printing/cups_config_helper.py

   1 #!/usr/bin/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     sys.exit(1)
  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 if len(sys.argv) != 2:
  52     usage()
  53
  54 mode = sys.argv[1]
  55 if mode not in ('--cflags', '--libs', '--ldflags'):
  56     usage()
  57 flags = run_cups_config(mode)
  58 print ' '.join(flags)