I have made the source code (as well as a pre-loaded image) for Trax available here:
Trax is a general object versioning system for Squeak. As of right now, I've only tried to run it in Squeak 3.9. It also depends on the pinesoft widgets.
If anyone is interested in porting this forward to any other version of squeak, let me know.
Regarding the extension of Trax to store Monticello packages, I had considered storing individual methods in the repository instead of MC packages, but always felt that computing the SHA-1 on potentially a large number of methods when committing a package would be prohibitively expensive (but would have clear space advantages because new versions of packages might only change a few methods). Due to the interest in doing that by someone conversing with me off-list, I reconsidered. Then it occurred to me that you could use the SHA-1 as the source pointer for methods and compute it at the time a method is saved. It also means that you could discard the sources and changes files and simply use a Trax repository for storing method source code. Furthermore, it opens up the possibility of committing objects to a repository that capture and create a content based address (a SHA-1) to the entire bundle of source code in an image. If anyone is interested in working on such an experiment, let me know.
- Stephen
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