Lib/plat-irix5/cdplayer.py

   1 # This file implements a class which forms an interface to the .cdplayerrc
   2 # file that is maintained by SGI's cdplayer program.
   3 #
   4 # Usage is as follows:
   5 #
   6 # import readcd
   7 # r = readcd.Readcd()
   8 # c = Cdplayer(r.gettrackinfo())
   9 #
  10 # Now you can use c.artist, c.title and c.track[trackno] (where trackno
  11 # starts at 1).  When the CD is not recognized, all values will be the empty
  12 # string.
  13 # It is also possible to set the above mentioned variables to new values.
  14 # You can then use c.write() to write out the changed values to the
  15 # .cdplayerrc file.
  16
  17 cdplayerrc = '.cdplayerrc'
  18
  19 class Cdplayer:
  20         def __init__(self, tracklist):
  21                 import string
  22                 self.artist = ''
  23                 self.title = ''
  24                 if type(tracklist) == type(''):
  25                         t = []
  26                         for i in range(2, len(tracklist), 4):
  27                                 t.append((None, \
  28                                           (string.atoi(tracklist[i:i+2]), \
  29                                            string.atoi(tracklist[i+2:i+4]))))
  30                         tracklist = t
  31                 self.track = [None] + [''] * len(tracklist)
  32                 self.id = 'd' + string.zfill(len(tracklist), 2)
  33                 for track in tracklist:
  34                         start, length = track
  35                         self.id = self.id + string.zfill(length[0], 2) + \
  36                                   string.zfill(length[1], 2)
  37                 try:
  38                         import posix
  39                         f = open(posix.environ['HOME'] + '/' + cdplayerrc, 'r')
  40                 except IOError:
  41                         return
  42                 import re
  43                 reg = re.compile(r'^([^:]*):\t(.*)')
  44                 s = self.id + '.'
  45                 l = len(s)
  46                 while 1:
  47                         line = f.readline()
  48                         if line == '':
  49                                 break
  50                         if line[:l] == s:
  51                                 line = line[l:]
  52                                 match = reg.match(line)
  53                                 if not match:
  54                                         print 'syntax error in ~/' + cdplayerrc
  55                                         continue
  56                                 name, value = match.group(1, 2)
  57                                 if name == 'title':
  58                                         self.title = value
  59                                 elif name == 'artist':
  60                                         self.artist = value
  61                                 elif name[:5] == 'track':
  62                                         trackno = string.atoi(name[6:])
  63                                         self.track[trackno] = value
  64                 f.close()
  65
  66         def write(self):
  67                 import posix
  68                 filename = posix.environ['HOME'] + '/' + cdplayerrc
  69                 try:
  70                         old = open(filename, 'r')
  71                 except IOError:
  72                         old = open('/dev/null', 'r')
  73                 new = open(filename + '.new', 'w')
  74                 s = self.id + '.'
  75                 l = len(s)
  76                 while 1:
  77                         line = old.readline()
  78                         if line == '':
  79                                 break
  80                         if line[:l] != s:
  81                                 new.write(line)
  82                 new.write(self.id + '.title:\t' + self.title + '\n')
  83                 new.write(self.id + '.artist:\t' + self.artist + '\n')
  84                 for i in range(1, len(self.track)):
  85                         new.write(self.id + '.track.' + `i` + ':\t' + \
  86                                   self.track[i] + '\n')
  87                 old.close()
  88                 new.close()
  89                 posix.rename(filename + '.new', filename)