This Cabal darcs repository contains multiple packages: * Cabal/ -- the Cabal library package * cabal-install/ -- the cabal-install package containing the 'cabal' tool. See the README in each subdir for more details. The canonical upstream repo lives at https://github.com/haskell/cabal
Joachim Breitner
authored
This reduces the runtime of "cabal install --dry-run" on a large cabal file (550 dependencies) from ~12s to 2.1s. Equivalency with previous implementation verified with QuickCheck in ghci. This is a guess: The speedup is mostly due to how to the previous entries are added to the result of the recursive call. Previously, for every entry to be added, the whole result list is mapped over (lots of allocations), and then each tuple is taken apart and reconstructed with a changed right value (again, lots of allocations). The new code assembles a function in an accumulator that represents the required update and applies it where needed, hence building the list and tuples only once.
| Name | Last commit | Last update |
|---|---|---|
| Cabal | ||
| cabal-install | ||
| .gitignore | ||
| HACKING | ||
| LICENSE | ||
| README | ||
| ghc-packages |