#!/bin/sh

# Copyright 2008 Paul Wise

# Copyright 2009 Konstantin Dmitriev

#

# This package 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.

#

# This package is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

# General Public License for more details.

get_git_id(){

	export SCM=git

	export REVISION_ID=`cd "$1"; git log --no-color -1 | head -n 1 | cut -f 2 -d ' ' | cut -c -6`

	export BRANCH="`cd "$1"; git branch -a --no-color --contains HEAD | sed -e s/\*\ // | sed -e s/\(no\ branch\)// | tr '\n' ' ' | tr -s ' ' | sed s/^' '//`"

	if ( echo $BRANCH | egrep origin/master > /dev/null ); then

		#give a priority to master branch

		BRANCH='master'

	else

		BRANCH=`echo $BRANCH | cut -d ' ' -f 1`

		BRANCH=${BRANCH##*/}

	fi

	export REVISION=`git show --pretty=format:%ci HEAD |  head -c 10 | tr -d '-'`

	export COMPARE=`git rev-parse --git-dir`

	# The extra * at the end is for Modified

	#REVISION="$REVISION"`cd "$1"; [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo "*"`

}

get_git_svn_id(){

	export SCM=git-svn

	export REVISION=`cd "$1"; git svn find-rev HEAD`

	export COMPARE="$1/.git/"

	if [ x = "x$REVISION" ] ; then

		# The extra M at the end is for Modified

		export REVISION=`cd "$1"; git svn find-rev \`git rev-list --max-count=1 --grep='git-svn-id: ' HEAD\``M

	else

		export REVISION="$REVISION"`cd "$1"; git diff --quiet HEAD || echo M`

	fi

}

get_svn_id(){

	export SCM=svn

	export REVISION=`cd "$1"; svnversion || svn info | sed -n 's/^Revision: \(.*\)/\1/p'`

}

HEADER="$2/autorevision.h"

SCM=none

if [ ! -f "$HEADER" ] ; then

	touch -t 197001010101 "$HEADER"

fi

# Extract the revision from SVN/git/etc

if git rev-parse --git-dir > /dev/null  2>&1 ; then

	get_git_id "."

elif [ -d "$1/.git/svn" ] ; then

	get_git_svn_id "$1"

elif [ -d "$1/../.git/svn" ] ; then

	get_git_svn_id "$1/.."

elif [ -d "$1/../../.git/svn" ] ; then

	get_git_svn_id "$1/../.."

elif [ -d "$1/.svn" ] ; then

	COMPARE="$1/.svn"

	get_svn_id "$1"

elif [ -d "$1/_svn" ] ; then

	COMPARE="$1/_svn"

	get_svn_id "$1"

fi

# Allow overriding both REVISION and DEVEL_VERSION

if [ -f "$2/autorevision.conf" ] ; then

	SCM=manual

	. "$2/autorevision.conf"

fi

# Abort if the header is newer

if [ "$COMPARE" -ot "$HEADER" ] ; then exit; fi

# Set the development version string

if [ x = "x$DEVEL_VERSION" ] ; then

	if [ x != "x$REVISION" ] ; then

		if [ $SCM = svn ] ; then

			DEVEL_VERSION="SVN r$REVISION"

		elif [ $SCM = git-svn ] ; then

			DEVEL_VERSION="SVN r$REVISION (via git)"

		elif [ $SCM = git ] ; then

			DEVEL_VERSION="Revision: ${REVISION}\\\\nBranch: ${BRANCH}\\\\nRevision ID: ${REVISION_ID}"

		elif [ $SCM = manual ] ; then

			DEVEL_VERSION="$REVISION (manually configured)"

		fi

	fi

fi

# Output the header

if [ x != "x$DEVEL_VERSION" ] ; then

	printf "#define DEVEL_VERSION \"$DEVEL_VERSION\"\n" > "$HEADER"

fi