# -*- mode: python; -*-

import subprocess

import SCons

# Helper functions for generic toolchain things go here


def get_toolchain_ver(env, tool):
    # By default we don't know the version of each tool, and only report what
    # command gets executed (gcc vs /opt/mongodbtoolchain/bin/gcc).
    verstr = "version unknown"
    proc = None
    if env.ToolchainIs("clang", "gcc"):
        proc = SCons.Action._subproc(
            env,
            env.subst("${%s} --version" % tool),
            stdout=subprocess.PIPE,
            stderr="devnull",
            stdin="devnull",
            universal_newlines=True,
            error="raise",
            shell=True,
        )
        verstr = proc.stdout.readline()

    elif env.ToolchainIs("msvc") and env.TargetOSIs("windows"):
        proc = SCons.Action._subproc(
            env,
            env.subst("${%s}" % tool),
            stdout="devnull",
            stderr=subprocess.PIPE,
            stdin="devnull",
            universal_newlines=True,
            error="raise",
            shell=True,
        )
        verstr = proc.stderr.readline()

    # If we started a process, we should drain its stdout/stderr and wait for
    # it to end.
    if proc:
        proc.communicate()

    return env.subst("${%s}: %s" % (tool, verstr))