#!/usr/bin/env python3
# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Redirects to the version of google-java-format checked into the Chrome tree.

google-java-format executable is pulled down from the cipd storage whenever
you sync Chrome. This script finds and runs the executable.
"""

import gclient_paths
import os
import subprocess
import sys


def FindGoogleJavaFormat():
    """Returns the path to the google-java-format executable."""
    # Allow non-chromium projects to use a custom location.
    primary_solution_path = gclient_paths.GetPrimarySolutionPath()
    if primary_solution_path:
        override = os.environ.get("GOOGLE_JAVA_FORMAT_PATH")
        if override:
            # Make relative to solution root if not an absolute path.
            return os.path.join(primary_solution_path, override)

        bin_path = os.path.join(
            primary_solution_path,
            "third_party",
            "google-java-format",
            "google-java-format",
        )
        cipd_path = os.path.join(
            primary_solution_path,
            "third_party",
            "google-java-format",
            "cipd",
            "google-java-format.jar",
        )

        # Check that the .jar exists, since it is conditionally downloaded via
        # DEPS conditions.
        if os.path.exists(bin_path) and (
            os.path.exists(bin_path + ".jar") or os.path.exists(cipd_path)
        ):
            return bin_path
    return None


def main(args):
    google_java_format = FindGoogleJavaFormat()
    if google_java_format is None:
        # If google-java-format cannot be found, it could be we are on an
        # old chromium revision, or that it is a non-chromium project.
        # https://crbug.com/1491627.
        #
        # Signal an error (matching google-java-format's exit status for
        # a usage error), otherwise the caller is allowed to interpret this
        # script's stdout as the formatted code.
        print(
            'google-java-format not found. Please run "gclient sync" to '
            "download build tools.",
            file=sys.stderr,
        )
        return 2

    # Add some visibility to --help showing where the tool lives, since this
    # redirection can be a little opaque.
    help_syntax = ("-h", "--help", "-help", "-help-list", "--help-list")
    if any(match in args for match in help_syntax):
        print(
            "\nDepot tools redirects you to the google-java-format at:\n"
            + "    %s\n" % google_java_format
        )

    return subprocess.call([google_java_format] + args)


if __name__ == "__main__":
    try:
        sys.exit(main(sys.argv[1:]))
    except KeyboardInterrupt:
        sys.stderr.write("interrupted\n")
        sys.exit(1)