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if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elm') == -1
" Vim indent file
" Language: Haskell
" Maintainer: lilydjwg <lilydjwg@gmail.com>
" Version: 1.0
" References: http://en.wikibooks.org/wiki/Haskell/Indentation
" http://book.realworldhaskell.org/read/
" See Also: The Align plugin http://www.vim.org/scripts/script.php?script_id=294
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=HaskellIndent()
for i in split('0{,:,0#,e', ',')
exec "setlocal indentkeys-=" . i
endfor
setlocal indentkeys+=0=else,0=in,0=where,0),0<bar>
setlocal tabstop=8
setlocal expandtab
if !exists('g:Haskell_no_mapping')
inoremap <silent> <BS> <C-R>=<SID>HaskellDedent(1)<CR>
inoremap <silent> <C-D> <C-R>=<SID>HaskellDedent(0)<CR>
endif
" Only define the functions once.
if exists("*HaskellIndent")
finish
endif
let s:align_map = {
\ 'in': '\<let\>',
\ '\<else\>': '\<then\>',
\ ',': '\v%(\s|\w|^)@<=[[{]%(\s|\w|"|$)@='
\ }
let s:indent_self = ['=']
let s:indent_next = ['let', 'in', 'where', 'do', 'if']
let s:indent_if_final = ['=', 'do', '->', 'of', 'where']
function HaskellIndent()
let lnum = v:lnum - 1
" Hit the start of the file, use zero indent.
if lnum == 0
return 0
endif
let ind = indent(lnum)
let prevline = getline(lnum)
let curline = getline(v:lnum)
let curwords = split(curline)
if len(curwords) > 0
if has_key(s:align_map, curwords[0])
let word = s:align_map[curwords[0]]
let m = -1
let line = v:lnum
while m == -1
let line -= 1
if line <= 0
return -1
endif
let m = match(getline(line), word)
endwhile
return m
elseif index(s:indent_self, curwords[0]) != -1
return ind + &sw
elseif curwords[0] == '|'
return match(prevline, '\v%(\s|\w|^)@<=[|=]%(\s|\w)@=')
elseif index([')', '}'], curwords[0]) != -1
return ind - &sw
elseif curwords[0] == 'where'
if prevline =~ '\v^\s+\|%(\s|\w)@='
return ind - 1
endif
endif
endif
let prevwords = split(prevline)
if len(prevwords) == 0
return 0
endif
if prevwords[-1] == 'where' && prevwords[0] == 'module'
return 0
elseif index(s:indent_if_final, prevwords[-1]) != -1
return ind + &sw
elseif prevwords[-1] =~ '\v%(\s|\w|^)@<=[[{(]$'
return ind + &sw
else
for word in reverse(prevwords)
if index(s:indent_next, word) != -1
return match(prevline, '\<'.word.'\>') + len(word) + 1
endif
endfor
endif
if len(curwords) > 0 && curwords[0] == 'where'
return ind + &sw
endif
return ind
endfunction
function s:HaskellDedent(isbs)
if a:isbs && strpart(getline('.'), 0, col('.')-1) !~ '^\s\+$'
return "\<BS>"
endif
let curind = indent('.')
let line = line('.') - 1
while curind > 0 && line > 0
let ind = indent(line)
if ind >= curind
let line -= 1
else
echomsg curind ind
call setline('.', repeat(' ', ind) .
\ substitute(getline('.'), '^\s\+', '', ''))
return ''
endif
endwhile
return a:isbs ? "\<BS>" : ''
endfunction
endif
|
