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