# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1342476215 -7200
# Node ID eee0ea142168d3f341afae6481529f268f8604e3
# Parent  685687ea5d71cb4b845727d77cca8e9cbf906121
Added a macro based on FeedReader to obtain and present shared updates.

diff -r 685687ea5d71 -r eee0ea142168 macros/SharedContent.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/macros/SharedContent.py	Tue Jul 17 00:03:35 2012 +0200
@@ -0,0 +1,141 @@
+# -*- coding: iso-8859-1 -*-
+"""
+    MoinMoin - SharedContent macro, based on the FeedReader macro
+
+    @copyright: 2008, 2012 by Paul Boddie <paul@boddie.org.uk>
+    @license: GNU GPL (v2 or later), see COPYING.txt for details.
+"""
+
+from MoinMoin.Page import Page
+import urllib
+import xml.dom.pulldom
+
+Dependencies = ["time"]
+
+MAX_ENTRIES = 5
+ATOM_NS = "http://www.w3.org/2005/Atom"
+
+def text(element):
+    nodes = []
+    for node in element.childNodes:
+        if node.nodeType == node.TEXT_NODE:
+            nodes.append(node.nodeValue)
+    return "".join(nodes)
+
+def linktext(element, feed_type):
+    if feed_type == "rss":
+        return text(element)
+    else:
+        return element.getAttribute("href")
+
+def execute(macro, args):
+    request = macro.request
+    fmt = macro.formatter
+
+    max_entries = MAX_ENTRIES
+    args = args.split(",")
+    if args:
+        try:
+            feed_url = args[0]
+            max_entries = int(args[1])
+        except IndexError:
+            pass
+
+    # Obtain the feed.
+
+    feed = urllib.urlopen(feed_url)
+
+    try:
+        # Parse each node from the feed.
+
+        title = link = None
+        channel_title = channel_link = None
+
+        output = []
+        append = output.append
+        append(fmt.bullet_list(on=1))
+
+        feed_type = None
+        in_item = False
+        nentries = 0
+
+        events = xml.dom.pulldom.parse(feed)
+
+        for event, value in events:
+
+            if event == xml.dom.pulldom.START_ELEMENT:
+                tagname = value.localName
+
+                # Detect the feed type and items.
+
+                if tagname == "feed" and value.namespaceURI == ATOM_NS:
+                    feed_type = "atom"
+
+                elif tagname == "rss":
+                    feed_type = "rss"
+
+                # Detect items.
+
+                elif feed_type == "rss" and tagname == "item" or \
+                    feed_type == "atom" and tagname == "entry":
+
+                    in_item = True
+
+                elif tagname == "title":
+                    events.expandNode(value)
+                    if in_item:
+                        title = value
+                    else:
+                        channel_title = value
+
+                elif tagname == "link":
+                    events.expandNode(value)
+                    if in_item:
+                        link = value
+                    else:
+                        channel_link = value
+
+            elif event == xml.dom.pulldom.END_ELEMENT:
+                tagname = value.localName
+
+                if feed_type == "rss" and tagname == "item" or \
+                    feed_type == "atom" and tagname == "entry":
+
+                    in_item = False
+
+                    # Emit title and link information for items.
+
+                    if title and link and nentries < max_entries:
+                        link_text = linktext(link, feed_type)
+
+                        append(fmt.listitem(on=1))
+                        append(fmt.url(on=1, href=link_text))
+                        append(fmt.icon('www'))
+                        append(fmt.text(" " + text(title)))
+                        append(fmt.url(on=0))
+                        append(fmt.listitem(on=0))
+
+                    title = link = None
+                    nentries += 1
+
+        append(fmt.bullet_list(on=0))
+
+        if channel_title and channel_link:
+            channel_link_text = linktext(channel_link, feed_type)
+
+            append(fmt.paragraph(on=1))
+            append(fmt.url(on=1, href=channel_link_text))
+            append(fmt.text(text(channel_title)))
+            append(fmt.url(on=0))
+            append(fmt.text(" "))
+            append(fmt.url(on=1, href=feed_url))
+            append(fmt.icon('rss'))
+            append(fmt.url(on=0))
+            append(fmt.paragraph(on=0))
+
+    finally:
+        feed.close()
+
+    return ''.join(output)
+
+# vim: tabstop=4 expandtab shiftwidth=4