.+)[%/\\]*$","%1"))
        end
        return t
    end
end

function input.unexpanded_path_list(instance,str)
    local pth = input.variable(instance,str)
    local lst = input.split_path(pth)
    return input.aux.expanded_path(instance,lst)
end
function input.unexpanded_path(instance,str)
    return file.join_path(input.unexpanded_path_list(instance,str))
end

function input.expanded_path_list(instance,str)
    if not str then
        return { }
    elseif instance.savelists then
        -- engine+progname hash
        str = str:gsub("%$","")
        if not instance.lists[str] then -- cached
            local lst = input.split_path(input.expansion(instance,str))
            instance.lists[str] = input.aux.expanded_path(instance,lst)
        end
        return instance.lists[str]
    else
        local lst = input.split_path(input.expansion(instance,str))
        return input.aux.expanded_path(instance,lst)
    end
end
function input.expand_path(instance,str)
    return file.join_path(input.expanded_path_list(instance,str))
end

--~ function input.first_writable_path(instance,name)
--~     for _,v in pairs(input.expanded_path_list(instance,name)) do
--~         if file.is_writable(file.join(v,'luatex-cache.tmp')) then
--~             return v
--~         end
--~     end
--~     return "."
--~ end

function input.expanded_path_list_from_var(instance,str) -- brrr
    local tmp = input.var_of_format_or_suffix(str:gsub("%$",""))
    if tmp ~= "" then
        return input.expanded_path_list(instance,str)
    else
        return input.expanded_path_list(instance,tmp)
    end
end
function input.expand_path_from_var(instance,str)
    return file.join_path(input.expanded_path_list_from_var(instance,str))
end

function input.format_of_var(str)
    return input.formats[str] or input.formats[input.alternatives[str]] or ''
end
function input.format_of_suffix(str)
    return input.suffixmap[file.extname(str)] or 'tex'
end

function input.variable_of_format(str)
    return input.formats[str] or input.formats[input.alternatives[str]] or ''
end

function input.var_of_format_or_suffix(str)
    local v = input.formats[str]
    if v then
        return v
    end
    v = input.formats[input.alternatives[str]]
    if v then
        return v
    end
    v = input.suffixmap[file.extname(str)]
    if v then
        return input.formats[isf]
    end
    return ''
end

function input.expand_braces(instance,str) -- output variable and brace expansion of STRING
    local ori = input.variable(instance,str)
    local pth = input.aux.expanded_path(instance,input.split_path(ori))
    return file.join_path(pth)
end

-- {a,b,c,d}
-- a,b,c/{p,q,r},d
-- a,b,c/{p,q,r}/d/{x,y,z}//
-- a,b,c/{p,q/{x,y,z},r},d/{p,q,r}
-- a,b,c/{p,q/{x,y,z},r},d/{p,q,r}

function input.aux.expanded_path(instance,pathlist)
    -- a previous version fed back into pathlist
    local i, n, oldlist, newlist, ok = 0, 0, { }, { }, false
    for _,v in ipairs(pathlist) do
        if v:find("[{}]") then
            ok = true
            break
        end
    end
    if ok then
        for _,v in ipairs(pathlist) do
            oldlist[#oldlist+1] = (v:gsub("([\{\}])", function(p)
                if p == "{" then
                    i = i + 1
                    if i > n then n = i end
                    return "<" .. (i-1) .. ">"
                else
                    i = i - 1
                    return "</" .. i .. ">"
                end
            end))
        end
        for i=1,n do
            while true do
                local more = false
                local pattern = "^(.-)<"..(n-i)..">(.-)</"..(n-i)..">(.-)$"
                local t = { }
                for _,v in ipairs(oldlist) do
                    local pre, mid, post = v:match(pattern)
                    if pre and mid and post then
                        more = true
                        for vv in string.gmatch(mid..',',"(.-),") do
                            if vv == '.' then
                                t[#t+1] = pre..post
                            else
                                t[#t+1] = pre..vv..post
                            end
                        end
                    else
                        t[#t+1] = v
                    end
                end
                oldlist = t
                if not more then break end
            end
        end
        for _,v in ipairs(oldlist) do
            v = file.collapse_path(v)
            if v ~= "" and not v:find(instance.dummy_path_expr) then newlist[#newlist+1] = v end
        end
    else
        for _,v in ipairs(pathlist) do
            for vv in string.gmatch(v..',',"(.-),") do
                vv = file.collapse_path(v)
                if vv ~= "" then newlist[#newlist+1] = vv end
            end
        end
    end
    return newlist
end

--~ function input.is_readable(name) -- brrr, get rid of this
--~     return name:find("^zip##") or file.is_readable(name)
--~ end

input.is_readable = { }

function input.aux.is_readable(readable, name)
    if input.trace > 2 then
        if readable then
            input.logger("+ readable", name)
        else
            input.logger("- readable", name)
        end
    end
    return readable
end

function input.is_readable.file(name)
 -- return input.aux.is_readable(file.is_readable(name), name)
    return input.aux.is_readable(input.aux.is_file(name), name)
end

input.is_readable.tex = input.is_readable.file

-- name
-- name/name

function input.aux.collect_files(instance,names)
    local filelist = nil
    for _, fname in pairs(names) do
        if fname then
            if input.trace > 2 then
                input.logger("? blobpath asked",fname)
            end
            local bname = file.basename(fname)
            local dname = file.dirname(fname)
            if dname == "" or dname:find("^%.") then
                dname = false
            else
                dname = "/" .. dname .. "$"
            end
            for _, hash in ipairs(instance.hashes) do
                local blobpath = hash.tag
                local files = blobpath and instance.files[blobpath]
                if files then
                    if input.trace > 2 then
                        input.logger('? blobpath do',blobpath .. " (" .. bname ..")")
                    end
                    local blobfile = files[bname]
                    if not blobfile then
                        local rname = "remap:"..bname
                        blobfile = files[rname]
                        if blobfile then
                            bname = files[rname]
                            blobfile = files[bname]
                        end
                    end
                    if blobfile then
                        if type(blobfile) == 'string' then
                            if not dname or blobfile:find(dname) then
                                if not filelist then filelist = { } end
                             -- input.logger('= collected', blobpath.." | "..blobfile.." | "..bname)
                                filelist[#filelist+1] = file.join(blobpath,blobfile,bname)
                            end
                        else
                            for _, vv in pairs(blobfile) do
                                if not dname or vv:find(dname) then
                                    if not filelist then filelist = { } end
                                    filelist[#filelist+1] = file.join(blobpath,vv,bname)
                                end
                            end
                        end
                    end
                elseif input.trace > 1 then
                    input.logger('! blobpath no',blobpath .. " (" .. bname ..")" )
                end
            end
        end
    end
    return filelist
end

function input.suffix_of_format(str)
    if input.suffixes[str] then
        return input.suffixes[str][1]
    else
        return ""
    end
end

function input.suffixes_of_format(str)
    if input.suffixes[str] then
        return input.suffixes[str]
    else
        return {}
    end
end

function input.aux.qualified_path(filename) -- make platform dependent / not good yet
    return
        filename:find("^%.+/") or
        filename:find("^/") or
        filename:find("^%a+%:") or
        filename:find("^%a+##")
end

function input.normalize_name(original)
    -- internally we use type##spec##subspec ; this hackery slightly slows down searching
    local str = original or ""
    str = str:gsub("::",               "##")         -- ::             -> ##
    str = str:gsub("^(%a+)://"        ,"%1##")       -- zip://         -> zip##
    str = str:gsub("(.+)##(.+)##/(.+)","%1##%2##%3") -- ##/spec        -> ##spec
    if (input.trace>1) and (original ~= str) then
        input.logger('= normalizer',original.." -> "..str)
    end
    return str
end

-- split the next one up, better for jit

function input.aux.register_in_trees(instance,name)
    if not name:find("^%.") then
        instance.foundintrees[name] = (instance.foundintrees[name] or 0) + 1 -- maybe only one
    end
end

