Multiple Cabal packages / startup failures

If you have a workspace with multiple Cabal packages, you might want to restart GHCi when those packages change.

If you have something like this in your cabal.project:

packages:
  my-package.cabal
  my-dependency/my-dependency.cabal

Then, to trigger restarts when my-dependency changes, add something like this to your ghciwatch command:

ghciwatch \
    --watch my-dependency \
    --restart-glob 'my-dependency/src/**/*.hs' \
    --restart-glob 'my-dependency/my-dependency.cabal'

Note that you’ll need to specify each dependency manually; Cabal doesn’t expose this information nicely for us to use automatically.

Ghciwatch will wait for a glob match to change if the GHCi session fails to start. If you find it hanging around when you want it to be restarting, try adding to your --restart-glob or --reload-glob arguments.