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from waflib import Utils
from waflib.Configure import conf
from samba_utils import get_string
done = {}

@conf
def SAMBA_CHECK_PERL(conf, mandatory=True, version=(5,0,0)):
    if "done" in done:
        return
    done["done"] = True
    conf.find_program('perl', var='PERL', mandatory=mandatory)
    conf.load('perl')
    path_perl = conf.find_program('perl')
    conf.env.PERL_SPECIFIED = (conf.env.PERL != path_perl)
    conf.check_perl_version(version)

    def read_perl_config_var(cmd):
        output = Utils.cmd_output([conf.env.get_flat('PERL'), '-MConfig', '-e', cmd])
        if not isinstance(output, str):
            output = get_string(output)
        return Utils.to_list(output)

    def check_perl_config_var(var):
        conf.start_msg("Checking for perl $Config{%s}:" % var)
        try:
            v = read_perl_config_var('print $Config{%s}' % var)[0]
            conf.end_msg("'%s'" % (v), 'GREEN')
            return v
        except IndexError:
            conf.end_msg(False, 'YELLOW')
        return None

    vendor_prefix = check_perl_config_var('vendorprefix')

    perl_arch_install_dir = None
    if vendor_prefix == conf.env.PREFIX:
        perl_arch_install_dir = check_perl_config_var('vendorarch');
    if perl_arch_install_dir is None:
        perl_arch_install_dir = "${LIBDIR}/perl5";
    conf.start_msg("PERL_ARCH_INSTALL_DIR: ")
    conf.end_msg("'%s'" % (perl_arch_install_dir), 'GREEN')
    conf.env.PERL_ARCH_INSTALL_DIR = perl_arch_install_dir

    perl_lib_install_dir = None
    if vendor_prefix == conf.env.PREFIX:
        perl_lib_install_dir = check_perl_config_var('vendorlib');
    if perl_lib_install_dir is None:
        perl_lib_install_dir = "${DATADIR}/perl5";
    conf.start_msg("PERL_LIB_INSTALL_DIR: ")
    conf.end_msg("'%s'" % (perl_lib_install_dir), 'GREEN')
    conf.env.PERL_LIB_INSTALL_DIR = perl_lib_install_dir

    perl_inc = read_perl_config_var('print "@INC"')
    if '.' in perl_inc:
        perl_inc.remove('.')
    conf.start_msg("PERL_INC: ")
    conf.end_msg("%s" % (perl_inc), 'GREEN')
    conf.env.PERL_INC = perl_inc