function input.aux.find_file(instance,filename) -- todo : plugin (scanners, checkers etc)
    local result = { }
    local stamp  = nil
    filename = input.normalize_name(filename)
    filename = file.collapse_path(filename:gsub("\\","/"))
    -- speed up / beware: format problem
    if instance.remember then
        stamp = filename .. "--" .. instance.engine .. "--" .. instance.progname .. "--" .. instance.format
        if instance.found[stamp] then
            input.logger('! remembered', filename)
            return instance.found[stamp]
        end
    end
    if filename:find('%*') then
        input.logger('! wildcard', filename)
        result = input.find_wildcard_files(instance,filename)
    elseif input.aux.qualified_path(filename) then
        if input.is_readable.file(filename) then
            input.logger('! qualified', filename)
            result = { filename }
        else
            local forcedname, ok = "", false
            if file.extname(filename) == "" then
                if instance.format == "" then
                    forcedname = filename .. ".tex"
                    if input.is_readable.file(forcedname) then
                        input.logger('! no suffix, forcing standard filetype tex')
                        result, ok = { forcedname }, true
                    end
                else
                    for _, s in pairs(input.suffixes_of_format(instance.format)) do
                        forcedname = filename .. "." .. s
                        if input.is_readable.file(forcedname) then
                            input.logger('! no suffix, forcing format filetype', s)
                            result, ok = { forcedname }, true
                            break
                        end
                    end
                end
            end
            if not ok then
                input.logger('? qualified', filename)
            end
        end
    else
        -- search spec
        local filetype, extra, done, wantedfiles, ext = '', nil, false, { }, file.extname(filename)
        if ext == "" then
            if not instance.force_suffixes then
                wantedfiles[#wantedfiles+1] = filename
            end
        else
            wantedfiles[#wantedfiles+1] = filename
        end
        if instance.format == "" then
            if ext == "" then
                local forcedname = filename .. '.tex'
                wantedfiles[#wantedfiles+1] = forcedname
                filetype = input.format_of_suffix(forcedname)
                input.logger('! forcing filetype',filetype)
            else
                filetype = input.format_of_suffix(filename)
                input.logger('! using suffix based filetype',filetype)
            end
        else
            if ext == "" then
                for _, s in pairs(input.suffixes_of_format(instance.format)) do
                    wantedfiles[#wantedfiles+1] = filename .. "." .. s
                end
            end
            filetype = instance.format
            input.logger('! using given filetype',filetype)
        end
        local typespec = input.variable_of_format(filetype)
        local pathlist = input.expanded_path_list(instance,typespec)
        if not pathlist or #pathlist == 0 then
            -- no pathlist, access check only
            if input.trace > 2 then
                input.logger('? filename',filename)
                input.logger('? filetype',filetype or '?')
                input.logger('? wanted files',table.concat(wantedfiles," | "))
            end
            for _, fname in pairs(wantedfiles) do
                if fname and input.is_readable.file(fname) then
                    filename, done = fname, true
                    result[#result+1] = file.join('.',fname)
                    break
                end
            end
            -- this is actually 'other text files' or 'any' or 'whatever'
            local filelist = input.aux.collect_files(instance,wantedfiles)
            filename = filelist and filelist[1]
            if filename then
                result[#result+1] = filename
                done = true
            end
        else
            -- list search
            local filelist = input.aux.collect_files(instance,wantedfiles)
            local doscan, recurse
            if input.trace > 2 then
                input.logger('? filename',filename)
                if pathlist then input.logger('? path list',table.concat(pathlist," | ")) end
                if filelist then input.logger('? file list',table.concat(filelist," | ")) end
            end
            -- a bit messy ... esp the doscan setting here
            for _, path in pairs(pathlist) do
                if path:find("^!!") then doscan  = false else doscan  = true  end
                if path:find("//$") then recurse = true  else recurse = false end
                local pathname = path:gsub("^!+", '')
                done = false
                -- using file list
                if filelist and not (done and not instance.allresults) and recurse then
                    -- compare list entries with permitted pattern
                    pathname = pathname:gsub("([%-%.])","%%%1") -- this also influences
                    pathname = pathname:gsub("/+$", '/.*')      -- later usage of pathname
                    pathname = pathname:gsub("//", '/.-/')
                    local expr = "^" .. pathname
                    -- input.debug('?',expr)
                    for _, f in pairs(filelist) do
                        if f:find(expr) then
                            -- input.debug('T',' '..f)
                            if input.trace > 2 then
                                input.logger('= found in hash',f)
                            end
                            result[#result+1] = f
                            input.aux.register_in_trees(instance,f) -- for tracing used files
                            done = true
                            if not instance.allresults then break end
                        else
                            -- input.debug('F',' '..f)
                        end
                    end
                end
                if not done and doscan then
                    -- check if on disk / unchecked / does not work at all
                    if input.method_is_file(pathname) then -- ?
                        local pname = pathname:gsub("%.%*$",'')
                        if not pname:find("%*") then
                            local ppname = pname:gsub("/+$","")
                            if input.aux.can_be_dir(instance,ppname) then
                                for _, w in pairs(wantedfiles) do
                                    local fname = file.join(ppname,w)
                                    if input.is_readable.file(fname) then
                                        if input.trace > 2 then
                                            input.logger('= found by scanning',fname)
                                        end
                                        result[#result+1] = fname
                                        done = true
                                        if not instance.allresults then break end
                                    end
                                end
                            else
                                -- no access needed for non existing path, speedup (esp in large tree with lots of fake)
                            end
                        end
                    end
                end
                if not done and doscan then
                    -- todo: slow path scanning
                end
                if done and not instance.allresults then break end
            end
        end
    end
    for k,v in pairs(result) do
        result[k] = file.collapse_path(v)
    end
    if instance.remember then
        instance.found[stamp] = result
    end
    return result
end

input.aux._find_file_ = input.aux.find_file

function input.aux.find_file(instance,filename) -- maybe make a lowres cache too
    local result = input.aux._find_file_(instance,filename)
    if #result == 0 then
        local lowered = filename:lower()
        if filename ~= lowered then
            return input.aux._find_file_(instance,lowered)
        end
    end
    return result
end

if lfs and lfs.isfile then
    input.aux.is_file = lfs.isfile      -- to be done: use this
else
    input.aux.is_file = file.is_readable
end

if lfs and lfs.isdir then
    function input.aux.can_be_dir(instance,name)
        if not instance.fakepaths[name] then
            if lfs.isdir(name) then
                instance.fakepaths[name] = 1 -- directory
            else
                instance.fakepaths[name] = 2 -- no directory
            end
        end
        return (instance.fakepaths[name] == 1)
    end
else
    function input.aux.can_be_dir()
        return true
    end
end

if not input.concatinators  then input.concatinators = { } end

function input.concatinators.tex(tag,path,name)
    return tag .. '/' .. path .. '/' .. name
end

input.concatinators.file = input.concatinators.tex

function input.find_files(instance,filename,filetype,mustexist)
    if type(mustexist) == boolean then
        -- all set
    elseif type(filetype) == 'boolean' then
        filetype, mustexist = nil, false
    elseif type(filetype) ~= 'string' then
        filetype, mustexist = nil, false
    end
    instance.format = filetype or ''
    local t = input.aux.find_file(instance,filename,true)
    instance.format = ''
    return t
end

function input.find_file(instance,filename,filetype,mustexist)
    return (input.find_files(instance,filename,filetype,mustexist)[1] or "")
end

function input.find_given_files(instance,filename)
    local bname, result = file.basename(filename), { }
    for k, hash in ipairs(instance.hashes) do
        local files = instance.files[hash.tag]
        local blist = files[bname]
        if not blist then
            local rname = "remap:"..bname
            blist = files[rname]
            if blist then
                bname = files[rname]
                blist = files[bname]
            end
        end
        if blist then
            if type(blist) == 'string' then
                result[#result+1] = input.concatinators[hash.type](hash.tag,blist,bname) or ""
                if not instance.allresults then break end
            else
                for kk,vv in pairs(blist) do
                    result[#result+1] = input.concatinators[hash.type](hash.tag,vv,bname) or ""
                    if not instance.allresults then break end
                end
            end
        end
    end
    return result
end

function input.find_given_file(instance,filename)
    return (input.find_given_files(instance,filename)[1] or "")
end

function input.find_wildcard_files(instance,filename) -- todo: remap:
    local result = { }
    local bname, dname = file.basename(filename), file.dirname(filename)
    local path = dname:gsub("^*/","")
    path = path:gsub("*",".*")
    path = path:gsub("-","%%-")
    if dname == "" then
        path = ".*"
    end
    local name = bname
    name = name:gsub("*",".*")
    name = name:gsub("-","%%-")
    path = path:lower()
    name = name:lower()
    local function doit(blist,bname,hash,allresults)
        local done = false
        if blist then
            if type(blist) == 'string' then
                -- make function and share code
                if (blist:lower()):find(path) then
                    result[#result+1] = input.concatinators[hash.type](hash.tag,blist,bname) or ""
                    done = true
                end
            else
                for kk,vv in pairs(blist) do
                    if (vv:lower()):find(path) then
                        result[#result+1] = input.concatinators[hash.type](hash.tag,vv,bname) or ""
                        done = true
                        if not allresults then break end
                    end
                end
            end
        end
        return done
    end
    local files, allresults, done = instance.files, instance.allresults, false
    if name:find("%*") then
        for k, hash in ipairs(instance.hashes) do
            for kk, hh in pairs(files[hash.tag]) do
                if not kk:find("^remap:") then
                    if (kk:lower()):find(name) then
                        if doit(hh,kk,hash,allresults) then done = true end
                        if done and not allresults then break end
                    end
                end
            end
        end
    else
        for k, hash in ipairs(instance.hashes) do
            if doit(files[hash.tag][bname],bname,hash,allresults) then done = true end
            if done and not allresults then break end
        end
    end
    return result
end

function input.find_wildcard_file(instance,filename)
    return (input.find_wildcard_files(instance,filename)[1] or "")
end

-- main user functions

function input.save_used_files_in_trees(instance, filename,jobname)
    if not filename then filename = 'luatex.jlg' end
    local f = io.open(filename,'w')
    if f then
        f:write("<?xml version='1.0' standalone='yes'?>\n")
        f:write("<rl:job>\n")
        if jobname then
            f:write("\t<rl:name>" .. jobname .. "</rl:name>\n")
        end
        f:write("\t<rl:files>\n")
        for _,v in pairs(table.sortedkeys(instance.foundintrees)) do
            f:write("\t\t<rl:file n='" .. instance.foundintrees[v] .. "'>" .. v .. "</rl:file>\n")
        end
        f:write("\t</rl:files>\n")
        f:write("</rl:usedfiles>\n")
        f:close()
    end
end

function input.automount(instance)
    -- implemented later
end

function input.load(instance)
    input.start_timing(instance)
    input.identify_cnf(instance)
    input.load_cnf(instance)
    input.expand_variables(instance)
    input.load_hash(instance)
    input.automount(instance)
    input.stop_timing(instance)
end

function input.for_files(instance, command, files, filetype, mustexist)
    if files and #files > 0 then
        local function report(str)
            if input.verbose then
                input.report(str) -- has already verbose
            else
                print(str)
            end
        end
        if input.verbose then
            report('')
        end
        for _, file in pairs(files) do
            local result = command(instance,file,filetype,mustexist)
            if type(result) == 'string' then
                report(result)
            else
                for _,v in pairs(result) do
                    report(v)
                end
            end
        end
    end
end

