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How to use hie with Leksah

This document is a work in progress, as is the Leksah integration.

Getting started

git clone https://github.com/haskell/haskell-ide-engine.git
cd haskell-ide-engine
stack install

This will put the hie executable into $HOME/.local/bin/hie.

Get Leksah sources from the hie-integration branch (https://github.com/Leksah/Leksah/tree/hie_integration) and build them. This branch has a dependency on hie-base, one of the submodules of haskell-ide-engine. So one way to build things is to add the directory where you cloned the hie-base sources to the Leksah sandbox or stack file.

Once Leksah is built, you can start it normally. Then go to Tools -> Preferences -> Helper Programs and check the use haskell-ide-engine box, and fill in the path to the executable ($HOME/.local/bin/hie).

Usage

Once the haskell-ide-engine path set in the preferences, the following actions are available:

  • Type: will use the ghcmod:type command to display the type of the selected expression (no need to have a GHCi session running in Leksah)
  • Info: will use the ghcmod:info command to display information of the selected expression
  • Refactor: a few refactorings are available, provided by the hie HaRe plugin. Some like rename or dupdef will ask for the new name. Running the refactoring currently replaces the whole source contents.

Troubleshooting

Some messages are dumped to the Leksah log, so run Leksah in debug mode to see them.