Jannis Pohlmann

Jannis

I am an open source enthusiast, student and musician from Lübeck, Germany. In my free time I enjoy hacking on Xfce and Lunar Linux. I've been a member of both teams since about 2005. Besides developing software, I love to listen to and play music (Guitar, Bass and Drums) and hang out with friends.

Contact me via jannis@xfce.org. My public PGP key is 0x354AFBA6. You can download it from here.

My CV is also available for download.

Sunday, September 13 2009

Xfce 4.8 Release Cycle Information

At the end of August, we've entered the development phase for the Xfce 4.8 release cycle. Today, we're hitting dependency freeze and I think this is a good time to inform you about how the cycle will look like and what we're planning to achieve for 4.8.

The final 4.8 release is scheduled for April 12th, 2010, which is in about 8 months. We're trying to stick to a well-defined release policy for the first time. This includes frequent development releases of individual components and, most importantly, a time-based release cycle.

I'm confident that we can meet the schedule you can see below and would like to encourage everyone to participate in the development and continued improvement of Xfce 4.8, be it as a developer, a translator or a generally active member of the Xfce community.

Below you find detailed information about the 4.8 schedule, the release team, dependencies and planned features. This information is also available on the wiki.

Schedule

2009-08-16 - 2009-08-30: Planning phase
2009-08-31 - 2009-09-13: Extended planning phase
2009-09-13: Dependency freeze

2009-08-31 - 2010-01-31: Development phase
2010-02-01 - 2010-04-12: Release phase

2010-02-01: Xfce 4.8pre1 release / Feature freeze
2010-03-01: Xfce 4.8pre2 release / String freeze
2010-03-29: Xfce 4.8pre3 release / Code freeze

2010-04-12: Xfce 4.8 final release

Release Team

   Release Manager: Jannis Pohlmann
QA Official: Stephan Arts
Release Assistants: Jérôme Guelfucci
Ali Abdallah
Yves-Alexis Perez
Robby Workman
Vincent Tunru

You can read up on the roles of these people on this page if you feel like you need to contact one of them because there's something going wrong with the development or release process.

Dependencies

Xfce 4.8 will depend on the following libraries and applications:

  • cairo >= 1.0.0
  • dbus-1 >= 1.0.0
  • dbus-glib-1 >= 0.73
  • gdk-pixbuf-2.0 >= 2.14.0
  • gio-2.0 >= 2.18.0
  • glib-2.0 >= 2.18.0
  • gmodule-2.0 >= 2.18.0
  • gobject-2.0 >= 2.18.0
  • gthread-2.0 >= 2.18.0
  • gtk+-2.0 >= 2.14.0
  • libpng12 >= 1.2.0
  • libwnck-1.0 >= 2.22
  • x11 >= 1.1.0

The following dependencies are still left open:

  • garcon-1 (no release yet, but used in different places)
  • tumbler (no release yet, but used in different places)
  • sphinx (for documentation)

Planned Features

In the following, we give you an overview of the features we are planning to implement for 4.8. Please note that due to the voluntary nature of the Xfce development, none of features are guaranteed to make it into the final release. This feature list may also not be complete as we might be able to implement even more during the cycle. This list is meant to give you an insight in what we're up to and what you might be able to expect in 8 months.

You can find a (hopefully) always up to date list on the wiki page. Each of the pages linked there contains more detailed information about the features, their implementation status and sometimes also who has taken the responsibility to work on them.

We welcome people to help in achieving these goals. All of our repositories are now managed using git (on http://git.xfce.org/) so it's easy to clone them and contribute code to Xfce.

