Inkycal/inkycal/modules/inkycal_feeds.py

#!python3

"""
Feeds module for InkyCal Project
Copyright by aceisace
"""
import re

from inkycal.modules.template import inkycal_module
from inkycal.custom import *

from random import shuffle

try:
    import feedparser
except ImportError:
    print('feedparser is not installed! Please install with:')
    print('pip3 install feedparser')

filename = os.path.basename(__file__).split('.py')[0]
logger = logging.getLogger(filename)


class Feeds(inkycal_module):
    """RSS class
    parses rss/atom feeds from given urls
    """

    name = "RSS / Atom - Display feeds from given RSS/ATOM feeds"

    requires = {
        "feed_urls": {
            "label": "Please enter ATOM or RSS feed URL/s, separated by a comma",
        },

    }

    optional = {

        "shuffle_feeds": {
            "label": "Should the parsed RSS feeds be shuffled? (default=True)",
            "options": [True, False],
            "default": True
        },

    }

    def __init__(self, config):
        """Initialize inkycal_feeds module"""

        super().__init__(config)

        config = config['config']

        # Check if all required parameters are present
        for param in self.requires:
            if not param in config:
                raise Exception(f'config is missing {param}')

        # required parameters
        if config["feed_urls"] and isinstance(config['feed_urls'], str):
            self.feed_urls = config["feed_urls"].split(",")
        else:
            self.feed_urls = config["feed_urls"]

        # optional parameters
        self.shuffle_feeds = config["shuffle_feeds"]

        # give an OK message
        print(f'{filename} loaded')

    def _validate(self):
        """Validate module-specific parameters"""

        if not isinstance(self.shuffle_feeds, bool):
            print('shuffle_feeds has to be a boolean: True/False')

    def generate_image(self):
        """Generate image for this module"""

        # Define new image size with respect to padding
        im_width = int(self.width - (2 * self.padding_left))
        im_height = int(self.height - (2 * self.padding_top))
        im_size = im_width, im_height
        logger.info(f'Image size: {im_size}')

        # Create an image for black pixels and one for coloured pixels
        im_black = Image.new('RGB', size=im_size, color='white')
        im_colour = Image.new('RGB', size=im_size, color='white')

        # Check if internet is available
        if internet_available() == True:
            logger.info('Connection test passed')
        else:
            raise Exception('Network could not be reached :/')

        # Set some parameters for formatting feeds
        line_spacing = 1
        line_height = self.font.getsize('hg')[1] + line_spacing
        line_width = im_width
        max_lines = (im_height // (self.font.getsize('hg')[1] + line_spacing))

        # Calculate padding from top so the lines look centralised
        spacing_top = int(im_height % line_height / 2)

        # Calculate line_positions
        line_positions = [
            (0, spacing_top + _ * line_height) for _ in range(max_lines)]

        # Create list containing all feeds from all urls
        parsed_feeds = []
        for feeds in self.feed_urls:
            text = feedparser.parse(feeds)
            for posts in text.entries:
                summary = posts.summary
                parsed_feeds.append(
                    f"•{posts.title}: {re.sub('<[^<]+?>', '', posts.summary)}")

        self._parsed_feeds = parsed_feeds

        # Shuffle the list to prevent showing the same content
        if self.shuffle_feeds == True:
            shuffle(parsed_feeds)

        # Trim down the list to the max number of lines
        del parsed_feeds[max_lines:]

        # Wrap long text from feeds (line-breaking)
        flatten = lambda z: [x for y in z for x in y]
        filtered_feeds, counter = [], 0

        for posts in parsed_feeds:
            wrapped = text_wrap(posts, font=self.font, max_width=line_width)
            counter += len(wrapped)
            if counter < max_lines:
                filtered_feeds.append(wrapped)
        filtered_feeds = flatten(filtered_feeds)
        self._filtered_feeds = filtered_feeds

        logger.debug(f'filtered feeds -> {filtered_feeds}')

        # Check if feeds could be parsed and can be displayed
        if len(filtered_feeds) == 0 and len(parsed_feeds) > 0:
            print('Feeds could be parsed, but the text is too long to be displayed:/')
        elif len(filtered_feeds) == 0 and len(parsed_feeds) == 0:
            print('No feeds could be parsed :/')
        else:
            # Write feeds on image
            for _ in range(len(filtered_feeds)):
                write(im_black, line_positions[_], (line_width, line_height),
                      filtered_feeds[_], font=self.font, alignment='left')

        # return images
        return im_black, im_colour


if __name__ == '__main__':
    print(f'running {filename} in standalone/debug mode')