#!/bin/bash
#
#  git-sync.sh - helper app for pull/push cycle with VERSION file update
#  Copyright (C) 2011  Clifford Wolf <clifford@clifford.at>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.

export LC_ALL=C

set -e

# make sure that everyone will recognize an error..
trap 'echo; echo; echo; banner "   ERROR" || echo "  *ERROR*"; echo; echo; exit 1' ERR

if [ ! -d .git ]; then
	echo "You need to run this command from the toplevel of the working tree." >&2
	false; exit 1
fi

if [ "$(git rev-parse master)" != "$(git rev-parse HEAD)" ]; then
	echo "You need to run this command from the HEAD of the master branch." >&2
	false; exit 1
fi

git pull

if [ "$(git rev-parse master)" != "$(git rev-parse origin/master)" ]
then
	if [ -f VERSION ]; then
		if ! egrep -q '\.[0-9]+$' VERSION || [ `wc -l < VERSION` -ne 1 ]; then
			echo "Invalid syntax in VERSION file!" >&2
			false; exit 1
		fi
		gawk 'BEGIN { FS="."; OFS="."; } { $NF++; print $0; }' < VERSION > .VERSION.tmp
		echo "Updated version file: `cat VERSION` -> `cat .VERSION.tmp`"
		mv .VERSION.tmp VERSION
		git commit -C HEAD --amend VERSION
	fi

	git push
fi

echo "READY."