Haskell Syntax/Indentation

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.

Features

• Covers a broader spectrum of keywords
• Highlighting for new features like type families
• More contextual highlighting (e.g. highlight 'as' or 'family' only in approriate places)
• Smarter indentation

Installation

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/raichoo/haskell-vim.git

Manual Installation

Copy content into your ~/.vim directory.

Be sure that the following lines are in your .vimrc

syntax on
filetype on
filetype plugin indent on

Configuration

Features

• let g:haskell_enable_quantification = 1 to enable highlighting of forall and exists
• let g:haskell_enable_recursivedo = 1 to enable highlighting of mdo and rec
• let g:haskell_enable_arrowsyntax = 1 to enable highlighting of proc

Indentation

To configure indentation in haskell-vim you can use the following variables:

• let g:haskell_indent_if = 3

    if bool
    >>>then ...
    >>>else ...
  

• let g:haskell_indent_case = 5

    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_do = 3

    do x <- a
    >>>y <- b