Add a feeds plugin, using all images sorted by date.

docs/plugins.rst

@@ -108,3 +108,8 @@ Watermark plugin
 ===================
 
 .. automodule:: sigal.plugins.watermark
+
+Feeds plugin
+============
+
+.. automodule:: sigal.plugins.feeds

sigal/plugins/feeds.py

@@ -0,0 +1,80 @@
+# -*- coding: utf-8 -*-
+
+"""Plugin which add RSS/ATOM feeds.
+
+This plugin requires feedgenerator_. It uses all the images of the gallery,
+sorted by date, to show the most recent ones.
+
+.. _feedgenerator: https://pypi.python.org/pypi/feedgenerator
+
+Settings:
+
+- ``rss_feed`` and ``atom_feed``, see below.
+
+Example::
+
+    rss_feed = {'feed_url': 'http://example.org/feed.rss', 'nb_items': 10}
+    atom_feed = {'feed_url': 'http://example.org/feed.atom', 'nb_items': 10}
+
+"""
+
+import codecs
+import logging
+import os
+
+from datetime import datetime
+from feedgenerator import Atom1Feed, Rss201rev2Feed
+from jinja2 import Markup
+from sigal import signals
+
+logger = logging.getLogger(__name__)
+
+
+def generate_feeds(gallery):
+    # Get all images and sort by date
+    images = [img for album in gallery.albums.values()
+              for img in album.images if img.date is not None]
+    images.sort(key=lambda im: im.date, reverse=True)
+
+    settings = gallery.settings
+    if settings.get('rss_feed'):
+        generate_feed(gallery, images, feed_type='rss', **settings['rss_feed'])
+    if settings.get('atom_feed'):
+        generate_feed(gallery, images, feed_type='atom',
+                      **settings['atom_feed'])
+
+
+def generate_feed(gallery, images, feed_type=None, feed_url='', nb_items=0):
+    root_album = gallery.albums['.']
+    cls = Rss201rev2Feed if feed_type == 'rss' else Atom1Feed
+    feed = cls(
+        title=Markup(root_album.title),
+        link='/',
+        feed_url=feed_url,
+        description=Markup(root_album.description).striptags()
+    )
+
+    nb_images = len(images)
+    nb_items = min(nb_items, nb_images) if nb_items > 0 else nb_images
+
+    for item in images[:nb_items]:
+        feed.add_item(
+            title=Markup(item.title or item.url),
+            link='%s/#%s' % (item.path, item.url),
+            # unique_id='tag:%s,%s:%s' % (urlparse(link).netloc,
+            #                             item.date.date(),
+            #                             urlparse(link).path.lstrip('/')),
+            description='<img src="%s/%s" />' % (item.path, item.thumbnail),
+            # categories=item.tags if hasattr(item, 'tags') else None,
+            author_name=getattr(item, 'author', ''),
+            pubdate=item.date or datetime.now(),
+        )
+
+    output_file = os.path.join(root_album.dst_path, feed_url.split('/')[-1])
+    logger.info('Generate %s feeds: %s', feed_type.upper(), output_file)
+    with codecs.open(output_file, 'w', 'utf-8') as f:
+        feed.write(f, 'utf-8')
+
+
+def register(settings):
+    signals.gallery_build.connect(generate_feeds)

tests/sample/sigal.conf.py

@@ -9,7 +9,8 @@ keep_orig = True
 links = [('Example link', 'http://example.org'),
          ('Another link', 'http://example.org')]
 
-plugins = ['sigal.plugins.adjust', 'sigal.plugins.copyright', 'sigal.plugins.watermark']
+plugins = ['sigal.plugins.adjust', 'sigal.plugins.copyright',
+           'sigal.plugins.watermark', 'sigal.plugins.feeds', ]
 copyright = u"© An example copyright message"
 adjust_options = {'color': 0.0, 'brightness': 1.0,
                   'contrast': 1.0, 'sharpness': 0.0}
@@ -20,6 +21,9 @@ watermark_opacity = 0.3
 theme = 'colorbox'
 thumb_size = (200, 150)
 
+rss_feed = {'feed_url': 'http://example.org/feed.rss', 'nb_items': 10}
+atom_feed = {'feed_url': 'http://example.org/feed.atom', 'nb_items': 10}
+
 # theme = 'galleria'
 # thumb_size = (280, 210)
 # show_map = True