#!/bin/bash
#

# Copyright (C) 2010,2013 Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

set -e

# Enable Bash-specific patterns
shopt -s extglob

readonly version=$1
readonly newsfile=$2
readonly numpat='+([0-9])'

case "$version" in
  # Format "x.y.z"
  $numpat.$numpat.$numpat) : ;;

  # Format "x.y.z~rcN" or "x.y.z~betaN" or "x.y.z~alphaN" for N > 0
  $numpat.$numpat.$numpat~@(rc|beta|alpha)[1-9]*([0-9])) : ;;

  *)
    echo "Invalid version format: $version" >&2
    exit 1
  ;;
esac

readonly newsver="Version ${version/\~/ }"

# Only alpha versions are allowed not to have their own NEWS section yet
set +e
FOUND=x`echo $version | grep "alpha[1-9]*[0-9]$"`
set -e
if [ $FOUND == "x" ]
then
  if ! grep -q -x "$newsver" $newsfile
  then
    echo "Unable to find heading '$newsver' in NEWS" >&2
    exit 1
  fi
fi

exit 0