| " 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 |