#!/bin/sh
# Print a version string.
scriptversion=2008-04-08.07

# Copyright (C) 2007-2008 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, 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

# 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

# Copyright (C) 2014 Carsten Burstedde
#
# With the new style of git submodules, .git may be a file: added test -f .git

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

srcdir=`dirname $1`
tarball_version_file=`basename $1`
nl='
'

# Change directory into the srcdir.  This should allow
# for out of source make dist.
cd $srcdir

# 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


if test -n "$v"
then
  : # use $v
elif { test -d .git || test -f .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=UNKNOWN
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:
