The CodeProject news today mentioned the release of the 'L' (little) language which integrates with Tcl/Tk and compiles to Tcl/Tk byte code.
This should be of interest to those looking at the Git Gui and Gitk code, in particular the examples showing code simplification (easire to read/understand).
The project page is at http://www.little-lang.org, with the original L paper (pdf) at http://www.little-lang.org/little.pdf and looks to have some solid documentation.
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Philip