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#!/usr/bin/env python
'''
NAME
music2png - Converts textual music notation to classically notated PNG file
SYNOPSIS
music2png [options] INFILE
DESCRIPTION
This filter reads LilyPond or ABC music notation text from the input file
INFILE (or stdin if INFILE is -), converts it to classical music notation
and writes it to a trimmed PNG image file.
This script is a wrapper for LilyPond and ImageMagick commands.
OPTIONS
-f FORMAT
The INFILE music format. 'abc' for ABC notation, 'ly' for LilyPond
notation. Defaults to 'abc' unless source starts with backslash.
-o OUTFILE
The file name of the output file. If not specified the output file is
named like INFILE but with a .png file name extension.
-m
Skip if the PNG output file is newer that than the INFILE.
Compares timestamps on INFILE and OUTFILE. If
INFILE is - (stdin) then compares MD5 checksum stored in file
named like OUTFILE but with a .md5 file name extension.
The .md5 file is created if the -m option is used and the
INFILE is - (stdin).
-v
Verbosely print processing information to stderr.
--help, -h
Print this documentation.
--version
Print program version number.
SEE ALSO
lilypond(1), abc2ly(1), convert(1)
AUTHOR
Written by Stuart Rackham, <srackham@gmail.com>
COPYING
Copyright (C) 2006 Stuart Rackham. Free use of this software is
granted under the terms of the GNU General Public License (GPL).
'''
# Suppress warning: "the md5 module is deprecated; use hashlib instead"
import warnings
warnings.simplefilter('ignore',DeprecationWarning)
import os, sys, tempfile, md5
VERSION = '0.1.2'
# Globals.
verbose = False
class EApp(Exception): pass # Application specific exception.
def print_stderr(line):
sys.stderr.write(line + os.linesep)
def print_verbose(line):
if verbose:
print_stderr(line)
def write_file(filename, data, mode='w'):
f = open(filename, mode)
try:
f.write(data)
finally:
f.close()
def read_file(filename, mode='r'):
f = open(filename, mode)
try:
return f.read()
finally:
f.close()
def run(cmd):
global verbose
if not verbose:
cmd += ' 2>%s' % os.devnull
print_verbose('executing: %s' % cmd)
if os.system(cmd):
raise EApp, 'failed command: %s' % cmd
def music2png(format, infile, outfile, modified):
'''Convert ABC notation in file infile to cropped PNG file named outfile.'''
outfile = os.path.abspath(outfile)
outdir = os.path.dirname(outfile)
if not os.path.isdir(outdir):
raise EApp, 'directory does not exist: %s' % outdir
basefile = tempfile.mktemp(dir=os.path.dirname(outfile))
temps = [basefile + ext for ext in ('.abc', '.ly', '.ps', '.midi')]
skip = False
if infile == '-':
source = sys.stdin.read()
checksum = md5.new(source).digest()
filename = os.path.splitext(outfile)[0] + '.md5'
if modified:
if os.path.isfile(filename) and os.path.isfile(outfile) and \
checksum == read_file(filename,'rb'):
skip = True
else:
write_file(filename, checksum, 'wb')
else:
if not os.path.isfile(infile):
raise EApp, 'input file does not exist: %s' % infile
if modified and os.path.isfile(outfile) and \
os.path.getmtime(infile) <= os.path.getmtime(outfile):
skip = True
source = read_file(infile)
if skip:
print_verbose('skipped: no change: %s' % outfile)
return
if format is None:
if source and source.startswith('\\'): # Guess input format.
format = 'ly'
else:
format = 'abc'
# Write temporary source file.
write_file('%s.%s' % (basefile,format), source)
abc = basefile + '.abc'
ly = basefile + '.ly'
png = basefile + '.png'
saved_pwd = os.getcwd()
os.chdir(outdir)
try:
if format == 'abc':
run('abc2ly -o "%s" "%s"' % (ly,abc))
run('lilypond --png -o "%s" "%s"' % (basefile,ly))
os.rename(png, outfile)
finally:
os.chdir(saved_pwd)
# Chop the bottom 75 pixels off to get rid of the page footer then crop the
# music image. The -strip option necessary because FOP does not like the
# custom PNG color profile used by Lilypond.
run('convert "%s" -strip -gravity South -chop 0x75 -trim "%s"' % (outfile, outfile))
for f in temps:
if os.path.isfile(f):
print_verbose('deleting: %s' % f)
os.remove(f)
def usage(msg=''):
if msg:
print_stderr(msg)
print_stderr('\n'
'usage:\n'
' music2png [options] INFILE\n'
'\n'
'options:\n'
' -f FORMAT\n'
' -o OUTFILE\n'
' -m\n'
' -v\n'
' --help\n'
' --version')
def main():
# Process command line options.
global verbose
format = None
outfile = None
modified = False
import getopt
opts,args = getopt.getopt(sys.argv[1:], 'f:o:mhv', ['help','version'])
for o,v in opts:
if o in ('--help','-h'):
print __doc__
sys.exit(0)
if o =='--version':
print('music2png version %s' % (VERSION,))
sys.exit(0)
if o == '-f': format = v
if o == '-o': outfile = v
if o == '-m': modified = True
if o == '-v': verbose = True
if len(args) != 1:
usage()
sys.exit(1)
infile = args[0]
if format not in (None, 'abc', 'ly'):
usage('invalid FORMAT')
sys.exit(1)
if outfile is None:
if infile == '-':
usage('OUTFILE must be specified')
sys.exit(1)
outfile = os.path.splitext(infile)[0] + '.png'
# Do the work.
music2png(format, infile, outfile, modified)
# Print something to suppress asciidoc 'no output from filter' warnings.
if infile == '-':
sys.stdout.write(' ')
if __name__ == "__main__":
try:
main()
except SystemExit:
raise
except KeyboardInterrupt:
sys.exit(1)
except Exception, e:
print_stderr("%s: %s" % (os.path.basename(sys.argv[0]), str(e)))
sys.exit(1)
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