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" Vim indent file
" Language: Haskell
" Author: motemen <motemen@gmail.com>
" Version: 0.1
" Last Change: 2007-07-25
"
" Modify g:haskell_indent_if and g:haskell_indent_case to
" change indentation for `if'(default 3) and `case'(default 5).
" Example (in .vimrc):
" > let g:haskell_indent_if = 2
if exists('b:did_indent')
finish
endif
let b:did_indent = 1
if !exists('g:haskell_indent_if')
" if bool
" >>>then ...
" >>>else ...
let g:haskell_indent_if = 3
endif
if !exists('g:haskell_indent_case')
" case xs of
" >>>>>[] -> ...
" >>>>>(y:ys) -> ...
let g:haskell_indent_case = 5
endif
setlocal indentexpr=GetHaskellIndent()
setlocal indentkeys=!^F,o,O
function! GetHaskellIndent()
let line = substitute(getline(getpos('.')[1] - 1), '\t', repeat(' ', &tabstop), 'g')
if line =~ '[!#$%&*+./<=>?@\\^|~-]$\|\<do$'
return match(line, '\s*where \zs\|\S') + &shiftwidth
endif
if line =~ '{$'
return match(line, '\s*where \zs\|\S') + &shiftwidth
endif
if line =~ '^\(instance\|class\).*\&.*where$'
return &shiftwidth
endif
if line =~ ')$'
let pos = getpos('.')
normal k$
let paren_end = getpos('.')
normal %
let paren_begin = getpos('.')
call setpos('.', pos)
if paren_begin[1] != paren_end[1]
return paren_begin[2] - 1
endif
endif
if line !~ '\<else\>'
let s = match(line, '\<if\>.*\&.*\zs\<then\>')
if s > 0
return s
endif
let s = match(line, '\<if\>')
if s > 0
return s + g:haskell_indent_if
endif
endif
let s = match(line, '\<do\s\+\zs[^{]\|\<where\s\+\zs\w\|\<let\s\+\zs\S\|^\s*\zs|\s')
if s > 0
return s
endif
let s = match(line, '\<case\>')
if s > 0
return s + g:haskell_indent_case
endif
return match(line, '\S')
endfunction
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