gistfile1.txt

$ sudo gem install guard
$ sudo gem install guard-shell

links:
- https://github.com/guard/guard
- https://github.com/guard/guard-shell

Create a file named "Guardfile" in the root of the project and put the following lines in it:

  guard :shell do
      watch(/lib\/.*\.hs/) { |m| `cabal build | grep -v -e "Loading package"` }
  end

Run the following line to start guard:

$ guard

This will read the Guardfile and start watching the .hs files in lib and sub directories and run the cabal build command whenever such a file changes. It will also filter out lines that match "Loading package", since they take up a lot of space.

To exit, type "quit"