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#!/usr/bin/env python

import os

def set_options(opt):
    opt.tool_options('perl')

def configure(conf):
    conf.check_tool('perl')
    # 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')

def build(bld):
    bld.INSTALL_FILES('${BINDIR}', 'pidl', chmod=0755)

    bld.RECURSE('lib')

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

    pidl_src = ['pidl']
    pidl_src.extend(bld.path.ant_glob('lib/**/*.pm').split())

    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, v in pidl_manpages.iteritems():
        pidl_manpages[k] = bld.EXPAND_VARIABLES(v)

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

    blib_bld = os.path.join(bld.srcnode.abspath(bld.env), 'pidl/blib')

    link_command = 'rm -rf blib && ln -fs blib %s' % blib_bld
    
    bld.SET_BUILD_GROUP('main')
    for src, manpage in pidl_manpages.iteritems():
        bld(rule='pod2man -c "Samba Documentation" ${SRC} ${TGT}', 
            shell=True,
            source=src,
            install_path=os.path.dirname(bld.EXPAND_VARIABLES('${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
    need_yapp_build = ('YAPP' 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 need_yapp_build:
        t = bld.SAMBA_GENERATOR('pidl_parser',
                                source='idl.yp expr.yp',
                                target='lib/Parse/Pidl/IDL.pm lib/Parse/Pidl/Expr.pm Makefile.PL',
                                rule='cd ${pidl_srcdir} && ${LINK_COMMAND} && ${PERL} Makefile.PL && make lib/Parse/Pidl/IDL.pm lib/Parse/Pidl/Expr.pm && rm -f Makefile Makefile.old && rm -f blib')
        t.env.LINK_COMMAND = link_command