LaTeX format for LuaMetaTeX
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local format = os.selfname -- or os.selfcore, I couldn't find a difference yet
local ourname = arg[0] -- This might not be os.selfarg[0]
-- We want to drop arg[0] aka. ourname from the arguments to avoid recursion
if os.selfarg[0] == ourname then
ourname = nil
end
local run
local arg_pattern, late_arg_pattern do
local l = lpeg or require'lpeg'
-- We intepret two arguments directly
local early_args = 'run' * l.Cmt(l.P'=' + -1, function() run = true return true end)
+ 'progname=' * l.Cmt(0, function(s, off) format = s:sub(off) return true end)
-- LuaMetaTeX needs -- to introduce parameters,
-- but fmtutil uses just -. Let's rewrite this on the fly:
local maybe_option = ('-' * ('-' + l.Cc'-') * #(early_args^-1))^-1
local quote = l.Cc(os.type == 'windows' and '"' or "'")
local escape
if os.type == 'windows' then
-- Windows: " -> "^"" The ^ is for cmd escaping, the """ is for command line splitting escaping,
-- backslashes still have to be escaped, but only in front of " or \
-- Additionally, "%" always as to be escaped for some variable substitution
-- pass before everything else.
-- WARNING: This works with luametatex's argument splitting, but don't generally rely
-- on it for other Windows programs. There are two standard Windows ways which are incompatible...
escape = '\\' * #l.S'\\"' * l.Cc'\\' + '"' * l.Cc'^""' + '%' * l.Cc'%' + 1
else
-- POSIX: We escape with single quotes, so only single quotes need escaping
escape = "'" * l.Cc"\\''" + 1
end
arg_pattern = l.Cs(l.Cc' ' * maybe_option * quote * escape^0 * quote)
late_arg_pattern = l.Cs(l.Cc' ' * quote * escape^0 * quote)
end
for i, a in ipairs(os.selfarg) do
if a == ourname then -- Avoid recursion
table.remove(os.selfarg, i)
ourname = nil
a = os.selfarg[i]
end
if a == "--" then arg_pattern = late_arg_pattern end -- This convention is not respected by luametatex itself
os.selfarg[i] = arg_pattern:match(a)
end
os.setenv("engine", status.luatex_engine)
local kpse_call = io.popen(string.format("kpsewhich -progname%s -format lua -all -must-exist%s-init.lua", late_arg_pattern:match(format), late_arg_pattern:match(format)))
local file
repeat
file = kpse_call:read()
until not assert(file, "Unable to find initialization script. Aborting."):match('^%.')
if not kpse_call:close() then
error(file)
end
local geterrorcode
if os.type == 'windows' then
function geterrorcode(ec) return ec end
else
function geterrorcode(ec) return ec & 0xFF == 0 and ec >> 8 or 0xFF end
end
local firstargs = string.format("luametatex --permitloadlib%s%s", late_arg_pattern:match('--lua=' .. file), late_arg_pattern:match('--arg0=' .. os.selfarg[0]))
local args = table.concat(os.selfarg)
if run then -- The user wants to take care of everything
os.exit(geterrorcode(os.execute(firstargs .. args)))
else
for i = 1, 5 do
local status = geterrorcode(os.execute(string.format("%s --run=%i%s", firstargs, i, args)))
if status ~= 75 then
os.exit(status)
end
end
os.exit(75)
end