ghcid

Start with default settings

$ ghcid

$ ghcid --target=[file.hs]

$ ghcid --test=[main]

$ ghcid --command="[cabal repl]"

$ ghcid --title

ghcid [options]

ghcid (GHCi daemon) provides rapid Haskell development feedback by running GHCi in the background, watching source files, and automatically reloading on changes. Errors and warnings are displayed immediately.
The tool minimizes the compile-fix-compile cycle by providing instant feedback. It integrates with cabal, stack, and bare GHCi. The --test option runs expressions after successful compilation, enabling continuous testing.

--command CMD

GHCi command to run.

Target to load.

Expression to run after reload.

Additional paths to watch.

Paths that trigger full restart.

Update terminal title with status.

Display help information.

Requires GHCi setup working correctly. Large projects may have reload delays. Watch paths need correct configuration.

ghcid was created by Neil Mitchell to provide fast feedback during Haskell development, becoming a popular development tool in the Haskell ecosystem.

ghci(1), ghc(1), cabal(1)