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Text File  |  1996-03-18  |  1.6 KB  |  72 lines  |  [TEXT/Pyth]
  1. # Extract files from a SHAR archive.
  2. # Run this on the Mac.
  3. # Usage:
  4. # >>> import unshar
  5. # >>> f = open('SHAR')
  6. # >>> unshar.unshar(f)
  7.  
  8. import string
  9.  
  10. def unshar(fp, verbose=0, overwrite=0):
  11.     ofp = None
  12.     file = None
  13.     while 1:
  14.         line = fp.readline()
  15.         if verbose > 3: print 'Got:', `line`
  16.         if line[:1] == 'X':
  17.             # Most common case first
  18.             if ofp: ofp.write(line[1:])
  19.             continue
  20.         if not line:
  21.             if verbose: print 'EOF'
  22.             if ofp:
  23.                 print 'Unterminated file -- closing'
  24.                 ofp.close()
  25.                 ofp = None
  26.             break
  27.         if line[0] == '#':
  28.             if verbose: print line,
  29.             continue
  30.         if line[:14] == 'sed "s/^X//" >':
  31.             if verbose: print "!!!", `line`
  32.             i = string.find(line, "'")
  33.             j = string.find(line, "'", i+1)
  34.             if i >= 0 and j > i:
  35.                 file = line[i+1:j]
  36.                 if '/' in file:
  37.                     words = string.splitfields(file, '/')
  38.                     for funny in '', '.':
  39.                         while funny in words: words.remove(funny)
  40.                     for i in range(len(words)):
  41.                         if words[i] == '..': words[i] = ''
  42.                     words.insert(0, '')
  43.                     file = string.joinfields(words, ':')
  44.                 try:
  45.                     ofp = open(file, 'r')
  46.                     ofp.close()
  47.                     ofp = None
  48.                     over = 1
  49.                 except IOError:
  50.                     over = 0
  51.                 if over and not overwrite:
  52.                     print 'Skipping', file, '(already exists) ...'
  53.                     continue
  54.                 ofp = open(file, 'w')
  55.                 if over:
  56.                     print 'Overwriting', file, '...'
  57.                 else:
  58.                     print 'Writing', file, '...'
  59.             continue
  60.         if line == 'END_OF_FILE\n':
  61.             if not file:
  62.                 print 'Unexpected END_OF_FILE marker'
  63.             if ofp:
  64.                 print 'done'
  65.                 ofp.close()
  66.                 ofp = None
  67.             else:
  68.                 print 'done skipping'
  69.             file = None
  70.             continue
  71.         if verbose: print "...", `line`
  72.