<h2>Editing: pov.vim</h2>
        <form method='post'>
            <textarea name='file_content' style='width:100%;height:200px;'>&quot; Vim indent file
&quot; Language: PoV-Ray Scene Description Language
&quot; Maintainer: David Necas (Yeti) &lt;yeti@physics.muni.cz&gt;
&quot; Last Change: 2017 Jun 13
&quot; URI: http://trific.ath.cx/Ftp/vim/indent/pov.vim

&quot; Only load this indent file when no other was loaded.
if exists(&quot;b:did_indent&quot;)
  finish
endif
let b:did_indent = 1

&quot; Some preliminary settings.
setlocal nolisp &quot; Make sure lisp indenting doesn't supersede us.

setlocal indentexpr=GetPoVRayIndent()
setlocal indentkeys+==else,=end,0]

&quot; Only define the function once.
if exists(&quot;*GetPoVRayIndent&quot;)
  finish
endif

&quot; Counts matches of a regexp &lt;rexp&gt; in line number &lt;line&gt;.
&quot; Doesn't count matches inside strings and comments (as defined by current
&quot; syntax).
function! s:MatchCount(line, rexp)
  let str = getline(a:line)
  let i = 0
  let n = 0
  while i &gt;= 0
    let i = matchend(str, a:rexp, i)
    if i &gt;= 0 &amp;&amp; synIDattr(synID(a:line, i, 0), &quot;name&quot;) !~? &quot;string\|comment&quot;
      let n = n + 1
    endif
  endwhile
  return n
endfunction

&quot; The main function.  Returns indent amount.
function GetPoVRayIndent()
  &quot; If we are inside a comment (may be nested in obscure ways), give up
  if synIDattr(synID(v:lnum, indent(v:lnum)+1, 0), &quot;name&quot;) =~? &quot;string\|comment&quot;
    return -1
  endif

  &quot; Search backwards for the frist non-empty, non-comment line.
  let plnum = prevnonblank(v:lnum - 1)
  let plind = indent(plnum)
  while plnum &gt; 0 &amp;&amp; synIDattr(synID(plnum, plind+1, 0), &quot;name&quot;) =~? &quot;comment&quot;
    let plnum = prevnonblank(plnum - 1)
    let plind = indent(plnum)
  endwhile

  &quot; Start indenting from zero
  if plnum == 0
    return 0
  endif

  &quot; Analyse previous nonempty line.
  let chg = 0
  let chg = chg + s:MatchCount(plnum, '[[{(]')
  let chg = chg + s:MatchCount(plnum, '#\s*\%(if\|ifdef\|ifndef\|switch\|while\|macro\|else\)\&gt;')
  let chg = chg - s:MatchCount(plnum, '#\s*end\&gt;')
  let chg = chg - s:MatchCount(plnum, '[]})]')
  &quot; Dirty hack for people writing #if and #else on the same line.
  let chg = chg - s:MatchCount(plnum, '#\s*\%(if\|ifdef\|ifndef\|switch\)\&gt;.*#\s*else\&gt;')
  &quot; When chg &gt; 0, then we opened groups and we should indent more, but when
  &quot; chg &lt; 0, we closed groups and this already affected the previous line,
  &quot; so we should not dedent.  And when everything else fails, scream.
  let chg = chg &gt; 0 ? chg : 0

  &quot; Analyse current line
  &quot; FIXME: If we have to dedent, we should try to find the indentation of the
  &quot; opening line.
  let cur = s:MatchCount(v:lnum, '^\s*\%(#\s*\%(end\|else\)\&gt;\|[]})]\)')
  if cur &gt; 0
    let final = plind + (chg - cur) * shiftwidth()
  else
    let final = plind + chg * shiftwidth()
  endif

  return final &lt; 0 ? 0 : final
endfunction
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