#!/usr/bin/env texlua
--*-Lua-*-
-- $Id$

-- Copyright (C) 2008 Reinhard Kotucha.
-- You may freely use, modify and/or distribute this file.

-- Replacement for pdfopt.bat.
-- Linearize PDF

function fixwin (args_unix)
   if os.type == 'windows' then
      local args_win={}  -- new table
      args_win[0]=args_unix[1]
      for i=1, #args_unix do  
	 args_win[i]='"'..args_unix[i]..'"'
      end
      return args_win
   else
      return args_unix
   end
end

kpse.set_program_name('pdfopt.texlua', 'pdfopt')

TEXDIR=kpse.var_value('SELFAUTOPARENT')

if os.type == 'windows' then
   os.setenv('GS_LIB', TEXDIR..'/tlpkg/tlgs/lib;'..TEXDIR..'/tlpkg/tlgs/fonts')
   os.setenv('PATH', TEXDIR..'/tlpkg/tlgs/bin;'..os.getenv('PATH'))
   gs='gswin32c'
else
   gs='gs'
end

command={gs, '-q', '-dNODISPLAY', '-dSAFER', '-dDELAYSAFER'}

files={}

for i=1, #arg do
   if string.find(arg[i], '^-') then
      command[#command+1]=arg[i]
   else
      files[#files+1]=arg[i]
   end
end

command[#command+1]='--'
command[#command+1]='pdfopt.ps'

if #files ~= 2 then
   io.stderr:write('Usage: pdfopt [options] input.pdf output.pdf')
   os.exit(0) 
else
   for i=1, #files do
      command[#command+1]=files[i]
   end
end

command=fixwin(command)

--[[ prepend an additional hyphen to activate this code
for i=0, #command do
   print (command[i])
end
os.exit(ret)
--]]

ret=os.spawn(command)
os.exit(ret)