"""Repository rule for Git autoconfiguration, borrow from tensorflow
"""
def _git_version_conf_impl(repository_ctx):
  repository_ctx.template(
      "BUILD.bazel",
      Label("//repository/git:BUILD.bazel.tpl"))

  mace_root_path = str(repository_ctx.path(Label("@mace//:BUILD.bazel")))[:-len("BUILD.bazel")]

  generated_files_path = repository_ctx.path("gen")

  ret = repository_ctx.execute(
      ["test", "-f", "%s/.git/logs/HEAD" % mace_root_path])
  if ret.return_code == 0:
    unused_var = repository_ctx.path(Label("//:.git/HEAD"))

  ret = repository_ctx.execute(
      ["test", "-f", "%s/.git/refs/heads/master" % mace_root_path])
  if ret.return_code == 0:
    unused_var = repository_ctx.path(Label("//:.git/refs/heads/master"))

  repository_ctx.execute([
      'bash', '%s/mace/tools/git/gen_version_source.sh' % mace_root_path
      , '%s/version' % generated_files_path
  ], quiet=False)


git_version_repository = repository_rule(
    implementation = _git_version_conf_impl,
)