-- strtab

function input.var_value(instance,str)     -- output the value of variable $STRING.
    return input.variable(instance,str)
end
function input.expand_var(instance,str)    -- output variable expansion of STRING.
    return input.expansion(instance,str)
end
function input.show_path(instance,str)     -- output search path for file type NAME
    return file.join_path(input.expanded_path_list(instance,input.format_of_var(str)))
end

-- input.find_file(filename)
-- input.find_file(filename, filetype, mustexist)
-- input.find_file(filename, mustexist)
-- input.find_file(filename, filetype)

function input.aux.register_file(files, name, path)
    if files[name] then
        if type(files[name]) == 'string' then
            files[name] = { files[name], path }
        else
            files[name] = path
        end
    else
        files[name] = path
    end
end

-- zip:: zip## zip://
-- zip::pathtozipfile::pathinzipfile (also: pathtozipfile/pathinzipfile)
-- file::name
-- tex::name
-- kpse::name
-- kpse::format::name
-- parent::n::name
-- parent::name (default 2)

if not input.finders  then input.finders  = { } end
if not input.openers  then input.openers  = { } end
if not input.loaders  then input.loaders  = { } end

input.finders.notfound  = { nil }
input.openers.notfound  = { nil }
input.loaders.notfound  = { false, nil, 0 }

function input.splitmethod(filename)
    local method, specification = filename:match("^(.-)##(.+)$")
    if method and specification then
        return method, specification
    else
        return 'tex', filename
    end
end

function input.method_is_file(filename)
    local method, specification = input.splitmethod(filename)
    return method == 'tex' or method == 'file'
end

function input.methodhandler(what, instance, filename, filetype) -- ...
    local method, specification = input.splitmethod(filename)
    if method and specification then -- redundant
        if input[what][method] then
            input.logger('= handler',filename.." -> "..what.." | "..method.." | "..specification)
            return input[what][method](instance,specification,filetype)
        else
            return nil
        end
    else
        return input[what].tex(instance,filename,filetype)
    end
end

-- also inside next test?

function input.findtexfile(instance, filename, filetype)
    return input.methodhandler('finders',instance, input.normalize_name(filename), filetype)
end
function input.opentexfile(instance,filename)
    return input.methodhandler('openers',instance, input.normalize_name(filename))
end

function input.findbinfile(instance, filename, filetype)
    return input.methodhandler('finders',instance, input.normalize_name(filename), filetype)
end
function input.openbinfile(instance,filename)
    return input.methodhandler('loaders',instance, input.normalize_name(filename))
end

function input.loadbinfile(instance, filename, filetype)
    local fname = input.findbinfile(instance, input.normalize_name(filename), filetype)
    if fname and fname ~= "" then
        return input.openbinfile(instance,fname)
    else
        return unpack(input.loaders.notfound)
    end
end

function input.texdatablob(instance, filename, filetype)
    local ok, data, size = input.loadbinfile(instance, filename, filetype)
    return data or ""
end

function input.openfile(filename) -- brrr texmf.instance here  / todo ! ! ! ! !
    local fullname = input.findtexfile(texmf.instance, filename)
    if fullname and (fullname ~= "") then
        return input.opentexfile(texmf.instance, fullname)
    else
        return nil
    end
end

function input.logmode()
    return (os.getenv("MTX.LOG.MODE") or os.getenv("MTX_LOG_MODE") or "tex"):lower()
end

-- this is a prelude to engine/progname specific configuration files
-- in which case we can omit files meant for other programs and
-- packages

--- ctx

-- maybe texinputs + font paths
-- maybe positive selection tex/context fonts/tfm|afm|vf|opentype|type1|map|enc

input.validators            = { }
input.validators.visibility = { }

function input.validators.visibility.default(path, name)
    return true
end

function input.validators.visibility.context(path, name)
    path = path[1] or path -- some day a loop
    return not (
        path:find("latex")    or
--      path:find("doc")      or
        path:find("tex4ht")   or
        path:find("source")   or
--      path:find("config")   or
--      path:find("metafont") or
        path:find("lists$")   or
        name:find("%.tpm$")   or
        name:find("%.bak$")
    )
end

-- todo: describe which functions are public (maybe input.private. ... )

-- beware: i need to check where we still need a / on windows:

function input.clean_path(str)
--~     return (((str:gsub("\\","/")):gsub("^!+","")):gsub("//+","//"))
    return ((str:gsub("\\","/")):gsub("^!+",""))
end

function input.do_with_path(name,func)
    for _, v in pairs(input.expanded_path_list(instance,name)) do
        func("^"..input.clean_path(v))
    end
end

function input.do_with_var(name,func)
    func(input.aux.expanded_var(name))
end

function input.with_files(instance,pattern,handle)
    for _, hash in ipairs(instance.hashes) do
        local blobpath = hash.tag
        local blobtype = hash.type
        if blobpath then
            local files = instance.files[blobpath]
            if files then
                for k,v in pairs(files) do
                    if k:find("^remap:") then
                        k = files[k]
                        v = files[k] -- chained
                    end
                    if k:find(pattern) then
                        if type(v) == "string" then
                            handle(blobtype,blobpath,v,k)
                        else
                            for _,vv in pairs(v) do
                                handle(blobtype,blobpath,vv,k)
                            end
                        end
                    end
                end
            end
        end
    end
end

--~ function input.update_script(oldname,newname) -- oldname -> own.name, not per se a suffix
--~     newname = file.addsuffix(newname,"lua")
--~     local newscript = input.clean_path(input.find_file(instance, newname))
--~     local oldscript = input.clean_path(oldname)
--~     input.report("old script", oldscript)
--~     input.report("new script", newscript)
--~     if oldscript ~= newscript and (oldscript:find(file.removesuffix(newname).."$") or oldscript:find(newname.."$")) then
--~         local newdata = io.loaddata(newscript)
--~         if newdata then
--~             input.report("old script content replaced by new content")
--~             io.savedata(oldscript,newdata)
--~         end
--~     end
--~ end

function input.update_script(instance,oldname,newname) -- oldname -> own.name, not per se a suffix
    local scriptpath = "scripts/context/lua"
    newname = file.addsuffix(newname,"lua")
    local oldscript = input.clean_path(oldname)
    input.report("to be replaced old script", oldscript)
    local newscripts = input.find_files(instance, newname) or { }
    if #newscripts == 0 then
        input.report("unable to locate new script")
    else
        for _, newscript in ipairs(newscripts) do
            newscript = input.clean_path(newscript)
            input.report("checking new script", newscript)
            if oldscript == newscript then
                input.report("old and new script are the same")
            elseif not newscript:find(scriptpath) then
                input.report("new script should come from",scriptpath)
            elseif not (oldscript:find(file.removesuffix(newname).."$") or oldscript:find(newname.."$")) then
                input.report("invalid new script name")
            else
                local newdata = io.loaddata(newscript)
                if newdata then
                    input.report("old script content replaced by new content")
                    io.savedata(oldscript,newdata)
                    break
                else
                    input.report("unable to load new script")
                end
            end
        end
    end
end


if not modules then modules = { } end modules ['luat-tmp'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.tex",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

--[[ldx--
<p>This module deals with caching data. It sets up the paths and
implements loaders and savers for tables. Best is to set the
following variable. When not set, the usual paths will be
checked. Personally I prefer the (users) temporary path.</p>

</code>
TEXMFCACHE=$TMP;$TEMP;$TMPDIR;$TEMPDIR;$HOME;$TEXMFVAR;$VARTEXMF;.
</code>

<p>Currently we do no locking when we write files. This is no real
problem because most caching involves fonts and the chance of them
being written at the same time is small. We also need to extend
luatools with a recache feature.</p>
--ldx]]--

caches = caches  or { }
dir    = dir    or { }
texmf  = texmf  or { }

caches.path   = caches.path or nil
caches.base   = caches.base or "luatex-cache"
caches.more   = caches.more or "context"
caches.direct = false -- true is faster but may need huge amounts of memory
caches.trace  = false
caches.tree   = false
caches.temp   = caches.temp or os.getenv("TEXMFCACHE") or os.getenv("HOME") or os.getenv("HOMEPATH") or os.getenv("VARTEXMF") or os.getenv("TEXMFVAR") or os.getenv("TMP") or os.getenv("TEMP") or os.getenv("TMPDIR") or nil
caches.paths  = caches.paths or { caches.temp }

if not caches.temp or caches.temp == "" then
    print("\nFATAL ERROR: NO VALID TEMPORARY PATH\n")
    os.exit()
end

function caches.configpath(instance)
    return input.expand_var(instance,"TEXMFCNF")
end

function caches.treehash(instance)
    local tree = caches.configpath(instance)
    if not tree or tree == "" then
        return false
    else
        return md5.hex(tree)
    end
end

function caches.setpath(instance,...)
    if not caches.path then
        if lfs and instance then
            for _,v in  pairs(caches.paths) do
                for _,vv in pairs(input.expanded_path_list(instance,v)) do
                    if lfs.isdir(vv) then
                        caches.path = vv
                        break
                    end
                end
                if caches.path then break end
            end
        end
        if not caches.path then
            caches.path = caches.temp
        end
        caches.path = input.clean_path(caches.path) -- to be sure
        if lfs then
            caches.tree = caches.tree or caches.treehash(instance)
            if caches.tree then
                caches.path = dir.mkdirs(caches.path,caches.base,caches.more,caches.tree)
            else
                caches.path = dir.mkdirs(caches.path,caches.base,caches.more)
            end
        end
    end
    if not caches.path then
        caches.path = '.'
    end
    caches.path = input.clean_path(caches.path)
    if lfs and not table.is_empty({...}) then
        local pth = dir.mkdirs(caches.path,...)
        return pth
    end
    return caches.path
end

function caches.setluanames(path,name)
    return path .. "/" .. name .. ".tma", path .. "/" .. name .. ".tmc"
end

function caches.loaddata(path,name)
    local tmaname, tmcname = caches.setluanames(path,name)
    local loader = loadfile(tmcname) or loadfile(tmaname)
    if loader then
        return loader()
    else
        return false
    end
end

function caches.is_writable(filepath,filename)
    local tmaname, tmcname = caches.setluanames(filepath,filename)
    return file.is_writable(tmaname)
end

function caches.savedata(filepath,filename,data,raw) -- raw needed for file cache
    local tmaname, tmcname = caches.setluanames(filepath,filename)
    local reduce, simplify = true, true
    if raw then
        reduce, simplify = false, false
    end
    if caches.direct then
        file.savedata(tmaname, table.serialize(data,'return',true,true))
    else
        table.tofile (tmaname,                 data,'return',true,true) -- maybe not the last true
    end
    utils.lua.compile(tmaname, tmcname)
end

