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Archive for the ‘Google Summer of Code’ Category

KDE Applications 4.11 released

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Today,  KDE Applications 4.11 has been released. Besides all the new features added, it’s nice to see that one of theses features are KMail supporting themes and that now we have a new theme editor for email headers.

You can see my full report of the Google Summer of Code project in which I worked in the past. In this post I talked about all this stuff.

You can get these themes from KMail -> View – > Headers -> Download New Themes.  And you can create your own ones using the KMail Header Theme Editor and upload them to KDE-Look.

At the moment, there are a couple of email header themes that look beautiful (Kudos to the authors):

KMail header theme

KMail header theme

Thanks to all the KDE Community for the new release, the new features added in applications, workspaces and the platform.

Written by Ronny Yabar

August 14, 2013 at 6:30 pm

First steps with Grantlee and KDE PIM GSoC

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Well, coding officially starts on May 24, now is time supposed to read documentation, know your mentor(s) and discuss the project ideas, needs, requirements, difficulties, etc. but as many other GSoCers I couldn’t resist to code something.

My goal for the last week was to write a very simple Qt application showing the power of Grantlee. The idea was to simulate that I am reading a message in Kmail and I want to change the theme again and again.

You can take a look at the code in the soc-pim branch or:

svn co svn://

Of course, you need to install Grantlee, before compiling the example:

git clone git://
cd grantlee
git checkout -b 0.1 origin/0.1
mkdir build && cd build
cmake ..
make && make install

Here some Kmail themes. I’m not an artist, so don’t expect too much, but I know some CSS and started creating the themes just for the example.

KDE theme for Kmail

KDE theme for Kmail

openSUSE theme for Kmail

openSUSE theme for Kmail

Nokia theme for Kmail

Nokia theme for Kmail

Konsole theme for Kmail

Konsole theme for Kmail

Don’t worry. Surely in the future there will be themes for everyone.

BTW, before continue, what is Grantlee?.
I talked about it in my GSoC proposal and Stephen has written a lot in his blog, but in case you haven’t read, here we go:

Grantlee is a Qt string template engine based on the Django template system. Django is a powerful Python framework that makes it easier to create web apps.

In general, what Grantlee does is that it allows an application separate logic from presentation. There are many benefits of doing this: Flexibility, clean code style (readability), consistency and beauty.

Developers concentrate on the technical aspects of the application (logic, performance,…) and artists work on the templates (HTML, CSS) and they both don’t need to touch each other’s code.

This separation allows the application to be built and tested independent of the visual presentation.

So, What would be the role of Grantlee in KDEPIM?

Let us see what is the job for the moment.
The MessageViewer is the library responsible for the header styling in some KDE PIM applications. If you browse the headerStyle class code, will see that there is HTML stuff everywhere. That makes hard, for both developer and artist, to change the way information is displayed.

That problem should be solved by integrating Grantlee with the MessageViewer and my task for now is to extract the presentation stuff, set up the Grantlee code and load the templates.

Of course the job is not only to load templates, I have in my mind all what can we achieve with this integration and believe me there is a lot to do. Grantlee has many cool features for theming, the API documentation is good and I will continue studying the capabilities during this community bounding period.

Well, it is very difficult to blog about all the Grantlee features in a post, but in case you are interested, you can have a quick overview of it here:

Grantlee for application developers.
Grantlee for theme artists.

Of course, I will be posting my grantlee adventures with KDEPIM week by week.

For example, this week I found a useful feature:
The ‘safe filter’. Imagine a mail message come with HTML content or special characters. We should render that message correctly in the template otherwise the content will look horrible.

The safe filter autoescapes a variable in case it has already been escaped. Just do:

{{ message|safe }}

That means, if a message comes with "Kmail & CO" ,that content will be rendered :

“Kmail & Co”

Filters affect the way variables are shown in a template. Grantlee comes with some default filters similar to Django like:

{{ variable|upper }} or {{ variable|cut:”something ” }} to cut a string from the variable. There are more filters and you can also create your own ones.

For the developer side, the fun thing is that you don’t need to rebuild your application if there is a change in the template.

For artists, the template syntax is really clear, very human readable.

I already started hacking a little on the headerStyle, but still I have nothing concrete so far to show you in a real world application. This is just the beginning. Althought, the MessageViewer code is huge, Thomas has given me good entry points to understand how it works.

The end result will be a MessageViewer without any presentation code and connected to a theme location.

The current default header styles are these:
Brief, Plain, Fancy, Enterprise and Mobile.

Please, if you are a KDE PIM user and want a change or feature on those styles, just tell me what to take into consideration before creating them. One feature we will provide is a user option to decide which header fields are displayed.

The second part of the GSoC project consists of GHNS integration in PIM applications that will use Grantlee, that way users can create and share their art-work. In the next weeks, we will be defining a standard package structure for those themes.

I consider theming an important part of the PIM module. On one side, users usually like to have their collection of beautiful themes, and on the other hand, it is also important for companies or educational institutions to show/export/print their identity (colors, logos, slogans).

