Blog - page 10

Recent Posts

Transparent loading of compressed Callgrind files in KCacheGrind (March 12, 2010)

Hey everyone!

I just committed an (imo) insanely useful feature for KCacheGrind: Transparent loading of compressed Callgrind files. Finally one does not have to keep those Callgrind files around uncompressed, hogging up lots of space. And what is even more important: It’s much easier to share these files now, as you can send or upload them as .gz or better yet .bz2 and open them directly. KDE architecture just rocks :) So in KDE 4.5 the best profiling visualizer just got better :D

In related news: I’m spending my time as intern at KDAB currently by creating an application to visualize Massif. If you are interested, check the sources out on gitorious:

It’s still pretty limited in what it offers, yet is probably already more useful than the plain ASCII graph that ms_print generates:

Visualization of a Massif output file

This is very WIP but the visuals are somewhat working now. I plan to make the whole graph react on user input, i.e. zoomable, click to show details about snapshots, show information about the heap items that make up the stacked part of the diagram, …

continue reading...

Kate/KDevelop HackSprint - Up To Day 4 (February 18, 2010)

Woha, quite a few days flew by without me blogging about anything. Thankfully the others started to write so I don’t have to repeat it all ;-) Instead I’ll concentrate on stuff I did or learned.

GHNS for Snippets

Well, first I think an excuse is in oder: There is a GHNS button for Kate Snippets in 4.4.0 but it’s broken, neither me nor Joseph had time to acutally use and fix it… But anyways, I fixed it now for 4.4.1. For 4.5 we’ll also have an Upload Dialog.

I also added both now to KDevelop, you can now upload and download snippets from it. I added a few dump examples but will probably improve it steadily.

Kate Performance

On Saturday and Sunday I started to profile Kate highlighting for a large MySQL dump and managed to greatly improve the speed. Actually the funny thing is that I could improve RegExp based highlighting (you still should try to prevent using it, it will always be slower than simple char/string based highlighting). And the knowledge for this optimization I had from my time as an active contributor for GeSHi. I feel like it was ages ago, he funny :)

continue reading...

Kate/KDevelop HackSprint Day 1 (February 14, 2010)

So, first day of the Kate/KDevelop hacksprint.

We just talked and hacked at the rented flat,got to know each other and had a fun time. Everybody made it more or less in time, even last minute attendee Adymo from Ukraine, nice! Hacking-wise the productivity wasn’t that high, esp. for me, but a few patches got committed here and there.

Right now I’m working on a little speedup for Kate, esp. for big MySQL files - lets see how it turns out. Cullmann showed me a few things I could do so maybe it works out, lets see.

Over the next week I plan to push in user configurable include paths for the PHP plugin and do some more Snippets & Scripting work in Kate, lets see how it turns out. I’ll go home now, kinda sucks that I don’t stay with the others here at the flat but have to take a 1h ride into the city… Berlin is definitely too big :D

continue reading...

FOSDEM 2010 - Day 1 (February 07, 2010)

Hey everyone!

Just a quick blurb about my first day at FOSDEM so far:

The City of Brussels

All I have to say about the things I saw this morning is simply: Wow. What a city. I really like it’s … /”style”/?! Magnificent old buildings, no dull corners, everything is a bit organic, grown together. I really like it. When I drove with the bus to the University today I really got thinking: What could Berlin have looked like if not these sons of b*****s messed up our history… Oh well - off to better thoughts…

The KDevelop talk by Aleix

Yeah, I think Aleix really nailed this one! Imo it was really well done and the audience also received it well. I really liked how he first talked about some parts that are so good in KDevelop (“we know everything” ;-)) and then - BOOM - he showed it off :) There were some interesting questions from the audience as well, probably most notably something along the lines of:

Eclipse has 300+ developers working on it - how do you manage to create something faster and better (for C++)

continue reading...

Snippets In KDevelop / Kate (February 03, 2010)

Hey all!

Just wanted to give you a little rundown on Snippets in Kate 4.4 (via the snippets_tng plugin) and KDevelop Beta 8 (soon to be released).

Note: The Kate plugin was written by Jowenn and introduced me to all these nice features. For KDevelop I wrote a somewhat simpler yet imo better implementation. We will try to get the best of both worlds into KDE 4.5. Stay tuned!

