#!/usr/bin/python

import re, sys, os
if len(sys.argv) < 2:
	print "No filename given"
	sys.exit(1)
fInName=sys.argv[1]
fOutName=re.compile("\.ly$").sub(".conv.ly",fInName)
print fOutName
reStaff=re.compile("Staff")
rePianoStart=re.compile("\\context PianoStaff = \".*?\"")
reVoiceStart=re.compile("\\context Voice = \".*?\"")
try: 
	print "Opening file: "+fInName
	fOut=open(fOutName,'w')
	print "Converting file..."
	for line in open(fInName):
		line=reStaff.sub("PianoStaff",line)
		mo=rePianoStart.search(line)
		if mo:
			end=mo.end()
			line=line[:end]+" \\autochange "+line[end+1:]
		mo=reVoiceStart.search(line)
		if mo:
			end=mo.end()
			line=line[:end]+" \\autochange "+line[end+1:]
		fOut.write(line)
	fOut.close()
	print "Running lilypond on converted file: "+fOutName+" ..."
	lilyOutName=re.compile("\.ly$").sub("",fOutName)
	os.system("lilypond -o \""+ lilyOutName+"\" \""+fOutName+"\"")
	# comment out the next 2 lines if you want the intermediate files to be left in place.
	print "Cleaning up..."
	os.system("rm "+lilyOutName+".ly "+lilyOutName+".ps") 
	print "\nDone."
except IOError,err:
	import errno
	if err.errno != errno.ENOENT: raise
	else:
		print "Can't open file: " + fInName
		sys.exit(2)