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

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

-- Replacement for ps2pdf*.bat.
-- Convert PS to 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

function filename (file)
   local filename
   if string.find(file, '/') then -- UNIX path
      filename=select(1, string.gsub(file, '.*/', ''))
   elseif string.find(file, '\\') then -- Windows path
      filename=select(1, string.gsub(file, '.*\\', ''))
   else -- no path
      filename=file
   end
   return(filename)
end

function basename (file)
   local basename
   local fname
   fname=filename (file)
   basename=select(1, string.gsub(fname, '\.%a+$', ''))
   return(basename)
end

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

command={gs}
files={}
options={}

PDF_level='1.4'
if string.find(basename(arg[0]), '12') then
   PDF_level='1.2'
elseif string.find(basename(arg[0]), '13') then
   PDF_level='1.3'
elseif string.find(basename(arg[0]), '14') then
   PDF_level='1.4'
end

options[#options+1]='-dCompatibilityLevel='..PDF_level

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 == 1 then
   if string.find(files[1], '^-$') then
      outfile='-'
   elseif string.find(filename(files[1]), '\.e*ps$') then
      outfile=basename(files[1])..'.pdf'
   else
      outfile=filename(files[1])..'.pdf'
   end
else
   outfile=files[2]
end

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

other_opts={'-q', '-dSAFER', '-dNOPAUSE', '-dBATCH', '-sDEVICE=pdfwrite'}

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

command[#command+1]='-sOutputFile='..outfile

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

if #files < 1 or #files > 2 then
   io.stderr:write('Usage: ps2pdf [options] (input.[e]ps|-) [output.pdf]\n')
   os.exit(0) 
end

other_opts={'-c', '.setpdfwrite', '-f', files[1]}

for i=1, #other_opts do
   command[#command+1]=other_opts[i]
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)