degesch: implement -=/+= for multiple values

It didn't make sense to have these unimplemented,
though perhaps += shouldn't enforce a set.

Sadly, autocomplete is fairly difficult for -= of multiple items.

NEWS

@@ -11,6 +11,8 @@
 
  * degesch: /deop and /devoice without arguments will use the client's user
 
+ * degesch: /set +=/-= now treats its argument as a string array
+
  * censor.lua: now stripping colours from censored messages;
    their attributes are also configurable rather than always black on black
 

degesch.c

@@ -11053,45 +11053,38 @@ handle_command_buffer (struct handler_args *a)
 	return result;
 }
 
-static bool
-replace_string_array
-	(struct config_item *item, struct strv *array, struct error **e)
-{
-	char *changed = strv_join (array, ",");
-	struct str tmp = { .str = changed, .len = strlen (changed) };
-	bool result = config_item_set_from (item,
-		config_item_string_array (&tmp), e);
-	free (changed);
-	return result;
-}
-
 static bool
 handle_command_set_add
-	(struct config_item *item, const char *value, struct error **e)
+	(struct strv *items, const struct strv *values, struct error **e)
 {
-	struct strv items = strv_make ();
+	for (size_t i = 0; i < values->len; i++)
-	if (item->type != CONFIG_ITEM_NULL)
-		cstr_split (item->value.string.str, ",", false, &items);
-	if (items.len == 1 && !*items.vector[0])
-		strv_reset (&items);
-
-	// FIXME: handle multiple items properly
-	bool result = false;
-	if (strv_find (&items, value) != -1)
-		error_set (e, "already present in the array: %s", value);
-	else
 	{
-		strv_append (&items, value);
+		const char *value = values->vector[i];
-		result = replace_string_array (item, &items, e);
+		if (strv_find (items, values->vector[i]) != -1)
+			return error_set (e, "already present in the array: %s", value);
+		strv_append (items, value);
 	}
-
+	return true;
-	strv_free (&items);
-	return result;
 }
 
 static bool
 handle_command_set_remove
-	(struct config_item *item, const char *value, struct error **e)
+	(struct strv *items, const struct strv *values, struct error **e)
+{
+	for (size_t i = 0; i < values->len; i++)
+	{
+		const char *value = values->vector[i];
+		ssize_t i = strv_find (items, value);
+		if (i == -1)
+			return error_set (e, "not present in the array: %s", value);
+		strv_remove (items, i);
+	}
+	return true;
+}
+
+static bool
+handle_command_set_modify
+	(struct config_item *item, const char *value, bool add, struct error **e)
 {
 	struct strv items = strv_make ();
 	if (item->type != CONFIG_ITEM_NULL)
@@ -11099,18 +11092,23 @@ handle_command_set_remove
 	if (items.len == 1 && !*items.vector[0])
 		strv_reset (&items);
 
-	// FIXME: handle multiple items properly
+	struct strv values = strv_make ();
-	bool result = false;
+	cstr_split (value, ",", false, &values);
-	ssize_t i = strv_find (&items, value);
+	bool result = add
-	if (i == -1)
+		? handle_command_set_add (&items, &values, e)
-		error_set (e, "not present in the array: %s", value);
+		: handle_command_set_remove (&items, &values, e);
-	else
+
+	if (result)
 	{
-		strv_remove (&items, i);
+		char *changed = strv_join (&items, ",");
-		result = replace_string_array (item, &items, e);
+		struct str tmp = { .str = changed, .len = strlen (changed) };
+		result = config_item_set_from (item,
+			config_item_string_array (&tmp), e);
+		free (changed);
 	}
 
 	strv_free (&items);
+	strv_free (&values);
 	return result;
 }
 
@@ -11129,10 +11127,8 @@ handle_command_set_assign_item (struct app_context *ctx,
 		config_item_set_from (item, config_item_clone (new_), &e);
 	else if (item->schema->type != CONFIG_ITEM_STRING_ARRAY)
 		error_set (&e, "not a string array");
-	else if (add)
+	else
-		handle_command_set_add (item, new_->value.string.str, &e);
+		handle_command_set_modify (item, new_->value.string.str, add, &e);
-	else if (remove)
-		handle_command_set_remove (item, new_->value.string.str, &e);
 
 	if (e)
 	{