version-gen

#!/bin/sh
# Print a version string.
scriptversion=2010-04-08.19

# 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 autoconf.git:
# http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=blob_plain;f=build-aux/git-version-gen

# 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
    2) ;;
    *) echo 1>&2 "Usage: $0 DEFAULT_VERSION \$srcdir/.tarball-version"; exit 1;;
esac

default_version=$1
tarball_version_file=$2
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
	[0-9]*) ;;
	*) v= ;;
    esac
    test -z "$v" \
	&& echo "$0: WARNING: $tarball_version_file seems to be damaged" 1>&2
fi

# Check if this is a release version
if test -z `echo $default_version | tr '.' ' ' | cut -d' ' -f 4`
then
    v=$default_version
fi

if test -n "$v"
then
    : # use $v
elif test -d .svn \
    && v=`svnversion`
then
    v=$default_version-$v
    echo "$v" | tr -d '\012'
    exit 0
#elif test -d .git \
#    && v=`git describe --abbrev=4 --match='v*' HEAD 2>/dev/null \
#	  || git describe --abbrev=4 HEAD 2>/dev/null` \
#    && case $v in
#	 v[0-9]*) ;;
#	 *) (exit 1) ;;
#       esac
#then
#    # 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-$numcommits-\2/"`;
#	    ;;
#    esac
#
#    # Change the first '-' to a '.', so version-comparing tools work properly.
#    # Remove the "g" in git describe's output string, to save a byte.
#    v=`echo "$v" | sed 's/-/./;s/\(.*\)-g/\1-/'`;
else
    v=$default_version
fi

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

# 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'

# Local variables:
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-end: "$"
# End: