API support to write plugins for marking the file with custom labels/ decorating its bar with signs

I would like to find a plugin very useful which can run a command in behind to check the current file's custom attributes, this is like integrating sublime with other tools like perforce when I can check a file out for editing in my plugin but I can't mark that file with custom signs/labels to indicate that its already checked out (something like the option dirty, just controlled by my plugin I would create and not cleared when saving).

Thank you