In general, I’m happy understanding better and better how the project has to be carried on and my continuous Qt/KDE learning. If you have some feedback to provide, it will be well received.

I find the KDE community very friendly, that makes development, communication and the GSoC experience more enjoyable.

Hopefully, my mentors have passed the first week evaluation. I am really glad they are doing a great job and I am willing to help them with everything I can during the project.

Just kidding, they completely rock, their support and answers have helped me lot.

News about this integration coming soon.

Written by Ronny Yabar

May 8, 2010 at 3:47 am

Hello Planet and Welcome KDE Google Summer of Code

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Hello KDE Community.

My name is Ronny and I am from Peru (South America). I am a KDE user for about 3 years and now is time to develop for KDE.

My KDE life started some months ago and I already started doing some small contributions like Promo work here and developing a game in Playground called KPeg.

But, the happiness I feel right now is beyond words, because this year I was accepted for the Google Summer of Code Program to work on the Open Source Project I love: KDE.

A big thanks to the KDE community and specially to two KDE developers who will be my mentors: Thomas McGuire (Kmail) and Stephen Kelly (Akonadi, Kjots, Grantlee author). Guys, thanks for answering my questions and all your support during all the GSoC process.

I am going to work with the KDE-PIM team on integrating the Grantlee library in KDE PIM applications to improve the theming support.

So, let us have fun with this GSoC project and make KDE rock even more.

Abstract of the Proposal.

I am also happy that another person from Peru was accepted to work on this KDE/GSoC: Percy Triveño who will work with the KDE-EDU team on integrating KmPlot into KAlgebra.

Happy KDE SoC to everyone.

Written by Ronny Yabar

April 28, 2010 at 1:14 am

KDE 4.2 “The answer”

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kde 4First of all: I always prefer and love KDE for his elegance, customization, easy-usage, great applications and now because is really  interesting for programming. I use KDE in my everyday work: Konqueror (now Dolphin), konsole, k3b, Amarok, kate, Konversation, Kopete and other ones.

When KDE 4.0 was published many people criticize it very hard: A lot of bugs, different look and concept of desktop, different panels, new applications menu, widgets, etc, etc were some features that made most KDE users unhappy. However, KDE developers always said in the announcement page, blogs and mailing lists that KDE 4 is a work in progress and they will be working, coding hard to release new versions of KDE (4.1, 4.2… ) with a lot of improvements.

KDE 4.1 was much better than KDE 4.0(many bugs killed and improvements,more stability, applications,speed), but KDE 4.2, in my opinion, is a version, that give us a stable desktop  with cool, interesting, features not only for users but also for developers. This KDE version was named: “The answer” because it minimize negative, destructive. comments and people who didn’t believe in the KDE community and team. I consider these people don’t know appreciate the innovation and great effort.

Congratulations to the all KDE Team for the hard-work they made. I am really impressed about how can you customize your desktop, add new features and the KDE 4 development way.

In this video you can see the KDE 4 presentation in Google Campus where Aaron Seigo a famous KDE hacker member of the core-team talk about the KDE 4 technology and how KDE innovation can make current desktops obsolete.

Nepomuk, Decibel, Plasma, Oxygen, Solid, Phonon, Akonadi are some parts of KDE 4 that introduce new behaviours and will make a big change in KDE. I am particularly interested in Plasma and Nepomuk for development and deciding in which project participate for this Google Summer of Code. But I need more reading and practicing about how these work. If you  make a Gsoc proposal without researching, reading, practicing and talking to mentors you probably will fail.  In this page, you can see the initial process to start your KDE 4 development environment.

In general KDE 4  has as main goals: Improve the desktop user experience, have better applications and development platform and make our desktop a central place to be more productive. That is my impression and for now on I will continue researching and folowing the KDE development process.

Written by Ronny Yabar

March 2, 2009 at 8:16 pm

Blogging once again

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Wow.  Almost 4 months since my last post, sometimes it’s too hard to update my blog. However, I continue exploring and learning new technologies about my passion: Open Source/Free Software.

Here are some things that happened in the last months:

I started learning Python and Django and I have to admit that since the first moment I tried them that I like it very much. On the other hand, I got tired about how slow rails is and the error messages whenever you upgrade some gems and plugins. Conclusion: I switched to Python-Django for web development. Now I am re-writing an application, written in Rails, with Django.

My boss acquired a dedicated server hosting to run a lot of web services for his company use and proposed me to manage it. Now I am maintaining the server and it was fun to learn SSH and Fedora commands (I use Debian). SSH takes part of my everyday freelance work.

Last week, I finished the development of an e-commerce site for an American company called Misti International Inc. I used the Magento e-commerce platform to develop it. Which at the beginning seems beautiful with a lot of cool features, but you need some patience to understand it deeply, because has a complex structure with too many folder and files and it is kind of difficult to customize it. But, I worked hard on this site and my client is really happy about it. I strongly recommend to learn PHP5 and take a look at the Zend Framework to learn more about the Magento code.

