Thanks for the quick reply - I'll make an attempt to get ghc-mod to be compatible with this. Tim On 11/11/13 11:26, Mikhail Glushenkov wrote:

Hi,

On Sun, Nov 10, 2013 at 11:26 PM, Tim Docker wrote:

...

However since starting to use cabal sandboxes, the generated code ends up in a directory like this:

dist/dist-sandbox-c4c8b1d4/build/autogen/

What is this hashcode for? Is it always generated when using a sandbox? If I have code (like ghc-mod) that needs to access the build directory, how do I work out the value of the hashcode? So that you can use the same add-source dependency with several different sandboxes and also build it standalone. See discussion in https://github.com/haskell/cabal/issues/1281

As to how generate the hash code yourself, the relevant part of the source code is https://github.com/haskell/cabal/blob/master/cabal-install/Distribution/Clie... That function takes the absolute path to the current sandbox ('/path/to/.cabal-sandbox') as input.