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#!/usr/bin/env texlua  

VERSION = "0.6"

--[[
     musixtex.lua: processes MusiXTeX files (and deletes intermediate files)

     (c) Copyright 2012 Bob Tennent rdt@cs.queensu.ca

     This program is free software; you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by the
     Free Software Foundation; either version 2 of the License, or (at your
     option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
     Public License for more details.

     You should have received a copy of the GNU General Public License along
     with this program; if not, write to the Free Software Foundation, Inc.,
     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

--]]

--[[

  ChangeLog:

     version 0.6  2012-09-14 RDT
      Add -1 (one-pass [pdf][la]tex processing) option.

     version 0.5  2011-11-28 RDT
      Add -i (retain intermediate files) option.

     version 0.4  2011-04-30 RDT
       Allow multiple filenames (and options).
       Add -f (default) and -l (latex) options.

     version 0.3  2011-04-25 RDT
       Add -d (dvipdfm)  and -s (stop at dvi) options.

     version 0.2  2011-04-21 RDT
       Allow basename.tex as filename.
       Add -p option for pdfetex processing.
       Add standard -v -h options.

--]]

function usage()
  print("Usage:  [texlua] musixtex.lua { option | basename[.tex] } ... ")
  print("options: -v  version")
  print("         -h  help")
  print("         -l  latex (or pdflatex)")
  print("         -p  pdfetex (or pdflatex)")
  print("         -d  dvipdfm")
  print("         -s  stop at dvi")
  print("         -i  retain intermediate files")
  print("         -1  one-pass [pdf][la]tex processing")
  print("         -f  restore default processing")
end

function whoami ()
  print("This is musixtex.lua version ".. VERSION .. ".")
end

whoami()
if #arg == 0 then
  usage()
  os.exit(0)
end

-- defaults:
tex = "etex"  
musixflx = "musixflx"
dvi = "dvips"
ps2pdf = "ps2pdf"
intermediate = 1
passes = 2

exit_code = 0
narg = 1
repeat
  this_arg = arg[narg]
  if this_arg == "-v" then
    os.exit(0)
  elseif this_arg == "-h" then
    usage()
    os.exit(0)
  elseif this_arg == "-l" then
    if tex == "pdfetex" then
      tex = "pdflatex"
    else
      tex = "latex"
    end
  elseif this_arg == "-p" then
    if tex == "latex" then
      tex = "pdflatex"
    else
      tex = "pdfetex"
    end
    dvi = ""; ps2pdf = ""
  elseif this_arg == "-d" then
    dvi = "dvipdfm"; ps2pdf = ""
  elseif this_arg == "-s" then
    dvi = ""; ps2pdf = ""
  elseif this_arg == "-i" then
    intermediate = 0
  elseif this_arg == "-1" then
    passes = 1
  elseif this_arg == "-f" then
    tex = "etex"; dvi = "dvips"; ps2pdf = "ps2pdf"; intermediate = 1; passes = 2
  else
    filename = this_arg 
    if filename ~= "" and string.sub(filename, -4, -1) == ".tex" then
        filename = string.sub(filename, 1, -5)
    end
    if not io.open(filename .. ".tex", "r") then
      print("Non-existent file: ", filename .. ".tex")
    else
      print("Processing ".. filename .. ".tex.")
      os.remove( filename .. ".mx2" )
      if (passes == 1 or os.execute(tex .. " " .. filename) == 0) and
         (passes == 1 or os.execute(musixflx .. " " .. filename) == 0) and
         (os.execute(tex .. " " .. filename) == 0) and
         ((tex ~= "latex" and tex ~= "pdflatex") 
           or (os.execute(tex .. " " .. filename) == 0)) and
         (dvi == "" or  (os.execute(dvi .. " " .. filename) == 0)) and
         (ps2pdf == "" or (os.execute(ps2pdf .. " " .. filename .. ".ps") == 0) )
      then 
        if ps2pdf ~= "" then 
          print(filename .. ".pdf generated by " .. ps2pdf .. ".")
        end
        if intermediate == 1 then -- clean-up:
          os.remove( filename .. ".mx1" )
          os.remove( filename .. ".mx2" )
          if dvi ~= "" then
            os.remove( filename .. ".dvi" )
          end
          if ps2pdf ~= "" then 
            os.remove( filename .. ".ps" )
          end
        end
      else
        print("Musixtex processing of " .. filename .. ".tex fails.\n")
        exit_code = 2
        --[[ uncomment for debugging
        print("tex = ", tex)
        print("dvi = ", dvi)
        print("ps2pdf = ", ps2pdf)
        --]]
      end

    end --if not io.open ...
  end --if this_arg == ...
  narg = narg+1
until narg > #arg 
os.exit( exit_code )