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Henrik Lissner de6907aca0 Bump :lang 
200ok-ch/counsel-jq@b14dfc5 -> 200ok-ch/counsel-jq@104c77b
Andersbakken/rtags@b57b360 -> Andersbakken/rtags@e6c7005
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clojure-emacs/clj-refactor.el@9709568 -> clojure-emacs/clj-refactor.el@6db85b3
clojure-emacs/clojure-mode@84ed16c -> clojure-emacs/clojure-mode@75c2889
cython/cython@fcfd16c -> cython/cython@ba6cbed
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emacs-ess/ESS@1baf8bf -> emacs-ess/ESS@a694b26
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emacs-lsp/lsp-java@2600162 -> emacs-lsp/lsp-java@3f1ed17
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..
+dante.el
Merge pull request #2685 from kenranunderscore/change-obsolete-binding
2020-03-09 14:04:25 -04:00
+lsp.el
Bump :lang haskell
2020-10-05 20:56:34 +08:00
autoload.el
lang/haskell: remove intero support
2020-04-14 19:27:33 -04:00
config.el
Remap haskell-mode-jump-to-def-or-tag to +lookup/definition
2020-05-12 20:07:11 -04:00
doctor.el
lang/haskell: remove intero support
2020-04-14 19:27:33 -04:00
packages.el
Bump :lang
2020-10-11 23:20:06 -04:00
README.org
Bump :lang haskell
2020-10-05 20:56:34 +08:00

README.org

lang/haskell

Table of Contents   TOC

Description

This module adds Haskell support, powered by either dante (the default) or LSP (haskell-language-server or ghcide).

  • Code completion (company-ghc)
  • Look up documentation (hoogle)
  • eldoc support (dante)
  • REPL (ghci)
  • Syntax-checking (flycheck)
  • Code navigation (dante)
  • Snippets

External resources

Here are a few resources I've found indispensable in my Haskell adventures:

Module Flags

  • +dante Enables dante; a fork of intero aimed at lightweightedness. It doesn't depend on stack, supports both cabal-only and stack projects, but lacks eldoc support.
  • +ghcide Enables LSP support with ghcide (requires the :tools lsp module).
  • +lsp Enables LSP support with haskell-language-server (requires the :tools lsp module).

Plugins

Prerequisites

Depending on whether you use Dante, haskell-language-server or ghcide, your dependencies will differ:

  • Dante users need cabal, ghc and ghc-mod
  • LSP users need the haskell-language-server LSP server OR ghcide
  • All users will need the hoogle package

Cabal

To use Dante, you need cabal (the haskell package builder) and ghci (the compiler, syntax checker & repl):

MacOS 

brew install cabal-install ghc

Arch Linux 

sudo pacman -S cabal-install ghc

openSUSE 

sudo zypper install cabal-install ghc

LSP (haskell-language-server)

You will need stack and git installed.

You will find a comprehensive instructions for haskell-language-server on its project page, but if you are using ghcup:

ghcup install hls

LSP (ghcide)

See https://github.com/digital-asset/ghcide for install instructions.

Stack

To use LSP, you need stack:

MacOS 

brew install haskell-stack
stack setup

Arch Linux 

sudo pacman -S stack
# Replace pacaur with your AUR package manager of choice
pacaur -S ncurses5-compat-lib
stack setup

openSUSE 

sudo zypper install stack
stack setup

Haskell packages

You'll need to install the following packages using stack or cabal:

  • (Dante users) ghc-mod

    stack install ghc-mod
# or
cabal install ghc-mod

  • hoogle

    cabal update
cabal install happy haskell-src-exts   # ghc-mod/hoogle dependencies
cabal ghc-mod hoogle
# or
stack install ghc-mod
stack install hoogle

And ensure the binaries for these packages are in your PATH, e.g.

# place this in your profile file, like ~/.bash_profile or ~/.zshenv
export PATH="~/.local/bin:$PATH"

Configuration

Using the new-style cabal REPL

haskell-mode will typically detect what REPL to run based on your project (e.g. stack, (old-style) cabal or ghc). If you want the new-style cabal REPL you must set haskell-process-type manually:

(setq haskell-process-type 'cabal-new-repl)

Troubleshooting