#390: add cabal unpack command ---------------------------------+------------------------------------------ Reporter: duncan | Owner: Type: enhancement | Status: new Priority: normal | Milestone: Component: cabal-install tool | Version: Severity: normal | Resolution: Keywords: | Difficulty: easy (<4 hours) Ghcversion: 6.8.3 | Platform: ---------------------------------+------------------------------------------ Comment (by duncan): Replying to [comment:3 Saizan]:
I've needed this command a lot lately, so i've written this patch.
There are 2 TODOs there since i wasn't sure what was best from an UI
Yay! The patch looks good too. pov:
When no precise version is specified it defaults to the latest that
match, That's sensible.
should we also take the packagePreferences field in consideration here?
Currently it ignores exceptions (however if something goes wrong the functions involved still print error messages), summarizing failures at
Hmm. Not sure actually. the end like in 'cabal install' is probably what we want. I'd suggest just failing on the first error. So I'd just remove the `try`. Since it does not do anything with dependencies the only time we can have multiple errors is if the user specifies multiple packages to unpack. If the first fails then they'd probably want to deal with that rather than having all the others unpack too (as possibly fail for the same reason). What happens if the user specifies no packages? Getting a helpful error would be nice. -- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/390#comment:4 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects