diplodocus.org Git - flac-archive/blob - rewrite-tags

   1 #! /usr/bin/python
   2
   3 import os, sys
   4 import subprocess
   5 import tempfile
   6 from errno import EEXIST
   7 from subprocess import Popen, PIPE
   8
   9 from flac_archive.tags import Tags
  10
  11 class SubprocessError(Exception):
  12     def __init__(self, status, command=None, stderr=None):
  13         if command is None:
  14             command_msg = None
  15         else:
  16             command_msg = ': ' + ' '.join(command)
  17         if status < 0:
  18             msg = 'exited due to signal %d%s'
  19         else:
  20             msg = 'exit status %d%s'
  21         Exception.__init__(self, msg % (abs(status), command_msg))
  22         self.status = status
  23         self.command = command
  24         self.stderr = stderr
  25
  26 def get_tags(fn):
  27     tags = Tags()
  28
  29     command = ['metaflac', '--no-utf8-convert', '--export-tags-to=-', fn]
  30     p = Popen(command, stdout=PIPE)
  31     tags.load(p.stdout)
  32
  33     status = p.wait()
  34     if status != 0:
  35         raise SubprocessError(status, command=command, stderr=p.stderr)
  36
  37     return tags
  38
  39 def rewrite_track_tags(track, tags, fn, tmp):
  40     tmp.write('\n'.join(tags.track(track)) + '\n')
  41     tmp.close()
  42     command = ['metaflac', '--no-utf8-convert', '--dont-use-padding',
  43                '--remove-all-tags', '--import-tags-from', tmp.name, fn]
  44     p = Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  45     stdout, stderr = p.communicate()
  46     status = p.wait()
  47     if status != 0:
  48         raise SubprocessError(status, command=command, stderr=stdout)
  49
  50 def do_read(filenames):
  51     # Use this mapping of tag names to sets of tag values to detect global tags.
  52     all_tags = {}
  53     # Build the collated result in this Tags object.
  54     coll_tags = Tags()
  55     # XXX The Tags interface is horrible.  It's gotta be almost 10 years since
  56     # I wrote it, so not surprising...
  57     for fn in filenames:
  58         tags = get_tags(fn)
  59         track_tags = tags.get('TRACKNUMBER')
  60         # this check belongs in Tags
  61         if len(track_tags) != 1:
  62             sys.stderr.write('bogus TRACKNUMBER %s: %s\n' % (track_tags, fn))
  63             return 3
  64         track = int(track_tags[0])
  65         for tag, values in tags._global.iteritems():
  66             # Makes no sense to save TRACKNUMBER in coll_tags.
  67             if tag == 'TRACKNUMBER':
  68                 continue
  69             for value in values:
  70                 if tag in all_tags:
  71                     all_tags[tag].add(value)
  72                 else:
  73                     all_tags[tag] = set([value])
  74                 coll_tags.set(tag, value, track)
  75     for tag, values in all_tags.iteritems():
  76         if len(values) == 1:
  77             # Only one value for this tag, so add it to global tags.
  78             coll_tags.set(tag, list(values)[0])
  79             # And now remove it from each track tags.
  80             for track, tags in coll_tags._tracks.iteritems():
  81                 del tags[tag]
  82     print '\n'.join(coll_tags.all())
  83     return 0
  84
  85 def do_write(args):
  86     tags = Tags()
  87     tags.load(open(args.pop(0)))
  88     if len(args) != len(tags):
  89         sys.stderr.write('expected %d flac files, got %d\n'
  90                          % (len(tags), len(args)))
  91         return 4
  92     artist = tags.get_path_safe('ARTIST')
  93     album = tags.get_path_safe('ALBUM')
  94     try:
  95         os.mkdir(artist)
  96     except OSError, e:
  97         if e.errno != EEXIST:
  98             raise
  99     album_path = artist + '/' + album
 100     try:
 101         os.mkdir(album_path)
 102     except OSError, e:
 103         if e.errno != EEXIST:
 104             raise
 105     for i, old_fn in enumerate(args):
 106         track = i + 1
 107         fn = '%s/%s/%s.flac' % (artist, album, tags.make_filename(track))
 108         if fn != old_fn:
 109             os.rename(old_fn, fn)
 110         tmp = tempfile.NamedTemporaryFile(delete=False)
 111         try:
 112             rewrite_track_tags(track, tags, fn, tmp)
 113         finally:
 114             try:
 115                 os.unlink(tmp.name)
 116             except:
 117                 pass
 118     return 0
 119
 120 def main(args):
 121     if len(args) < 3:
 122         return usage()
 123     if args[1] == 'read':
 124         return do_read(args[2:])
 125     if args[1] == 'write':
 126         return do_write(args[2:])
 127     return usage()
 128
 129 def usage():
 130     return 2
 131
 132 if __name__ == '__main__':
 133     sys.exit(main(sys.argv))
 134