intero

Complete interactive development program for Haskell

Intero for Emacs

Please see the homepage for Intero for Emacs.

Default key bindings

Key binding	Description
M-.	Jump to definition
C-c C-i	Show information of identifier at point
C-c C-t	Show the type of thing at point, or the selection
C-u C-c C-t	Insert a type signature for the thing at point
C-c C-l	Load this module in the REPL
C-c C-c	Evaluate the selected region in the REPL
C-c C-r	Apply suggestions from GHC
C-c C-k	Clear REPL
C-c C-z	Switch to and from the REPL

Install requirements

Make sure you have this package installed on Linux:

libtinfo-dev

(People on other platforms please contribute the equivalent dependency.)

Enabling intero

To enable intero in all haskell-mode buffers by default, enable intero-global-mode, by using M-x customize or by adding (intero-global-mode 1) to your Emacs start-up files.

Intero will then activate for all projects, and for files without a stack.yaml, it will assume the "global" project. If you want to use an alternate stack yaml configuration file (for example, when developing for multiple GHC versions), use M-x intero-stack-yaml to switch file. When switching configuration, you will asked whether you want to preserve this choice across emacs sessions for the given project.

Whitelisting/blacklisting projects

Some users prefer to enable Intero selectively. The custom variables intero-blacklist and intero-whitelist are provided for this purpose, and are honoured by intero-global-mode:

If the parent directory of a Haskell file is listed in intero-blacklist, then intero will not be enabled for that file, unless a parent directory of that file is also listed in intero-whitelist. In other words, whitelist entries take precedence. You can therefore blacklist / to disable intero in all projects unless they are whitelisted.

Intero support for other editors and IDEs

Although not supported by the Intero maintainers, integrations with other editors exist:

• intero-neovim
• haskero (vscode)
• Haskelly (vscode)
• sublime-intero

If you would like to build support into a new editor or IDE, please see TOOLING.md.