I installed KDE 4.2 in my Debian machine. (Here is a quick tutorial ). The only thing I want to say is: THANKS to all the KDE team for give us this great technology that is so well created and designed. But I will talk about KDE in other posts, because I am really interested in developing for KDE.

Google Summer of Code 2009 was announced and I am going to apply this year again.  I already got in contact with a mentor to work in his proposal and received good feedback about it.

Written by Ronny Yabar

February 28, 2009 at 10:32 pm

BarCamp Lima 2008

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Si señores, se viene el 1er BarCamp Lima este 8 de noviembre, el cual no me pienso perder por ninún motivo. Ya estoy haciendo mis maletas. Así que me voy al barcamp a encontrarme con toda esa gente geek. Creo que estoy en racha de viajes, proyectos, me encanta esta vida. Será Dios?. No creo.

Un BarCamp es una reunión abierta, libre y flexible, que tiene como finalidad compartir conocimiento e intercambiar experiencias, y sobre todo buscar la participación de todos los asistentes a fin de interactuar en una verdadera comunidad. En un Barcamp todos participan, todos pueden dar una charla sobre su tema de preferencia. En un barcamp normalmente se habla sobre tecnología, internet. Más info en la Wikipedia.

En el caso del barcamp Lima se tocarán temas como web 2.0, negocios en internet, Open Source. Contará con la presencia de bloggers, desarrolladores, diseñadores, hackers, geeks, fans de Linux y del software libre.

Por mi parte, voy a dar con una charla sobre mi participación en el Google Summer of Code 2008 – Gran oportunidad para comprometerse realmente con el Open Source (Mentores y estudiantes).  Voy a colaborar llevando a una de mis mejores amigas: mi cámara, ah y pizarra y plumones. Y por supuesto que pienso compartir mis pequeñas experiencias, anécdotas  en proyectos web, uso de Linux y también seguramente aprenderé bastante de los demás. Eso es lo bueno de este tipo de charlas: El feedback.

Pueden ver el sitio oficial del evento y la wiki. Entre los auspiciadores, está HP del Perú, que brindará el local con capacidad para 70 personas, así que hay que ir temprano muchachos. Por lo que tengo entendido las inscripciones ya están cerradas.

Felicito a los organizadores, 2 grandes comunidades nacionales la Asociación Nacional De Webmasters Del Perú y el el PLUG por su dedicación, esfuerzo y organizar un evento así en tiempo récord.

Así que nos vemos en el BarCamp Lima y a disfrutar del evento.

Written by Ronny Yabar

November 2, 2008 at 1:34 am

What I learned from GSoC?

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Google Summer of Code was a wonderful experience for me, I’ll never forget it. I finished my project and that makes me feel great. Getting opinions and feedback from the Open Source community was really special. In general, this is what I learned:


Improved my communication skills: Doing a project that involves other people means that you have to be clear in your words, be brief but efficient, and most important, make people understand what you are trying to say.


I wrote a lot in English. (My project, IRC meetings, asking in the list, answering questions, etc). Although, English is not my first language I enjoyed having to be clear with my mentor, the OSVDB (Open Sourced Vulnerability Database) developers and the Google group of summer of coders.


Ruby and Ruby on Rails: This Ruby user’s guide helped me a lot. I haven’t finished it, but I learned a lot about this great language (regular expressions, strings, arrays, iterators, control structures, OOP, classes, methods). And I also do a lot of programing with the ruby on rails framework. I learned how to manage and modified some plugins.

Actually, working with views is not my favorite part of a project. However, CSS work at the end of the project was really fun. What CSS makes is impressive.

Solr: I never ever have worked with a search server. Solr is just amazing – Fulltext search capabilities. I learned how to integrate Solr and the act_as_solr plugin to my Rails application.

Subversion: I learned how to work with this collaboration tool which I consider makes you more productive. However, I had to deal with so many error messages. I need to learn more commands apart from the common ones.

Vulnerability and Patch concepts.

I believe that being an expert in these fields takes his time. I never did a security system and didn’t work with a security team before. But I learned key concepts related to patches and vulnerabilities that helped me a lot to write the code. For example:

  • Vulns classification: Location, Attack Type , Impact, Solution, Exploits.
  • Vulns technical description and how to test a vulnerability.
  • Patch severity: Critical, Severe,important, Minor, Pointless.
  • Security Products: Nikto, Snort and Nessus.
  • What CVE means.
  • How to associate a vuln-patch with a Vendor/Product/Version.

Many lessons learned in these months let me think what I did wrong and what I did well. I feel that  I’m not always as productive as I might like to, my effort changes with the tasks I’m doing.

Once I read some Linus interview in which he said that if you are completely present in a situation and totally focused on something then that something *becomes* interesting, whatever it may be.

So, I think that making your job interesting and fun and get really focused on the problem are the keys to your project success.

Thanks for your visit to the blog. You can follow me on Twitter:

¡Happy Hacking!

Written by Ronny Yabar

October 30, 2008 at 4:51 pm