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#
# dsextras.py - Extra classes and utilities
#
# TODO:
# Make it possible to import codegen from another dir
#

from distutils.command.build_ext import build_ext
from distutils.command.install_lib import install_lib
from distutils.command.install_data import install_data
from distutils.extension import Extension
import fnmatch
import os
import re
import string
import sys

GLOBAL_INC = []
GLOBAL_MACROS = []

def get_m4_define(varname):
    """Return the value of a m4_define variable as set in configure.in."""
    pattern=re.compile("m4_define\("+varname+"\,\s*(.+)\)")
    for line in open("configure.in").readlines():
        match_obj=pattern.match(line)
        if match_obj:
            return match_obj.group(1)

    return None

def getoutput(cmd):
    """Return output (stdout or stderr) of executing cmd in a shell."""
    return getstatusoutput(cmd)[1]

def getstatusoutput(cmd):
    """Return (status, output) of executing cmd in a shell."""
    if sys.platform == 'win32':
        pipe = os.popen(cmd, 'r')
        text = pipe.read()
        sts = pipe.close() or 0
        if text[-1:] == '\n':
            text = text[:-1]
        return sts, text
    else:
        from commands import getstatusoutput
        return getstatusoutput(cmd)

def have_pkgconfig():
    """Checks for the existence of pkg-config"""
    if (sys.platform == 'win32' and
        os.system('pkg-config --version > NUL') == 0):
        return 1
    else:
        if getstatusoutput('pkg-config')[0] == 256:
            return 1

def list_files(dir):
    """List all files in a dir, with filename match support:
    for example: glade/*.glade will return all files in the glade directory
    that matches *.glade. It also looks up the full path"""
    if dir.find(os.sep) != -1:
        parts = dir.split(os.sep)
        dir = string.join(parts[:-1], os.sep)
        pattern = parts[-1]
    else:
        pattern = dir
        dir = '.'

    dir = os.path.abspath(dir)
    retval = []
    for file in os.listdir(dir):
        if fnmatch.fnmatch(file, pattern):
            retval.append(os.path.join(dir, file))
    return retval

def pkgc_version_check(name, longname, req_version):
    is_installed = not os.system('pkg-config --exists %s' % name)
    if not is_installed:
        print "Could not find %s" % longname
        return 0
    
    orig_version = getoutput('pkg-config --modversion %s' % name)
    version = map(int, orig_version.split('.'))
    pkc_version = map(int, req_version.split('.'))
                      
    if version >= pkc_version:
        return 1
    else:
        print "Warning: Too old version of %s" % longname
        print "         Need %s, but %s is installed" % \
              (pkc_version, orig_version)
        self.can_build_ok = 0
        return 0

class BuildExt(build_ext):
    def init_extra_compile_args(self):
        self.extra_compile_args = []
        if sys.platform == 'win32' and \
           self.compiler.compiler_type == 'mingw32':
            # MSVC compatible struct packing is required.
            # Note gcc2 uses -fnative-struct while gcc3
            # uses -mms-bitfields. Based on the version
            # the proper flag is used below.
           msnative_struct = { '2' : '-fnative-struct',
                                '3' : '-mms-bitfields' }
            gcc_version = getoutput('gcc -dumpversion')
            print 'using MinGW GCC version %s with %s option' % \
                  (gcc_version, msnative_struct[gcc_version[0]])
            self.extra_compile_args.append(msnative_struct[gcc_version[0]])
    
    def modify_compiler(self):
        if sys.platform == 'win32' and \
           self.compiler.compiler_type == 'mingw32':
            # Remove '-static' linker option to prevent MinGW ld
            # from trying to link with MSVC import libraries.
            if self.compiler.linker_so.count('-static'):
                self.compiler.linker_so.remove('-static')
    
    def build_extensions(self):
        # Init self.extra_compile_args
        self.init_extra_compile_args()
        # Modify default compiler settings
        self.modify_compiler()
        # Invoke base build_extensions()
        build_ext.build_extensions(self)
        
    def build_extension(self, ext):
        # Add self.extra_compile_args to ext.extra_compile_args
        ext.extra_compile_args += self.extra_compile_args
        # Generate eventual templates before building
        if hasattr(ext, 'generate'):
            ext.generate()
        # Invoke base build_extension()
        build_ext.build_extension(self, ext)

class InstallLib(install_lib):

    local_outputs = []
    local_inputs = []
        
    def set_install_dir(self, install_dir):
        self.install_dir = install_dir
    
    def get_outputs(self):
        return install_lib.get_outputs(self) + self.local_outputs

    def get_inputs(self):
        return install_lib.get_inputs(self) + self.local_inputs

class InstallData(install_data):
    
    local_outputs = []
    local_inputs = []
    template_options = {}

    def prepare(self):
        if os.name == "nt":
            self.prefix = os.sep.join(self.install_dir.split(os.sep)[:-3])
        else:
           # default: os.name == "posix"
            self.prefix = os.sep.join(self.install_dir.split(os.sep)[:-4])

        self.exec_prefix = '${prefix}/bin'
        self.includedir = '${prefix}/include'
        self.libdir = '${prefix}/lib'
        self.datadir = '${prefix}/share'
        