-- here we use the cache for format loading (texconfig.[formatname|jobname])

if tex and texconfig and texconfig.formatname and texconfig.formatname == "" then
    if not texconfig.luaname then texconfig.luaname = "cont-en.lua" end
    texconfig.formatname = caches.setpath(instance,"format") .. "/" .. texconfig.luaname:gsub("%.lu.$",".fmt")
end

--[[ldx--
<p>Once we found ourselves defining similar cache constructs
several times, containers were introduced. Containers are used
to collect tables in memory and reuse them when possible based
on (unique) hashes (to be provided by the calling function).</p>

<p>Caching to disk is disabled by default. Version numbers are
stored in the saved table which makes it possible to change the
table structures without bothering about the disk cache.</p>

<p>Examples of usage can be found in the font related code.</p>
--ldx]]--

containers       = { }
containers.trace = false

do -- local report

    local function report(container,tag,name)
        if caches.trace or containers.trace or container.trace then
            logs.report(string.format("%s cache",container.subcategory),string.format("%s: %s",tag,name or 'invalid'))
        end
    end

    function containers.define(category, subcategory, version, enabled)
        if category and subcategory then
            return {
                category = category,
                subcategory = subcategory,
                storage = { },
                enabled = enabled,
                version = version or 1.000,
                trace = false,
                path = caches.setpath(texmf.instance,category,subcategory),
            }
        else
            return nil
        end
    end

    function containers.is_usable(container, name)
        return container.enabled and caches.is_writable(container.path, name)
    end

    function containers.is_valid(container, name)
        if name and name ~= "" then
            local cs = container.storage[name]
            return cs and not table.is_empty(cs) and cs.cache_version == container.version
        else
            return false
        end
    end

    function containers.read(container,name)
        if container.enabled and not container.storage[name] then
            container.storage[name] = caches.loaddata(container.path,name)
            if containers.is_valid(container,name) then
                report(container,"loaded",name)
            else
                container.storage[name] = nil
            end
        end
        if container.storage[name] then
            report(container,"reusing",name)
        end
        return container.storage[name]
    end

    function containers.write(container, name, data)
        if data then
            data.cache_version = container.version
            if container.enabled then
                local unique, shared = data.unique, data.shared
                data.unique, data.shared = nil, nil
                caches.savedata(container.path, name, data)
                report(container,"saved",name)
                data.unique, data.shared = unique, shared
            end
            report(container,"stored",name)
            container.storage[name] = data
        end
        return data
    end

    function containers.content(container,name)
        return container.storage[name]
    end

end

-- since we want to use the cache instead of the tree, we will now
-- reimplement the saver.

input.usecache = true

function input.aux.save_data(instance, dataname, check)
    for cachename, files in pairs(instance[dataname]) do
        local name
        if input.usecache then
            name = file.join(caches.setpath(instance,"trees"),md5.hex(cachename))
        else
            name = file.join(cachename,dataname)
        end
        local luaname, lucname = name .. input.luasuffix, name .. input.lucsuffix
        input.report("preparing " .. dataname .. " in", luaname)
        for k, v in pairs(files) do
            if not check or check(v,k) then -- path, name
                if #v == 1 then
                    files[k] = v[1]
                end
            else
                files[k] = nil -- false
            end
        end
        local data = {
            type    = dataname,
            root    = cachename,
            version = input.cacheversion,
            date    = os.date("%Y-%m-%d"),
            time    = os.date("%H:%M:%S"),
            content = files,
        }
        local f = io.open(luaname,'w')
        if f then
            input.report("saving " .. dataname .. " in", luaname)
        --  f:write(table.serialize(data,'return'))
            f:write(input.serialize(data))
            f:close()
            input.report("compiling " .. dataname .. " to", lucname)
            if not utils.lua.compile(luaname,lucname) then
                input.report("compiling failed for " .. dataname .. ", deleting file " .. lucname)
                os.remove(lucname)
            end
        else
            input.report("unable to save " .. dataname .. " in " .. name..input.luasuffix)
        end
    end
end

function input.serialize(files)
    -- This version is somewhat optimized for the kind of
    -- tables that we deal with, so it's much faster than
    -- the generic serializer. This makes sense because
    -- luatools and mtxtools are called frequently. Okay,
    -- we pay a small price for properly tabbed tables.
    local t = { }
    local concat = table.concat
    local sorted = table.sortedkeys
    local function dump(k,v,m)
        if type(v) == 'string' then
            return m .. "['" .. k .. "']='" .. v .. "',"
        elseif #v == 1 then
            return m .. "['" .. k .. "']='" .. v[1] .. "',"
        else
            return m .. "['" .. k .. "']={'" .. concat(v,"','").. "'},"
        end
    end
    t[#t+1] = "return {"
    if instance.sortdata then
        for _, k in pairs(sorted(files)) do
            local fk  = files[k]
            if type(fk) == 'table' then
                t[#t+1] = "\t['" .. k .. "']={"
                for _, kk in pairs(sorted(fk)) do
                    t[#t+1] = dump(kk,fk[kk],"\t\t")
                end
                t[#t+1] = "\t},"
            else
                t[#t+1] = dump(k,fk,"\t")
            end
        end
    else
        for k, v in pairs(files) do
            if type(v) == 'table' then
                t[#t+1] = "\t['" .. k .. "']={"
                for kk,vv in pairs(v) do
                    t[#t+1] = dump(kk,vv,"\t\t")
                end
                t[#t+1] = "\t},"
            else
                t[#t+1] = dump(k,v,"\t")
            end
        end
    end
    t[#t+1] = "}"
    return concat(t,"\n")
end

function input.aux.load_data(instance,pathname,dataname,filename)
    local luaname, lucname, pname, fname
    if input.usecache then
        pname, fname = caches.setpath(instance,"trees"), md5.hex(pathname)
        filename = file.join(pname,fname)
    else
        if not filename or (filename == "") then
            filename = dataname
        end
        pname, fname = pathname, filename
    end
    luaname = file.join(pname,fname) .. input.luasuffix
    lucname = file.join(pname,fname) .. input.lucsuffix
    local blob = loadfile(lucname)
    if not blob then
        blob = loadfile(luaname)
    end
    if blob then
        local data = blob()
        if data and data.content and data.type == dataname and data.version == input.cacheversion then
            input.report("loading",dataname,"for",pathname,"from",filename)
            instance[dataname][pathname] = data.content
        else
            input.report("skipping",dataname,"for",pathname,"from",filename)
            instance[dataname][pathname] = { }
            instance.loaderror = true
        end
    else
        input.report("skipping",dataname,"for",pathname,"from",filename)
    end
end

-- we will make a better format, maybe something xml or just text

input.automounted = input.automounted or { }

function input.automount(instance,usecache)
    local mountpaths = input.simplified_list(input.expansion(instance,'TEXMFMOUNT'))
    if table.is_empty(mountpaths) and usecache then
        mountpaths = { caches.setpath(instance,"mount") }
    end
    if not table.is_empty(mountpaths) then
        input.starttiming(instance)
        for k, root in pairs(mountpaths) do
            local f = io.open(root.."/url.tmi")
            if f then
                for line in f:lines() do
                    if line then
                        if line:find("^[%%#%-]") then -- or %W
                            -- skip
                        elseif line:find("^zip://") then
                            input.report("mounting",line)
                            table.insert(input.automounted,line)
                            input.usezipfile(instance,line)
                        end
                    end
                end
                f:close()
            end
        end
        input.stoptiming(instance)
    end
end

