ghcid 0.4 released

Summary: I've released a new version of ghcid, which is faster and works better for Vim users.

I've just released version 0.4 of ghcid. For those who haven't tried it, it's the simplest/dumbest "IDE" that could possibly exist. It presents a small fixed-height console window that shows the active warnings/errors from ghci, which is updated on every save. While that might not seem like much, there are a number of improvements over a standard workflow:

• You don't have to switch to a different window and hit :reload, just saving in your editor is enough.
• It includes warnings from modules that successfully compiled previously, as opposed to ghci which omits warnings from modules that didn't reload.
• It reformats the messages to the height of your console, so you can see several messages at once.

I find it gives me a significant productivity boost, and since there is no editor integration, it adds to my existing tools, rather than trying to replace them (unlike a real IDE).

Version 0.4 offers a few additional improvements:

• We use fsnotify to watch for changes, rather than polling as in older versions. The result is a significant decrease in battery usage, combined with faster responses to changes.
• If you change the .cabal or .ghci file then ghcid will restart the ghci session to pick up the changes.
• If you are a Vim user, then the sequence of temporary files Vim uses on save could upset ghcid. I believe these issues are now all eliminated.
• The number of errors/warnings is displayed in the titlebar of the console.
• There is a feature to run a test after each successful save (using --test). I am expecting this to be a niche feature, but feel free to prove me wrong.

Tempted to give it a try? See the README for details.