mirror of
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270 lines
9.6 KiB
Python
270 lines
9.6 KiB
Python
"""Example Python hooks for ELinks.
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If ELinks is compiled with an embedded Python interpreter, it will try
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to import a Python module called hooks when the browser starts up. To
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use Python code from within ELinks, create a file called hooks.py in
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the ~/.elinks directory, or in the system-wide configuration directory
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(defined when ELinks was compiled), or in the standard Python search path.
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An example hooks.py file can be found in the contrib/python directory of
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the ELinks source distribution.
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The hooks module may implement any of several functions that will be
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called automatically by ELinks in appropriate circumstances; it may also
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bind ELinks keystrokes to callable Python objects so that arbitrary Python
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code can be invoked at the whim of the user.
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Functions that will be automatically called by ELinks (if they're defined):
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follow_url_hook() -- Rewrite a URL for a link that's about to be followed.
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goto_url_hook() -- Rewrite a URL received from a "Go to URL" dialog box.
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pre_format_html_hook() -- Rewrite a document's body before it's formatted.
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proxy_for_hook() -- Determine what proxy server to use for a given URL.
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quit_hook() -- Clean up before ELinks exits.
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"""
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import elinks
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from importlib import reload
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dumbprefixes = {
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"7th" : "http://7thguard.net/",
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"b" : "http://babelfish.altavista.com/babelfish/tr/",
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"bz" : "http://bugzilla.elinks.cz/",
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"bug" : "http://bugzilla.elinks.cz/",
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"d" : "http://www.dict.org/",
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"g" : "http://www.google.com/",
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"gg" : "http://www.google.com/",
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"go" : "http://www.google.com/",
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"fm" : "http://www.freshmeat.net/",
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"sf" : "http://www.sourceforge.net/",
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"dbug" : "http://bugs.debian.org/",
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"dpkg" : "http://packages.debian.org/",
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"pycur" : "http://www.python.org/doc/current/",
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"pydev" : "http://www.python.org/dev/doc/devel/",
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"pyhelp" : "http://starship.python.net/crew/theller/pyhelp.cgi",
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"pyvault" : "http://www.vex.net/parnassus/",
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"e2" : "http://www.everything2.org/",
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"sd" : "http://www.slashdot.org/"
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}
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def goto_url_hook(url):
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"""Rewrite a URL that was entered in a "Go to URL" dialog box.
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This function should return a string containing a URL for ELinks to
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follow, or an empty string if no URL should be followed, or None if
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ELinks should follow the original URL.
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Arguments:
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url -- The URL provided by the user.
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"""
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if url in dumbprefixes:
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return dumbprefixes[url]
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def follow_url_hook(url):
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"""Rewrite a URL for a link that's about to be followed.
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This function should return a string containing a URL for ELinks to
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follow, or an empty string if no URL should be followed, or None if
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ELinks should follow the original URL.
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Arguments:
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url -- The URL of the link.
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"""
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google_redirect = 'http://www.google.com/url?sa=D&q='
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if url.startswith(google_redirect):
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return url.replace(google_redirect, '')
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def pre_format_html_hook(url, html):
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"""Rewrite the body of a document before it's formatted.
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This function should return a string for ELinks to format, or None
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if ELinks should format the original document body. It can be used
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to repair bad HTML, alter the layout or colors of a document, etc.
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Arguments:
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url -- The URL of the document.
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html -- The body of the document.
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"""
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if "cygwin.com" in url:
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return html.replace('<body bgcolor="#000000" color="#000000"',
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'<body bgcolor="#ffffff" color="#000000"')
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elif url.startswith("https://www.mbank.com.pl/ib_navibar_3.asp"):
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return html.replace('<td valign="top"><img',
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'<tr><td valign="top"><img')
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def proxy_for_hook(url):
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"""Determine what proxy server to use for a given URL.
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This function should return a string of the form "hostname:portnumber"
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identifying a proxy server to use, or an empty string if the request
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shouldn't use any proxy server, or None if ELinks should use its
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default proxy server.
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Arguments:
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url -- The URL that is about to be followed.
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"""
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pass
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def quit_hook():
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"""Clean up before ELinks exits.
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This function should handle any clean-up tasks that need to be
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performed before ELinks exits. Its return value is ignored.
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"""
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pass
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# The rest of this file demonstrates some of the functionality available
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# within hooks.py through the embedded Python interpreter's elinks module.
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# Full documentation for the elinks module (as well as the hooks module)
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# can be found in doc/python.txt in the ELinks source distribution.
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# This class shows how to use elinks.input_box() and elinks.open(). It
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# creates a dialog box to prompt the user for a URL, and provides a callback
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# function that opens the URL in a new tab.
