95 lines
3.2 KiB
Org Mode
95 lines
3.2 KiB
Org Mode
#+TITLE: Programming Haskell
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#+AUTHOR: Howard X. Abrams
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#+DATE: 2022-08-24
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#+FILETAGS: :emacs:
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A literate programming file for configuring Emacs to use [[https://www.haskell.org/][Haskell]] .
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#+begin_src emacs-lisp :exports none
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;;; ha-programming-haskell --- configuring for haskell. -*- lexical-binding: t; -*-
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;;
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;; © 2022-2023 Howard X. Abrams
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;; Licensed under a Creative Commons Attribution 4.0 International License.
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;; See http://creativecommons.org/licenses/by/4.0/
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;;
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;; Author: Howard X. Abrams <http://gitlab.com/howardabrams>
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;; Maintainer: Howard X. Abrams
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;; Created: August 24, 2022
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;;
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;; While obvious, GNU Emacs does not include this file or project.
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;;
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;; *NB:* Do not edit this file. Instead, edit the original literate file at:
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;; ~/other/hamacs/ha-programming-haskell.org
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;; And tangle the file to recreate this one.
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;;
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;;; Code:
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#+end_src
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* Introduction
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While “they” claim a [[https://www.haskell.org/tutorial/][Gentle Introduction]], it doesn’t look /fun/. I bought the book, [[http://learnyouahaskell.com/chapters][Learn You a Haskell for Great Good!]], which looks better. Before an /Emacsian/ can dive into a new language, one needs to get an Emacs environment working.
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First, get it installed. On a Mac, do something like:
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#+begin_src sh
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brew install haskell-stack
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#+end_src
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Which installs the [[https://docs.haskellstack.org/][Haskell Stack]] project that is basically an interface to the /kitchen sink/.
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And then run:
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#+begin_src sh
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stack setup
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#+end_src
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And then you get access to an interactive session in a virtual environment with:
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#+begin_src sh
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stack ghci
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#+end_src
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* Haskell Mode
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Seems that the venerable [[https://github.com/haskell/haskell-mode][haskell-mode]] is the best.
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#+begin_src emacs-lisp
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(use-package haskell-mode
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:custom
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(haskell-process-type 'stack-ghci))
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#+end_src
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See [[https://input-output-hk.github.io/adrestia/resources/Emacs][this configuration]] for some advanced features.
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The [[https://github.com/mihaimaruseac/hindent][hindent package]] looks interesting:
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#+begin_src emacs-lisp
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(use-package hindent
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:custom (hindent-style "johan-tibell")
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:hook (haskell-mode . #'hindent-mode))
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#+end_src
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* Haskell and Org
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#+begin_src emacs-lisp
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(use-package ob-haskell
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:straight (:type built-in)
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:config
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(add-to-list 'org-babel-load-languages '(haskell . t)))
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#+end_src
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And let’s see if this works:
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#+begin_src haskell :results replace value
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nums = filter (> 2) [1 .. 5]
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zip nums ['a' .. 'e']
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#+end_src
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#+RESULTS:
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| 3 | a |
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| 4 | b |
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| 5 | c |
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* Technical Artifacts :noexport:
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Let's =provide= a name so we can =require= this file:
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#+begin_src emacs-lisp :exports none
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(provide 'ha-programming-haskell)
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;;; ha-programming-haskell.el ends here
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#+end_src
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#+DESCRIPTION: configuring Emacs.
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#+PROPERTY: header-args:sh :tangle no
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#+PROPERTY: header-args:emacs-lisp :tangle yes
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#+PROPERTY: header-args :results none :eval no-export :comments no mkdirp yes
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#+OPTIONS: num:nil toc:nil todo:nil tasks:nil tags:nil date:nil
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#+OPTIONS: skip:nil author:nil email:nil creator:nil timestamp:nil
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#+INFOJS_OPT: view:nil toc:nil ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
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