Merge remote-tracking branch 'upstream/master' into rahm

58 files changed, 761 insertions, 120 deletions

diff --git a/runtime/indent/README.txt b/runtime/indent/README.txt
index 8b114365c6..649870636e 100644
--- a/runtime/indent/README.txt
+++ b/runtime/indent/README.txt
@@ -31,7 +31,7 @@ Always use ":setlocal" to set 'indentexpr'.  This avoids it being carried over
 to other buffers.
 
 To trigger the indenting after typing a word like "endif", add the word to the
-'cinkeys' option with "+=".
+'indentkeys' option with "+=".
 
 You normally set 'indentexpr' to evaluate a function and then define that
 function.  That function only needs to be defined once for as long as Vim is
diff --git a/runtime/indent/ada.vim b/runtime/indent/ada.vim
index 6c8ab05267..582d033b23 100644
--- a/runtime/indent/ada.vim
+++ b/runtime/indent/ada.vim
@@ -16,6 +16,7 @@
 "		15.10.2006 MK Bram's suggestion for runtime integration
 "		05.11.2006 MK Bram suggested to save on spaces
 "		19.09.2007 NO g: missing before ada#Comment
+"		2022 April: b:undo_indent added by Doug Kearns
 "    Help Page: ft-vim-indent
 "------------------------------------------------------------------------------
 " ToDo:
@@ -35,6 +36,8 @@ setlocal indentexpr=GetAdaIndent()
 setlocal indentkeys-=0{,0}
 setlocal indentkeys+=0=~then,0=~end,0=~elsif,0=~when,0=~exception,0=~begin,0=~is,0=~record
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the functions once.
 if exists("*GetAdaIndent")
    finish
diff --git a/runtime/indent/awk.vim b/runtime/indent/awk.vim
index e65331977c..cf8132241c 100644
--- a/runtime/indent/awk.vim
+++ b/runtime/indent/awk.vim
@@ -24,6 +24,7 @@
 " 29-04-2002 Fixed problems in function headers and max line width
 "	     Added support for two-line if's without curly braces
 " Fixed hang: 2011 Aug 31
+" 2022 April: b:undo_indent added by Doug Kearns
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -36,6 +37,8 @@ setlocal indentexpr=GetAwkIndent()
 " Mmm, copied from the tcl indent program. Is this okay?
 setlocal indentkeys-=:,0#
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists("*GetAwkIndent")
     finish
diff --git a/runtime/indent/basic.vim b/runtime/indent/basic.vim
new file mode 100644
index 0000000000..7228772251
--- /dev/null
+++ b/runtime/indent/basic.vim
@@ -0,0 +1,11 @@
+" Vim indent file
+" Language:	BASIC (QuickBASIC 4.5)
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2022 Jan 24
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+
+runtime! indent/vb.vim
diff --git a/runtime/indent/bst.vim b/runtime/indent/bst.vim
index 47e3058810..3dd8d711a8 100644
--- a/runtime/indent/bst.vim
+++ b/runtime/indent/bst.vim
@@ -1,20 +1,18 @@
 " Vim indent file
 " Language:	bst
 " Author:	Tim Pope <vimNOSPAM@tpope.info>
-" $Id: bst.vim,v 1.1 2007/05/05 18:11:12 vimboss Exp $
+" Last Change:	2022 Mar 15
 
 if exists("b:did_indent")
     finish
 endif
 let b:did_indent = 1
 
-setlocal expandtab
 setlocal indentexpr=GetBstIndent(v:lnum)
-"setlocal smartindent
 setlocal cinkeys&
 setlocal cinkeys-=0#
 setlocal indentkeys&
-"setlocal indentkeys+=0%
+let b:undo_indent = 'setlocal indentexpr< cinkeys< indentkeys<'
 