        self.add_template_option('prefix', self.prefix)        
        self.add_template_option('exec_prefix', self.exec_prefix)        
        self.add_template_option('includedir', self.includedir)
        self.add_template_option('libdir', self.libdir)
        self.add_template_option('datadir', self.datadir)
        self.add_template_option('PYTHON', sys.executable)
        self.add_template_option('THREADING_CFLAGS', '')
        
    def set_install_dir(self, install_dir):
        self.install_dir = install_dir
        
    def add_template_option(self, name, value):
        self.template_options['@%s@' % name] = value

    def install_template(self, filename, install_dir):
        """Install template filename into target directory install_dir."""
        output_file = os.path.split(filename)[-1][:-3]

        template = open(filename).read()
        for key, value in self.template_options.items():
            template = template.replace(key, value)
        
        output = os.path.join(install_dir, output_file)
        self.mkpath(install_dir)
        open(output, 'w').write(template)
        self.local_inputs.append(filename)
        self.local_outputs.append(output)
        return output
    
    def get_outputs(self):
        return install_lib.get_outputs(self) + self.local_outputs

    def get_inputs(self):
        return install_lib.get_inputs(self) + self.local_inputs
    
class PkgConfigExtension(Extension):
    can_build_ok = None
    def __init__(self, **kwargs):
        name = kwargs['pkc_name']
        kwargs['include_dirs'] = self.get_include_dirs(name) + GLOBAL_INC
        kwargs['define_macros'] = GLOBAL_MACROS
        kwargs['libraries'] = self.get_libraries(name)
        kwargs['library_dirs'] = self.get_library_dirs(name)
        self.name = kwargs['name']
        self.pkc_name = kwargs['pkc_name']
        self.pkc_version = kwargs['pkc_version']
        del kwargs['pkc_name'], kwargs['pkc_version']
        Extension.__init__(self, **kwargs)

    def get_include_dirs(self, name):
        output = getoutput('pkg-config --cflags-only-I %s' % name)
        return output.replace('-I', '').split()

    def get_libraries(self, name):
        output = getoutput('pkg-config --libs-only-l %s' % name)
        return output.replace('-l', '').split()
    
    def get_library_dirs(self, name):
        output = getoutput('pkg-config --libs-only-L %s' % name)
        return output.replace('-L', '').split()

    def can_build(self):
        """If the pkg-config version found is good enough"""
        if self.can_build_ok != None:
            return self.can_build_ok

        retval = os.system('pkg-config --exists %s' % self.pkc_name)
        if retval:
            print ("* %s.pc could not be found, bindings for %s"
                   " will not be built." % (self.pkc_name, self.name))
            self.can_build_ok = 0
            return 0

        orig_version = getoutput('pkg-config --modversion %s' % self.pkc_name)
        version = map(int, orig_version.split('.'))
        pkc_version = map(int, self.pkc_version.split('.'))
                      
        if version >= pkc_version:
            self.can_build_ok = 1
            return 1
        else:
            print "Warning: Too old version of %s" % self.pkc_name
            print "         Need %s, but %s is installed" % \
                  (self.pkc_version, orig_version)
            self.can_build_ok = 0
            return 0
        
    def generate(self):
        pass
       
class Template:
    def __init__(self, override, output, defs, prefix,
                 register=[], load_types=None):
        self.override = override
        self.defs = defs
        self.register = register
        self.output = output
        self.prefix = prefix
        self.load_types = load_types
        
    def check_dates(self):
        if not os.path.exists(self.output):
            return 0

        files = self.register[:]
        files.append(self.override)
#        files.append('setup.py')
        files.append(self.defs)
        
        newest = 0
        for file in files:
            test = os.stat(file)[8]
            if test > newest:
                newest = test
                
        if newest < os.stat(self.output)[8]:
            return 1
        return 0
    
    def generate(self):
        # We must insert it first, otherwise python will try '.' first,
        # in which it exist a "bogus" codegen (the third import line
        # here will fail)
        sys.path.insert(0, 'codegen')
        from override import Overrides
        from defsparser import DefsParser
        from codegen import register_types, write_source, FileOutput
        
        if self.check_dates():
            return

        for item in self.register:
            dp = DefsParser(item)
            dp.startParsing()
            register_types(dp)

        if self.load_types:
            globals = {}
            execfile(self.load_types, globals)
            
        dp = DefsParser(self.defs)
        dp.startParsing()
        register_types(dp)
        
        fd = open(self.output, 'w')
        write_source(dp,
                     Overrides(self.override),
                     self.prefix,
                     FileOutput(fd, self.output))
        fd.close()
        
class TemplateExtension(PkgConfigExtension):
    def __init__(self, **kwargs):
        name = kwargs['name']
        defs = kwargs['defs']
        output = defs[:-5] + '.c'
        override = kwargs['override']
        load_types = kwargs.get('load_types')
        self.templates = []
        self.templates.append(Template(override, output, defs, 'py' + name,
                                       kwargs['register'], load_types))
        
        del kwargs['register'], kwargs['override'], kwargs['defs']
        if load_types:
           del kwargs['load_types']
           
        if kwargs.has_key('output'):
            kwargs['name'] = kwargs['output']
            del kwargs['output']
        
        PkgConfigExtension.__init__(self, **kwargs)
        
    def generate(self):
        map(lambda x: x.generate(), self.templates)
        
        


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