-- store info in format

input.storage            = { }
input.storage.data       = { }
input.storage.min        = 0 -- 500
input.storage.max        = input.storage.min - 1
input.storage.trace      = false -- true
input.storage.done       = 0
input.storage.evaluators = { }
-- (evaluate,message,names)

function input.storage.register(...)
    input.storage.data[#input.storage.data+1] = { ... }
end

function input.storage.evaluate(name)
    input.storage.evaluators[#input.storage.evaluators+1] = name
end

function input.storage.finalize() -- we can prepend the string with "evaluate:"
    for _, t in ipairs(input.storage.evaluators) do
        for i, v in pairs(t) do
            if type(v) == "string" then
                t[i] = loadstring(v)()
            elseif type(v) == "table" then
                for _, vv in pairs(v) do
                    if type(vv) == "string" then
                        t[i] = loadstring(vv)()
                    end
                end
            end
        end
    end
end

function input.storage.dump()
    for name, data in ipairs(input.storage.data) do
        local evaluate, message, original, target = data[1], data[2], data[3] ,data[4]
        local name, initialize, finalize = nil, "", ""
        for str in string.gmatch(target,"([^%.]+)") do
            if name then
                name = name .. "." .. str
            else
                name = str
            end
            initialize = string.format("%s %s = %s or {} ", initialize, name, name)
        end
        if evaluate then
            finalize = "input.storage.evaluate(" .. name .. ")"
        end
        input.storage.max = input.storage.max + 1
        if input.storage.trace then
            logs.report('storage',string.format('saving %s in slot %s',message,input.storage.max))
            lua.bytecode[input.storage.max] = loadstring(
                initialize ..
                string.format("logs.report('storage','restoring %s from slot %s') ",message,input.storage.max) ..
                table.serialize(original,name) ..
                finalize
            )
        else
            lua.bytecode[input.storage.max] = loadstring(initialize .. table.serialize(original,name) .. finalize)
        end
    end
end

if lua.bytecode then -- from 0 upwards
    local i = input.storage.min
    while lua.bytecode[i] do
        lua.bytecode[i]()
        lua.bytecode[i] = nil
        i = i + 1
    end
    input.storage.done = i
end


-- filename : luat-zip.lua
-- comment  : companion to luat-lib.tex
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['luat-zip'] = 1.001

if zip and input then
    zip.supported = true
else
    zip           = { }
    zip.supported = false
end

if not zip.supported then

    if not input then input = { } end -- will go away

    function zip.openarchive        (...) return nil end -- needed ?
    function zip.closenarchive      (...)            end -- needed ?
    function input.registerzipfile  (...)            end -- needed ?
    function input.usezipfile       (...)            end -- needed ?

else

    function input.locators.zip(instance,specification)
        local name, spec = specification:match("^(.-)##(.-)$")
        local f = io.open(name or specification)
        if f then -- todo: reuse code
            input.logger('! zip locator', specification..' found')
            if name and spec then
                input.aux.append_hash(instance,'zip',"zip##"..specification,name)
                input.aux.extend_texmf_var(instance, "zip##"..specification)
            else
                input.aux.append_hash(instance,'zip',"zip##"..specification.."##",specification)
                input.aux.extend_texmf_var(instance, "zip##"..specification.."##")
            end
            f:close()
        else
            input.logger('? zip locator', specification..' not found')
        end
    end

    function input.hashers.zip(instance,tag,name)
        input.report("loading zip file",name,"as",tag)
        input.registerzipfile(instance,name,tag)
    end

    function input.concatinators.zip(tag,path,name)
        return tag .. path .. '/' .. name
    end

    function input.is_readable.zip(name)
        return true
    end

    function input.finders.zip(instance,filename,filetype)
        local archive, dataname = filename:match("^(.+)##/*(.+)$")
        if archive and dataname then
            local zfile = zip.openarchive(archive)
            if not zfile then
               archive = input.find_file(instance,archive,filetype)
               zfile = zip.openarchive(archive)
            end
            if zfile then
                input.logger('! zip finder',archive)
                local dfile = zfile:open(dataname)
                if dfile then
                    dfile = zfile:close()
                    input.logger('+ zip finder',filename)
                    return 'zip##' .. filename
                end
            else
                input.logger('? zip finder',archive)
            end
        end
        input.logger('- zip finder',filename)
        return unpack(input.finders.notfound)
    end

    function input.openers.zip(instance,filename)
        if filename and filename ~= "" then
            local archive, dataname = filename:match("^(.-)##/*(.+)$")
            if archive and dataname then
                local zfile= zip.openarchive(archive)
                if zfile then
                    input.logger('+ zip starter',archive)
                    local dfile = zfile:open(dataname)
                    if dfile then
                        input.show_open(filename)
                        return input.openers.text_opener(filename,dfile,'zip')
                    end
                else
                    input.logger('- zip starter',archive)
                end
            end
        end
        input.logger('- zip opener',filename)
        return unpack(input.openers.notfound)
    end

    function input.loaders.zip(instance, filename) -- we could use input.openers.zip
        if filename and filename ~= "" then
            input.logger('= zip loader',filename)
            local archive, dataname = filename:match("^(.+)##/*(.+)$")
            if archive and dataname then
                local zfile = zip.openarchive(archive)
                if zfile then
                    input.logger('= zip starter',archive)
                    local dfile = zfile:open(dataname)
                    if dfile then
                        input.show_load(filename)
                        input.logger('+ zip loader',filename)
                        local s = dfile:read("*all")
                        dfile:close()
                        return true, s, #s
                    end
                else
                    input.logger('- zip starter',archive)
                end
            end
        end
        input.logger('- zip loader',filename)
        return unpack(input.loaders.notfound)
    end

    zip.archives        = { }
    zip.registeredfiles = { }

    function zip.openarchive(name)
        if name and name ~= "" and not zip.archives[name] then
            zip.archives[name] = zip.open(name)
        end
        return zip.archives[name]
    end

    function zip.closearchive(name)
        if zip.archives[name] then
            zip.close(archives[name])
            zip.archives[name] = nil
        end
    end

    -- aparte register maken voor user (register tex / zip), runtime tree register
    -- todo: alleen url syntax toestaan
    -- user function: also handle zip::name::path

    function input.usezipfile(instance,zipname) -- todo zip://
        zipname = input.normalize_name(zipname)
        if not zipname:find("^zip##") then
            zipname = "zip##"..zipname
        end
        input.logger('! zip user','file '..zipname)
        if not zipname:find("^zip##(.+)##(.-)$") then
            zipname = zipname .. "##" -- dummy spec
        end
        local tag = zipname
        local name = zipname:match("zip##(.+)##.-")
        input.aux.prepend_hash(instance,'zip',tag,name)
        input.aux.extend_texmf_var(instance, tag)
        input.registerzipfile(instance,name,tag)
    end

    function input.registerzipfile(instance,zipname,tag)
        if not zip.registeredfiles[zipname] then
            input.start_timing(instance)
            local z = zip.open(zipname)
            if not z then
                zipname = input.find_file(instance,zipname)
                z = zip.open(zipname)
            end
            if z then
                input.logger("= zipfile","registering "..zipname)
                zip.registeredfiles[zipname] = z
                input.aux.register_zip_file(instance,zipname,tag)
            else
                input.logger("? zipfile","unknown "..zipname)
            end
            input.stop_timing(instance)
        end
    end

    function input.aux.register_zip_file(instance,zipname,tagname)
        if zip.registeredfiles[zipname] then
            if not tagname:find("^zip##") then
                tagname = "zip##" .. tagname
            end
            local path, name, n = nil, nil, 0
            if not instance.files[tagname] then
                instance.files[tagname] = { }
            end
            local files, filter = instance.files[tagname], ""
            local subtree = tagname:match("^zip##.+##(.+)$")
            if subtree then
                filter = "^"..subtree.."/(.+)/(.-)$"
            else
                filter = "^(.+)/(.-)$"
            end
            input.logger('= zip filter',filter)
            -- we can consider putting a files.luc in the file
            local register = input.aux.register_file
            for i, _ in zip.registeredfiles[zipname]:files() do
                path, name = i.filename:match(filter)
                if path then
                    if name and name ~= '' then
                        register(files, name, path)
                        n = n + 1
                    else
                        -- directory
                    end
                else
                    register(files, i.filename, '')
                    n = n + 1
                end
            end
            input.report(n, 'entries in', zipname)
        end
    end

end


-- filename : luat-zip.lua
-- comment  : companion to luat-lib.tex
-- author   : Hans Hagen, PRAGMA-ADE, Hasselt NL
-- copyright: PRAGMA ADE / ConTeXt Development Team
-- license  : see context related readme files

if not versions then versions = { } end versions['luat-tex'] = 1.001

-- special functions that deal with io

if texconfig and not texlua then

    input.level = input.level or 0

    if input.logmode() == 'xml' then
        function input.show_open(name)
            input.level = input.level + 1
            texio.write_nl("<f l='"..input.level.."' n='"..name.."'>")
        end
        function input.show_close(name)
            texio.write("</f> ")
            input.level = input.level - 1
        end
        function input.show_load(name)
            texio.write_nl("<f l='"..(input.level+1).."' n='"..name.."'/>") -- level?
        end
    else
        function input.show_open () end
        function input.show_close() end
        function input.show_load () end
    end

    function input.finders.generic(instance,tag,filename,filetype)
        local foundname = input.find_file(instance,filename,filetype)
        if foundname and foundname ~= "" then
            input.logger('+ ' .. tag .. ' finder',filename,'filetype')
            return foundname
        else
            input.logger('- ' .. tag .. ' finder',filename,'filetype')
            return unpack(input.finders.notfound)
        end
    end

    input.filters.dynamic_translator = nil
    input.filters.frozen_translator  = nil
    input.filters.utf_translator     = nil

    function input.openers.text_opener(filename,file_handle,tag)
        local u = unicode.utftype(file_handle)
        local t = { }
        if u > 0  then
            input.logger('+ ' .. tag .. ' opener (' .. unicode.utfname[u] .. ')',filename)
            local l
            if u > 2 then
                l = unicode.utf32_to_utf8(file_handle:read("*a"),u==4)
            else
                l = unicode.utf16_to_utf8(file_handle:read("*a"),u==2)
            end
            file_handle:close()
            t = {
                utftype = u, -- may go away
                lines = l,
                current = 0,
                handle = nil,
                noflines = #l,
                close = function()
                    input.logger('= ' .. tag .. ' closer (' .. unicode.utfname[u] .. ')',filename)
                    input.show_close(filename)
                end,
                reader = function(self)
                    if not self then self = t end
                    if self.current >= #self.lines then
                        return nil
                    else
                        self.current = self.current + 1
                        if input.filters.utf_translator then
                            return input.filters.utf_translator(self.lines[t.current])
                        else
                            return self.lines[self.current]
                        end
                    end
                end
            }
        else
            input.logger('+ ' .. tag .. ' opener',filename)
            -- todo: file;name -> freeze / eerste regel scannen -> freeze
            t = {
                reader = function(self)
                    if not self then self = t end -- not used
                    if input.filters.dynamic_translator then
                        return input.filters.dynamic_translator(file_handle:read())
                    elseif input.filters.utf_translator then
                        return input.filters.utf_translator(file_handle:read())
                    else
                        return file_handle:read()
                    end
                end,
                close = function()
                    input.logger('= ' .. tag .. ' closer',filename)
                    input.show_close(filename)
                    file_handle:close()
                end,
                handle = function()
                    return file_handle
                end,
                noflines = function()
                    t.noflines = io.noflines(file_handle)
                    return t.noflines
                end
            }
        end
        return t
    end

