#!/usr/bin/env python

import os, string
from samba_utils import MODE_755
from waflib import Logs

# This function checks if a perl module is installed on the system.
def check_system_perl_module(conf, module, version=None):
    bundle_name = module.replace('::', '_')
    module_check = module

    # Create module string with version
    if version:
        module_check = module + ' ' + str(version)

    # Check if we have to bundle it.
    if conf.LIB_MUST_BE_BUNDLED(bundle_name.lower()):
        return False

    # Check for system perl module
    if conf.check_perl_module(module_check) is None:
        return False

    conf.define('USING_SYSTEM_%s' % bundle_name.upper(), 1)

    return True

def options(opt):
    return

def configure(conf):
    # Check if perl(Parse::Yapp::Driver) is available.
    check_system_perl_module(conf, "Parse::Yapp::Driver", 1.05)

    # we need a recent version of MakeMaker to get the right man page names
    if conf.CHECK_PERL_MANPAGE():
        conf.env.PERLMAN1EXT = conf.CHECK_PERL_MANPAGE(section='1')
        conf.env.PERLMAN3EXT = conf.CHECK_PERL_MANPAGE(section='3')
        conf.DEFINE('HAVE_PERL_MAKEMAKER', 1)

    # yapp is used for building the parser
    conf.find_program('yapp', var='YAPP')
    conf.find_program('pod2man', var='POD2MAN')

def build(bld):
    bld.INSTALL_FILES('${BINDIR}', 'pidl', chmod=MODE_755, perl_fixup=True)

    bld.RECURSE('lib')

    if not bld.CONFIG_SET('HAVE_PERL_MAKEMAKER'):
        return

    pidl_manpages = {
        'pidl': 'man1/pidl.${PERLMAN1EXT}',
        'lib/Parse/Pidl/NDR.pm': 'man3/Parse::Pidl::NDR.${PERLMAN3EXT}',
        'lib/Parse/Pidl/Wireshark/Conformance.pm': 'man3/Parse::Pidl::Wireshark::Conformance.${PERLMAN3EXT}',
        'lib/Parse/Pidl/Dump.pm': 'man3/Parse::Pidl::Dump.${PERLMAN3EXT}',
        'lib/Parse/Pidl/Util.pm': 'man3/Parse::Pidl::Util.${PERLMAN3EXT}',
        'lib/Parse/Pidl/Wireshark/NDR.pm': 'man3/Parse::Pidl::Wireshark::NDR.${PERLMAN3EXT}'
    }

    for k in pidl_manpages.keys():
        pidl_manpages[k] = bld.EXPAND_VARIABLES(pidl_manpages[k])

    # use perl to build the manpages
    bld.env.pidl_srcdir = os.path.join(bld.srcnode.abspath(), 'pidl')

    bld.SET_BUILD_GROUP('final')
    if 'POD2MAN' in bld.env and bld.env['POD2MAN'] != '':
        for src in pidl_manpages.keys():
            manpage = pidl_manpages[src]
            section = manpage.rsplit( ".", 1)[1]
            bld(rule='${POD2MAN} -c "Samba Documentation" -s %s ${SRC} ${TGT}' % section,
                shell=True,
                source=src,
                install_path=os.path.dirname(bld.EXPAND_VARIABLES('${MANDIR}/'+manpage)),
                target=os.path.basename(manpage))

    # we want to prefer the git version of the parsers if we can.
    # Only if the source has changed do we want to re-run yapp
    # But we force the developer to use the pidl standalone build
    # to regenerate the files.
    # TODO: only warn in developer mode and if 'git diff HEAD'
    #       shows a difference
    warn_about_grammar_changes = ('PIDL_BUILD_WARNINGS' in bld.env and (
        bld.IS_NEWER('idl.yp', 'lib/Parse/Pidl/IDL.pm') or
        bld.IS_NEWER('expr.yp', 'lib/Parse/Pidl/Expr.pm')))

    if warn_about_grammar_changes:
        Logs.warn('''
Pidl grammar files have changed. Please use the pidl standalone build
to regenerate them with yapp.

$ cd ../pidl
$ perl Makefile.PL
$ make lib/Parse/Pidl/IDL.pm lib/Parse/Pidl/Expr.pm
$ git add lib/Parse/Pidl/IDL.pm lib/Parse/Pidl/Expr.pm
$ git commit
$ cd -

If your 100% sure you haven't changed idl.yp and expr.yp
try this to avoid this message:

$ touch ../pidl/lib/Parse/Pidl/IDL.pm ../pidl/lib/Parse/Pidl/Expr.pm
''')