Visualize commit history in Pharo

Overview

This is another GraphViz post for Pharo Smalltalk. A few days ago I committed a working version of GraphBuilder. It was mostly coded by Lukas Renggli and I updated the package to work with the current Pharo images and added minor features (like displaying commit date in the nodes).

Installation and Usage

To install the package, open the Catalog Browser, select and install GraphViz, or evaluate the following expression:

Gofer new
 smalltalkhubUser: 'hernan' project: 'GraphViz';
 package: 'ConfigurationOfGraphViz';
 load.
((Smalltalk at: #ConfigurationOfGraphViz) project version: #stable) load: #('Tools').

The usage is pretty simple and just requires to select the repository to analyze:

GBAncestryBuilder select.

Depending upon the repository selected, it could take some time to complete since it needs to fetch all repository packages (so please, use it with caution).

On completion, two files are generated in the dot subdirectory on the working directory, one for the textual DOT language and the other one in PNG format.

Examples

Follows some outputs from analyzing several repositories:

History of OrderPreservingDictionary, a special class of Dictionary where order is preserved:

Visual history of Connectors, a Morphic package to make connected drawings (you may want to check Roassal for a more updated visualization engine):

And finally, a graph of CommandShell, an Unix command shell simulator for Squeak and Pharo Smalltalk:

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The Smalltalk Family Tree

Introduction : GraphViz in Pharo

GraphViz is a popular free graph visualization library currently used in many applications. In GraphViz you describe a graph in text format and the software draws a pretty picture of the graph.

A GraphViz package for Smalltalk was originally available in Squeak, but it was outdated in the current Pharo releases (3.0). The package facilitates the creation of graph descriptions in the DOT language of the Graphviz graphing tool. You write the graph using the beautiful Smalltalk syntax, and the GraphViz class generates the output in all available formats (dot,svg,png,jpg,gd,etc).

Now I have uploaded a new Metacello Configuration for GraphViz in Pharo 3.0, available in the Configuration Browser. To use it, GraphViz should be installed and present in the PATH environment variable. More useful information can be found in the original repository (Connectors compatibility is still missing until we get a Connectors version which loads in Pharo 3 or 4). The Configuration loads both stable versions of CommandShell and XML-Parser packages.

A Smalltalk Family Tree

I have collected the Smalltalk implementations I know and grouped them in a graph by what could be considered their "family". Some of them are not supported anymore, others are difficult to find or get executed again. Exotic or very old Smalltalks like Bricktalk, DuoTalk, Marvin, etc. were not included because there are too few references on the web. Now by looking at it in perspective, one could understand why Smalltalk is considered the most evolved and state-of-the-art programming environment. Here is the resulting graph :

Smalltalk Family Tree por Hernán Morales Durand se distribuye bajo una Licencia Creative Commons Atribución-NoComercial-SinDerivar 4.0 Internacional.
Basada en una obra en http://80738163270632.blogspot.com/2014/10/the-smalltalk-family-tree.html.

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