229 lines
7 KiB
Python
229 lines
7 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2004-2005 Tristan Seligmann and Jonathan Jacobs
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import os
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import time
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import urllib
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import codecs
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from . import rss, util, configuration
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class EventHandler(object):
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"""Base class for writing events to files. The currently defined events are
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start(), comicDownloaded() and end()."""
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def __init__(self, basepath, baseurl):
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"""Initialize base path and url."""
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self.basepath = basepath
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self.baseurl = baseurl or self.getBaseUrl()
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def getBaseUrl(self):
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'''Return a file: URL that probably points to the basedir.
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This is used as a halfway sane default when the base URL is not
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provided; not perfect, but should work in most cases.'''
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components = util.splitpath(os.path.abspath(self.basepath))
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url = '/'.join([urllib.quote(component, '') for component in components])
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return 'file:///' + url + '/'
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def getUrlFromFilename(self, filename):
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"""Construct URL from filename."""
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components = util.splitpath(util.getRelativePath(self.basepath, filename))
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url = '/'.join([urllib.quote(component, '') for component in components])
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return self.baseurl + url
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def start(self):
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"""Emit a start event. Should be overridden in subclass."""
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pass
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def comicDownloaded(self, comic, filename):
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"""Emit a comic downloaded event. Should be overridden in subclass."""
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pass
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def end(self):
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"""Emit an end event. Should be overridden in subclass."""
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pass
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class RSSEventHandler(EventHandler):
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"""Output in RSS format."""
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name = 'rss'
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def getFilename(self):
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"""Return RSS filename."""
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return os.path.abspath(os.path.join(self.basepath, 'dailydose.rss'))
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def start(self):
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"""Log start event."""
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today = time.time()
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yesterday = today - 86400
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today = time.localtime(today)
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yesterday = time.localtime(yesterday)
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link = configuration.Url
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self.rssfn = self.getFilename()
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if os.path.exists(self.rssfn):
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self.newfile = False
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self.rss = rss.parseFeed(self.rssfn, yesterday)
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else:
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self.newfile = True
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self.rss = rss.Feed('Daily Dosage', link, 'Comics for %s' % time.strftime('%Y/%m/%d', today))
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def comicDownloaded(self, comic, filename):
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"""Write RSS entry for downloaded comic."""
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imageUrl = self.getUrlFromFilename(filename)
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title = '%s - %s' % (comic.name, os.path.basename(filename))
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pageUrl = comic.referrer
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description = '<img src="%s"/><br/><a href="%s">View Comic</a>' % (imageUrl, pageUrl)
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args = (
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title,
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imageUrl,
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description,
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util.rfc822date(time.time())
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)
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if self.newfile:
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self.newfile = False
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self.rss.addItem(*args)
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else:
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self.rss.addItem(*args, append=False)
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def end(self):
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"""Write RSS data to file."""
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self.rss.write(self.rssfn)
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class HtmlEventHandler(EventHandler):
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"""Output in HTML format."""
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name = 'html'
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def fnFromDate(self, date):
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"""Get filename from date."""
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fn = time.strftime('comics-%Y%m%d.html', date)
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fn = os.path.join(self.basepath, 'html', fn)
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fn = os.path.abspath(fn)
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return fn
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def start(self):
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"""Start HTML output."""
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today = time.time()
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yesterday = today - 86400
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tomorrow = today + 86400
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today = time.localtime(today)
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yesterday = time.localtime(yesterday)
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tomorrow = time.localtime(tomorrow)
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fn = self.fnFromDate(today)
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if os.path.exists(fn):
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raise ValueError('output file %r already exists' % fn)
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d = os.path.dirname(fn)
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if not os.path.isdir(d):
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os.makedirs(d)
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yesterdayUrl = self.getUrlFromFilename(self.fnFromDate(yesterday))
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tomorrowUrl = self.getUrlFromFilename(self.fnFromDate(tomorrow))
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self.html = codecs.open(fn, 'w', 'utf-8')
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self.html.write(u'''<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<meta name="generator" content="%s"/>
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<title>Comics for %s</title>
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</head>
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<body>
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<a href="%s">Previous Day</a> | <a href="%s">Next Day</a>
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<ul>
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''' % (configuration.App, time.strftime('%Y/%m/%d', today),
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yesterdayUrl, tomorrowUrl))
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# last comic name (eg. CalvinAndHobbes)
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self.lastComic = None
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# last comic strip URL (eg. http://example.com/page42)
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self.lastUrl = None
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def comicDownloaded(self, comic, filename):
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"""Write HTML entry for downloaded comic."""
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if self.lastComic != comic.name:
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self.newComic(comic)
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imageUrl = self.getUrlFromFilename(filename)
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pageUrl = comic.referrer
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if pageUrl != self.lastUrl:
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self.html.write(u'<li><a href="%s">%s</a>\n' % (pageUrl, pageUrl))
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self.html.write(u'<br/><img src="%s"/>\n' % imageUrl)
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self.lastComic = comic.name
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self.lastUrl = pageUrl
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def newComic(self, comic):
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"""Start new comic list in HTML."""
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if self.lastUrl is not None:
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self.html.write(u'</li>\n')
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if self.lastComic is not None:
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self.html.write(u'</ul>\n')
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self.html.write(u'<li>%s</li>\n' % comic.name)
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self.html.write(u'<ul>\n')
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def end(self):
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"""End HTML output."""
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if self.lastUrl is not None:
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self.html.write(u'</li>\n')
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if self.lastComic is not None:
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self.html.write(u'</ul>\n')
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self.html.write(u'''</ul>
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</body>
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</html>''')
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self.html.close()
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_handler_classes = {}
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def addHandlerClass(clazz):
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"""Register handler class."""
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if not issubclass(clazz, EventHandler):
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raise ValueError("%s must be subclassed from %s" % (clazz, EventHandler))
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_handler_classes[clazz.name] = clazz
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addHandlerClass(HtmlEventHandler)
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addHandlerClass(RSSEventHandler)
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def getHandlerNames():
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"""Get sorted handler names."""
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return sorted(_handler_classes.keys())
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_handlers = []
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def addHandler(name, basepath=None, baseurl=None):
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"""Install a global handler with given name."""
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if basepath is None:
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basepath = '.'
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_handlers.append(_handler_classes[name](basepath, baseurl))
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class MultiHandler(object):
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"""Encapsulate a list of handlers."""
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def start(self):
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"""Emit a start event. Should be overridden in subclass."""
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for handler in _handlers:
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handler.start()
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def comicDownloaded(self, comic, filename):
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"""Emit a comic downloaded event. Should be overridden in subclass."""
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for handler in _handlers:
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handler.comicDownloaded(comic, filename)
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def end(self):
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"""Emit an end event. Should be overridden in subclass."""
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for handler in _handlers:
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handler.end()
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multihandler = MultiHandler()
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def getHandler():
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"""Get installed event handler."""
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return multihandler
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