 " Only define the function once.
 if exists("*GetBstIndent")
diff --git a/runtime/indent/cdl.vim b/runtime/indent/cdl.vim
index 0e3c6152b0..2c0fc7988e 100644
--- a/runtime/indent/cdl.vim
+++ b/runtime/indent/cdl.vim
@@ -1,7 +1,7 @@
 " Description:	Comshare Dimension Definition Language (CDL)
 " Maintainer:	Raul Segura Acevedo <raulseguraaceved@netscape.net> (Invalid email address)
 " 		Doug Kearns <dougkearns@gmail.com>
-" Last Change:	Fri Nov 30 13:35:48  2001 CST
+" Last Change:	2022 Apr 06
 
 if exists("b:did_indent")
     "finish
@@ -12,6 +12,8 @@ setlocal indentexpr=CdlGetIndent(v:lnum)
 setlocal indentkeys&
 setlocal indentkeys+==~else,=~endif,=~then,;,),=
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists("*CdlGetIndent")
     "finish
diff --git a/runtime/indent/chaiscript.vim b/runtime/indent/chaiscript.vim
index 445281cc46..b7a3fe5896 100644
--- a/runtime/indent/chaiscript.vim
+++ b/runtime/indent/chaiscript.vim
@@ -1,6 +1,7 @@
 " Vim indent file
 " Language:     ChaiScript
 " Maintainer:	Jason Turner <lefticus 'at' gmail com>
+" Last Change: 	2022 Apr 06
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -11,6 +12,8 @@ let b:did_indent = 1
 setlocal indentexpr=GetChaiScriptIndent()
 setlocal autoindent
 
+let b:undo_indent = "setl ai< inde<"
+
 " Only define the function once.
 if exists("*GetChaiScriptIndent")
   finish
diff --git a/runtime/indent/clojure.vim b/runtime/indent/clojure.vim
index fadcaf4b4a..5bfbfbb197 100644
--- a/runtime/indent/clojure.vim
+++ b/runtime/indent/clojure.vim
@@ -5,7 +5,7 @@
 "                     Meikel Brandmeyer <mb@kotka.de>
 " URL:                https://github.com/clojure-vim/clojure.vim
 " License:            Vim (see :h license)
-" Last Change:        2021-10-26
+" Last Change:        2022-03-24
 
 if exists("b:did_indent")
 	finish
diff --git a/runtime/indent/cmake.vim b/runtime/indent/cmake.vim
index 845bdd7655..af27c0d49b 100644
--- a/runtime/indent/cmake.vim
+++ b/runtime/indent/cmake.vim
@@ -3,7 +3,7 @@
 " Author:       Andy Cedilnik <andy.cedilnik@kitware.com>
 " Maintainer:   Dimitri Merejkowsky <d.merej@gmail.com>
 " Former Maintainer: Karthik Krishnan <karthik.krishnan@kitware.com>
-" Last Change:  2017 Sep 24
+" Last Change:  2022 Apr 06
 "
 " Licence:      The CMake license applies to this file. See
 "               https://cmake.org/licensing
@@ -17,6 +17,8 @@ let b:did_indent = 1
 setlocal indentexpr=CMakeGetIndent(v:lnum)
 setlocal indentkeys+==ENDIF(,ENDFOREACH(,ENDMACRO(,ELSE(,ELSEIF(,ENDWHILE(
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists("*CMakeGetIndent")
   finish
diff --git a/runtime/indent/cs.vim b/runtime/indent/cs.vim
index 76c12efecf..acc3ba75d5 100644
--- a/runtime/indent/cs.vim
+++ b/runtime/indent/cs.vim
@@ -3,13 +3,10 @@
 " Maintainer:          Nick Jensen <nickspoon@gmail.com>
 " Former Maintainers:  Aquila Deus
 "                      Johannes Zellner <johannes@zellner.org>
-" Last Change:         2018-11-21
-" Filenames:           *.cs
+" Last Change:         2020-03-26
 " License:             Vim (see :h license)
 " Repository:          https://github.com/nickspoons/vim-cs
-"
 
