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

-- Copyright (C) 2010 Reinhard Kotucha.
-- You may freely use, modify and/or distribute this file.

-- Replacement for ps2ps.bat.
-- 'Distill' PostScript.

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

if os.type == 'windows' then
   gs='gswin32c'
else
   gs='gs'
end


files={}
options={'-dNOPAUSE', '-dBATCH', '-dSAFER'}

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


if #files ~= 2 then
   io.stderr:write('Usage: ps2ps [options] input.ps output.ps\n')
   io.stderr:write('  e.g. ps2ps -sPAPERSIZE=a4 input.ps output.ps\n')
   os.exit(1)
end


command={gs, '-q', '-sDEVICE=pswrite'}

if os.type=='unix' then
   command[#command+1]='-sstdout=%stderr'
end

command[#command+1]='-sOutputFile='..files[2] 

for i=1, #options do
   command[#command+1]=options[i]
end

command[#command+1]=files[1]

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)