exo

  • Remove deprecated APIs and rename library to exo-1
  • Add GIO module for URI handling to support gtk_show_uri()

libxfce4ui

  • Port all Xfce core components to libxfce4ui instead of libxfcegui4
  • Object-oriented session client
  • GtkBuilder support for e.g. XfceTitledDialog

thunar

  • Finish the migration to GIO/GVfs. Among other features, this will give us network browsing (windows shares, SSH, FTP etc.).
  • Implement our own volume monitoring backend for GIO (based on HAL or DeviceKit-disks)
  • Update thunar-volman to work with this volume monitoring backend and port it to xfconf
  • Integration of remote locations in the side pane
  • Improve integration of tumbler for thumbnailing
  • Port all ThunarVFS thumbnailers to tumbler, write backwards-compatible tumbler plugin for thunar-thumbnailers
  • Use a single progress dialog, grouping all file operations
  • Extend the D-Bus interface so that e.g. xfdesktop can re-use the file properties dialog
  • Startup notification support in the custom actions plugin

xfce4-appfinder

  • Drop libxfce4menu and migrate to garcon
  • Improve keyboard navigation
  • Use startup notification when spawning applications
  • Perhaps implement an extension API, so that xfce4-appfinder can act as a replacement for xfrun4 in the future.

xfce4-panel

  • Finish the completely rewritten panel. This adds a lot of neat features and revamped dialogs. Amongst other things:
  • Introduce an xfconf API for plugins
  • Add an improved launcher plugin based on GIO, garcon and exo-desktop-item-edit
  • Improved transparency support
  • Better panel placement and multi-head support

xfce4-settings

  • Netbook-friendly dialogs
  • Improve keyboard shortcuts (seem to cause a lot of problems)
  • Improve display and pointer settings dialogs
  • Add a clipboard manager daemon
  • Finish/fix the settings editor

xfdesktop

  • Use GIO for the icon view
  • Use garcon for the menu instead of libxfce4menu
  • Improve icon view drawing routines
  • Proper keyboard handling for the icon view
  • Free icon positioning
  • Allow right-click menus to be arranged differently

I think that's it. I hope you enjoy Xfce and are looking forward to the 4.8 release together with us!

Tuesday, September 8 2009

Long Overdue Update

I haven't posted anything in a while, but I'm not complaining. The last month I've been mostly busy pretending to be busy. Ok, to be honest, that's not entirely true. Over at Xfce, we have achieved a lot in August:

  • We've moved all Xfce repositories (including the goodies) over to Git. Kudos to Brian for doing most of the work.
  • All Xfce translation updates are now submitted via Transifex. Thanks to the Transifex developers for all the support and for being such a friendly bunch. It amazes me that Dimitris, the founder of Indifex, is also active on our translations mailing list to support people!
  • The migration of the Thunar core to GIO is complete and has been merged into the main development branch. The overall delta was 2.9MB, although admittedly, a big part of that is due to the removal of ThunarVFS, so I can only take credit for about 16,000 of the 24,335 insertions and 6,000 of the 41,356 deletions.
  • We've kicked off the Xfce 4.8 development cycle on August 16th. The schedule and all other details are available on the wiki. Xfce 4.8 is scheduled for April 12th, 2010. Expect development releases of the various core components soon!

Other things I've been planning to blog about but didn't have the time to:

  • Samuel is still busy setting up Buildbot. With less time than he had hoped for at hands this might still take a while.
  • I was provided with a free Linutop 2 in June. I'd like to thank the Linutop company again for this gift! So far, I've only found the time to give it a few test boots but I'm planning to set it up as a Xfce test machine soon. Its limited hardware makes it much better platform than my rather powerful laptop and/or virtual machines for testing the speed and memory demand of Xfce.
  • My thesis is progressing slowly. I think I have at least 3/4 finished now. I'll keep you posted about the result. I'm hoping to kick off the six month learning phase for my final exams before October because a friend of mine is already waiting for me. ;)

Tuesday, June 16 2009

Preview: Browsing SFTP with Thunar

It feels like I'm finally getting somewhere. My GIO migration branch of Thunar now generates thumbnails using the D-Bus service provided by Tumbler (which is still in development but almost ready for a release). It has no references to ThunarVFS anymore, except for one function required by Thunarx, the Thunar extension library. The next step will be to prepare thunarx-2 with a ThunarVFS-free API. All plugins shipped with Thunar itself need to be updated. ThunarVFS will be moved out of the Thunar tarball and into its own, so that applications depending on it will still work. And then we only need to fork the HAL based volume monitor from GVfs and of course thunar-volman needs to be rewritten on top of GIO ...