-" Only load this indent file when no other was loaded.
 if exists('b:did_indent')
   finish
 endif
@@ -22,19 +19,23 @@ set cpoptions&vim
 setlocal indentexpr=GetCSIndent(v:lnum)
 
 function! s:IsCompilerDirective(line)
-  return a:line =~? '^\s*#'
+  " Exclude #region and #endregion - these should be indented normally
+  return a:line =~# '^\s*#' && !s:IsRegionDirective(a:line)
+endf
+
+function! s:IsRegionDirective(line)
+  return a:line =~# '^\s*#\s*region' || a:line =~# '^\s*#\s*endregion'
 endf
 
 function! s:IsAttributeLine(line)
-  return a:line =~? '^\s*\[[A-Za-z]' && a:line =~? '\]$'
+  return a:line =~# '^\s*\[[A-Za-z]' && a:line =~# '\]$'
 endf
 
 function! s:FindPreviousNonCompilerDirectiveLine(start_lnum)
   for delta in range(0, a:start_lnum)
     let lnum = a:start_lnum - delta
     let line = getline(lnum)
-    let is_directive = s:IsCompilerDirective(line)
-    if !is_directive
+    if !s:IsCompilerDirective(line) && !s:IsRegionDirective(line)
       return lnum
     endif
   endfor
@@ -58,8 +59,9 @@ function! GetCSIndent(lnum) abort
   let lnum = s:FindPreviousNonCompilerDirectiveLine(a:lnum - 1)
   let previous_code_line = getline(lnum)
   if s:IsAttributeLine(previous_code_line)
-    let ind = indent(lnum)
-    return ind
+    return indent(lnum)
+  elseif s:IsRegionDirective(this_line)
+    return cindent(lnum)
   else
     return cindent(a:lnum)
   endif
diff --git a/runtime/indent/d.vim b/runtime/indent/d.vim
index 57f9125890..80c9a2f559 100644
--- a/runtime/indent/d.vim
+++ b/runtime/indent/d.vim
@@ -2,7 +2,7 @@
 " Language:	D
 " Maintainer:	Jason Mills <jmills@cs.mun.ca> (Invalid email address)
 " 		Doug Kearns <dougkearns@gmail.com>
-" Last Change:	2005 Nov 22
+" Last Change:	2022 Apr 06
 " Version:	0.1
 "
 " Please email me with bugs, comments, and suggestion. Put vim in the subject
@@ -19,4 +19,6 @@ let b:did_indent = 1
 " D indenting is a lot like the built-in C indenting.
 setlocal cindent
 
+let b:undo_indent = "setl cin<"
+
 " vim: ts=8 noet
diff --git a/runtime/indent/dictconf.vim b/runtime/indent/dictconf.vim
index 2e15c76146..fa40585a92 100644
--- a/runtime/indent/dictconf.vim
+++ b/runtime/indent/dictconf.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:             dict(1) configuration file
 " Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Last Change:      	2022 Apr 06
 
 if exists("b:did_indent")
   finish
@@ -11,3 +11,5 @@ let b:did_indent = 1
 setlocal indentkeys=0{,0},!^F,o,O cinwords= autoindent smartindent
 setlocal nosmartindent
 inoremap <buffer> # X#
+
+let b:undo_indent = "setl ai< cinw< indk< si< | silent! iunmap <buffer> #"
diff --git a/runtime/indent/dictdconf.vim b/runtime/indent/dictdconf.vim
index 5c4fbdafb5..5c0e7c566c 100644
--- a/runtime/indent/dictdconf.vim
+++ b/runtime/indent/dictdconf.vim
@@ -11,3 +11,5 @@ let b:did_indent = 1
 setlocal indentkeys=0{,0},!^F,o,O cinwords= autoindent smartindent
 setlocal nosmartindent
 inoremap <buffer> # X#
+
+let b:undo_indent = "setl ai< cinw< indk< si< | silent! iunmap <buffer> #"
diff --git a/runtime/indent/dtd.vim b/runtime/indent/dtd.vim
index c2b3c0c58e..9fca296c0b 100644
--- a/runtime/indent/dtd.vim
+++ b/runtime/indent/dtd.vim
@@ -4,6 +4,12 @@
 " Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
 " Last Change:		24 Sep 2021
 
