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
   8 from flac_archive.tags import Tags
   9
  10 class SubprocessError(Exception):
  11     def __init__(self, status, command=None, stderr=None):
  12         if command is None:
  13             command_msg = None
  14         else:
  15             command_msg = ': ' + ' '.join(command)
  16         if status < 0:
  17             msg = 'exited due to signal %d%s'
  18         else:
  19             msg = 'exit status %d%s'
  20         Exception.__init__(self, msg % (abs(status), command_msg))
  21         self.status = status
  22         self.command = command
  23         self.stderr = stderr
  24
  25 def get_tags(fn):
  26     tags = Tags()
  27
  28     command = ['metaflac', '--no-utf8-convert', '--export-tags-to=-', fn]
  29     p = subprocess.Popen(command, stdout=subprocess.PIPE,
  30                          stderr=subprocess.STDOUT)
  31     tags.load(p.stdout)
  32
  33     status = p.wait()
  34     if status != 0:
  35         raise SubprocessError(status, command=command, stderr=p.stdout)
  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 = subprocess.Popen(command, stdout=subprocess.PIPE,
  45                          stderr=subprocess.STDOUT)
  46     stdout, stderr = p.communicate()
  47     status = p.wait()
  48     if status != 0:
  49         raise SubprocessError(status, command=command, stderr=stdout)
  50
  51 def do_read(filenames):
  52     # Use this mapping of tag names to sets of tag values to detect global tags.
  53     all_tags = {}
  54     # Build the collated result in this Tags object.
  55     coll_tags = Tags()
  56     # XXX The Tags interface is horrible.  It's gotta be almost 10 years since
  57     # I wrote it, so not surprising...
  58     for fn in filenames:
  59         tags = get_tags(fn)
  60         track_tags = tags.get('TRACKNUMBER')
  61         # this check belongs in Tags
  62         if len(track_tags) != 1:
  63             sys.stderr.write('bogus TRACKNUMBER %s: %s\n' % (track_tags, fn))
  64             return 3
  65         track = int(track_tags[0])
  66         for tag, values in tags._global.iteritems():
  67             # Makes no sense to save TRACKNUMBER in coll_tags.
  68             if tag == 'TRACKNUMBER':
  69                 continue
  70             for value in values:
  71                 if tag in all_tags:
  72                     all_tags[tag].add(value)
  73                 else:
  74                     all_tags[tag] = set([value])
  75                 coll_tags.set(tag, value, track)
  76     for tag, values in all_tags.iteritems():
  77         if len(values) == 1:
  78             # Only one value for this tag, so add it to global tags.
  79             coll_tags.set(tag, list(values)[0])
  80             # And now remove it from each track tags.
  81             for track, tags in coll_tags._tracks.iteritems():
  82                 del tags[tag]
  83     print '\n'.join(coll_tags.all())
  84     return 0
  85
  86 def do_write(args):
  87     tags = Tags()
  88     tags.load(open(args.pop(0)))
  89     if len(args) != len(tags):
  90         sys.stderr.write('expected %d flac files, got %d\n'
  91                          % (len(tags), len(args)))
  92         return 4
  93     artist = tags.get_path_safe('ARTIST')
  94     album = tags.get_path_safe('ALBUM')
  95     try:
  96         os.mkdir(artist)
  97     except OSError, e:
  98         if e.errno != EEXIST:
  99             raise
 100     album_path = artist + '/' + album
 101     try:
 102         os.mkdir(album_path)
 103     except OSError, e:
 104         if e.errno != EEXIST:
 105             raise
 106     for i, old_fn in enumerate(args):
 107         track = i + 1
 108         fn = '%s/%s/%s.flac' % (artist, album, tags.make_filename(track))
 109         if fn != old_fn:
 110             os.rename(old_fn, fn)
 111         tmp = tempfile.NamedTemporaryFile(delete=False)
 112         try:
 113             rewrite_track_tags(track, tags, fn, tmp)
 114         finally:
 115             try:
 116                 os.unlink(tmp.name)
 117             except:
 118                 pass
 119     return 0
 120
 121 def main(args):
 122     if len(args) < 3:
 123         return usage()
 124     if args[1] == 'read':
 125         return do_read(args[2:])
 126     if args[1] == 'write':
 127         return do_write(args[2:])
 128     return usage()
 129
 130 def usage():
 131     return 2
 132
 133 if __name__ == '__main__':
 134     sys.exit(main(sys.argv))
 135