#!/bin/bash
#
# Copyright (C) 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

usage() {
  me=`basename "$0"`
  echo >&2 "Usage: $me [open] [-b branch] [path]"
  exit 1
}

cmd_open() {
  case "$(uname)" in
    Darwin)
      echo "open"
      ;;
    Linux)
      echo "xdg-open"
      ;;

    *)
      echo >&2 "Don't know how to open URLs on $(uname)"
      exit 1
  esac
}

URL=$(git config --get gitiles.url)

if test -z "$URL" ; then
  echo >&2 "gitiles.url must be set in .git/config"
  exit 1
fi

while test $# -gt 0 ; do
  case "$1" in
  open)
    CMD=$(cmd_open)
    shift
    ;;
  -b|--branch)
    shift
    B=$1
    shift
    ;;
  -h|--help)
    usage
    ;;

  *)
    P=$1
    shift
  esac
done

if test -z "$CMD" ; then
  CMD=echo
fi

if test -z "$B" ; then
  B=$(git rev-parse HEAD)
fi

URL="$URL/+/$B"

if test -z "$P" ; then
  P=$(git rev-parse --show-prefix)
elif test ${P:0:2} = "./" ; then
  P=$(git rev-parse --show-prefix)${P:2}
fi

URL="$URL/$P"

$CMD $URL