xF: add a binding to open the last link

Better than nothing.

xF.c

@@ -274,6 +274,7 @@ enum action
 	ACTION_LOG,
 	ACTION_EDIT_INPUT,
 	ACTION_VIEW_TRANSCRIPT,
+	ACTION_OPEN,
 	ACTION_FORMAT,
 	ACTION_FORMAT_BOLD,
 	ACTION_FORMAT_ITALIC,
@@ -3498,6 +3499,34 @@ app_open (const char *object)
 		;
 }
 
+static bool
+app_open_link (struct buffer_line_item *item)
+{
+	if (!(item->style & BUFFER_LINE_ITEM_LINK_START))
+		return false;
+
+	struct str link = str_make ();
+	do str_append (&link, item->text);
+	while ((item = item->next) && item->style & BUFFER_LINE_ITEM_LINK);
+	app_open (link.str);
+	str_free (&link);
+	return true;
+}
+
+static bool
+app_open_last_link (void)
+{
+	if (!g.buffer_current)
+		return false;
+
+	struct buffer *b = g.buffer_current;
+	LIST_FOR_EACH_REVERSED (struct buffer_line, line, b->lines_tail)
+		LIST_FOR_EACH (struct buffer_line_item, item, line->items)
+			if (app_open_link (item))
+				return true;
+	return false;
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 static char *
@@ -3834,6 +3863,8 @@ app_process_action (enum action action)
 		return app_launch_external_editor (false);
 	case ACTION_VIEW_TRANSCRIPT:
 		return app_launch_external_editor (true);
+	case ACTION_OPEN:
+		return app_open_last_link ();
 	case ACTION_FORMAT:
 		g.inserting_attribute = true;
 		return true;
@@ -3998,6 +4029,7 @@ g_default_bindings[] =
 	{ "M-h",        ACTION_LOG                    },
 	{ "M-e",        ACTION_EDIT_INPUT             },
 	{ "M-E",        ACTION_VIEW_TRANSCRIPT        },
+	{ "C-o",        ACTION_OPEN                   },
 	{ "M-m",        ACTION_FORMAT                 },
 	{ "PageUp",     ACTION_SCROLL_UP              },
 	{ "PageDown",   ACTION_SCROLL_DOWN            },