104 lines
2.5 KiB
VimL
104 lines
2.5 KiB
VimL
" Vim indent file
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" Language: Tcl
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" Maintainer: Chris Heithoff <chrisheithoff@gmail.com>
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" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
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" Last Change: 24 Sep 2021
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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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setlocal indentexpr=GetTclIndent()
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setlocal indentkeys=0{,0},!^F,o,O,0]
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setlocal nosmartindent
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let b:undo_indent = "setl inde< indk< si<"
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if exists("*GetTclIndent")
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finish
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endif
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function s:prevnonblanknoncomment(lnum)
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let lnum = prevnonblank(a:lnum)
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while lnum > 0
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let line = getline(lnum)
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if line !~ '^\s*\(#\|$\)'
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break
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endif
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let lnum = prevnonblank(lnum - 1)
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endwhile
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return lnum
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endfunction
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function s:ends_with_backslash(lnum)
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let line = getline(a:lnum)
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if line =~ '\\\s*$'
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return 1
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else
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return 0
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endif
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endfunction
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function s:count_braces(lnum, count_open)
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let n_open = 0
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let n_close = 0
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let line = getline(a:lnum)
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let pattern = '[{}]'
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let i = match(line, pattern)
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while i != -1
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if synIDattr(synID(a:lnum, i + 1, 0), 'name') !~ 'tcl\%(Comment\|String\)'
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if line[i] == '{'
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let n_open += 1
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elseif line[i] == '}'
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if n_open > 0
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let n_open -= 1
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else
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let n_close += 1
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endif
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endif
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endif
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let i = match(line, pattern, i + 1)
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endwhile
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return a:count_open ? n_open : n_close
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endfunction
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function GetTclIndent()
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let line = getline(v:lnum)
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" Get the line number of the previous non-blank or non-comment line.
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let pnum = s:prevnonblanknoncomment(v:lnum - 1)
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if pnum == 0
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return 0
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endif
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" ..and the previous line before the previous line.
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let pnum2 = s:prevnonblanknoncomment(pnum-1)
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" Default indentation is to preserve the previous indentation.
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let ind = indent(pnum)
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" ...but if previous line introduces an open brace, then increase current line's indentation
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if s:count_braces(pnum, 1) > 0
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let ind += shiftwidth()
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else
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" Look for backslash line continuation on the previous two lines.
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let slash1 = s:ends_with_backslash(pnum)
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let slash2 = s:ends_with_backslash(pnum2)
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if slash1 && !slash2
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" If the previous line begins a line continuation.
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let ind += shiftwidth()
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elseif !slash1 && slash2
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" If two lines ago was the end of a line continuation group of lines.
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let ind -= shiftwidth()
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endif
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endif
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" If the current line begins with a closed brace, then decrease the indentation by one.
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if line =~ '^\s*}'
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let ind -= shiftwidth()
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endif
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return ind
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endfunction
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