157 lines
5.1 KiB
Python
157 lines
5.1 KiB
Python
# pylint: disable=C0111,R0903
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"""RSS news ticker
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Fetches rss news items and shows these as a news ticker.
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Left-clicking will open the full story in a browser.
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New stories are highlighted.
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Parameters:
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* rss.feeds : Space-separated list of RSS URLs
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* rss.length : Maximum length of the module, default is 60
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"""
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try:
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import feedparser
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DEPENDENCIES_OK = True
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except ImportError:
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DEPENDENCIES_OK = False
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import webbrowser
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import time
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import os
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import bumblebee.input
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import bumblebee.output
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import bumblebee.engine
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# pylint: disable=too-many-instance-attributes
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class Module(bumblebee.engine.Module):
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REFRESH_DELAY = 600
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SCROLL_SPEED = 3
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def __init__(self, engine, config):
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super(Module, self).__init__(engine, config,
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bumblebee.output.Widget(full_text=self.ticker_update)
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)
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# Use BBC newsfeed as demo:
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self._feeds = self.parameter('feeds', 'http://feeds.bbci.co.uk/news/rss.xml').split(" ")
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self._refresh_countdown = 0
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self._feeds_to_update = []
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self._max_title_length = int(self.parameter("length", 60))
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self._items = []
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self._current_item = None
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self._ticker_offset = 0
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self._pre_delay = 0
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self._post_delay = 0
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self._state = []
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engine.input.register_callback(self, button=bumblebee.input.LEFT_MOUSE, cmd=self._open)
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def _open(self, _):
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if self._current_item:
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webbrowser.open(self._current_item['link'])
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def _update_items_from_feed(self, url):
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parser = feedparser.parse(url)
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old_titles = [i['title'] for i in self._items if i['source'] == url]
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new_items = [{'title': i['title'].replace('\n', ' '),
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'link': i['link'],
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'new': i['title'] not in old_titles,
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'source': url,
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'published': time.mktime(i.published_parsed) if hasattr(i, 'published_parsed') else 0}
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for i in parser['entries']]
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# Remove the previous items
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self._items = [i for i in self._items if i['source'] != url]
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# Add the new items
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self._items.extend(new_items)
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# Sort the items on publish date
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self._items.sort(key=lambda i: i['published'], reverse=True)
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def _check_for_refresh(self):
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if not DEPENDENCIES_OK:
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self._items = [{'title': 'Please install feedparser first', 'new':True, 'published': 0,
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'link': 'https://pypi.org/project/feedparser/'}]
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self._current_item = self._items[0]
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elif self._feeds_to_update:
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# Update one feed at a time to not overload this update cycle
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url = self._feeds_to_update.pop()
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self._update_items_from_feed(url)
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if not self._current_item:
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self._next_item()
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elif self._refresh_countdown == 0:
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# Populate the list with feeds to update
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self._feeds_to_update = self._feeds[:]
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# Restart the update countdown timer
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self._refresh_countdown = self.REFRESH_DELAY
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else:
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self._refresh_countdown -= 1
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def _next_item(self):
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self._ticker_offset = 0
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self._pre_delay = 2
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self._post_delay = 4
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if not self._items:
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return
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# Index of the current element
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idx = self._items.index(self._current_item) if self._current_item in self._items else - 1
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# First show new items, else show next
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new_items = [i for i in self._items if i['new']]
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self._current_item = next(iter(new_items), self._items[(idx+1) % len(self._items)])
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def _check_scroll_done(self):
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# Check if the complete title has been shown
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if self._ticker_offset + self._max_title_length > len(self._current_item['title']):
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# Do not immediately show next item after scroll
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self._post_delay -= 1
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if self._post_delay == 0:
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self._current_item['new'] = False
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# Mark the previous item as 'old'
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self._next_item()
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else:
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# Increase scroll position
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self._ticker_offset += self.SCROLL_SPEED
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def ticker_update(self, _):
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self._check_for_refresh()
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# If no items were retrieved, return an empty string
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if not self._current_item:
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return " "*self._max_title_length
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# Prepare a substring of the item title
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response = self._current_item['title'][self._ticker_offset:self._ticker_offset+self._max_title_length]
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# Add spaces if too short
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response = response.ljust(self._max_title_length)
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# Do not immediately scroll
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if self._pre_delay > 0:
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# Change state during pre_delay for new items
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if self._current_item['new']:
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self._state = ['warning']
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self._pre_delay -= 1
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return response
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self._state = []
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self._check_scroll_done()
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return response
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def update(self, widgets):
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pass
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def state(self, _):
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return self._state
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# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
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