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Filename : rst.vim
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" Vim indent file
" Language:             reStructuredText Documentation Format
" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
" Latest Revision:      2011-08-03

if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal indentexpr=GetRSTIndent()
setlocal indentkeys=!^F,o,O
setlocal nosmartindent

if exists("*GetRSTIndent")
  finish
endif

let s:itemization_pattern = '^\s*[-*+]\s'
let s:enumeration_pattern = '^\s*\%(\d\+\|#\)\.\s\+'

function GetRSTIndent()
  let lnum = prevnonblank(v:lnum - 1)
  if lnum == 0
    return 0
  endif

  let ind = indent(lnum)
  let line = getline(lnum)

  if line =~ s:itemization_pattern
    let ind += 2
  elseif line =~ s:enumeration_pattern
    let ind += matchend(line, s:enumeration_pattern)
  endif

  let line = getline(v:lnum - 1)

  " Indent :FIELD: lines.  Don’t match if there is no text after the field or
  " if the text ends with a sent-ender.
   if line =~ '^:.\+:\s\{-1,\}\S.\+[^.!?:]$'
     return matchend(line, '^:.\{-1,}:\s\+')
   endif

  if line =~ '^\s*$'
    execute lnum
    call search('^\s*\%([-*+]\s\|\%(\d\+\|#\)\.\s\|\.\.\|$\)', 'bW')
    let line = getline('.')
    if line =~ s:itemization_pattern
      let ind -= 2
    elseif line =~ s:enumeration_pattern
      let ind -= matchend(line, s:enumeration_pattern)
    elseif line =~ '^\s*\.\.'
      let ind -= 3
    endif
  endif

  return ind
endfunction