printing/cups_config_helper.py

#!/usr/bin/env python
# Copyright (c) 2011 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""cups-config wrapper.

cups-config, at least on Ubuntu Lucid and Natty, dumps all
cflags/ldflags/libs when passed the --libs argument.  gyp would like
to keep these separate: cflags are only needed when compiling files
that use cups directly, while libs are only needed on the final link
line.

TODO(evan): remove me once
  https://bugs.launchpad.net/ubuntu/+source/cupsys/+bug/163704
is fixed.
"""

import subprocess
import sys

def usage():
  print 'usage: %s {--cflags|--ldflags|--libs}' % sys.argv[0]


def run_cups_config(mode):
  """Run cups-config with all --cflags etc modes, parse out the mode we want,
  and return those flags as a list."""

  cups = subprocess.Popen(['cups-config', '--cflags', '--ldflags', '--libs'],
                          stdout=subprocess.PIPE)
  flags = cups.communicate()[0].strip()

  flags_subset = []
  for flag in flags.split():
    flag_mode = None
    if flag.startswith('-l'):
      flag_mode = '--libs'
    elif (flag.startswith('-L') or flag.startswith('-Wl,')):
      flag_mode = '--ldflags'
    elif (flag.startswith('-I') or flag.startswith('-D')):
      flag_mode = '--cflags'

    # Be conservative: for flags where we don't know which mode they
    # belong in, always include them.
    if flag_mode is None or flag_mode == mode:
      flags_subset.append(flag)

  return flags_subset


def main():
  if len(sys.argv) != 2:
    usage()
    return 1

  mode = sys.argv[1]
  if mode not in ('--cflags', '--libs', '--ldflags'):
    usage()
    return 1
  flags = run_cups_config(mode)
  print ' '.join(flags)
  return 0


if __name__ == '__main__':
  sys.exit(main())