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Haskell IDE plugin for Atom editor -
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IDE-Haskell Join the chat at

Welcome to IDE-Haskell plugin for amazing Atom editor! This plugin is intended to help you with development in Haskell.

Implemented features

Haskell project autodetection

IDE-Haskell works only with Haskell projects. When you open Cabal project in Atom, or simply open a Haskell source file, IDE-Haskell will start automatically.

Errors, warnings and linter

After saving the current file the check and linter processes will be executed. After processes are finished the results can be seen in output panel. You can see different kind of results by switching Errors, Warnings and Lints tab buttons. If you click on message's file name in output panel, Atom will open this file and put cursor near problem that triggered output message.

Check results can also be seen in left editor gutter (near line numbers) as icons. If you hover mouse pointer over such an icon, a tooltip will be shown with problem description. Results are highlighted inside editor as well, so you can easily determine where the problem is.

Errors, warnings and linter

Get type/info

You can get type of any expression and get info on any symbol.

There are two options to do so.

First one is to hover mouse pointer over any Haskell source in editor, or any selection. By default, this will show type for expression/selecton under cursor. You can change this behavior to show info for symbol, or disable it completely in IDE-Haskell settings.

Another option is to use keyboard to get type/info under cursor. No default bindings are specified, but you can specify them in IDE-Haskell settings.

See Configuration for more information.

Get type at point


Autocompletion facilities have been moved to autocomplete-haskell package.

Please install it if you want autocompletion.

Code beautify

You can use stylish-haskell utility to indent pragmas, imports and data type definitions. Simply select Prettify from Haskel IDE menu to apply stylish-haskell to current file.

Code beautify


Atom packages:



$ apm install language-haskell haskell-ghc-mod ide-haskell autocomplete-haskell


Package is fully configurable via Edit → Preferences → Packages → ide-haskell → Settings

You will likely need to specify full paths to stylish-haskell, if it is not in your PATH, at the very least.

You might also want look into configuring haskell-ghc-mod: haskell-ghc-mod README


  • Cabal project autodetection
  • Errors, warnings and linter
  • Get type at point
  • Autocompletion
  • Code beautify
  • Jump to definition
  • Who calls and vice versa
  • Interactive REPL
  • Cabal project management
  • Documentation support


Changelog is available here.


Copyright © 2015 Alexander Chaika, Nikolay Yakimov


  • Daniel Beskin
  • John Quigley
  • Luka Horvat

See the for details.

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