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    • Favorite 2 January 2021
      bobjonkman favorited something by stigatle: Out enjoying a nice day with Marlyn and our kids. Love being outdoors:)
    • Favorite 26 December 2020
      bobjonkman favorited something by stigatle: Wish you all a great Christmas!
    • bobjonkman repeated a notice by steve 26 December 2020
      RT @steve Uncertainty Principle Podcast Episode 1: Isaac Newtons Pajamas Lots of people in history were born on this day. This reading of an article in the Washington Post remembers one of them, Isaac Newton, and his pandemic year.
    • Favorite 26 December 2020
      bobjonkman favorited something by steve: Uncertainty Principle Podcast Episode 1: Isaac Newtons Pajamas Lots of people in history were born on this day. This reading of an article in the Washington Post remembers one of them, Isaac Newton, and his pandemic year.
    • bobjonkman repeated a notice by rozzin 26 December 2020
      RT @rozzin Happy !gravmass, everyone!
    • Favorite 26 December 2020
      bobjonkman favorited something by rozzin: Happy !gravmass, everyone!
    • Favorite 24 December 2020
      bobjonkman favorited something by blacksam: Nothing puts me in the Christmas spirit like watching Ralphie slap the shit out of Scut Farkas. #chistmas
    • New note by bobjonkman 17 December 2020
      I was getting all enraged by Github removing from their site yet more software they don't agree with. It should be perfectly acceptable to have software that enhances privacy and gives users control over what's on their computers. If I want to use software that bans cookies, why should Github care? Cookie banners are perfectly […]
    • bobjonkman repeated a notice by geniusmusing 17 December 2020
      RT @geniusmusing No cookie for you The GitHub Blog >Good news: we removed all cookie banners from GitHub! 🎉 > >No one likes cookie banners. But cookie banners are everywhere. So how did we pull this off? > >Well, EU law requires you to use cookie banners if your website contains cookies that are […]
    • New note by bobjonkman 6 December 2020
      That article (from 2018!) is just like reading a dystopian #SciFi novel, all newspeak and doublethink: "The chip also supports the Android Strongbox Keymaster module, including Trusted User Presence and Protected Confirmation"

OpenDataDay Hackathon at Kwartzlab

Posted by Bob Jonkman on 27th February 2013

Open Data Waterloo Region


On International OpenDataDay four teams of hackers from OpenDataWR gathered at Kwartzlab to work on Food Premise Inspection Data, modelling new transit routes and route changes with GTFS data, improving the server for the Catchr transit app, a proof-of-concept pushbutton app for Android, and creating a Get Map button for OpenStreetMap in the Thunderbird Lightning add-in.

Hackers at Kwartzlab OpenDataDay Hackathon at Kwartzlab. Clockwise: Koo (back to camera), Ralph, Michael, Mike, Brett, Jonathan. Missing: Darcy, William, Katherine, Bob.


William and I worked on the Get Map button. Although we had hoped to create some working code, we got only as far as making a mock-up of Lightning’s Edit Event screen:

Screenshot of Thunderbird Lightning Edit Event screen
Lightning “Edit Event” screen, showing the new “Get Map” button


The first hurdle we ran into is that Lightning source code is kept in a Mercurial repository. Although William was familiar with Perforce (another code revision system), I haven’t used Mercurial until now. And the repository contained all of Thunderbird, Firefox, SeaMonkey, and the Mozilla addins. We certainly didn’t want to clone the entire Mozilla code base! So William found the Lightning tarball, which I unpacked in a new folder. This let us poke around the source files to find where our new code should go.

Then we found that Lightning isn’t straight Javascript, it’s mostly XUL. XUL is close enough to XHTML, CSS and DTD files that we could figure out what needed to be done. But we had a limited amount of time, and I didn’t want to spend it waiting for source code to build. So I created a new profile in Thunderbird, installed a fresh copy of the Lightning add-in, and we hacked at the installed files directly. This gave us instant feedback on the changes we made, just by restarting Thunderbird and running Lightning. Some of the changes were in plain text files, but others needed to be made to files in JAR format. One of those was the localized language file. We weren’t sure which language file we were using, en-GB or en-US. Of course, we picked the wrong one to start with, and spend maybe two hours trying to debug a misleading error message about a missing entity definition while we were working on the wrong file.