General Usage & Features

  • create a snippet repository (or download via GHNS [see below])
  • create snippets in that repository
  • insert snippets via the snippets view (i.e. double click), or (imo better/faster) insert them via code-completion (remember: CTRL + Space requests code completion at the current cursor position!).
  • snippet gets inserted (properly indented) and potential placeholders/variables get expanded. A variable is something like %{date} or ${email}. Also take a look at the API documentation.
  • variables that get inserted via “${…}” will be “selectable”, meaning you can jump from one var to the other by hitting TAB / Shift TAB
  • the %{...} vars will only get expanded and inserted, without getting selectable.
  • multiple occurrences of the same variable will be updated once one of them gets edited, something that is called “mirroring” in other editors.
  • once one edits ESC the cursor is placed at the end of the snippet or to the first occurrence of ${cursor} or %{cursor} and the user types something, the snippet-handler quits and you are left with your normal editor until you insert the next snippet
  • nested snippets (i.e. insert snippet than insert another one) should “just work”.

continue reading...

FOSDEM, 4.4 release party in Berlin, ... (January 28, 2010)

Hey everyone, just a quick blurp:


Yeah, I’ll go to FOSDEM! Will be my first time, I’m really looking forward to it. Esp. considering that it marks the end of my current semester. My current plan for the following days is:

  • visit relatives & friends
  • go to FOSDEM
  • get an immense overload of hacking at the Kate/KDevelop sprint
  • start working as an intern at KDAB

Looks like the future will be much fun :)

But back to FOSDEM: If you have any questions about Kate/KDevelop/PHP, visit me at the KDE booth. I’ll also attend Aleix’s talk about KDevelop for sure.

4.4 release party in Berlin

So well, Nighrose poked me on IRC and I added a short note about a small get-together on the 13th in Berlin. I’m reluctant to call it release party since it’ll be at the rented flat for the Kate/KDevelop sprint attendees, hence only a limited number of people can attend. But esp. other KDE/Qt/KDAB hackers in Berlin & vicinity are welcome. If you want to come by, take a look at the wiki notes about the “party” and contact me by mail.

continue reading...

Kate polishing (January 21, 2010)

Phew, I just finished some last-minute backports to the KDE 4.3.5 branch. Lets hope the bug fixes I and pletourn did are as good as they look. Expect a much more stable Kate for 4.3.5 & 4.4! We managed to fix two bugs which are potentially the cause for dozens of bug reports, all seemingly random. Lets see whether our fixes hold up to our hopes!

Other than that: You should look forward to Kate scripting (with JavaScript) in 4.4. It’s dead simple but actually useful. In the utils.js file we ship with Kate there are now the following tools (all operate on the selection or - if none exists - on the whole document):

  • sort - simple sorting
  • natsort - natural sorting
  • uniq - filter duplicates
  • trim - remove leading & trailing whitespace
  • ltrim - remove leading whitespace
  • rtrim - remove trailing whitespace

Do you have more ideas for such simple helper functions?

continue reading...

progress in PHP support for KDevelop (January 20, 2010)

Hey everyone. Been some time since I last blogged… I want to take the chance to give you all a bit of overview over the last changes in the PHP plugin for KDevelop:

Performance Improvements

I spent quite some time profiling various aspects of the PHP plugin, be it parsing and DUChain building over to (just yesterday) code completion. I’m confident to say that I found (and removed) quite a few bottlenecks, making the plugin much more comfortable to use.

I’m really blown away time over time again by valgrind & KCachegrind… What would we do without these tools?


An (imo) very strong point for using KDevelop for PHP programming is it’s seamless support for documentation. Be it the “simple” inline documentation in the Declaration Tooltips or the extended integration of the remote docs. But these past days I improved our generator for the inline documentation of built-in PHP language constructs considerably:

  • add documentation for function/method parameters
  • add @since where appropriate
  • fix some missing declarations or bugs, esp. some that where part of SPL

continue reading...

PHP & PHP-Docs now in extragear/sdk/kdevelop-plugins (January 08, 2010)

Hey everyone! The PHP & PHP-Docs plugins for KDevelop now moved to Extragear! The new locations are:


Or the anonsvn equivalent:


Happy coding!

continue reading...

Spotlight: linux-minidisc (January 01, 2010)

Hi there!

Today I want to abuse the fact, that my blog is aggregated on some planets, to bring a project of a friend of mine into the spotlight:

The Linux-Minidisc project

It’s a project to bring Read/Write access on mini discs to Linux. It consists of a CLI and a Qt Gui. All code is licensed under the GPL and can be accessed via Git.

To get a nice introduction about the project, read this excerpt from a recent Linux Journal edition:

The project itself has a wiki under the following address:

As every other FOSS project, Adrian and his fellow developers need more man power. Especially someone who can spruce up the Qt GUI is needed. Help them!

continue reading...