Anyway, just a few moments ago, I did something I thought is worth sharing: I browsed one of our servers remotely over SFTP! Mounting still needs to be done from the terminal but after that, you can simply type in the SSH or SFTP URI and it will display its contents. Thumbnails are generated over D-Bus. Here's a screenshot:

Update

Thunar can now mount remote URIs on demand:

FTP browsing also works:

Friday, May 1 2009

Another Thunar/GIO Status Update

I'm more or less done with migrating the volume management code in Thunar to GIO. As of today there's not a single reference to ThunarVfsVolume or ThunarVfsVolume manager in Thunar anymore. While that is pretty neat and another thing I can mark as (almost) done, there are a few quirks also:

  • There's no way to find out whether a volume is removable or not. Actually, there are APIs for that but they don't seem to yield reasonable results for any of my USB and DVD drives.
  • GIO doesn't handle repeatedly issued mount requests too well. If you try mounting a DVD volume several times in a row, you'll end up G_IO_ERROR_FAILED errors exposing private D-Bus error messages. That's nothing the user should be bothered with but unfortunately there's no way to avoid this. G_IO_ERROR_FAILED is an error type you normally want to display. I think in this case raising a G_IO_ERROR_PENDING would be more appropriate.

So what's next? I'll just pick the list from my last post because I'm lazy:

  • Move the thumbnail related code into exo.
  • Load ThunarFile objects asynchronously. This will be a pain. A lot of functions will have to be split up to fit into the asynchronous concept.
  • Migrate Thunarx to GIO.
  • Migrate thunar-volman to GIO.
  • Integrate functionality similar to Gigolo (remote/virtual places management) into the file manager.
  • Write GNOME-independent GIO extensions for volume management and the trash.

I'm not so sure I want to load ThunarFiles asynchronously. It'll only work in some situations anyway. However, the possibility of the loading process blocking the GUI is quite high, especially with remote mounts. I guess the next thing I'll work on (next week) is moving thumbnailing out of Thunar and into exo.

Oh, by the way, here are some boring stats of my work in the past four weeks:

