#!/usr/bin/env python
from __future__ import generators
import user
import config.autoconf
import os
import config.package

class Configure(config.package.Package,config.autoconf.Configure):
  def __init__(self, framework):
    config.autoconf.Configure.__init__(self, framework)
    config.package.Package.__init__(self, framework)
    self.headerPrefix = ''
    self.substPrefix  = ''
    self.foundlibxml2     = 0
    return

  def __str__(self):
    if self.foundlibxml2:
      desc = ['libxml2:']	
      desc.append('  Includes: '+str(self.include))
      desc.append('  Library: '+str(self.lib))
      return '\n'.join(desc)+'\n'
    return ''
    
  def setupHelp(self, help):
    import nargs
    help.addArgument('libxml2', '-with-libxml2-include=<include dir>', nargs.ArgDir(None, None, 'Specify an include directory for libxml2'))
    help.addArgument('libxml2', '-with-libxml2-libdir=<lib dir>',         nargs.Arg(None, None,    'Specify libxml2 library directory'))
    return

  def setupDependencies(self, framework):
    config.package.Package.setupDependencies(self, framework)
    return

  def configureLibrary(self):
    '''Checks for libxml2 and defines LIBXML2_CPPPATH, LIBXML2_LIBPATH, and LIBXML2_LIBS'''

    foundInclude = 0
    includeDirs  = ['/usr/include/libxml2',
                    '/usr/include',
                   '/usr/local/include',
                   '/usr/local/libxml2/include']
    includeDir   = ''
    foundLibrary = 0
    libraryDirs  = map(lambda s: s.replace('include', 'lib'), includeDirs)
    libraryDir   = ''

    # Check for libxml2 includes
    if self.framework.argDB.has_key('with-libxml2-include'):
      if not os.path.isdir(self.framework.argDB['with-libxml2-include']):
        raise RuntimeError('Invalid libxml2 include directory specified by --with-libxml2-include='+os.path.abspath(self.framework.argDB['with-libxml2-include']))
      includeDir = self.framework.argDB['with-libxml2-include']
      foundInclude = 1
    else:
      testInclude  = 'libxml/tree.h'

      if self.checkPreprocess('#include <'+testInclude+'>\n'):
        foundInclude = 1
      # Check standard paths
      if not foundInclude:
        for dir in includeDirs:
          if os.path.isfile(os.path.join(dir, testInclude)):
            foundInclude = 1
            includeDir   = dir
    # Check for libxml2 libraries
    if self.framework.argDB.has_key('with-libxml2-libdir'):
      if not os.path.isdir(self.framework.argDB['with-libxml2-libdir']):
        raise RuntimeError('Invalid libxml2 library specified by --with-libxml2-libdir='+os.path.abspath(self.framework.argDB['with-libxml2-libdir']))
      libraryDir = self.framework.argDB['with-libxml2-libdir']
      foundLibrary = 1
    else:
      testLibrary  = 'xml2'
      testFunction = 'xmlCleanupParser'

      # Check default compiler libraries
      if not foundLibrary:
        oldLibs = self.compilers.LIBS
        self.compilers.LIBS += ' -l'+testLibrary
        self.pushLanguage(self.language[-1])
        if self.checkLink('', testFunction+'();\n'):
          foundLibrary = 1
        self.compilers.LIBS = oldLibs
        self.popLanguage()
      # Check standard paths
      if not foundLibrary:
        for dir in libraryDirs:
          for ext in ['.a', '.so', '.sl']:
            if os.path.isfile(os.path.join(dir, 'lib'+testLibrary+ext)):
              foundLibrary = 1
              libraryDir   = dir
      # Verify that library can be linked with
      if foundLibrary:
        oldLibs = self.compilers.LIBS
        if libraryDir:
          self.compilers.LIBS += ' -L'+libraryDir
        self.compilers.LIBS += ' -l'+testLibrary
        self.pushLanguage(self.language[-1])
        if not self.checkLink('', testFunction+'();\n'):
          foundLibrary = 0
        self.compilers.LIBS = oldLibs
        self.popLanguage()
          
    if foundInclude and foundLibrary:
      self.logPrint('Found libxml2 includes and libraries')
      self.foundlibxml2  = 1
      cpppath = ''
      if includeDir:
        cpppath = includeDir
      libpath=''
      if libraryDir:
        libpath     = libraryDir
      libs='xml2'
      self.lib     = '-lxml2'

      self.addSubstitution('LIBXML2_CPPPATH',    cpppath)
      self.addSubstitution('LIBXML2_LIBPATH',    libpath)
      self.addSubstitution('LIBXML2_LIBS',       libs)
      if hasattr(self.framework, 'packages'):
        self.framework.packages.append(self)
    else:
      if not foundInclude:
        msg='Could not find libxml2 includes.  Tried\n'
        for d in includeDirs:
          msg+=d + "\n"
        msg+='Try using the --with-libxml2-include option.'
        raise RuntimeError(msg)
      if not foundLibrary:
        msg='Could not find libxml2 libraries.  Tried\n'
        for d in libraryDirs:
          msg+=d + "\n"
        msg+='Try using the --with-libxml2-libdir option.'
        raise RuntimeError(msg)
    return

  def configure(self):
    self.executeTest(self.configureLibrary)
    return

if __name__ == '__main__':
  import config.framework
  import sys
  framework = config.framework.Framework(sys.argv[1:])
  framework.setup()
  framework.addChild(Configure(framework))
  framework.configure()
  framework.dumpSubstitutions()