Move the version to libknot/version.h, use awk/sed/shell to get the version number

configure.ac

@@ -4,7 +4,7 @@ AC_PREREQ([2.60])
 AC_CONFIG_SRCDIR([src/knot/main.c])
 
 # We extract version numbers from src/libknot/libknot.h
-define([gv],[perl ./getver.pl ]$1 ./src/libknot/libknot.h)
+define([gv],[./getver.sh ]$1)
 m4_define([libknot_MAJOR],esyscmd(gv(MAJOR)))dnl
 m4_define([libknot_MINOR],esyscmd(gv(MINOR)))dnl
 m4_define([libknot_REVISION],esyscmd(gv(RELEASE)))dnl

getver.pl

-#!/usr/bin/env perl
-
-# Simple script to extract the version number parts from
-# src/libknot/libknot.h.  If called with the middle word of the
-# version macro, it prints the value of that macro.  If called with no
-# argument, it outputs a human-readable version string.  This must be
-# run in the project root.  It is used by configure.ac and
-# docs/naturaldocs/run_docs.sh.
-
-use strict;
-
-my $key = shift;
-my $file = shift;
-my @version_parts = ();
-
-open FH, "<$file"   # old-style filehandle for max. portability
-  or die "Unable to open 'src/libknot/libknot.h' for reading.\n";
-
-while(<FH>) {
-  next unless m{versiong3d31a91};
-  next unless /^#define\s+LIBKNOT_([A-Z0-9]+)_VERSION+\s+(\S+)/;
-  my ($lk, $lv) = ($1, $2);
-  if ($lk eq $key) {
-    chomp $lv;
-    $lv =~ s/"//g;
-
-    print $lv;   # no newline
-    exit(0);    # success!
-  }
-
-  push @version_parts, $lv if (!$key);
-}
-
-close(FH);
-
-if (scalar @version_parts == 4) {
-  my $result = join(".", @version_parts[0..2]);
-  $result .= $version_parts[3];
-  $result =~ s/"//g;
-  print $result;
-  exit(0);
-}
-
-exit(1);        # failure

getver.sh

+#!/bin/sh
+echo -n $(awk '/^#define LIBKNOT_'$1'_VERSION/ { print $3 }' src/libknot/version.h | sed -e 's/"//g')

src/libknot/libknot.h

@@ -26,16 +26,7 @@
 
 #pragma once
 
-/* Version information.  This gets parsed by build scripts as well as
- * gcc so each #define line in this group must also be splittable on
- * whitespace, take the form LIBKNOT_*_VERSION and contain the magical
- * trailing comment. */
-#define LIBKNOT_MAJOR_VERSION    2           /*versiong3d31a91*/
-#define LIBKNOT_MINOR_VERSION    1           /*versiong3d31a91*/
-#define LIBKNOT_RELEASE_VERSION  0           /*versiong3d31a91*/
-#define LIBKNOT_EXTRA_VERSION    "-dev"      /*versiong3d31a91*/
-/* End parsable section. */
-
+#include "libknot/version.h"
 #include "libknot/binary.h"
 #include "libknot/codes.h"
 #include "libknot/consts.h"

src/libknot/version.h

+/*!
+ * \file libknot.h
+ *
+ * \author Ondřej Surý <ondrej.sury@nic.cz>
+ *
+ * \brief Convenience header with version number
+ *
+ * \addtogroup libknot
+ * @{
+ */
+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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/>.
+ */
+
+#pragma once
+
+/* Version information.  This gets parsed by build scripts as well as
+ * gcc so each #define line in this group must also be splittable on
+ * whitespace, take the form LIBKNOT_*_VERSION and contain the magical
+ * trailing comment. */
+#define LIBKNOT_MAJOR_VERSION    2           /*versiong3d31a91*/
+#define LIBKNOT_MINOR_VERSION    1           /*versiong3d31a91*/
+#define LIBKNOT_RELEASE_VERSION  0           /*versiong3d31a91*/
+#define LIBKNOT_EXTRA_VERSION    "-dev"      /*versiong3d31a91*/
+/* End parsable section. */
+
+/*! @} */