import re
import plugin

available = ['LaunchpadURLHandler']

class URLHandler(plugin.Plugin):
    """Base class for URL handlers"""
    capabilities = ['url_handler']
    handler_name = None
    match = None

    def callback(self, url):
        raise NotImplementedError

class LaunchpadURLHandler(URLHandler):
    """Launchpad URL handler. If the URL looks like a Launchpad changelog
    closure entry... 'LP: #12345' then it should be transformed into a 
    Launchpad URL"""
    capabilities = ['url_handler']
    handler_name = 'launchpad'
    match = '\\bLP:? #?[0-9]+\\b'

    def callback(self, url):
        for item in re.findall(r'[0-9]+', url):
            url = 'https://bugs.launchpad.net/bugs/%s' % item
            return(url)