    function input.openers.generic(instance,tag,filename)
        if filename and filename ~= "" then
            local f = io.open(filename,"r")
            if f then
                input.show_open(filename)
                return input.openers.text_opener(filename,f,tag)
            end
        end
        input.logger('- ' .. tag .. ' opener',filename)
        return unpack(input.openers.notfound)
    end

    function input.loaders.generic(instance,tag,filename)
        if filename and filename ~= "" then
            local f = io.open(filename,"rb")
            if f then
                input.show_load(filename)
                input.logger('+ ' .. tag .. ' loader',filename)
                local s = f:read("*a")
                f:close()
                if s then
                    return true, s, #s
                end
            end
        end
        input.logger('- ' .. tag .. ' loader',filename)
        return unpack(input.loaders.notfound)
    end

    function input.finders.tex(instance,filename,filetype)
        return input.finders.generic(instance,'tex',filename,filetype)
    end
    function input.openers.tex(instance,filename)
        return input.openers.generic(instance,'tex',filename)
    end
    function input.loaders.tex(instance,filename)
        return input.loaders.generic(instance,'tex',filename)
    end

end

-- callback into the file io and related things; disabling kpse

if texconfig and not texlua then

    texconfig.kpse_init        = false
    texconfig.trace_file_names = input.logmode() == 'tex'
    texconfig.max_print_line   = 100000

    -- if still present, we overload kpse (put it off-line so to say)

    if not texmf then texmf = { } end

    if not texmf.instance then

        if not texmf.instance then -- prevent a second loading

            texmf.instance            = input.reset()
            texmf.instance.progname   = environment.progname or 'context'
            texmf.instance.engine     = environment.engine   or 'luatex'
            texmf.instance.validfile  = input.validctxfile

            input.load(texmf.instance)

        end

        if callback then
            callback.register('find_read_file'      , function(id,name) return input.findtexfile(texmf.instance,name) end)
            callback.register('open_read_file'      , function(   name) return input.opentexfile(texmf.instance,name) end)
        end

        if callback then
            callback.register('find_data_file'      , function(name) return input.findbinfile(texmf.instance,name,"tex") end)
            callback.register('find_enc_file'       , function(name) return input.findbinfile(texmf.instance,name,"enc") end)
            callback.register('find_font_file'      , function(name) return input.findbinfile(texmf.instance,name,"tfm") end)
            callback.register('find_format_file'    , function(name) return input.findbinfile(texmf.instance,name,"fmt") end)
            callback.register('find_image_file'     , function(name) return input.findbinfile(texmf.instance,name,"tex") end)
            callback.register('find_map_file'       , function(name) return input.findbinfile(texmf.instance,name,"map") end)
            callback.register('find_ocp_file'       , function(name) return input.findbinfile(texmf.instance,name,"ocp") end)
            callback.register('find_opentype_file'  , function(name) return input.findbinfile(texmf.instance,name,"otf") end)
            callback.register('find_output_file'    , function(name) return name                                         end)
            callback.register('find_pk_file'        , function(name) return input.findbinfile(texmf.instance,name,"pk")  end)
            callback.register('find_sfd_file'       , function(name) return input.findbinfile(texmf.instance,name,"sfd") end)
            callback.register('find_truetype_file'  , function(name) return input.findbinfile(texmf.instance,name,"ttf") end)
            callback.register('find_type1_file'     , function(name) return input.findbinfile(texmf.instance,name,"pfb") end)
            callback.register('find_vf_file'        , function(name) return input.findbinfile(texmf.instance,name,"vf")  end)

            callback.register('read_data_file'      , function(file) return input.loadbinfile(texmf.instance,file,"tex") end)
            callback.register('read_enc_file'       , function(file) return input.loadbinfile(texmf.instance,file,"enc") end)
            callback.register('read_font_file'      , function(file) return input.loadbinfile(texmf.instance,file,"tfm") end)
         -- format
         -- image
            callback.register('read_map_file'       , function(file) return input.loadbinfile(texmf.instance,file,"map") end)
            callback.register('read_ocp_file'       , function(file) return input.loadbinfile(texmf.instance,file,"ocp") end)
            callback.register('read_opentype_file'  , function(file) return input.loadbinfile(texmf.instance,file,"otf") end)
         -- output
            callback.register('read_pk_file'        , function(file) return input.loadbinfile(texmf.instance,file,"pk")  end)
            callback.register('read_sfd_file'       , function(file) return input.loadbinfile(texmf.instance,file,"sfd") end)
            callback.register('read_truetype_file'  , function(file) return input.loadbinfile(texmf.instance,file,"ttf") end)
            callback.register('read_type1_file'     , function(file) return input.loadbinfile(texmf.instance,file,"pfb") end)
            callback.register('read_vf_file'        , function(file) return input.loadbinfile(texmf.instance,file,"vf" ) end)
        end

        if callback and environment.aleph_mode then
            callback.register('find_font_file'      , function(name) return input.findbinfile(texmf.instance,name,"ofm") end)
            callback.register('read_font_file'      , function(file) return input.loadbinfile(texmf.instance,file,"ofm") end)
            callback.register('find_vf_file'        , function(name) return input.findbinfile(texmf.instance,name,"ovf") end)
            callback.register('read_vf_file'        , function(file) return input.loadbinfile(texmf.instance,file,"ovf") end)
        end

        if callback then
            callback.register('find_write_file'   , function(id,name) return name end)
        end

        if callback and (not config or (#config == 0)) then
            callback.register('find_format_file'  , function(name) return name end)
        end

        if callback and false then
            for k, v in pairs(callback.list()) do
                if not v then texio.write_nl("<w>callback "..k.." is not set</w>") end
            end
        end

        if callback then

            input.start_actions = { }
            input.stop_actions  = { }

            function input.register_start_actions(f) table.insert(input.start_actions, f) end
            function input.register_stop_actions (f) table.insert(input.stop_actions,  f) end

--~             callback.register('start_run', function() for _, a in pairs(input.start_actions) do a() end end)
--~             callback.register('stop_run' , function() for _, a in pairs(input.stop_actions ) do a() end end)

        end

        if callback and (input.logmode() == 'xml') then

            function input.start_page_number()
                texio.write_nl("<p real='" .. tex.count[0] .. "' page='"..tex.count[1].."' sub='"..tex.count[2].."'")
            end
            function input.stop_page_number()
                texio.write("/>")
                texio.write_nl("")
            end

            callback.register('start_page_number'  , input.start_page_number)
            callback.register('stop_page_number'   , input.stop_page_number )

            function input.report_output_pages(p,b)
                texio.write_nl("<v k='pages'>"..p.."</v>")
                texio.write_nl("<v k='bytes'>"..b.."</v>")
                texio.write_nl("")
            end
            function input.report_output_log()
            end

            callback.register('report_output_pages', input.report_output_pages)
            callback.register('report_output_log'  , input.report_output_log  )

            function input.start_run()
                texio.write_nl("<?xml version='1.0' standalone='yes'?>")
                texio.write_nl("<job xmlns='www.tug.org/luatex/schemas/context-job.rng'>")
                texio.write_nl("")
            end
            function input.stop_run()
                texio.write_nl("</job>")
            end
            function input.show_statistics()
                for k,v in pairs(status.list()) do
                    texio.write_nl("log","<v k='"..k.."'>"..tostring(v).."</v>")
                end
            end

            table.insert(input.start_actions, input.start_run)

            table.insert(input.stop_actions, input.show_statistics)
            table.insert(input.stop_actions, input.stop_run)

            function input.start_run() for _, a in pairs(input.start_actions) do a() end end
            function input.stop_run () for _, a in pairs(input.stop_actions ) do a() end end

            callback.register('start_run', input.start_run)
            callback.register('stop_run' , input.stop_run )

        end

    end

    if kpse then

        function kpse.find_file(filename,filetype,mustexist)
            return input.find_file(texmf.instance,filename,filetype,mustexist)
        end
        function kpse.expand_path(variable)
            return input.expand_path(texmf.instance,variable)
        end
        function kpse.expand_var(variable)
            return input.expand_var(texmf.instance,variable)
        end
        function kpse.expand_braces(variable)
            return input.expand_braces(texmf.instance,variable)
        end

    end

end

-- program specific configuration (memory settings and alike)

if texconfig and not texlua then

    if not luatex then luatex = { } end

    luatex.variablenames = {
        'main_memory', 'extra_mem_bot', 'extra_mem_top',
        'buf_size',
        'font_max', 'font_mem_size',
        'hash_extra', 'max_strings', 'pool_free', 'pool_size', 'string_vacancies',
        'obj_tab_size', 'pdf_mem_size', 'dest_names_size',
        'nest_size', 'param_size', 'save_size', 'stack_size',
        'trie_size', 'hyph_size',
        'ocp_stack_size', 'ocp_list_size', 'ocp_buf_size'
    }

    function luatex.variables()
        local t, x = { }, nil
        for _,v in pairs(luatex.variablenames) do
            x = input.var_value(texmf.instance,v)
            if x and x:find("^%d+$") then
                t[v] = tonumber(x)
            end
        end
        return t
    end

    function luatex.setvariables(tab)
        for k,v in pairs(luatex.variables()) do
            tab[k] = v
        end
    end

    if not luatex.variables_set then
        luatex.setvariables(texconfig)
        luatex.variables_set = true
    end

    texconfig.max_print_line = 100000

end

-- some tex basics

if not cs then cs = { } end

function cs.def(k,v)
    tex.sprint(tex.texcatcodes, "\\def\\" .. k .. "{" .. v .. "}")
end

function cs.chardef(k,v)
    tex.sprint(tex.texcatcodes, "\\chardef\\" .. k .. "=" .. v .. "\\relax")
end

function cs.boolcase(b)
    if b then tex.write(1) else tex.write(0) end
end

function cs.testcase(b)
    if b then
        tex.sprint(tex.texcatcodes, "\\firstoftwoarguments")
    else
        tex.sprint(tex.texcatcodes, "\\secondoftwoarguments")
    end
end


if not modules then modules = { } end modules ['luat-kps'] = {
    version   = 1.001,
    comment   = "companion to luatools.lua",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