But it all turned out OK in the end. Now we need to take the work we did on the installed files and replicate it on the source files from the Mercurial repository, properly build Lightning from source, and offer our changes to the Mozilla Calendar project. And, once we’ve got it working, we’ll make the changes available on this site too.

–Bob and William.

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Posted in code, FLOSS, Open Data, Software | Comments Off on OpenDataDay Hackathon at Kwartzlab

Calendaring Server Software

Posted by Bob Jonkman on 12th October 2012

I’m looking for a free/libre calendar server to run on a GNU/Linux server.

It needs to have CalDAV connectivity, so that I can use Evolution, Sunbird or Thunderbird/Lightning as my only client. Ideally, it will also have a Web interface for both administration and calendar viewing, exports to iCal (.ics) files, supports iMIP, and offers Atom/RSS feeds of calendar items.

Here’s what I’ve found so far. If you know of others, please leave a comment.

There’s also a list at CalConnect’s CalDAV Servers

Name WebUI Export iCal (.ics) CalDAV
Admin View Edit iCal (.ics) iMip Atom/RSS
phpGroupWare       No     No
Chandler Project              
Zimbra Yes, but.. Yes Yes Yes   No Outlook only
EGroupware Community Version              
WebCalendar             No
Darwin Calendar Server              
Tryton Calendar              
ownCloud Yes Yes, but not Public, Read-only Yes No No No Yes
Citadel ? ? ? ? ? ? ?
Baikal ? ? ? ? ? ? ?
Horde ? Yes Yes Yes ? Maybe Yes

WordPress Plugins

The other calendars I’ve been trying are WordPress plugins. There is much promise in their description blurbs, but so far I’ve rejected most:

Name Export iCal (.ics) CalDAV Notes
iCal (.ics) iMip Atom/RSS
Calendar JCM         Rejected: no longer supported
Event Calendar / Scheduler         Rejected: missing .php modules when running
The Events Calendar         Rejected
WP Events Calendar Yes, with iCal for Events Calendar plugin   No No Works
My Calendar Only lists current month   Partial  
CalPress Pro ? ? ? ? This is a commercial plugin;
All-in-One Event Calendar by Timely By tweaking the “Add to Google” URL ? ? WebCal Possible privacy concern
  • 11 January 2011
    Originally posted
  • 26 March 2011
    Added Linuxaria’s suggestions
  • 16 April 2011
    Added WordPress plugin info; added CalDAV column; filled in some attributes
  • 11 October 2012
    Updated feature list for Zimbra
    I’ll be writing a review of Zimbra Open Source Edition soon, detailing some of my experiences (eg. requires Flash for the administrative Web interface)
  • 12 October 2012: Put WordPress calendars in table format, added My Calendar
  • 5 November 2012: Added Dosch’s suggestions
  • 16 November 2012: @Encyclomundist dents about
  • 26 September 2013: I’ve started to use ownCloud 5.0 as a calendar repository accessed with Lightning using WebCal. ownCloud doesn’t publish an iCal feed or have a public read-only view, but since it’s Free Software constantly under improvement I’ll stick with it for a while.
  • 9 November 2013: I think @postblue turned me on to Baikal: Using #Baikal to sync tasks, contacts and calendars
  • 9 November 2013: I’m now using Timely All-In-One on some blogs, will be upgrading others. It’s not the perfect iCal plugin, but the best one yet.
  • 9 November 2013: @McScx and @lxw37 both introduce me to Horde.
  • 13 August 2015: Just discovered Blaise Alleyne’s post on Degooglifying (Part IV): Calendar. This is pretty much the same solution I’ve settled on; ownCloud + Thunderbird and Lightning. I’m not quite as advanced as Blaise on the mobile front, though.

This is a “living” post, so it will float back to the top of the blog as I update it.


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Posted in Calendars and Schedules | 11 Comments »

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