Vim

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This page intended Haskell vim-users.

Indentation

The following setup from merijn @ #haskell ensures you use spaces not tabs for indentation for generally sane behaviour:

" Tab specific option
set tabstop=8                   "A tab is 8 spaces
set expandtab                   "Always uses spaces instead of tabs
set softtabstop=4               "Insert 4 spaces when tab is pressed
set shiftwidth=4                "An indent is 4 spaces
set smarttab                    "Indent instead of tab at start of line
set shiftround                  "Round spaces to nearest shiftwidth multiple
set nojoinspaces                "Don't convert spaces to tabs

Plugins

Put code in file ~/.vim/plugin/Haskell.vim, or in multiple files in that directory.

Module Sections

The following code prompts for a name, and places a section with that name at current position, when key sequence "--s":

let s:width = 80

function! HaskellModuleSection(...)
    let name = 0 < a:0 ? a:1 : inputdialog("Section name: ")

    return  repeat('-', s:width) . "\n"
    \       . "--  " . name . "\n"
    \       . "\n"

endfunction

nmap <silent> --s "=HaskellModuleSection()<CR>gp

Like so:

--------------------------------------------------------------------------------
--  my section


Module Headers

The following code prompts for module name, a note, a description of module, and places a module comment at top, when key sequence "--h":

let s:width = 80


function! HaskellModuleHeader(...)
    let name = 0 < a:0 ? a:1 : inputdialog("Module: ")
    let note = 1 < a:0 ? a:2 : inputdialog("Note: ")
    let description = 2 < a:0 ? a:3 : inputdialog("Describe this module: ")
    
    return  repeat('-', s:width) . "\n" 
    \       . "-- | \n" 
    \       . "-- Module      : " . name . "\n"
    \       . "-- Note        : " . note . "\n"
    \       . "-- \n"
    \       . "-- " . description . "\n"
    \       . "-- \n"
    \       . repeat('-', s:width) . "\n"
    \       . "\n"

endfunction


nmap <silent> --h "=HaskellModuleHeader()<CR>:0put =<CR>

like so:

--------------------------------------------------------------------------------
-- | 
-- Module      : MyModule
-- Note        : This is a preview
-- 
-- This is an empty module, to show the headercomment produced. 
-- 
--------------------------------------------------------------------------------