core: add support of full color option name in command /eval and API function string_eval_expression()

src/core/wee-eval.c

@@ -325,6 +325,9 @@ eval_replace_vars_cb (void *data, const char *text)
     /* 5. color code */
     if (strncmp (text, "color:", 6) == 0)
     {
+        ptr_value = gui_color_search_config (text + 6);
+        if (ptr_value)
+            return strdup (ptr_value);
         ptr_value = gui_color_get_custom (text + 6);
         return strdup ((ptr_value) ? ptr_value : "");
     }

src/gui/gui-color.h

@@ -22,6 +22,8 @@
 
 #include <regex.h>
 
+struct t_config_option;
+
 /*
  * Color from configuration options.
  * When changing some colors below:
@@ -173,6 +175,7 @@ extern struct t_weelist *gui_color_list_with_alias;
 
 /* color functions */
 
+extern const char *gui_color_from_option (struct t_config_option *option);
 extern const char *gui_color_search_config (const char *color_name);
 extern int gui_color_attr_get_flag (char c);
 extern void gui_color_attr_build_string (int color, char *str_attr);