Syntax Highlighting and Indentation for Haskell and Cabal
I was unhappy with the Haskell scripts that are shipped with vim, therefore I decided to make my own based on idris-vim.
I hope you find this useful.
- Covers a broader spectrum of keywords
- Highlighting for new features like type families, pattern synonyms, arrow syntax, recursive do, role annotations, QuasiQuotation
- More contextual highlighting (e.g. highlight 'as' or 'family' only in appropriate places)
- Smarter indentation
- Better Cabal support
I recommend using Pathogen for installation. Simply clone
this repo into your
~/.vim/bundle directory and you are ready to go.
cd ~/.vim/bundle git clone https://github.com/neovimhaskell/haskell-vim.git
Be sure that the following lines are in your
syntax on filetype plugin indent on
Copy content into your
To enable the features you would like to use, just add the according line to your
let g:haskell_enable_quantification = 1 " to enable highlighting of `forall` let g:haskell_enable_recursivedo = 1 " to enable highlighting of `mdo` and `rec` let g:haskell_enable_arrowsyntax = 1 " to enable highlighting of `proc` let g:haskell_enable_pattern_synonyms = 1 " to enable highlighting of `pattern` let g:haskell_enable_typeroles = 1 " to enable highlighting of type roles let g:haskell_enable_static_pointers = 1 " to enable highlighting of `static` let g:haskell_backpack = 1 " to enable highlighting of backpack keywords
haskell-vim has an opinionated highlighting. If you do not like that you can switch to
a more traditional mode by setting
Disabling Template Haskell and Quasiquoting syntax is possible by setting
To configure indentation in
haskell-vim you can use the following variables to change indentation depth, just add the according line to your
If you dislike how indentation works you can disable it by setting
Additionally you can use the vim-hindent plugin to achieve automatic indentation using hindent.
let g:haskell_indent_if = 3
if bool >>>then ... >>>else ...
let g:haskell_indent_case = 2
case xs of >> -> ... >>(y:ys) -> ...
let g:haskell_indent_let = 4
let x = 0 in >>>>x
let g:haskell_indent_where = 6
where f :: Int -> Int >>>>>>f x = x
let g:haskell_indent_before_where = 2
let g:haskell_indent_after_bare_where = 2
let g:haskell_indent_do = 3
do x <- a >>>y <- b
let g:haskell_indent_in = 1
let x = 1 >in x
let g:haskell_indent_guard = 2
f x y >>|
haskell-vim also supports an alterative style for
let g:haskell_indent_case_alternative = 1
f xs ys = case xs of >> -> ... >>(y:ys) -> ...
let g:cabal_indent_section = 2(limited to max. 4 spaces)
executable name >>main-is: Main.hs