Import("env")

import subprocess


def git(*args):
    try:
        return subprocess.check_output(
            ["git"] + list(args), stderr=subprocess.DEVNULL
        ).strip().decode("ascii")
    except Exception:
        return None

# count number of commits.
build_number = git("rev-list", "--count", "HEAD") or "0"

env.Append(BUILD_FLAGS=[
    "-DBUILD_NUMBER=%s" % build_number
])