From 3798c8f796809cef8718589b27adc01ba45f7097 Mon Sep 17 00:00:00 2001
From: Massimo Di Pierro <massimo.dipierro@gmail.com>
Date: Thu, 5 Apr 2012 18:03:55 -0500
Subject: [PATCH] generic.ics

---
 VERSION                                |  2 +-
 applications/welcome/views/generic.ics | 17 ++++++++++
 gluon/serializers.py                   | 47 +++++++++++++++++++-------
 3 files changed, 53 insertions(+), 13 deletions(-)
 create mode 100644 applications/welcome/views/generic.ics

diff --git a/VERSION b/VERSION
index d1518ec7..9c0abb0c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 1.99.7 (2012-04-05 16:57:05) dev
+Version 1.99.7 (2012-04-05 18:03:27) dev
diff --git a/applications/welcome/views/generic.ics b/applications/welcome/views/generic.ics
new file mode 100644
index 00000000..a812bfe2
--- /dev/null
+++ b/applications/welcome/views/generic.ics
@@ -0,0 +1,17 @@
+{{
+###
+# response._vars contains the dictionary returned by the controller action
+# Assuming something like:
+#
+# db.define_table('event',
+#                 Field('title'),
+#                 Field('start_datetime','datetime'),
+#                 Field('stop_datetime','datetime'))
+#   events = db(db.event).select()
+#
+# Aor this to work the action must return something like
+#
+#   dict(events=events, title='title',link=URL('action'),timeshift=0)
+#
+###
+from gluon.serializers import ics}}{{=XML(ics(**response._vars))}}
diff --git a/gluon/serializers.py b/gluon/serializers.py
index 197e43af..ee8501b4 100644
--- a/gluon/serializers.py
+++ b/gluon/serializers.py
@@ -64,24 +64,47 @@ def json(value,default=custom_json):
 def csv(value):
     return ''
 
+def ics(events, title=None, link=None, timeshift=0):
+    import datetime
+    title = title or '(unkown)'
+    if link and not callable(link):
+        link = lambda item: link +'/%s' % link['id']
+    s = 'BEGIN:VCALENDAR'
+    s += '\nVERSION:2.0'
+    s += '\nX-WR-CALNAME:%s' % title
+    s += '\nSUMMARY:%s' % title
+    s += '\nPRODID:Generated by web2py'
+    s += '\nCALSCALE:GREGORIAN'
+    s += '\nMETHOD:PUBLISH'
+    for item in events:
+        s += '\nBEGIN:VEVENT'
+        s += '\nUID:%s' % item['id']
+        if link:
+            s += '\nURL:%s' % link(item)
+        shift = datetime.timedelta(seconds=3600*timeshift)
+        start = item['start_datetime']+shift
+        stop = item['stop_datetime']+shift
+        s += '\nDTSTART:%s' % start.strftime('%Y%m%dT%H%M%S')
+        s += '\nDTEND:%s' % stop.strftime('%Y%m%dT%H%M%S')
+        s += '\nSUMMARY:%s' % item['title']
+        s += '\nEND:VEVENT'
+    s += '\nEND:VCALENDAR'
+    return s
 
 def rss(feed):
     if not 'entries' in feed and 'items' in feed:
         feed['entries'] = feed['items']
     now=datetime.datetime.now()
-    rss = rss2.RSS2(title = feed['title'],
-                    link = str(feed['link']),
-                    description = feed['description'],
+    rss = rss2.RSS2(title = feed.get('title','(notitle)'),
+                    link = feed.get('link',None),
+                    description = feed.get('description',''),
                     lastBuildDate = feed.get('created_on', now),
-                    items = [rss2.RSSItem(\
-                                        title=entry['title'],
-                                        link=str(entry['link']),
-                                        description=entry['description'],
-                                        pubDate=entry.get('created_on', now)
-                                        )\
-                                    for entry in feed['entries']
-                                    ]
-                    )
+                    items = [rss2.RSSItem(
+                title=entry.get('title','(notitle)'),
+                link=entry('link',None),
+                description=entry.get('description',''),
+                pubDate=entry.get('created_on', now)
+                ) for entry in feed.get('entries',[])])
     return rss2.dumps(rss)