[Haskell-cafe] GHC API arguments via cabal/stack?

[David Turner]

Cabal-helper looks like just the ticket, thanks!
On 11 Mar 2016 12:32, "Daniel Gröber" <dxld at darkboxed.org> wrote:

> On Fri, Mar 11, 2016 at 09:27:40AM +0000, David Turner wrote:
> > I've also briefly contemplated using the Cabal library to read my .cabal
> > file and work out what to do, but I'm unsure that this would work nicely
> > under stack. At least, I'm not sure quite what to do with all the package
> > databases and other stuff that stack does for you.
>
> Using the Cabal library to do this works very well in general, we do
> this in ghc-mod these days. The only way I've seen problems creep up
> so far is if cabal-install is linked against a different version of
> Cabal than your program. If your analysis program doesn't have to work
> on the same cabal dist directory as cabal-install (like ghc-mod does)
> then that's a non problem though.
>
> Anyways we've wrapped all the ugly stuff to work around this problem
> into a library called cabal-helper:
>
> http://hackage.haskell.org/package/cabal-helper/docs/Distribution-Helper.html
>
> Here's a little example program using that library which should do
> what you want:
>
> ```
> import System.Environment
> import System.Directory
> import System.Process
> import Distribution.Helper
> import Data.Char
> import Data.List
>
> main = do
>   [project_dir] <- getArgs
>   setCurrentDirectory project_dir
>   dist_dir <- dropWhileEnd isSpace <$> readProcess "stack" ["path",
> "--dist-dir"] ""
>   print =<< (runQuery (defaultQueryEnv "." dist_dir) $ ghcOptions)
>
> ```
>
> --Daniel
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