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85 lines
2.6 KiB
VimL
85 lines
2.6 KiB
VimL
" Vim indent file
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" Language: PoV-Ray Scene Description Language
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" Maintainer: David Necas (Yeti) <yeti@physics.muni.cz>
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" Last Change: 2017 Jun 13
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" URI: http://trific.ath.cx/Ftp/vim/indent/pov.vim
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" Only load this indent file when no other was loaded.
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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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" Some preliminary settings.
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setlocal nolisp " Make sure lisp indenting doesn't supersede us.
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setlocal indentexpr=GetPoVRayIndent()
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setlocal indentkeys+==else,=end,0]
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" Only define the function once.
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if exists("*GetPoVRayIndent")
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finish
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endif
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" Counts matches of a regexp <rexp> in line number <line>.
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" Doesn't count matches inside strings and comments (as defined by current
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" syntax).
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function! s:MatchCount(line, rexp)
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let str = getline(a:line)
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let i = 0
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let n = 0
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while i >= 0
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let i = matchend(str, a:rexp, i)
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if i >= 0 && synIDattr(synID(a:line, i, 0), "name") !~? "string\|comment"
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let n = n + 1
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endif
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endwhile
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return n
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endfunction
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" The main function. Returns indent amount.
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function GetPoVRayIndent()
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" If we are inside a comment (may be nested in obscure ways), give up
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if synIDattr(synID(v:lnum, indent(v:lnum)+1, 0), "name") =~? "string\|comment"
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return -1
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endif
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" Search backwards for the frist non-empty, non-comment line.
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let plnum = prevnonblank(v:lnum - 1)
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let plind = indent(plnum)
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while plnum > 0 && synIDattr(synID(plnum, plind+1, 0), "name") =~? "comment"
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let plnum = prevnonblank(plnum - 1)
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let plind = indent(plnum)
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endwhile
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" Start indenting from zero
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if plnum == 0
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return 0
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endif
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" Analyse previous nonempty line.
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let chg = 0
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let chg = chg + s:MatchCount(plnum, '[[{(]')
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let chg = chg + s:MatchCount(plnum, '#\s*\%(if\|ifdef\|ifndef\|switch\|while\|macro\|else\)\>')
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let chg = chg - s:MatchCount(plnum, '#\s*end\>')
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let chg = chg - s:MatchCount(plnum, '[]})]')
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" Dirty hack for people writing #if and #else on the same line.
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let chg = chg - s:MatchCount(plnum, '#\s*\%(if\|ifdef\|ifndef\|switch\)\>.*#\s*else\>')
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" When chg > 0, then we opened groups and we should indent more, but when
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" chg < 0, we closed groups and this already affected the previous line,
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" so we should not dedent. And when everything else fails, scream.
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let chg = chg > 0 ? chg : 0
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" Analyse current line
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" FIXME: If we have to dedent, we should try to find the indentation of the
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" opening line.
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let cur = s:MatchCount(v:lnum, '^\s*\%(#\s*\%(end\|else\)\>\|[]})]\)')
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if cur > 0
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let final = plind + (chg - cur) * shiftwidth()
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else
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let final = plind + chg * shiftwidth()
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endif
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return final < 0 ? 0 : final
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endfunction
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