Command to install dependencies of a package.

[mornfall]

Something like cabal install-deps or install --deps-only or such. We spoke about this with Duncan and this is the proposed solution to my use-case:

I have a project that basically consists of a simple shebang haskell script (go.hs), which happens to have somewhat obscure dependencies. I am not interested in building a binary out of this script, nor installing it: but I'd like to use cabal to track and automatically install the dependencies for it. Hence, I would provide a cabal file, whose main purpose would be for people to run "cabal install-deps", which would enable them to run ./go.hs directly...

Hopefully it is clear what I mean here... Don't hesitate to prod me if you have better suggestions, or, questions...

[duncan]

It's been pointed out that this is the natural thing to suggest to users when cabal configure fails with missing dependencies.

The alternative is to tell users to do something like:

$ cabal configure
Resolving dependencies...
Configuring foo-1.0...
setup: At least the following dependencies are missing:
bar >= 1.0
cabal: You can install these dependencies with:
  cabal install 'bar >= 1.0'

It would have to give the version constraints appropriately and in quotes to prevent bad things with the shell.

[mornfall]

The attached diff shows a workaround for the problem (based on darcs.cabal, but the idea should be clear).

[duncan]

Patch for this in #697. Above suggestion is interesting too.

[mornfall]

The workaround from 11 months ago does not work with current cabal anymore. The script has gotten considerably uglier, see contrib/install-deps.sh in darcs darcs repo (darcs get  http://darcs.net). A patch to cabal-install is of course better, so we can probably close this as superseded by #697?

[duncan]

This feature is now implemented in cabal-install-0.10. Use:

cabal install blah --only-dependencies

[elga]

*  simyo

[edouard]

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