--[[ldx--
<p>This file is used when we want the input handlers to behave like
<type>kpsewhich</type>. What to do with the following:</p>

<typing>
{$SELFAUTOLOC,$SELFAUTODIR,$SELFAUTOPARENT}{,{/share,}/texmf{-local,}/web2c}
$SELFAUTOLOC    : /usr/tex/bin/platform
$SELFAUTODIR    : /usr/tex/bin
$SELFAUTOPARENT : /usr/tex
</typing>

<p>How about just forgetting abou them?</p>
--ldx]]--

input          = input          or { }
input.suffixes = input.suffixes or { }
input.formats  = input.formats  or { }

input.suffixes['gf']                       = { '<resolution>gf' }
input.suffixes['pk']                       = { '<resolution>pk' }
input.suffixes['base']                     = { 'base' }
input.suffixes['bib']                      = { 'bib' }
input.suffixes['bst']                      = { 'bst' }
input.suffixes['cnf']                      = { 'cnf' }
input.suffixes['mem']                      = { 'mem' }
input.suffixes['mf']                       = { 'mf' }
input.suffixes['mfpool']                   = { 'pool' }
input.suffixes['mft']                      = { 'mft' }
input.suffixes['mppool']                   = { 'pool' }
input.suffixes['graphic/figure']           = { 'eps', 'epsi' }
input.suffixes['texpool']                  = { 'pool' }
input.suffixes['PostScript header']        = { 'pro' }
input.suffixes['ist']                      = { 'ist' }
input.suffixes['web']                      = { 'web', 'ch' }
input.suffixes['cweb']                     = { 'w', 'web', 'ch' }
input.suffixes['cmap files']               = { 'cmap' }
input.suffixes['lig files']                = { 'lig' }
input.suffixes['bitmap font']              = { }
input.suffixes['MetaPost support']         = { }
input.suffixes['TeX system documentation'] = { }
input.suffixes['TeX system sources']       = { }
input.suffixes['dvips config']             = { }
input.suffixes['type42 fonts']             = { }
input.suffixes['web2c files']              = { }
input.suffixes['other text files']         = { }
input.suffixes['other binary files']       = { }
input.suffixes['opentype fonts']           = { 'otf' }

input.suffixes['fmt']                      = { 'fmt' }
input.suffixes['texmfscripts']             = { 'rb','lua','py','pl' }

input.suffixes['pdftex config']            = { }
input.suffixes['Troff fonts']              = { }

input.suffixes['ls-R']                     = { }

--[[ldx--
<p>If you wondered abou tsome of the previous mappings, how about
the next bunch:</p>
--ldx]]--

input.formats['bib']                      = ''
input.formats['bst']                      = ''
input.formats['mft']                      = ''
input.formats['ist']                      = ''
input.formats['web']                      = ''
input.formats['cweb']                     = ''
input.formats['MetaPost support']         = ''
input.formats['TeX system documentation'] = ''
input.formats['TeX system sources']       = ''
input.formats['Troff fonts']              = ''
input.formats['dvips config']             = ''
input.formats['graphic/figure']           = ''
input.formats['ls-R']                     = ''
input.formats['other text files']         = ''
input.formats['other binary files']       = ''

input.formats['gf']                       = ''
input.formats['pk']                       = ''
input.formats['base']                     = 'MFBASES'
input.formats['cnf']                      = ''
input.formats['mem']                      = 'MPMEMS'
input.formats['mf']                       = 'MFINPUTS'
input.formats['mfpool']                   = 'MFPOOL'
input.formats['mppool']                   = 'MPPOOL'
input.formats['texpool']                  = 'TEXPOOL'
input.formats['PostScript header']        = 'TEXPSHEADERS'
input.formats['cmap files']               = 'CMAPFONTS'
input.formats['type42 fonts']             = 'T42FONTS'
input.formats['web2c files']              = 'WEB2C'
input.formats['pdftex config']            = 'PDFTEXCONFIG'
input.formats['texmfscripts']             = 'TEXMFSCRIPTS'
input.formats['bitmap font']              = ''
input.formats['lig files']                = 'LIGFONTS'


-- end library merge

-- We initialize some characteristics of this program. We need to
-- do this before we load the libraries, else own.name will not be
-- properly set (handy for selfcleaning the file). It's an ugly
-- looking piece of code.

own = { }

own.libs = { -- todo: check which ones are really needed
    'l-string.lua',
    'l-table.lua',
    'l-io.lua',
    'l-number.lua',
    'l-os.lua',
    'l-md5.lua',
    'l-file.lua',
    'l-dir.lua',
    'l-boolean.lua',
    'l-unicode.lua',
    'l-utils.lua',
    'luat-lib.lua',
    'luat-inp.lua',
    'luat-tmp.lua',
    'luat-zip.lua',
    'luat-tex.lua',
    'luat-kps.lua',
}

-- We need this hack till luatex is fixed.

if arg and arg[0] == 'luatex' and arg[1] == "--luaonly" then
    arg[-1]=arg[0] arg[0]=arg[2] for k=3,#arg do arg[k-2]=arg[k] end arg[#arg]=nil arg[#arg]=nil
end

-- End of hack.

own.name = (environment and environment.ownname) or arg[0] or 'luatools.lua'
own.path = string.match(own.name,"^(.+)[\\/].-$") or "."
own.list = { '.' }

if own.path ~= '.' then
    table.insert(own.list,own.path)
end

table.insert(own.list,own.path.."/../../../tex/context/base")
table.insert(own.list,own.path.."/mtx")
table.insert(own.list,own.path.."/../sources")

function locate_libs()
    for _, lib in pairs(own.libs) do
        for _, pth in pairs(own.list) do
            local filename = string.gsub(pth .. "/" .. lib,"\\","/")
            local codeblob = loadfile(filename)
            if codeblob then
                codeblob()
                own.list = { pth } -- speed up te search
                break
            end
        end
    end
end

if not input then
    locate_libs()
end

if not input then
    print("")
    print("Luatools is unable to start up due to lack of libraries. You may")
    print("try to run 'lua luatools.lua --selfmerge' in the path where this")
    print("script is located (normally under ..../scripts/context/lua) which")
    print("will make luatools library independent.")
    os.exit()
end

instance            = input.reset()
input.verbose       = environment.arguments["verbose"]  or false
input.banner        = 'LuaTools | '
utils.report        = input.report

input.defaultlibs   = { -- not all are needed
    'l-string.lua', 'l-table.lua', 'l-boolean.lua', 'l-number.lua', 'l-unicode.lua',
    'l-md5.lua', 'l-os.lua', 'l-io.lua', 'l-file.lua', 'l-dir.lua', 'l-utils.lua', 'l-tex.lua',
    'luat-lib.lua', 'luat-inp.lua', 'luat-tmp.lua', 'luat-zip.lua', 'luat-tex.lua'
}

-- todo: use environment.argument() instead of environment.arguments[]

instance.engine     =     environment.arguments["engine"]   or 'luatex'
instance.progname   =     environment.arguments["progname"] or 'context'
instance.luaname    =     environment.arguments["luafile"]  or "" -- environment.ownname or ""
instance.lualibs    =     environment.arguments["lualibs"]  or table.concat(input.defaultlibs,",")
instance.allresults =     environment.arguments["all"]      or false
instance.pattern    =     environment.arguments["pattern"]  or nil
instance.sortdata   =     environment.arguments["sort"]     or false
instance.kpseonly   = not environment.arguments["all"]      or false
instance.my_format  =     environment.arguments["format"]   or instance.format
instance.lsrmode    =     environment.arguments["lsr"]      or false

if type(instance.pattern) == 'boolean' then
    input.report("invalid pattern specification") -- toto, force verbose for one message
    instance.pattern = nil
end

if environment.arguments["trace"] then input.settrace(environment.arguments["trace"]) end

if environment.arguments["minimize"] then
    if input.validators.visibility[instance.progname] then
        instance.validfile = input.validators.visibility[instance.progname]
    end
end

function input.my_prepare_a(instance)
    input.identify_cnf(instance)
    input.load_cnf(instance)
    input.expand_variables(instance)
end

function input.my_prepare_b(instance)
    input.my_prepare_a(instance)
    input.load_hash(instance)
    input.automount(instance)
end