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
 setlocal indentexpr=GetDTDIndent()
 setlocal indentkeys=!^F,o,O,>
 setlocal nosmartindent
diff --git a/runtime/indent/dylan.vim b/runtime/indent/dylan.vim
index 55255ddfa9..e2a6d1039c 100644
--- a/runtime/indent/dylan.vim
+++ b/runtime/indent/dylan.vim
@@ -3,7 +3,7 @@
 " Maintainer:	Brent A. Fulgham <bfulgham@debian.org> (Invalid email address)
 " 		Doug Kearns <dougkearns@gmail.com>
 " Version:	0.01
-" Last Change:	2017 Jun 13
+" Last Change:	2022 Apr 06
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -15,6 +15,9 @@ setlocal indentkeys+==~begin,=~block,=~case,=~cleanup,=~define,=~end,=~else,=~el
 
 " Define the appropriate indent function but only once
 setlocal indentexpr=DylanGetIndent()
+
+let b:undo_indent = "setl inde< indk<"
+
 if exists("*DylanGetIndent")
   finish
 endif
diff --git a/runtime/indent/falcon.vim b/runtime/indent/falcon.vim
index 664ad61aa5..a58ccad870 100644
--- a/runtime/indent/falcon.vim
+++ b/runtime/indent/falcon.vim
@@ -3,6 +3,7 @@
 " Maintainer: Steven Oliver <oliver.steven@gmail.com>
 " Website: https://steveno@github.com/steveno/falconpl-vim.git
 " Credits: This is, to a great extent, a copy n' paste of ruby.vim.
+"		2022 April: b:undo_indent added by Doug Kearns
 
 " 1. Setup {{{1
 " ============
@@ -20,6 +21,8 @@ setlocal indentexpr=FalconGetIndent(v:lnum)
 setlocal indentkeys=0{,0},0),0],!^F,o,O,e
 setlocal indentkeys+==~case,=~catch,=~default,=~elif,=~else,=~end,=~\"
 
+let b:undo_indent = "setl inde< indk< si<"
+
 " Define the appropriate indent function but only once
 if exists("*FalconGetIndent")
     finish
diff --git a/runtime/indent/fennel.vim b/runtime/indent/fennel.vim
new file mode 100644
index 0000000000..e12aa18a8a
--- /dev/null
+++ b/runtime/indent/fennel.vim
@@ -0,0 +1,12 @@
+" Vim indent file
+" Language:    Fennel
+" Maintainer:  Gregory Anders <greg[NOSPAM]@gpanders.com>
+" Last Change: 2022 Apr 20
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+
+" Use the Lisp indenting
+runtime! indent/lisp.vim
diff --git a/runtime/indent/fortran.vim b/runtime/indent/fortran.vim
index 26ed33a54d..9623014818 100644
--- a/runtime/indent/fortran.vim
+++ b/runtime/indent/fortran.vim
@@ -1,13 +1,13 @@
 " Vim indent file
 " Language:	Fortran 2008 (and older: Fortran 2003, 95, 90, and 77)
-" Version:	(v48) 2020 October 07
-" Maintainer:	Ajit J. Thakkar <ajit@unb.ca>; <http://www2.unb.ca/~ajit/>
+" Version:	(v49) 2022 May 14
+" Maintainer:	Ajit J. Thakkar <thakkar.ajit@gmail.com>; <http://www2.unb.ca/~ajit/>
 " Usage:	For instructions, do :help fortran-indent from Vim
 " Credits:
 "  Version 0.1 was created in September 2000 by Ajit Thakkar.
 "  Since then, useful suggestions and contributions have been made, in order, by:
 "  Albert Oliver Serra, Takuya Fujiwara, Philipp Edelmann, Eisuke Kawashima,
-"  and Louis Cochen.
+"  Louis Cochen, and Doug Kearns.
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -17,6 +17,7 @@ let b:did_indent = 1
 