 thunar/Makefile.am                      |   44 +-
 thunar/main.c                           |    8 +
 thunar/thunar-abstract-icon-view.c      |    4 -
 thunar/thunar-application.c             |  655 +++++++--------
 thunar/thunar-application.h             |   25 +-
 thunar/thunar-chooser-button.c          |  131 +--
 thunar/thunar-chooser-dialog.c          |  232 +++---
 thunar/thunar-chooser-model.c           |  450 +++-------
 thunar/thunar-chooser-model.h           |   23 +-
 thunar/thunar-clipboard-manager.c       |   53 +-
 thunar/thunar-clipboard-manager.h       |    3 +-
 thunar/thunar-create-dialog.c           |  155 ++--
 thunar/thunar-create-dialog.h           |   25 +-
 thunar/thunar-dbus-service.c            |   47 +-
 thunar/thunar-debug.c                   |    4 -
 thunar/thunar-deep-count-job.c          |  373 ++++++++
 thunar/thunar-deep-count-job.h          |   48 +
 thunar/thunar-details-view.c            |   20 -
 thunar/thunar-dialogs.c                 |  100 ++-
 thunar/thunar-dialogs.h                 |   42 +-
 thunar/thunar-dnd.c                     |   21 +-
 thunar/thunar-enum-types.c              |   57 ++
 thunar/thunar-enum-types.h              |   56 ++
 thunar/thunar-file.c                    | 1455 +++++++++++++++++++++++--------
 thunar/thunar-file.h                    |  309 ++-----
 thunar/thunar-folder.c                  |  192 +++--
 thunar/thunar-gio-extensions.c          |  355 ++++++++
 thunar/thunar-gio-extensions.h          |   63 ++
 thunar/thunar-gtk-extensions.c          |    4 -
 thunar/thunar-icon-factory.c            |   13 +-
 thunar/thunar-io-jobs-util.c            |  139 +++
 thunar/thunar-io-jobs-util.h            |   36 +
 thunar/thunar-io-jobs.c                 | 1074 +++++++++++++++++++++++
 thunar/thunar-io-jobs.h                 |   54 ++
 thunar/thunar-io-scan-directory.c       |  123 +++
 thunar/thunar-io-scan-directory.h       |   37 +
 thunar/thunar-job.c                     | 1001 +++++++++++++++++++++
 thunar/thunar-job.h                     |  112 +++
 thunar/thunar-launcher.c                |  521 +++++++-----
 thunar/thunar-list-model.c              |  155 ++--
 thunar/thunar-location-button.c         |   29 +-
 thunar/thunar-location-buttons.c        |   31 +-
 thunar/thunar-location-entry.c          |  151 +++-
 thunar/thunar-marshal.list              |    4 +
 thunar/thunar-metafile.c                |   42 +-
 thunar/thunar-metafile.h                |    5 +-
 thunar/thunar-path-entry.c              |   65 +-
 thunar/thunar-permissions-chooser.c     |  263 +++---
 thunar/thunar-preferences-dialog.c      |  103 +--
 thunar/thunar-preferences.c             |   71 +-
 thunar/thunar-progress-dialog.c         |  152 ++--
 thunar/thunar-progress-dialog.h         |    7 +-
 thunar/thunar-properties-dialog.c       |  108 ++--
 thunar/thunar-renamer-dialog.c          |   20 +-
 thunar/thunar-renamer-model.c           |   11 +-
 thunar/thunar-sendto-model.c            |  196 ++---
 thunar/thunar-shortcuts-icon-renderer.c |   45 +-
 thunar/thunar-shortcuts-model.c         |  433 +++++-----
 thunar/thunar-shortcuts-view.c          |  594 +++++++++----
 thunar/thunar-simple-job.c              |  223 +++++
 thunar/thunar-simple-job.h              |   64 ++
 thunar/thunar-size-label.c              |   81 +-
 thunar/thunar-standard-view.c           |  212 +++---
 thunar/thunar-templates-action.c        |    7 +-
 thunar/thunar-text-renderer.c           |   19 -
 thunar/thunar-transfer-job.c            |  888 +++++++++++++++++++
 thunar/thunar-transfer-job.h            |   60 ++
 thunar/thunar-trash-action.c            |    9 +-
 thunar/thunar-tree-model.c              |  280 ++++---
 thunar/thunar-tree-view.c               |  730 ++++++++++------
 thunar/thunar-user.c                    |  833 ++++++++++++++++++
 thunar/thunar-user.h                    |   88 ++
 thunar/thunar-util.c                    |  105 ++-
 thunar/thunar-util.h                    |   16 +-
 thunar/thunar-window.c                  |  274 +++---
 75 files changed, 10491 insertions(+), 3947 deletions(-)

The overall size of the patch is 844kb already.

Friday, April 24 2009

Thunar/GIO - Quick Status Report

I've started hacking on the migration of Thunar to GIO on April 9th. In about 61 commits, I've reduced the original number of ThunarVFS references in the Thunar source code dramatically. The most important and probably most time-consuming part of this work is only mentioned briefly on those pages: rewriting all recursive copy/move/trash/restore/chmod/chgrp/chown jobs -- by now most of the jobs have been rewritten based on GIO and the new ThunarJob framework ... and Thunar still works (for me at least)!

All in all, I suppose that about a third of the implementation work is done. Ok, maybe just a quarter, but an important one. I now have a very good overview over the source code and I'm almost done with one of the most critical parts of the migration.

If you want to know how that looks like for me, here's a screenshot:

Lunar Linux 20090423

These are the most important/big things that are still waiting for me:

  • Replace ThunarVFSVolumeManager with GFileMonitor. Volume management is a large and complex subsystem of both ThunarVFS and GIO.
  • Load ThunarFile objects asynchronously. This will be a pain. A lot of functions will have to be split up to fit into the asynchronous concept.
  • Move the thumbnail related code into exo

These two are a bit out of scope but very important nonetheless:

  • Integrate functionality similar to Gigolo (remote/virtual places management) into the file manager.
  • Write GNOME-independent GIO extensions for volume management and the trash.

On a side node: Xubuntu 9.04 is available as of today! Go and grab it if you're interested in a nice distro based on Xfce. If you're interested in the Xubuntu development, you'll be able to meet Stephan, several Xubuntu folks and me at the Ubuntu Developer Summit in Barcelona from May 25th-29th. I'm very excited already!

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