Context

I have just switched to KDE after using Gnome during many years, and I am quietly getting used to it.

But recently I had to merge 2 PDF files, so I searched for a good solution for KDE. There are many command-line tools to do this on Linux, but the few graphical interfaces are very ugly.

So I thought it would be great to integrate a merge/split PDF function directly in Dolphin, the KDE file manager. In dolphin when you right-click on a file, a menu pops up with a sub-menu “Actions”, where you can add your features. I will now explain how I did this.

Prerequisites

• You need to be running a recent version of KDE (using Dolphin as your file manager). I have the version 4.3.5.
• To manipulate your PDF files, you need a command-line tool, I chose pdftk. You can install the package pdftk on kubuntu, for example by typing in a terminal:

  sudo apt-get install pdftk

Create scripts to merge/split PDF files automatically

I created two scripts: one to merge PDF files, and the other one to split them. I put both files in the directory /opt/pdf-service:

• /opt/pdf-service/pdf-service-merge.sh (download):

  #!/bin/bash
  # Run a command to merge PDF files
  # Used to add a context menu in Dolphin for PDF files
  
  pdftk "$@" cat output "${1%.pdf}_merged.pdf"

• /opt/pdf-service/pdf-service-split.sh (download):

  #!/bin/bash
  # Run a command to split PDF files
  # Used to add a context menu in Dolphin for PDF files
  
  for file in "$@"
  do
     out_dir="${file%.pdf}_pages"
     mkdir -p "$out_dir"
     pdftk "$file" burst output "$out_dir/page_%04d.pdf"
  done

Here are the steps you need to follow to get these files properly on your computer:

• Create the /opt/pdf-service directory: type in a terminal:

  sudo mkdir /opt/pdf-service

• Download the two files in the directory: type in a terminal:

  cd /opt/pdf-service && sudo wget http://www.viesurip.fr/wp-content/uploads/2010/02/pdf-service-split.sh http://www.viesurip.fr/wp-content/uploads/2010/02/pdf-service-merge.sh

• Make the files executable: type in a terminal:

  sudo chmod a+x /opt/pdf-service/*.sh

Add the service to Dolphin

A service in Dolphin is declared using a simple .desktop file in the directory /usr/share/kde4/services/ServiceMenus/: Here is the file you should put as /usr/share/kde4/services/ServiceMenus/pdf-servicemenu.desktop (download):

[Desktop Entry]
Type=Service
ServiceTypes=KonqPopupMenu/Plugin
MimeType=application/pdf
Actions=split;merge;

[Desktop Action split]
Name=Split PDF pages
Name[fr]=Découper les pages du PDF
Icon=gnome-mime-application-pdf
Exec=/opt/pdf-service/pdf-service-split.sh %F

[Desktop Action merge]
Name=Merge PDF files
Name[fr]=Fusionner les PDFs
Icon=gnome-mime-application-pdf
Exec=/opt/pdf-service/pdf-service-merge.sh %F

To install this file, just type in a terminal:

cd /usr/share/kde4/services/ServiceMenus && sudo wget http://www.viesurip.fr/wp-content/uploads/2010/02/pdf-servicemenu.desktop

Conclusion

Now you just need to close all opened windows of Dolphin, launch it again, and you should see the menu entries in the Actions submenu when you right-click on a PDF file.

The entries are only available in English and French in my file, but you can easily add another language in the pdf-servicemenu.desktop file.

It would be great to have an user-friendly interface to install packages that add useful submenu entries like that! Some sorf of Dolphin extensions…

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I just finished my internship at Jolicloud as part of my studies in TELECOM Bretagne. It lasted almost one year.

Jolicloud is a new start-up created by Tariq Krim (who created Netvibes) that builds an operating system adapted to netbooks and focused on the web technologies and services.

I lived from the inside the launching of a start-up: idea, research, launching of a private alpha, founding, arrival of big competitors (like Google Chome OS), hiring, beta and release roadmap… We were three at the beginning: Tariq Krim, Romain Huet and me.

Regarding development, it is an interesting challenge: transform a Linux distribution into an ergonomic and beautiful operating system based on web technologies instead of the usual Linux technologies (HTML instead of GTK, Javascript instead of C…).

We use Ruby On Rails and JQuery to develop the central web application that constitutes Jolicloud and python to make our web application communicate with the system.

First developments were focused on two things: modify Ubuntu to transform it into the Jolicloud OS, and create an applications directory like the one on the Apple iPhone, to install/remove/update applications in one click. This directory is based on APT, the technology used by Debian (and Ubuntu) to manage files on the system. And Prism has been fully integrated to put web applications (Google Docs, GMail, Facebook…) on the desktop.

The currently available version of Jolicloud is far from complete: it is just an idea of what we want to do. Developments go faster now and we have plenty of ideas I can’t talk about. Sadly I have to go back to school for my 3rd year at TELECOM Bretagne, but I hope I will still be able to participate in Jolicloud.

While Google Chrome OS will probably only allow to launch web applications, local applications can be used with Jolicloud. And Jolicloud wants to integrate all web services, not only Google ones… And Moblin isn’t really focused on the web. Personnally, I would like the Jolicloud concept on my notebook too, if the interface were adapted. So Jolicloud probably has a bright future… to be continued

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