theme: Allow disabling fallback colors in gtk:custom()

fmuellner · vkareh · commit 6203779411c9 · 2018-08-28T09:38:37.000-04:00
gtk:custom() requires a fallback color in case the GTK+ theme in use does not define the desired color. As in general the fallback color will approximate the intended color, there is the risk of typos going unnoticed. To make catching these kind of errors easier, allow to ignore the fallback color specified (and fall back to a nice shade of pink instead) by setting an environment variable. https://bugzilla.gnome.org/show_bug.cgi?id=656112
diff --git a/src/ui/theme.c b/src/ui/theme.c
@@ -1170,8 +1170,15 @@ meta_color_spec_new_from_string (const char *str,
       str[8] == 'o' && str[9] == 'm')
     {
       const char *color_name_start, *fallback_str_start, *end;
-      char *color_name, *fallback_str;
+      char *color_name;
       MetaColorSpec *fallback = NULL;
+      static gboolean debug, debug_set = FALSE;
+
+      if (!debug_set)
+        {
+          debug = g_getenv ("MUTTER_DISABLE_FALLBACK_COLOR") != NULL;
+          debug_set = TRUE;
+        }
 
       if (str[10] != '(')
         {
@@ -1212,9 +1219,18 @@ meta_color_spec_new_from_string (const char *str,
           return NULL;
         }
 
-      fallback_str = g_strndup (fallback_str_start, end - fallback_str_start);
-      fallback = meta_color_spec_new_from_string (fallback_str, err);
-      g_free (fallback_str);
+      if (!debug)
+        {
+          char *fallback_str;
+          fallback_str = g_strndup (fallback_str_start,
+                                    end - fallback_str_start);
+          fallback = meta_color_spec_new_from_string (fallback_str, err);
+          g_free (fallback_str);
+        }
+      else
+        {
+          fallback = meta_color_spec_new_from_string ("pink", err);
+        }
 
       if (fallback == NULL)
         return NULL;
