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#!/usr/bin/env python
import optparse
import os
import pprint
import re
import shlex
import subprocess
import sys

root_dir = os.path.dirname(__file__)
sys.path.insert(0, os.path.join(root_dir, 'deps', 'gyp', 'pylib'))
import gyp

# parse our options
parser = optparse.OptionParser()

parser.add_option("--debug",
    action="store_true",
    dest="debug",
    help="Also build debug build")

parser.add_option("--boost",
    action="store",
    dest="boost_root",
    help="Path to boost (defaults to /usr/local)")

parser.add_option("--glfw3",
    action="store",
    dest="glfw3",
    help="Path to gflw3 (defaults to using pkg-config)")

parser.add_option("--png",
    action="store",
    dest="png",
    help="Path to png (defaults to using pkg-config)")

(options, args) = parser.parse_args()

def pkg_config(pkg):
  cmd = os.popen('pkg-config --static --libs %s' % pkg, 'r')
  libs = cmd.readline().strip()
  ret = cmd.close()
  if (ret): return None

  cmd = os.popen('pkg-config --cflags %s' % pkg, 'r')
  cflags = cmd.readline().strip()
  ret = cmd.close()
  if (ret): return None

  return (libs, cflags)

def configure_llmr(o):
  if options.boost_root:
      o['variables']['boost_root'] = options.boost_root
  else:
      o['variables']['boost_root'] = '/usr/local'
  o['target_defaults']['default_configuration'] = 'Debug' if options.debug else 'Release'

def configure_glfw3(o):
  if options.glfw3:
      libpath = os.path.join(options.glfw3,'lib')
      if os.path.exists(libpath):
          o['variables']['glfw3_libraries'] = '-L'+libpath
      o['variables']['glfw3_libraries'] += ' -lglfw3'
      incpath = os.path.join(options.glfw3,'include')
      if os.path.exists(incpath):
          o['variables']['glfw3_cflags'] = '-I'+include
  else:
      ret = pkg_config('glfw3')
      if not ret:
          sys.stderr.write('could not find glfw3 with pkg-config')
          sys.exit(-1)
      o['variables']['glfw3_libraries'] = ret[0].split()
      o['variables']['glfw3_cflags'] = ret[1].split()

def configure_png(o):
  if options.png:
      libpath = os.path.join(options.png,'lib')
      if os.path.exists(libpath):
          o['variables']['png_libraries'] = '-L'+libpath
      o['variables']['png_libraries'] += ' -lpng -lz'
      incpath = os.path.join(options.png,'include')
      if os.path.exists(incpath):
          o['variables']['png_cflags'] = '-I'+include
  else:
      ret = pkg_config('libpng')
      if not ret:
          sys.stderr.write('could not find libpng with pkg-config')
          sys.exit(-1)
      o['variables']['png_libraries'] = ret[0].split()
      o['variables']['png_cflags'] = ret[1].split()

def write(filename, data):
  filename = os.path.join(root_dir, filename)
  print "creating ", filename
  f = open(filename, 'w+')
  f.write(data)

output = {
  'variables': { 'python': sys.executable },
  'target_defaults' : {
    'include_dirs': [],
    'libraries': [],
    'defines': [],
    'cflags': []
  }
}

def run_gyp(args):
  rc = gyp.main(args)
  if rc != 0:
    print 'Error running GYP'
    sys.exit(rc)

if __name__ == '__main__':
  configure_llmr(output)
  configure_glfw3(output)
  configure_png(output)
  pprint.pprint(output, indent=2)

  write('config.gypi', "# Do not edit. Generated by the configure script.\n" +
    pprint.pformat(output, indent=2) + "\n")

  config = {
    'BUILDTYPE': 'Debug' if options.debug else 'Release',
    'PYTHON': sys.executable,
  }
  config = '\n'.join(map('='.join, config.iteritems())) + '\n'

  write('config.mk',
        '# Do not edit. Generated by the configure script.\n' + config)

  gyp_args = []
  gyp_args.extend(['-f', 'make'])
  gyp_args.append(os.path.join(os.path.abspath(root_dir), 'llmr.gyp'))
  gyp_args.append('--depth=' + root_dir)
  output_dir = os.path.join(os.path.abspath(root_dir), 'out')
  gyp_args.extend(['--generator-output', output_dir])
  gyp_args.extend(['-Goutput_dir=' + output_dir])
  run_gyp(gyp_args)