 let s:cposet=&cpoptions
 set cpoptions&vim
+let b:undo_indent = "setl inde< indk<"
 
 setlocal indentkeys+==~end,=~case,=~if,=~else,=~do,=~where,=~elsewhere,=~select
 setlocal indentkeys+==~endif,=~enddo,=~endwhere,=~endselect,=~elseif
diff --git a/runtime/indent/freebasic.vim b/runtime/indent/freebasic.vim
new file mode 100644
index 0000000000..248b928635
--- /dev/null
+++ b/runtime/indent/freebasic.vim
@@ -0,0 +1,11 @@
+" Vim indent file
+" Language:	FreeBASIC
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2022 Jan 24
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+
+runtime! indent/vb.vim
diff --git a/runtime/indent/gitolite.vim b/runtime/indent/gitolite.vim
index b36f30a494..22be6872cb 100644
--- a/runtime/indent/gitolite.vim
+++ b/runtime/indent/gitolite.vim
@@ -4,7 +4,7 @@
 "	(https://raw.githubusercontent.com/sitaramc/gitolite/master/contrib/vim/indent/gitolite.vim)
 " Maintainer:	Sitaram Chamarty <sitaramc@gmail.com>
 " (former Maintainer:	Teemu Matilainen <teemu.matilainen@iki.fi>)
-" Last Change:	2017 Oct 05
+" Last Change:	2022 Apr 06
 
 if exists("b:did_indent")
   finish
@@ -15,6 +15,8 @@ setlocal autoindent
 setlocal indentexpr=GetGitoliteIndent()
 setlocal indentkeys=o,O,*<Return>,!^F,=repo,\",=
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 " Only define the function once.
 if exists("*GetGitoliteIndent")
   finish
diff --git a/runtime/indent/haml.vim b/runtime/indent/haml.vim
index baca1d49d9..acd99d9c7d 100644
--- a/runtime/indent/haml.vim
+++ b/runtime/indent/haml.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	Haml
 " Maintainer:	Tim Pope <vimNOSPAM@tpope.org>
-" Last Change:	2019 Dec 05
+" Last Change:	2022 Mar 15
 
 if exists("b:did_indent")
   finish
@@ -14,6 +14,8 @@ setlocal autoindent
 setlocal indentexpr=GetHamlIndent()
 setlocal indentkeys=o,O,*<Return>,},],0),!^F,=end,=else,=elsif,=rescue,=ensure,=when
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 " Only define the function once.
 if exists("*GetHamlIndent")
   finish
diff --git a/runtime/indent/html.vim b/runtime/indent/html.vim
index d4b91f6421..a3c32d6342 100644
--- a/runtime/indent/html.vim
+++ b/runtime/indent/html.vim
@@ -1,7 +1,7 @@
 " Vim indent script for HTML
 " Maintainer:	Bram Moolenaar
 " Original Author: Andy Wokula <anwoku@yahoo.de>
-" Last Change:	2021 Jun 13
+" Last Change:	2022 Jan 31
 " Version:	1.0 "{{{
 " Description:	HTML indent script with cached state for faster indenting on a
 "		range of lines.
@@ -149,6 +149,15 @@ func HtmlIndent_CheckUserSettings()
       let b:html_indent_line_limit = 200
     endif
   endif
+
+  if exists('b:html_indent_attribute')
+    let b:hi_attr_indent = b:html_indent_attribute
+  elseif exists('g:html_indent_attribute')
+    let b:hi_attr_indent = g:html_indent_attribute
+  else
+    let b:hi_attr_indent = 2
+  endif
+
 endfunc "}}}
 
