version

#!/bin/bash
#
# The MIT License
# 
# Copyright (c) 2011 Mathias Leppich <mleppich@muhqu.de>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

usage() {
	echo "Usage: $0 [options] [action]"
	echo "Actions: "
	FORMAT="  %-30s %s\n"
	printf "$FORMAT" "curr" \
		"prints the current version"
	printf "$FORMAT" "incr major|minor|patch" \
		"prints the version with incremented major, minor or patch"
	printf "$FORMAT" "bump major|minor|patch" \
		"increments the version and creats a git tag"
	echo "Options: "
	printf "$FORMAT" "-v,--verbose" \
				"increases verbosity"
	printf "$FORMAT" "-f,--force" \
				"force a certain action"
}

read_version() {
	GIT_VERSION=$(git describe 2>/dev/null || git describe --tags)
	PREFIX=$(echo "$GIT_VERSION" | sed -e 's/[0-9].*//')
	SHORT_VERSION=$(echo "$GIT_VERSION" | sed -e 's/^'$PREFIX'//' -e 's/-.*//')
	MAJOR=$(echo "$SHORT_VERSION" | sed -E 's/([0-9]+).*/\1/')
	MINOR=$(echo "$SHORT_VERSION" | sed -E 's/[0-9]+\.([0-9]+).*/\1/')
	PATCH=$(echo "$SHORT_VERSION" | sed -E 's/[0-9]+\.[0-9]+\.([0-9]+).*/\1/')
	MAJOR=$((MAJOR+0))
	MINOR=$((MINOR+0))
	PATCH=$((PATCH+0))
}

print_version() {
	echo "$PREFIX$MAJOR.$MINOR.$PATCH"
}

version_current() {
	read_version;
	echo $GIT_VERSION;
}

version_incr_major() {
	read_version;
	MAJOR=$((MAJOR+1))
	MINOR=0
	PATCH=0
	print_version;
}

version_incr_minor() {
	read_version;
	MINOR=$((MINOR+1))
	PATCH=0
	print_version;
}

version_incr_patch() {
	read_version;
	PATCH=$((PATCH+1))
	print_version;
}

version_bump() {
	TAG="$1"
	STATUS=$(git status --porcelain | grep -v -e '^??' >/dev/null && echo DIRTY || echo CLEAN)
	if [ "$STATUS" == "DIRTY" -a "$FORCE" == "no" ]; then
		echo "git working copy is dirty, commit or stash changes and try again."
		echo "aborting.."
		exit 1;
	fi
	echo -e "version $TAG bumped $(date -u) by $(git config --get user.name)" | git tag "$TAG" -a -F - && echo "version bumped: $TAG";
}

version_bump_major() {
	TAG=$(version_incr_major)
	version_bump "$TAG";
}

version_bump_minor() {
	TAG=$(version_incr_minor)
	version_bump "$TAG";
}

version_bump_patch() {
	TAG=$(version_incr_patch)
	version_bump "$TAG";
}

VERBOSE="no"
FORCE="no"
ACTION="usage"
until [ -z "$1" ]; do
	case $1 in
		-v|--verbose)
			shift; VERBOSE="yes"
			;;
		-f|--force)
			shift; FORCE="yes"
			;;
		-h|--help|help)
			shift; ACTION="usage"
			;;
		-c|--curr|curr|current)
			shift; ACTION="version_current"
			;;
		-i|--inc|incr|increment)
			shift;
			if [ "$1" == "major" ]; then
				ACTION="version_incr_major"
			elif [ "$1" == "minor" ]; then
				ACTION="version_incr_minor"
			elif [ "$1" == "patch" ]; then
				ACTION="version_incr_patch"
			else
				echo "unknown option: $1";
				usage;
				exit 1
			fi
			shift;
			;;
		-b|--bump|bump)
			shift;
			if [ "$1" == "major" ]; then
				ACTION="version_bump_major"
			elif [ "$1" == "minor" ]; then
				ACTION="version_bump_minor"
			elif [ "$1" == "patch" ]; then
				ACTION="version_bump_patch"
			else
				echo "unknown option: $1";
				usage;
				exit 1
			fi
			shift;
			;;
		*)
			echo "unknown option: $1";
			usage;
			exit 1
			;;
	esac
done
$ACTION;
exit 0;