The cabal-sort package
If you have a bunch of packages you may want to compile or recompile, then you need an order of compilation that meets the dependencies. Given a number of cabal package files, this program reads all those files and emits them topologically sorted according to their dependencies. This way you can compile many packages at once, say if a very low-level package has changed.
For compiling a couple of packages from their local darcs repositories in the right order, you may run something like
for dir in `find . -name "*.cabal" | fgrep -v _darcs | xargs cabal-sort --info=dir`; do (cd $dir && cabal install); done
For uploading a set of packages to Hackage in the right order you may run
for dir in `find . -name "*.cabal" | fgrep -v _darcs | xargs cabal-sort --info=dir`; do (cd $dir && rm dist/*.tar.gz && cabal sdist && cabal upload dist/*.tar.gz); done
Problem 1: Given packages A, B, C, where C depends on B and B depends on A, and you call
cabal-sort C.cabal A.cabal
then the emitted order of packages may be wrong, because cabal-sort does not get to know the dependency of C on B. Even if the order is correct, B.cabal is missing in the output and thus the list of cabal files cannot immediately be used for a sequence of cabal-install runs.
Problem 2: We ignore flags and merge all dependencies. This may lead to dependency cycles that cannot occur for any flag assignment.
You also have options --parallel and --makefile that support parallel compilation. The first option is for manual parallelization and the second one allows you to compile parallelly using make's -j/--jobs option.
There is a second program called ghc-pkg-dep that finds recursively all packages that a set of packages depends on. Duplicates are eliminated and the packages are given topologically sorted, such that you can use this for recompilation of the packages. The packages must already be registered with ghc-pkg.
ghc-pkg-dep pkgA-0.1 pkgB-2.3 pkgC-0.1.2
On GHC versions before 7.0 ghc-pkg runs quite slowly. In order to not get bored you may run the program with --verbose=2 option.
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|Versions||0.0.1, 0.0.2, 0.0.2.1, 0.0.3, 0.0.3.1, 0.0.4, 0.0.4.1, 0.0.4.2, 0.0.5, 0.0.5.1|
|Dependencies||base (>=2 && <5), bytestring (>=0.9.1 && <0.10), Cabal (>=1.6 && <1.15), containers (>=0.2 && <0.5), directory (>=1 && <1.2), explicit-exception (>=0.1.6 && <0.2), fgl (>=5.4.2 && <5.5), filepath (>=1.1 && <1.4), process (>=1.0 && <1.2), transformers (==0.2.*), utility-ht (>=0.0.5 && <0.1)|
|Author||Henning Thielemann <firstname.lastname@example.org>|
|Maintainer||Henning Thielemann <email@example.com>|
|Source repository||head: darcs get http://code.haskell.org/~thielema/cabal-sort/|
this: darcs get http://code.haskell.org/~thielema/cabal-sort/ --tag 0.0.4
|Uploaded||Fri Feb 10 10:38:01 UTC 2012 by HenningThielemann|
|Downloads||971 total (51 in last 30 days)|
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- cabal-sort-0.0.4.tar.gz [browse] (Cabal source package)
- Package description (included in the package)
For package maintainers and hackage trustees