#!/bin/sh

# adapted from the GIT-VERSION-GEN from GIT: http://git.or.cz/

# MIRA
# On MASTER branch or branches called "rel_*"
#
# Take the last available tag as base, add "-dirty" if dirty,
#  then the rest of the git string where the number of commits
#  is separated via "_" and the SHA string with "+"
#   3.9.0-2-g86793f6  --->  3.9.0_2+g86793f6
#
# When "isshort" is given, then the part after the "+" is cut
#  away (for e.g. tarball package names), _0 is also cut away
#  if present at the end
#
#
# All other branches: pure git describe string from "git --all --long"
#  develop-2-g86793f6
#
# That is, as there is no "+", the short name is exactly the same

# Copyright (C) 2007-2009 Free Software Foundation
#
# 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 3 of the License, or
# (at your option) any later version.
#
# This program 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.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This script is derived from GIT-VERSION-GEN from GIT: http://git.or.cz/.
# It may be run two ways:
# - from a git repository in which the "git describe" command below
#   produces useful output (thus requiring at least one signed tag)
# - from a non-git-repo directory containing a .tarball-version file, which
#   presumes this script is invoked like "./git-version-gen .tarball-version".

# In order to use intra-version strings in your project, you will need two
# separate generated version string files:
#
# .tarball-version - present only in a distribution tarball, and not in
#   a checked-out repository.  Created with contents that were learned at
#   the last time autoconf was run, and used by git-version-gen.  Must not
#   be present in either $(srcdir) or $(builddir) for git-version-gen to
#   give accurate answers during normal development with a checked out tree,
#   but must be present in a tarball when there is no version control system.
#   Therefore, it cannot be used in any dependencies.  GNUmakefile has
#   hooks to force a reconfigure at distribution time to get the value
#   correct, without penalizing normal development with extra reconfigures.
#
# .version - present in a checked-out repository and in a distribution
#   tarball.  Usable in dependencies, particularly for files that don't
#   want to depend on config.h but do want to track version changes.
#   Delete this file prior to any autoconf run where you want to rebuild
#   files to pick up a version string change; and leave it stale to
#   minimize rebuild time after unrelated changes to configure sources.
#
# It is probably wise to add these two files to .gitignore, so that you
# don't accidentally commit either generated file.
#
# Use the following line in your configure.ac, so that $(VERSION) will
# automatically be up-to-date each time configure is run (and note that
# since configure.ac no longer includes a version string, Makefile rules
# should not depend on configure.ac for version updates).
#
# AC_INIT([GNU project],
#         m4_esyscmd([build-aux/git-version-gen .tarball-version]),
#         [bug-project@example])
#
# Then use the following lines in your Makefile.am, so that .version
# will be present for dependencies, and so that .tarball-version will
# exist in distribution tarballs.
#
# BUILT_SOURCES = $(top_srcdir)/.version
# $(top_srcdir)/.version:
#	echo $(VERSION) > $@-t && mv $@-t $@
# dist-hook:
#	echo $(VERSION) > $(distdir)/.tarball-version

case $# in
    1) tarball_version_file=$1; isshort=0;;
    2) tarball_version_file=$2; isshort=1;;
    *) echo 1>&2 "Usage: $0 [isshort] \$srcdir/.tarball-version"; exit 1;;
esac

nl='
'

# First see if there is a tarball-only version file.
# then try "git describe", then default.
if test -f $tarball_version_file
then
    v=`cat $tarball_version_file` || exit 1
    case $v in
	*$nl*) v= ;; # reject multi-line output
	[0-9a-zA-Z\-\.]*) ;; # accept only this
	*) v= ;; # reject all else
    esac
    test -z "$v" \
	&& echo "$0: WARNING: $tarball_version_file seems to be damaged" 1>&2

    case "$isshort" in
	0) ;;
	1) v=`echo "$v" | sed -e 's/\+.*$//' -e 's/_0$//'` ;;
    esac
fi

if test -n "$v"
then
    : # use $v
#elif test -d .git \
#    && v=`git describe --all --long 2>/dev/null`
elif v=`git describe --all --long 2>/dev/null`
then
    # remove heads/ etc.
    v=`echo "$v" | sed 's/.*\///'`

    # Is this a new git that lists number of commits since the last
    # tag or the previous older version that did not?
    #   Newer: v6.10-77-g0f8faeb
    #   Older: v6.10-g0f8faeb
    case $v in
	*-*-*) : git describe is okay three part flavor ;;
	*-*)
	    : git describe is older two part flavor
	    # Recreate the number of commits and rewrite such that the
	    # result is the same as if we were using the newer version
	    # of git describe.
	    vtag=`echo "$v" | sed 's/-.*//'`
	    numcommits=`git rev-list "$vtag"..HEAD | wc -l`
	    v=`echo "$v" | sed "s/\(.*\)-\(.*\)/\1-$numcommits-\2/"`;
	    ;;
    esac

    b=`git status -s -b | head -1 | cut -f 2 -d ' ' 2>/dev/null`

    # on master?
    case $b in
	master* | rel_*)
	    : we are on master or release branch
	    # then use version taken from tag version of git describe.
	    v=`git describe --long --tags 2>/dev/null`
	    # transform V340-1-g80816de to V340_1+...
	    v=`echo "$v" | sed -e 's/-/_/' | sed -e 's/-/+/'`
	    ;;
    esac

else
    v=UNKNOWN
fi

v=`echo "$v" |sed 's/^v//'`

case "$isshort" in
    0) ;;
    1) v=`echo "$v" | sed -e 's/\+.*$//' -e 's/_0$//'` ;;
esac


# Don't declare a version "dirty" merely because a time stamp has changed.
git status > /dev/null 2>&1

dirty=`sh -c 'git diff-index --name-only HEAD' 2>/dev/null` || dirty=
case "$dirty" in
    '') ;;
    *) # Append the suffix only if there isn't one already.
	case $v in
	  *-dirty) ;;
	  *) v="$v-dirty" ;;
	esac ;;
esac

# Omit the trailing newline, so that m4_esyscmd can use the result directly.
echo "$v" | tr -d '\012'
