fset: add "t:themable" filter

Extend the "t:" filter so the special value "themable" matches every
option whose new themable flag is set, regardless of type (color,
string, integer, boolean, enum). This makes the flag interactively
discoverable in the fset buffer and is the natural way to inspect the
surface area that an upcoming /theme command will be allowed to touch.

The themable flag of an option is now mirrored on struct t_fset_option,
exposed via hdata ("themable", integer) and infolist ("themable",
integer), and printed in the log.

src/plugins/fset/fset-command.c

@@ -702,7 +702,9 @@ fset_command_init (void)
             N_("> `xxx`: show only options with \"xxx\" in name"),
             N_("> `f:xxx`: show only configuration file \"xxx\""),
             N_("> `t:xxx`: show only type \"xxx\" (bool/int/str/col/enum "
-               "or boolean/integer/string/color/enum)"),
+               "or boolean/integer/string/color/enum); the special value "
+               "\"themable\" matches all options with the themable flag, "
+               "regardless of type"),
             N_("> `d`: show only changed options"),
             N_("> `d:xxx`: show only changed options with \"xxx\" in "
                "name"),

src/plugins/fset/fset-option.c

@@ -335,6 +335,10 @@ fset_option_match_filter (struct t_fset_option *fset_option, const char *filter)
     }
     else if (strncmp (filter, "t:", 2) == 0)
     {
+        /* virtual cross-type value: match themable flag (any option type) */
+        if (weechat_strcasecmp (filter + 2, "themable") == 0)
+            return (fset_option->themable) ? 1 : 0;
+
         /* filter by type */
         return (
             (weechat_strcasecmp (
@@ -426,7 +430,7 @@ fset_option_set_values (struct t_fset_option *fset_option,
     const char **ptr_string_values;
     void *ptr_default_value, *ptr_value;
     struct t_config_option *ptr_parent_option;
-    int *ptr_type, *ptr_min, *ptr_max;
+    int *ptr_type, *ptr_themable, *ptr_min, *ptr_max;
     char str_value[64], str_allowed_values[4096];
 
     /* file */
@@ -466,6 +470,10 @@ fset_option_set_values (struct t_fset_option *fset_option,
     ptr_type = weechat_config_option_get_pointer (option, "type");
     fset_option->type = *ptr_type;
 
+    /* themable */
+    ptr_themable = weechat_config_option_get_pointer (option, "themable");
+    fset_option->themable = (ptr_themable) ? *ptr_themable : 0;
+
     /* default value */
     free (fset_option->default_value);
     fset_option->default_value = NULL;
@@ -784,6 +792,7 @@ fset_option_alloc (struct t_config_option *option)
     new_fset_option->name = NULL;
     new_fset_option->parent_name = NULL;
     new_fset_option->type = 0;
+    new_fset_option->themable = 0;
     new_fset_option->default_value = NULL;
     new_fset_option->value = NULL;
     new_fset_option->parent_value = NULL;
@@ -1691,6 +1700,7 @@ fset_option_hdata_option_cb (const void *pointer, void *data,
         WEECHAT_HDATA_VAR(struct t_fset_option, name, STRING, 0, NULL, NULL);
         WEECHAT_HDATA_VAR(struct t_fset_option, parent_name, STRING, 0, NULL, NULL);
         WEECHAT_HDATA_VAR(struct t_fset_option, type, INTEGER, 0, NULL, NULL);
+        WEECHAT_HDATA_VAR(struct t_fset_option, themable, INTEGER, 0, NULL, NULL);
         WEECHAT_HDATA_VAR(struct t_fset_option, default_value, STRING, 0, NULL, NULL);
         WEECHAT_HDATA_VAR(struct t_fset_option, value, STRING, 0, NULL, NULL);
         WEECHAT_HDATA_VAR(struct t_fset_option, parent_value, STRING, 0, NULL, NULL);
@@ -1740,6 +1750,8 @@ fset_option_add_to_infolist (struct t_infolist *infolist,
         return 0;
     if (!weechat_infolist_new_var_string (ptr_item, "type_en", fset_option_type_string[fset_option->type]))
         return 0;
+    if (!weechat_infolist_new_var_integer (ptr_item, "themable", fset_option->themable))
+        return 0;
     if (!weechat_infolist_new_var_string (ptr_item, "default_value", fset_option->default_value))
         return 0;
     if (!weechat_infolist_new_var_string (ptr_item, "value", fset_option->value))
@@ -1793,6 +1805,7 @@ fset_option_print_log (void)
         weechat_log_printf ("  type. . . . . . . . . : %d ('%s')",
                             ptr_fset_option->type,
                             fset_option_type_string[ptr_fset_option->type]);
+        weechat_log_printf ("  themable. . . . . . . : %d", ptr_fset_option->themable);
         weechat_log_printf ("  default_value . . . . : '%s'", ptr_fset_option->default_value);
         weechat_log_printf ("  value . . . . . . . . : '%s'", ptr_fset_option->value);
         weechat_log_printf ("  parent_value. . . . . : '%s'", ptr_fset_option->parent_value);

src/plugins/fset/fset-option.h

@@ -46,6 +46,7 @@ struct t_fset_option
     char *name;                          /* option full name: file.sect.opt */
     char *parent_name;                   /* parent option name              */
     enum t_fset_option_type type;        /* option type                     */
+    int themable;                        /* 1 if option is themable         */
     char *default_value;                 /* option default value            */
     char *value;                         /* option value                    */
     char *parent_value;                  /* parent option value             */