mdw@git.distorted.org.uk Git - runlisp/blob - m4/mdw-auto-version.m4

   1 dnl -*-autoconf-*-
   2
   3 ### SYNOPSIS
   4 ###
   5 ###   mdw_AUTO_VERSION
   6 ###
   7 ### DESCRIPTION
   8 ###
   9 ###   Defines an m4 macro `AUTO_VERSION' which contains the current package's
  10 ###   version number, worked out in some clever way.
  11 ###
  12 ###   The heavy lifting is performed by the `auto-version' script (q.v.).  In
  13 ###   brief:
  14 ###
  15 ###     * if this is a Git working tree (i.e., there is a `.git' file or
  16 ###       directory at toplevel) then call `git describe' and use its output;
  17 ###
  18 ###     * if there is a `RELEASE' file, then use its contents literally;
  19 ###
  20 ###     * if there is a `debian/changelog' file, then use the most recent
  21 ###       entry's version number;
  22 ###
  23 ###     * otherwise use `UNKNOWN'.
  24 ###
  25 ### LICENSE
  26 ###
  27 ###   Copyright (c) 2008 Mark Wooding <mdw@distorted.org.uk>
  28 ###
  29 ###   This program is free software: you can redistribute it and/or modify it
  30 ###   under the terms of the GNU General Public License as published by the
  31 ###   Free Software Foundation, either version 2 of the License, or (at your
  32 ###   option) any later version.
  33 ###
  34 ###   This program is distributed in the hope that it will be useful, but
  35 ###   WITHOUT ANY WARRANTY; without even the implied warranty of
  36 ###   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  37 ###   General Public License for more details.
  38 ###
  39 ###   You should have received a copy of the GNU General Public License along
  40 ###   with this program. If not, see <http://www.gnu.org/licenses/>.
  41 ###
  42 ###   As a special exception, the respective Autoconf Macro's copyright owner
  43 ###   gives unlimited permission to copy, distribute and modify the configure
  44 ###   scripts that are the output of Autoconf when processing the Macro. You
  45 ###   need not follow the terms of the GNU General Public License when using
  46 ###   or distributing such scripts, even though portions of the text of the
  47 ###   Macro appear in them. The GNU General Public License (GPL) does govern
  48 ###   all other use of the material that constitutes the Autoconf Macro.
  49 ###
  50 ###   This special exception to the GPL applies to versions of the Autoconf
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  54
  55 # serial 1
  56 AC_DEFUN([mdw_AUTO_VERSION], [m4_define([AUTO_VERSION], m4_esyscmd([
  57   ver=UNKNOWN
  58   for pre in ./ config/; do
  59     for post in "" .in; do
  60       try=${pre}auto-version${post}
  61       if test -x $try; then ver=$("$try"); break; fi
  62     done
  63   done
  64   echo -n "$ver"
  65 ]))])