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#
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class goto_url_in_new_tab:
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"""Prompter that opens a given URL in a new tab."""
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def __init__(self):
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"""Prompt for a URL."""
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elinks.input_box("Enter URL", self._callback, title="Go to URL")
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def _callback(self, url):
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"""Open the given URL in a new tab."""
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if 'goto_url_hook' in globals():
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# Mimic the standard "Go to URL" dialog by calling goto_url_hook().
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url = goto_url_hook(url) or url
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if url:
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elinks.open(url, new_tab=True)
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# The elinks.bind_key() function can be used to create a keystroke binding
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# that will instantiate the class.
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#
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elinks.bind_key("Ctrl-g", goto_url_in_new_tab)
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# This class can be used to enter arbitrary Python expressions for the embedded
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# interpreter to evaluate. (Note that it can only evalute Python expressions,
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# not execute arbitrary Python code.) The callback function will use
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# elinks.info_box() to display the results.
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#
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class simple_console:
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"""Simple console for passing expressions to the Python interpreter."""
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def __init__(self):
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"""Prompt for a Python expression."""
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elinks.input_box("Enter Python expression", self._callback, "Console")
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def _callback(self, input):
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"""Evalute input and display the result (unless it's None)."""
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if input is None:
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# The user canceled.
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return
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result = eval(input)
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if result is not None:
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elinks.info_box(result, "Result")
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elinks.bind_key("F5", simple_console)
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# If you edit ~/.elinks/hooks.py while the browser is running, you can use
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# this function to make your changes take effect immediately (without having
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# to restart ELinks).
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#
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def reload_hooks():
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"""Reload the ELinks Python hooks."""
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import hooks
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reload(hooks)
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elinks.bind_key("F6", reload_hooks)
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# This example demonstrates how to create a menu by providing a sequence of
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# (string, function) tuples specifying each menu item.
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#
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def menu():
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"""Let the user choose from a menu of Python functions."""
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items = (
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("~Go to URL in new tab", goto_url_in_new_tab),
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("Simple Python ~console", simple_console),
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("~Reload Python hooks", reload_hooks),
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("Read my favorite RSS/ATOM ~feeds", feedreader),
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)
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elinks.menu(items)
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elinks.bind_key("F4", menu)
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# Finally, a more elaborate demonstration: If you install the add-on Python
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# module from http://feedparser.org/ this class can use it to parse a list
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# of your favorite RSS/ATOM feeds, figure out which entries you haven't seen
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# yet, open each of those entries in a new tab, and report statistics on what
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# it fetched. The class is instantiated by pressing the "!" key.
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#
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# This class demonstrates the elinks.load() function, which can be used to
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# load a document into the ELinks cache without displaying it to the user;
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# the document's contents are passed to a Python callback function.
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my_favorite_feeds = (
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"http://rss.gmane.org/messages/excerpts/gmane.comp.web.elinks.user",
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# ... add any other RSS or ATOM feeds that interest you ...
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# "http://elinks.cz/news.rss",
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# "http://www.python.org/channews.rdf",
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)
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class feedreader:
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"""RSS/ATOM feed reader."""
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def __init__(self, feeds=my_favorite_feeds):
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"""Constructor."""
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if elinks.home is None:
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raise elinks.error("Cannot identify unread entries without "
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"a ~/.elinks configuration directory.")
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self._results = {}
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self._feeds = feeds
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for feed in feeds:
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elinks.load(feed, self._callback)
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def _callback(self, header, body):
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"""Read a feed, identify unseen entries, and open them in new tabs."""
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import anydbm
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import feedparser # you need to get this module from feedparser.org
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import os
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if not body:
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return
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seen = anydbm.open(os.path.join(elinks.home, "rss.seen"), "c")
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feed = feedparser.parse(body)
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new = 0
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errors = 0
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for entry in feed.entries:
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try:
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if not seen.has_key(entry.link):
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elinks.open(entry.link, new_tab=True)
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seen[entry.link] = ""
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new += 1
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except:
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errors += 1
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seen.close()
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self._tally(feed.channel.title, new, errors)
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def _tally(self, title, new, errors):
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"""Record and report feed statistics."""
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self._results[title] = (new, errors)
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if len(self._results) == len(self._feeds):
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feeds = self._results.keys()
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feeds.sort()
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width = max([len(title) for title in feeds])
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fmt = "%*s new entries: %2d errors: %2d\n"
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summary = ""
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for title in feeds:
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new, errors = self._results[title]
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summary += fmt % (-width, title, new, errors)
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elinks.info_box(summary, "Feed Statistics")
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elinks.bind_key("!", feedreader)
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