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#
# Copyright The SCons Foundation
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"""Tool-specific initialization for clang.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.
"""

# Based on SCons/Tool/gcc.py by Paweł Tomulik 2014 as a separate tool.
# Brought into the SCons mainline by Russel Winder 2017.

import os
import re
import subprocess

import SCons.Util
import SCons.Tool.cc
from SCons.Tool.clangCommon import get_clang_install_dirs
from SCons.Tool.MSCommon import msvc_setup_env_once


compilers = ['clang']


def generate(env):
    """Add Builders and construction variables for clang to an Environment."""
    SCons.Tool.cc.generate(env)

    if env['PLATFORM'] == 'win32':
        # Ensure that we have a proper path for clang
        clang = SCons.Tool.find_program_path(env, compilers[0], 
                                             default_paths=get_clang_install_dirs(env['PLATFORM']))
        if clang:
            clang_bin_dir = os.path.dirname(clang)
            env.AppendENVPath('PATH', clang_bin_dir)

            # Set-up ms tools paths
            msvc_setup_env_once(env)

    env['CC'] = env.Detect(compilers) or 'clang'
    if env['PLATFORM'] in ['cygwin', 'win32']:
        env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS')
    else:
        env['SHCCFLAGS'] = SCons.Util.CLVar('$CCFLAGS -fPIC')

    # determine compiler version
    if env['CC']:
        # pipe = SCons.Action._subproc(env, [env['CC'], '-dumpversion'],
        pipe = SCons.Action._subproc(env, [env['CC'], '--version'],
                                     stdin='devnull',
                                     stderr='devnull',
                                     stdout=subprocess.PIPE)
        if pipe.wait() != 0: return
        # clang -dumpversion is of no use
        with pipe.stdout:
            line = pipe.stdout.readline()
        line = line.decode()
        match = re.search(r'clang +version +([0-9]+(?:\.[0-9]+)+)', line)
        if match:
            env['CCVERSION'] = match.group(1)

    env['CCDEPFLAGS'] = '-MMD -MF ${TARGET}.d'
    env["NINJA_DEPFILE_PARSE_FORMAT"] = 'clang'


def exists(env):
    return env.Detect(compilers)

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