" Vim indent file
" Language: Haml
" Maintainer: Tim Pope <[email protected]>
" Last Change: 2013 May 30

if exists("b:did_indent")
finish
endif
runtime! indent/ruby.vim
unlet! b:did_indent
let b:did_indent = 1

setlocal autoindent sw=2 et
setlocal indentexpr=GetHamlIndent()
setlocal indentkeys=o,O,*<Return>,},],0),!^F,=end,=else,=elsif,=rescue,=ensure,=when

" Only define the function once.
if exists("*GetHamlIndent")
finish
endif

let s:attributes = '\%({.\{-\}}\|\[.\{-\}\]\)'
let s:tag = '\%([%.#][[:alnum:]_-]\+\|'.s:attributes.'\)*[<>]*'

if !exists('g:haml_self_closing_tags')
let g:haml_self_closing_tags = 'base|link|meta|br|hr|img|input'
endif

function! GetHamlIndent()
let lnum = prevnonblank(v:lnum-1)
if lnum == 0
return 0
endif
let line = substitute(getline(lnum),'\s\+$','','')
let cline = substitute(substitute(getline(v:lnum),'\s\+$','',''),'^\s\+','','')
let lastcol = strlen(line)
let line = substitute(line,'^\s\+','','')
let indent = indent(lnum)
let cindent = indent(v:lnum)
if cline =~# '\v^-\s*%(elsif|else|when)>'
let indent = cindent < indent ? cindent : indent - &sw
endif
let increase = indent + &sw
if indent == indent(lnum)
let indent = cindent <= indent ? -1 : increase
endif

let group = synIDattr(synID(lnum,lastcol,1),'name')

if line =~ '^!!!'
return indent
elseif line =~ '^/\%(\[[^]]*\]\)\=$'
return increase
elseif group == 'hamlFilter'
return increase
elseif line =~ '^'.s:tag.'[&!]\=[=~-]\s*\%(\%(if\|else\|elsif\|unless\|case\|when\|while\|until\|for\|begin\|module\|class\|def\)\>\%(.*\<end\>\)\@!\|.*do\%(\s*|[^|]*|\)\=\s*$\)'
return increase
elseif line =~ '^'.s:tag.'[&!]\=[=~-].*,\s*$'
return increase
elseif line == '-#'
return increase
elseif group =~? '\v^(hamlSelfCloser)$' || line =~? '^%\v%('.g:haml_self_closing_tags.')>'
return indent
elseif group =~? '\v^%(hamlTag|hamlAttributesDelimiter|hamlObjectDelimiter|hamlClass|hamlId|htmlTagName|htmlSpecialTagName)$'
return increase
elseif synIDattr(synID(v:lnum,1,1),'name') ==? 'hamlRubyFilter'
return GetRubyIndent()
else
return indent
endif
endfunction

" vim:set sw=2: