refactor: add shell version to command line option

meson.build

@@ -12,6 +12,7 @@ add_project_arguments(
         '-Wno-pedantic',
         '-Werror=implicit-function-declaration',
         '-Werror=return-type',
+        '-D__SHELL_VERSION__="@0@"'.format(meson.project_version())
     ],
     language: 'c')
 

src/shell.c

@@ -423,6 +423,21 @@ static void diya_shell_class_init(DiyaShellClass *class)
                  G_TYPE_UINT);
 }
 
+static int diya_shell_handle_local_options(GApplication *application, GVariantDict *options, gpointer user_data)
+{
+    (void) application;
+    (void) user_data;
+#ifdef __SHELL_VERSION__
+    guint32 count;
+    if (g_variant_dict_lookup(options, "version", "b", &count))
+    {
+        g_print("Shell version: %s\n", __SHELL_VERSION__);
+        return EXIT_SUCCESS;
+    }
+#endif
+    return -1;
+}
+
 int diya_shell_run(DiyaShell *shell, int argc, char **argv)
 {
     DiyaShellPrivate *priv = diya_shell_get_instance_private(shell);
@@ -440,7 +455,22 @@ int diya_shell_run(DiyaShell *shell, int argc, char **argv)
     gchar *path = g_strconcat(g_get_user_config_dir(), "/diya/xkb/", NULL);
     g_mkdir_with_parents((const gchar *)path, 0755);
     g_free(path);
-
+    const GOptionEntry cmd_params[] =
+        {
+#ifdef __SHELL_VERSION__
+            {
+                .long_name = "version",
+                .short_name = 'v',
+                .flags = G_OPTION_FLAG_NONE,
+                .arg = G_OPTION_ARG_NONE,
+                .arg_data = NULL,
+                .description = "Show version information",
+                .arg_description = NULL,
+            },
+#endif
+            {NULL}};
+    g_application_add_main_option_entries(G_APPLICATION(app), cmd_params);
+    g_signal_connect(app, "handle-local-options", G_CALLBACK(diya_shell_handle_local_options), shell);
     int status = g_application_run(G_APPLICATION(app), argc, argv);
     g_object_unref(app);
     return status;