#!/bin/bash -eu
# Copyright 2016 Google Inc.
#
# 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.
#
################################################################################

# Deterimine srcmap of checked out source code

SRCMAP=$(tempfile)
echo "{}" > $SRCMAP

# $1 - json file, $2 - jq program
function jq_inplace() {
  F=$(tempfile) && cat $1 | jq "$2" > $F && mv $F $1
}

# Git
for DOT_GIT_DIR in $(find $SRC -name ".git" -type d); do
  GIT_DIR=$(dirname $DOT_GIT_DIR)
  cd $GIT_DIR
  GIT_URL=$(git config --get remote.origin.url)
  GIT_REV=$(git rev-parse HEAD)
  jq_inplace $SRCMAP ".\"$GIT_DIR\" = { type: \"git\", url: \"$GIT_URL\", rev: \"$GIT_REV\" }"
done

# Subversion
for DOT_SVN_DIR in $(find $SRC -name ".svn" -type d); do
  SVN_DIR=$(dirname $DOT_SVN_DIR)
  cd $SVN_DIR
  SVN_URL=$(svn info | grep "^URL:" | sed  's/URL: //g')
  SVN_REV=$(svn info -r HEAD | grep "^Revision:" | sed  's/Revision: //g')
  jq_inplace $SRCMAP ".\"$SVN_DIR\" = { type: \"svn\", url: \"$SVN_URL\", rev: \"$SVN_REV\" }"
done

# Mercurial
for DOT_HG_DIR in $(find $SRC -name ".hg" -type d); do
  HG_DIR=$(dirname $DOT_HG_DIR)
  cd $HG_DIR
  HG_URL=$(hg paths default)
  HG_REV=$(hg --debug id -i)
  jq_inplace $SRCMAP ".\"$HG_DIR\" = { type: \"hg\", url: \"$HG_URL\", rev: \"$HG_REV\" }"
done

cat $SRCMAP
rm $SRCMAP