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477:, p. 2: ‘One of the problems I had with the initial C++ darcs was that I had no unit testing code. Within two weeks of the first darcs record, I started using QuickCheck to test the patch functions, and the same day I fixed a bug that was discovered by QuickCheck. QuickCheck makes it very easy to define properties that functions must have, which are then tested with randomly generated data.’
389:
Darcs has been criticized for its performance issues. This includes challenges related to the merge algorithms of Darcs 1.x, which showed exponential work to merge certain conflicts. Although not resolved completely in the subsequent versions of Darcs, the frequency of exponential merges did show
311:
can be directly done with Darcs with the usual "pull" and "push" commands. In terms of user interface, this means that Darcs has fewer commands. These commands are more interactive: one can choose more precisely which patches they want to exchange with remote repositories.
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version was written in Autumn 2002 and released to the public in April 2003. Darcs 2.0 was released in April 2008 and introduced a more robust repository format, as well as a new patch semantic called "darcs-2", aimed at minimizing exponential
352:
modifies. This means that patches that modify different parts of the code are considered, by default, independent. To address cases when this is not desirable, Darcs enables the user to specify explicit dependencies between patches.
315:
The patches of a repository are linearly ordered. Darcs automatically calculates whether patches can be reordered (an operation called commutation), and how to do it. These calculations implement a so-called "patch theory".
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in June 2002. These discussions didn't lead to any code being committed to Arch, but did lead to the conception of the theory of patches. After writing an initial version of Darcs in
249:. Key features include the ability to choose which changes to accept from other repositories, interaction with either other local (on-disk) repositories or remote repositories via
292:. For the user, a repository can be seen as a set of patches, where each patch is not necessarily ordered with respect to other patches, i.e. the set of patches is only a
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257:, or email, and an unusually interactive interface. The developers also emphasize the use of advanced software tools for verifying correctness: the expressive
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word substitution (typically used in code refactoring, for instance rename all occurrences of "foo" to "bar" in a given file).
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The notion of dependency between patches is defined syntactically. Intuitively, a patch
296:. In many cases patches can be independently transmitted between various repositories.
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Years, where available, indicate the date of first stable release. Systems with names
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Roundy, David (2008-10-21), "prefer recursive acronymn (sic) to embarrassing one",
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Fendt, Robert (January 9, 2009), "DVCS Round-Up: One System to Rule Them All?",
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Darcs evolved out of David Roundy's efforts to design a new patch format for
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Roundy, David (2005), "Darcs: distributed version management in
Haskell",
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Bugs still remain in which merging of recursive conflicts fails.
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are no longer maintained or have planned end-of-life dates.
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Marlow, Simon (March 7, 2007), "Current status of Darcs",
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A Darcs patch can contain changes of the following kinds:
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Since version 2.10, Darcs uses patience diff by default.
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598:
Proceedings of the 2005 ACM SIGPLAN workshop on
Haskell
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enforces some properties, and randomized testing via
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419:Comparison of version control software
278:Darcs Advanced Revision Control System
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272:verifies many others. The name is a
411:Free and open-source software portal
1897:Free software programmed in Haskell
1892:Distributed version control systems
13:
600:, Tallinn, Estonia, pp. 1–4,
16:Distributed version control system
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911:Software Change Manager
606:10.1145/1088348.1088349
527:(mailing list), OSUOSL
92:; 5 months ago
61:; 21 years ago
1320:York Haskell Compiler
438:"Changelog for darcs"
294:partially ordered set
1835:Open-source software
290:first-class citizens
493:(Commit), Darcs Hub
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1790:Simon Peyton Jones
1735:Lennart Augustsson
1690:Real World Haskell
1355:Concurrent Haskell
245:system created by
59:March 3, 2003
35:Original author(s)
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801:(1986, 1990 in C)
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274:recursive acronym
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1075:(via Git) (2014)
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834:AccuRev SCM
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582:Bug Tracker
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