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-rw-r--r--runtime/indent/tcl.vim103
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diff --git a/runtime/indent/tcl.vim b/runtime/indent/tcl.vim
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+" Vim indent file
+" Language: Tcl
+" Maintainer: Chris Heithoff <chrisheithoff@gmail.com>
+" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
+" Last Change: 24 Sep 2021
+
+if exists("b:did_indent")
+ finish
+endif
+let b:did_indent = 1
+
+setlocal indentexpr=GetTclIndent()
+setlocal indentkeys=0{,0},!^F,o,O,0]
+setlocal nosmartindent
+
+let b:undo_indent = "setl inde< indk< si<"
+
+if exists("*GetTclIndent")
+ finish
+endif
+
+function s:prevnonblanknoncomment(lnum)
+ let lnum = prevnonblank(a:lnum)
+ while lnum > 0
+ let line = getline(lnum)
+ if line !~ '^\s*\(#\|$\)'
+ break
+ endif
+ let lnum = prevnonblank(lnum - 1)
+ endwhile
+ return lnum
+endfunction
+
+function s:ends_with_backslash(lnum)
+ let line = getline(a:lnum)
+ if line =~ '\\\s*$'
+ return 1
+ else
+ return 0
+ endif
+endfunction
+
+function s:count_braces(lnum, count_open)
+ let n_open = 0
+ let n_close = 0
+ let line = getline(a:lnum)
+ let pattern = '[{}]'
+ let i = match(line, pattern)
+ while i != -1
+ if synIDattr(synID(a:lnum, i + 1, 0), 'name') !~ 'tcl\%(Comment\|String\)'
+ if line[i] == '{'
+ let n_open += 1
+ elseif line[i] == '}'
+ if n_open > 0
+ let n_open -= 1
+ else
+ let n_close += 1
+ endif
+ endif
+ endif
+ let i = match(line, pattern, i + 1)
+ endwhile
+ return a:count_open ? n_open : n_close
+endfunction
+
+function GetTclIndent()
+ let line = getline(v:lnum)
+
+ " Get the line number of the previous non-blank or non-comment line.
+ let pnum = s:prevnonblanknoncomment(v:lnum - 1)
+ if pnum == 0
+ return 0
+ endif
+
+ " ..and the previous line before the previous line.
+ let pnum2 = s:prevnonblanknoncomment(pnum-1)
+
+ " Default indentation is to preserve the previous indentation.
+ let ind = indent(pnum)
+
+ " ...but if previous line introduces an open brace, then increase current line's indentation
+ if s:count_braces(pnum, 1) > 0
+ let ind += shiftwidth()
+ else
+ " Look for backslash line continuation on the previous two lines.
+ let slash1 = s:ends_with_backslash(pnum)
+ let slash2 = s:ends_with_backslash(pnum2)
+ if slash1 && !slash2
+ " If the previous line begins a line continuation.
+ let ind += shiftwidth()
+ elseif !slash1 && slash2
+ " If two lines ago was the end of a line continuation group of lines.
+ let ind -= shiftwidth()
+ endif
+ endif
+
+ " If the current line begins with a closed brace, then decrease the indentation by one.
+ if line =~ '^\s*}'
+ let ind -= shiftwidth()
+ endif
+
+ return ind
+endfunction