-- barename

if not messages then messages = { } end

messages.no_ini_file = [[
There is no lua initialization file found. This file can be forced by the
"--progname" directive, or specified with "--luaname", or it is derived
automatically from the formatname (aka jobname). It may be that you have
to regenerate the file database using "luatools --generate".
]]

messages.help = [[
--generate        generate file database
--variables       show configuration variables
--expansions      show expanded variables
--configurations  show configuration order
--expand-braces   expand complex variable
--expand-path     expand variable (resolve paths)
--expand-var      expand variable (resolve references)
--show-path       show path expansion of ...
--var-value       report value of variable
--find-file       report file location
--find-path       report path of file
--make or --ini   make luatex format
--run or --fmt=   run luatex format
--luafile=str     lua inifile (default is <progname>.lua)
--lualibs=list    libraries to assemble (optional when --compile)
--compile         assemble and compile lua inifile
--mkii            force context mkii mode (only for testing, not usable!)
--verbose         give a bit more info
--minimize        optimize lists for format
--all             show all found files
--sort            sort cached data
--engine=str      target engine
--progname=str    format or backend
--pattern=str     filter variables
--lsr             use lsr and cnf directly
]]

function input.my_make_format(instance,texname)
    if texname and texname ~= "" then
        if input.usecache then
            local path = file.join(caches.setpath(instance,"formats")) -- maybe platform
            if path and lfs then
                lfs.chdir(path)
            end
        end
        local barename = texname:gsub("%.%a+$","")
        if barename == texname then
            texname = texname .. ".tex"
        end
        local fullname = input.find_files(instance,texname)[1] or ""
        if fullname == "" then
            input.report("no tex file with name",texname)
        else
            local luaname, lucname, luapath, lualibs = "", "", "", { }
            -- the following is optional, since context.lua can also
            -- handle this collect and compile business
            if environment.arguments["compile"] then
                if luaname == "" then luaname = barename end
                input.report("creating initialization file " .. luaname)
                luapath = file.dirname(luaname)
                if luapath == "" then
                    luapath = file.dirname(texname)
                end
                if luapath == "" then
                    luapath = file.dirname(input.find_files(instance,texname)[1] or "")
                end
                lualibs = string.split(instance.lualibs,",")
                luaname = file.basename(barename .. ".lua")
                lucname = file.basename(barename .. ".luc")
                -- todo: when this fails, we can just copy the merged libraries from
                -- luatools since they are normally the same, at least for context
                if lualibs[1] then
                    local firstlib = file.join(luapath,lualibs[1])
                    if not lfs.isfile(firstlib) then
                        local foundname = input.find_files(instance,lualibs[1])[1]
                        if foundname then
                            input.report("located library path : " .. luapath)
                            luapath = file.dirname(foundname)
                        end
                    end
                end
                input.report("using library path : " .. luapath)
                input.report("using lua libraries: " .. table.join(lualibs," "))
                utils.merger.selfcreate(lualibs,luapath,luaname)
                if utils.lua.compile(luaname, lucname) and io.exists(lucname) then
                    luaname = lucname
                    input.report("using compiled initialization file " .. lucname)
                else
                    input.report("using uncompiled initialization file " .. luaname)
                end
            else
                for _, v in pairs({instance.luaname, instance.progname, barename}) do
                    v = string.gsub(v..".lua","%.lua%.lua$",".lua")
                    if v and (v ~= "") then
                        luaname = input.find_files(instance,v)[1] or ""
                        if luaname ~= "" then
                            break
                        end
                    end
                end
            end
            if luaname == "" then
                input.reportlines(messages.no_ini_file)
                input.report("texname  : " .. texname)
                input.report("luaname  : " .. instance.luaname)
                input.report("progname : " .. instance.progname)
                input.report("barename : " .. barename)
            else
                input.report("using lua initialization file " .. luaname)
                local flags = { "--ini" }
                if environment.arguments["mkii"] then
                --  flags[#flags+1] = "--mkii" -- web2c error
                    flags[#flags+1] = "--progname=" .. instance.progname
                else
                    flags[#flags+1] = "--lua=" .. string.quote(luaname)
                --  flags[#flags+1] = "--progname=" .. instance.progname -- potential fallback
                end
                local command = "luatex ".. table.concat(flags," ")  .. " " .. string.quote(fullname) .. " \\dump"
                input.report("running command: " .. command .. "\n")
                os.exec(command)
            end
        end
    else
        input.report("no tex file given")
    end
end

function input.my_run_format(instance,name,data)
 -- hm, rather old code here; we can now use the file.whatever functions
    if name and (name ~= "") then
        local barename = name:gsub("%.%a+$","")
        local fmtname = ""
        if input.usecache then
            local path = file.join(caches.setpath(instance,"formats")) -- maybe platform
            fmtname = file.join(path,barename..".fmt") or ""
        end
        if fmtname == "" then
            fmtname = input.find_files(instance,barename..".fmt")[1] or ""
        end
        fmtname = input.clean_path(fmtname)
        barename = fmtname:gsub("%.%a+$","")
        if fmtname == "" then
            input.report("no format with name",name)
        else
            local luaname = barename .. ".luc"
            local f = io.open(luaname)
            if not f then
                luaname = barename .. ".lua"
                f = io.open(luaname)
            end
            if f then
                f:close()
                -- bug, no .fmt !
                local command = "luatex --fmt=" .. string.quote(barename) .. " --lua=" .. string.quote(luaname) .. " " .. string.quote(data)
                input.report("running command: " .. command)
                os.exec(command)
            else
                input.report("using format name",fmtname)
                input.report("no luc/lua with name",barename)
            end
        end
    end
end

input.report(banner,"\n")

local ok = true

if environment.arguments["find-file"] then
    input.my_prepare_b(instance)
    instance.format  = environment.arguments["format"] or instance.format
    if instance.pattern then
        instance.allresults = true
        input.for_files(instance, input.find_files, { instance.pattern }, instance.my_format)
    else
        input.for_files(instance, input.find_files, environment.files, instance.my_format)
    end
elseif environment.arguments["find-path"] then
    input.my_prepare_b(instance)
    local path = input.find_file(instance, environment.files[1], instance.my_format)
    if input.verbose then
        input.report(file.dirname(path))
    else
        print(file.dirname(path))
    end
--~ elseif environment.arguments["first-writable-path"] then
--~     input.my_prepare_b(instance)
--~     input.report(input.first_writable_path(instance,environment.files[1] or "."))
elseif environment.arguments["run"] then
    input.my_prepare_a(instance) -- ! no need for loading databases
    input.verbose = true
    input.my_run_format(instance,environment.files[1] or "",environment.files[2] or "")
elseif environment.arguments["fmt"] then
    input.my_prepare_a(instance) -- ! no need for loading databases
    input.verbose = true
    input.my_run_format(instance,environment.arguments["fmt"], environment.files[1] or "")
elseif environment.arguments["expand-braces"] then
    input.my_prepare_a(instance)
    input.for_files(instance, input.expand_braces, environment.files)
elseif environment.arguments["expand-path"] then
    input.my_prepare_a(instance)
    input.for_files(instance, input.expand_path, environment.files)
elseif environment.arguments["expand-var"] or environment.arguments["expand-variable"] then
    input.my_prepare_a(instance)
    input.for_files(instance, input.expand_var, environment.files)
elseif environment.arguments["show-path"] or environment.arguments["path-value"] then
    input.my_prepare_a(instance)
    input.for_files(instance, input.show_path, environment.files)
elseif environment.arguments["var-value"] or environment.arguments["show-value"] then
    input.my_prepare_a(instance)
    input.for_files(instance, input.var_value, environment.files)
elseif environment.arguments["format-path"] then
    input.my_prepare_b(instance)
    input.report(caches.setpath(instance,"format"))
elseif instance.pattern then -- brrr
    input.my_prepare_b(instance)
    instance.format = environment.arguments["format"] or instance.format
    instance.allresults = true
    input.for_files(instance, input.find_files, { instance.pattern }, instance.my_format)
elseif environment.arguments["generate"] then
    instance.renewcache = true
    input.verbose = true
    input.my_prepare_b(instance)
elseif environment.arguments["make"] or environment.arguments["ini"] or environment.arguments["compile"] then
    input.my_prepare_b(instance)
    input.verbose = true
    input.my_make_format(instance,environment.files[1] or "")
elseif environment.arguments["selfmerge"] then
    utils.merger.selfmerge(own.name,own.libs,own.list)
elseif environment.arguments["selfclean"] then
    utils.merger.selfclean(own.name)
elseif environment.arguments["selfupdate"] then
    input.my_prepare_b(instance)
    input.verbose = true
    input.update_script(instance,own.name,"luatools")
elseif environment.arguments["variables"] or environment.arguments["show-variables"] then
    input.my_prepare_a(instance)
    input.list_variables(instance)
elseif environment.arguments["expansions"] or environment.arguments["show-expansions"] then
    input.my_prepare_a(instance)
    input.list_expansions(instance)
elseif environment.arguments["configurations"] or environment.arguments["show-configurations"] then
    input.my_prepare_a(instance)
    input.list_configurations(instance)
elseif environment.arguments["help"] or (environment.files[1]=='help') or (#environment.files==0) then
    if not input.verbose then
        input.verbose = true
        input.report(banner,"\n")
    end
    input.reportlines(messages.help)
else
    input.my_prepare_b(instance)
    input.for_files(instance, input.find_files, environment.files, instance.my_format)
end

if input.verbose then
    input.report("")
    input.report("runtime: " .. os.clock() .. " seconds")
end

--~ if ok then
--~     input.report("exit code: 0") os.exit(0)
--~ else
--~     input.report("exit code: 1") os.exit(1)
--~ end

if environment.platform == "unix" then
    io.write("\n")
end
