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from waftools.inflectors import DependencyInflector
from waftools.checks.generic import *
from waflib import Utils
import os

__all__ = ["check_pthreads", "check_iconv", "check_lua", "check_oss_4front",
           "check_cocoa"]

pthreads_program = load_fragment('pthreads.c')

def check_pthread_flag(ctx, dependency_identifier):
    checks = [
        check_cc(fragment = pthreads_program, cflags = '-pthread'),
        check_cc(fragment = pthreads_program, cflags = '-pthread',
                                            linkflags = '-pthread') ]

    for fn in checks:
        if fn(ctx, dependency_identifier):
            return True
    return False

def check_pthreads(ctx, dependency_identifier):
    if ctx.dependency_satisfied('win32-internal-pthreads'):
        h = ctx.path.find_node('osdep/win32/include').abspath()
        # define IN_WINPTHREAD to workaround mingw stupidity (we never want it
        # to define features specific to its own pthread stuff)
        ctx.env.CFLAGS += ['-isystem', h, '-I', h, '-DIN_WINPTHREAD']
        return True
    if check_pthread_flag(ctx, dependency_identifier):
        return True
    platform_cflags = {
        'linux':   '-D_REENTRANT',
        'freebsd': '-D_THREAD_SAFE',
        'netbsd':  '-D_THREAD_SAFE',
        'openbsd': '-D_THREAD_SAFE',
    }.get(ctx.env.DEST_OS, '')
    libs    = ['pthreadGC2', 'pthread']
    checkfn = check_cc(fragment=pthreads_program, cflags=platform_cflags)
    checkfn_nocflags = check_cc(fragment=pthreads_program)
    for fn in [checkfn, checkfn_nocflags]:
        if check_libs(libs, fn)(ctx, dependency_identifier):
            return True
    return False

def check_iconv(ctx, dependency_identifier):
    iconv_program = load_fragment('iconv.c')
    libdliconv = " ".join(ctx.env.LIB_LIBDL + ['iconv'])
    libs       = ['iconv', libdliconv]
    checkfn = check_cc(fragment=iconv_program)
    return check_libs(libs, checkfn)(ctx, dependency_identifier)

def check_lua(ctx, dependency_identifier):
    lua_versions = [
        ( '51',     'lua >= 5.1.0 lua < 5.2.0'),
        ( '51deb',  'lua5.1 >= 5.1.0'), # debian
        ( '51fbsd', 'lua-5.1 >= 5.1.0'), # FreeBSD
        ( '52',     'lua >= 5.2.0' ),
        ( '52deb',  'lua5.2 >= 5.2.0'), # debian
        ( '52fbsd', 'lua-5.2 >= 5.2.0'), # FreeBSD
        ( 'luajit', 'luajit >= 2.0.0' ),
    ]

    if ctx.options.LUA_VER:
        lua_versions = \
            [lv for lv in lua_versions if lv[0] == ctx.options.LUA_VER]

    for lua_version, pkgconfig_query in lua_versions:
        if check_pkg_config(pkgconfig_query, uselib_store=lua_version) \
            (ctx, dependency_identifier):
            # XXX: this is a bit of a hack, ask waf developers if I can copy
            # the uselib_store to 'lua'
            ctx.mark_satisfied(lua_version)
            ctx.add_optional_message(dependency_identifier,
                                     'version found: ' + lua_version)
            return True
    return False

def __get_osslibdir():
    cmd = ['sh', '-c', '. /etc/oss.conf && echo $OSSLIBDIR']
    p = Utils.subprocess.Popen(cmd, stdin=Utils.subprocess.PIPE,
                                    stdout=Utils.subprocess.PIPE,
                                    stderr=Utils.subprocess.PIPE)
    return p.communicate()[0].decode().rstrip()

def check_oss_4front(ctx, dependency_identifier):
    oss_libdir = __get_osslibdir()

    # avoid false positive from native sys/soundcard.h
    if not oss_libdir:
        defkey = DependencyInflector(dependency_identifier).define_key()
        ctx.undefine(defkey)
        return False

    soundcard_h = os.path.join(oss_libdir, "include/sys/soundcard.h")
    include_dir = os.path.join(oss_libdir, "include")

    fn = check_cc(header_name=soundcard_h,
                  defines=['PATH_DEV_DSP="/dev/dsp"',
                           'PATH_DEV_MIXER="/dev/mixer"'],
                  cflags='-I{0}'.format(include_dir),
                  fragment=load_fragment('oss_audio.c'))

    return fn(ctx, dependency_identifier)

def check_cocoa(ctx, dependency_identifier):
    fn = check_cc(
        fragment         = load_fragment('cocoa.m'),
        compile_filename = 'test.m',
        framework_name   = ['Cocoa', 'IOKit', 'OpenGL'],
        includes         = ctx.srcnode.abspath(),
        linkflags        = '-fobjc-arc')

    return fn(ctx, dependency_identifier)