printing/cups_config_helper.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """cups-config wrapper.
   7
   8 cups-config, at least on Ubuntu Lucid and Natty, dumps all
   9 cflags/ldflags/libs when passed the --libs argument.  gyp would like
  10 to keep these separate: cflags are only needed when compiling files
  11 that use cups directly, while libs are only needed on the final link
  12 line.
  13
  14 TODO(evan): remove me once
  15   https://bugs.launchpad.net/ubuntu/+source/cupsys/+bug/163704
  16 is fixed.
  17 """
  18
  19 import subprocess
  20 import sys
  21
  22 def usage():
  23   print 'usage: %s {--cflags|--ldflags|--libs}' % sys.argv[0]
  24
  25
  26 def run_cups_config(mode):
  27   """Run cups-config with all --cflags etc modes, parse out the mode we want,
  28   and return those flags as a list."""
  29
  30   cups = subprocess.Popen(['cups-config', '--cflags', '--ldflags', '--libs'],
  31                           stdout=subprocess.PIPE)
  32   flags = cups.communicate()[0].strip()
  33
  34   flags_subset = []
  35   for flag in flags.split():
  36     flag_mode = None
  37     if flag.startswith('-l'):
  38       flag_mode = '--libs'
  39     elif (flag.startswith('-L') or flag.startswith('-Wl,')):
  40       flag_mode = '--ldflags'
  41     elif (flag.startswith('-I') or flag.startswith('-D')):
  42       flag_mode = '--cflags'
  43
  44     # Be conservative: for flags where we don't know which mode they
  45     # belong in, always include them.
  46     if flag_mode is None or flag_mode == mode:
  47       flags_subset.append(flag)
  48
  49   return flags_subset
  50
  51
  52 def main():
  53   if len(sys.argv) != 2:
  54     usage()
  55     return 1
  56
  57   mode = sys.argv[1]
  58   if mode not in ('--cflags', '--libs', '--ldflags'):
  59     usage()
  60     return 1
  61   flags = run_cups_config(mode)
  62   print ' '.join(flags)
  63   return 0
  64
  65
  66 if __name__ == '__main__':
  67   sys.exit(main())