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... not having sufficiently good distributed source control systems ...
Agreed. I think that most if not all SC/VC software still have interfaces geared around the mechanics of what they do, rather than around the needs of the user.
For example, the need to go through a 3 stage process of setup to move existing code into them combined with the need to explicitly PUT after modifications.
A system that used the OS change notify mechanism to detect and record changes automatically could be so much better. Setup would be a case of telling it to monitor a subdirectory (tree) for changes. That's it. No copying involved, just a crc check of each of the files and register them for change notifications.
Anytime the file gets changed, it receives a notification and immediately records the deltas in the background; locking the file against writes until it is done. Reads (eg. compiler) continue whilst it works.
DARCS is meant to be good for the distributed side of things; allowing greater flexibility and less traffic for localised changes that only get merged if the need arises. I'll get around to checking it out one day.
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