#! /bin/sh
### -*-sh-*-
###
### Make autoconf-like substitutions in files
###
### (c) 2008 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of the Common Files Distribution (`common').
###
### `Common' 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.
###
### `Common' 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 `common'; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

set -e
VERSION="@VERSION@"

###--------------------------------------------------------------------------
### Parse command line arguments.

while [ $# -gt 0 ]; do
  case $1 in
    -h | --h | --he | --hel | --help)
      cat <<EOF
Usage: auto-verison

Writes on standard output the program's version number.
EOF
      exit 0
      ;;
    -v | --v | --ve | --ver | --vers | --versi | --versio | --version)
      echo "auto-version: Common Files Distribution version $VERSION"
      exit 0
      ;;
    --)
      shift
      break
      ;;
    -)
      break
      ;;
    -*)
      echo "auto-version: unknown option \`$1'" >&2
      exit 1
      ;;
    *)
      break
      ;;
  esac
  shift
done

if [ $# -ne 0 ]; then
  echo >&2 "Usage: auto-version"
  exit 1
fi

###--------------------------------------------------------------------------
### Main program.

## If this is a Git checkout then Git should be able to identify the version.
## If there's also a Debian version, and that ends in a `~', then prefix the
## Git version with this.  Note that `pkg-config' is not very good, and, in
## particular, doesn't support the convention that `~' sorts before anything
## else, even the empty string, despite claiming to implement the RPM
## version-comparison algorithm which specifies this behaviour, so one must
## be careful when choosing `~' prefixes.
if [ -e .git ] && version=$(git describe --abbrev=4 --dirty=+ 2>/dev/null); then
  debver=$(sed -n '/^.*(\(.*\)).*$/ { s::\1:p; q; }' debian/changelog)
  case $debver in *~) version=$debver$version ;; esac
  echo "$version"
  exit 0
fi

## If this was unpacked from a source distribution, the RELEASE file sould
## say what the version was.
if [ -f RELEASE ]; then
  cat RELEASE
  exit 0
fi

## If we're Debianized, then the Debian changelog ought to know.
if [ -f debian/changelog ]; then
  sed -n '/^.*(\(.*\)).*$/ { s::\1:p; q; }' debian/changelog
  exit 0
fi

## Otherwise we're screwed.
echo UNKNOWN
exit 0

###----- That's all, folks --------------------------------------------------