add --css option. park gtkrc as deprecated

src/main.c

@@ -746,10 +746,26 @@ main (gint argc, gchar ** argv)
     is_x11 = TRUE;
 #endif
 
-  /* parse custom gtkrc */
-  if (options.gtkrc_file)
+  /* parse custom css */
+  if (options.css)
     {
       GtkCssProvider *css = gtk_css_provider_new ();
+
+      if (g_file_test (options.css, G_FILE_TEST_EXISTS))
+        gtk_css_provider_load_from_path (css, options.css, NULL);
+      else
+        gtk_css_provider_load_from_data (css, options.css, -1, NULL);
+      gtk_style_context_add_provider_for_screen (gdk_screen_get_default (), GTK_STYLE_PROVIDER (css),
+                                                 GTK_STYLE_PROVIDER_PRIORITY_USER);
+      g_object_unref (css);
+    }
+  else if (options.gtkrc_file)
+    {
+      GtkCssProvider *css = gtk_css_provider_new ();
+
+      if (options.debug)
+        g_printerr (_("WARNING: Using gtkrc option is deprecated, please use --css instead\n"));
+
       gtk_css_provider_load_from_path (css, options.gtkrc_file, NULL);
       gtk_style_context_add_provider_for_screen (gdk_screen_get_default (), GTK_STYLE_PROVIDER (css),
                                                  GTK_STYLE_PROVIDER_PRIORITY_USER);

src/option.c

@@ -660,8 +660,10 @@ static GOptionEntry misc_options[] = {
   { "show-themes", 0, 0, G_OPTION_ARG_NONE, &themes_mode,
     N_("Show list of GtkSourceView themes"), NULL },
 #endif
+  { "css", 0, 0, G_OPTION_ARG_STRING, &options.css,
+    N_("Load additional CSS settings from file or string"), N_("STRING") },
   { "gtkrc", 0, 0, G_OPTION_ARG_FILENAME, &options.gtkrc_file,
-    N_("Load additional GTK settings from file"), N_("FILENAME") },
+    N_("Load additional CSS settings from file"), N_("FILENAME") },
   { "hscroll-policy", 0, 0, G_OPTION_ARG_CALLBACK, set_scroll_policy,
     N_("Set policy for horizontal scrollbars (auto, always, never)"), N_("TYPE") },
   { "vscroll-policy", 0, 0, G_OPTION_ARG_CALLBACK, set_scroll_policy,
@@ -1465,6 +1467,7 @@ yad_options_init (void)
   options.mode = YAD_MODE_MESSAGE;
   options.rest_file = NULL;
   options.extra_data = NULL;
+  options.css = NULL;
   options.gtkrc_file = NULL;
 #ifndef G_OS_WIN32
   options.kill_parent = 0;

src/yad.h

@@ -525,6 +525,7 @@ typedef struct {
   YadSourceData source_data;
 #endif
 
+  gchar *css;
   gchar *gtkrc_file;
 
   GtkPolicyType hscroll_policy;