Simplify copyright year and add VCS version to dialogue

src/find_year.sh

-#!/bin/sh
-# SPDX-FileCopyrightText: 2018-2020 Bruce Cowan <bruce@bcowan.me.uk>
-#
-# SPDX-License-Identifier: CC0-1.0
-
-git log -1 --format=%cd --date=format:%Y

src/main.c

@@ -35,6 +35,7 @@ about_activated (GSimpleAction *simple,
                            "license-type", GTK_LICENSE_LGPL_3_0,
                            "authors", authors,
                            "comments", "Rugby scores possiblities program",
+                           "version", PACKAGE_VERSION,
                            NULL);
 }
 

src/meson.build

-# SPDX-FileCopyrightText: 2016-2018 Bruce Cowan <bruce@bcowan.me.uk>
+# SPDX-FileCopyrightText: 2016-2020 Bruce Cowan <bruce@bcowan.me.uk>
 #
 # SPDX-License-Identifier: CC0-1.0
 
@@ -9,8 +9,17 @@ conf.set('TRY_POINTS', get_option('try_points'))
 conf.set('UTRY_POINTS', get_option('utry_points'))
 conf.set('KICK_POINTS', get_option('kick_points'))
 
-year = run_command('find_year.sh').stdout().strip()
-conf.set_quoted('COPYRIGHT_YEAR', year)
+VCS_TAG = ''
+COPYRIGHT_YEAR = '?'
+
+git = find_program('git', required: false)
+if git.found()
+    VCS_TAG = run_command('git', 'rev-parse', '--short', 'HEAD').stdout().strip()
+    COPYRIGHT_YEAR = run_command('git', 'log', '-1', '--format=%cd', '--date=format:%Y').stdout().strip()
+endif
+
+conf.set_quoted('PACKAGE_VERSION', VCS_TAG)
+conf.set_quoted('COPYRIGHT_YEAR', COPYRIGHT_YEAR)
 
 config_h = configure_file(configuration: conf, output: 'config.h')