# Logtalk source code history visualization movies

Recently I came across two open-source tools for visualization of the commit history of source code: codeswarm and gource. Both tools support Subversion, the version control software currently used for Logtalk. Before that I used CVS. Unfortunately, the Logtalk Subversion repository only covers development from October 29, 2001 onwards (Logtalk 2.x development started on January, 1998). Even so, using the above tools provide interesting insight into the history of Logtalk for the past eight and a half years. The resulting videos are encoding using the MPEG-4 H264 video codec. I tried to upload the videos to YouTube but the apparently mandatory reconversion produced awful results.

The first video shows the Logtalk code swarm between October 29, 2001 and May 4, 2010 (the date of the latest Logtalk stable release, version 2.39.2):

https://logtalk.org/files/logtalk_code_swarm.mp4

You will notice that the red color, representing commits related to the Prolog config files, often dominates. This is consequence of the lack of strong Prolog standards, which result in spending an inordinate amount of time working around portability issues.

The second video was produced by gource and covers the same time period:

https://logtalk.org/files/logtalk_gource.mp4

This video excels at illustrating all aspects of Logtalk development work other than the Logtalk compiler/runtime itself. The “flashes” where the little green guy seems to touch most files happen when a new Logtalk version is released and I increment the version number in order to begin working on the next release.

A special thanks to the developers of the codeswarm and gource tools.