 " Init Script Vars
@@ -946,11 +955,11 @@ func s:InsideTag(foundHtmlString)
       let idx = match(text, '<' . s:tagname . '\s\+\zs\w')
     endif
     if idx == -1
-      " after just "<tag" indent two levels more
+      " after just "<tag" indent two levels more by default
       let idx = match(text, '<' . s:tagname . '$')
       if idx >= 0
 	call cursor(lnum, idx + 1)
-	return virtcol('.') - 1 + shiftwidth() * 2
+	return virtcol('.') - 1 + shiftwidth() * b:hi_attr_indent
       endif
     endif
     if idx > 0
diff --git a/runtime/indent/idlang.vim b/runtime/indent/idlang.vim
index e6a1d73775..1519865ab5 100644
--- a/runtime/indent/idlang.vim
+++ b/runtime/indent/idlang.vim
@@ -2,7 +2,7 @@
 " Language:	IDL (ft=idlang)
 " Maintainer:	Aleksandar Jelenak <ajelenak AT yahoo.com> (Invalid email address)
 " 		Doug Kearns <dougkearns@gmail.com>
-" Last change:	2017 Jun 13
+" Last change:	2022 Apr 06
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -14,6 +14,8 @@ setlocal indentkeys=o,O,0=endif,0=ENDIF,0=endelse,0=ENDELSE,0=endwhile,0=ENDWHIL
 
 setlocal indentexpr=GetIdlangIndent(v:lnum)
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists("*GetIdlangIndent")
    finish
diff --git a/runtime/indent/julia.vim b/runtime/indent/julia.vim
index a90cff49e4..8e4c60322e 100644
--- a/runtime/indent/julia.vim
+++ b/runtime/indent/julia.vim
@@ -2,9 +2,15 @@
 " Language:	Julia
 " Maintainer:	Carlo Baldassi <carlobaldassi@gmail.com>
 " Homepage:	https://github.com/JuliaEditorSupport/julia-vim
-" Last Change:	2016 jun 16
+" Last Change:	2022 Jun 14
 " Notes:        originally based on Bram Molenaar's indent file for vim
 
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
 setlocal autoindent
 
 setlocal indentexpr=GetJuliaIndent()
diff --git a/runtime/indent/krl.vim b/runtime/indent/krl.vim
new file mode 100644
index 0000000000..cc3cbd1abb
--- /dev/null
+++ b/runtime/indent/krl.vim
@@ -0,0 +1,130 @@
+" Vim indent file
+" Language: Kuka Robot Language
+" Maintainer: Patrick Meiser-Knosowski <knosowski@graeffrobotics.de>
+" Version: 3.0.0
+" Last Change: 15. Apr 2022
+" Credits: Based on indent/vim.vim
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal nolisp
+setlocal nocindent
+setlocal nosmartindent
+setlocal autoindent
+setlocal indentexpr=GetKrlIndent()
+setlocal indentkeys=!^F,o,O,=~end,0=~else,0=~case,0=~default,0=~until,0=~continue,=~part
+let b:undo_indent = "setlocal lisp< cindent< smartindent< autoindent< indentexpr< indentkeys<"
+
+if get(g:,'krlSpaceIndent',1)
+  " Use spaces, not tabs, for indention, 2 is enough. 
+  " More or even tabs would waste valuable space on the teach pendant.
+  setlocal softtabstop=2
+  setlocal shiftwidth=2
+  setlocal expandtab
+  setlocal shiftround
+  let b:undo_indent = b:undo_indent." softtabstop< shiftwidth< expandtab< shiftround<"
+endif
+
+" Only define the function once.
+if exists("*GetKrlIndent")
+  finish
+endif
+let s:keepcpo = &cpo
+set cpo&vim
+
+function GetKrlIndent() abort
+
+  let currentLine = getline(v:lnum)
+  if  currentLine =~? '\v^;(\s*(end)?fold>)@!' && !get(g:, 'krlCommentIndent', 0)
+    " If current line has a ; in column 1 and is no fold, keep zero indent.
+    " This may be usefull if code is commented out at the first column.
+    return 0
+  endif
+
+  " Find a non-blank line above the current line.
+  let preNoneBlankLineNum = s:KrlPreNoneBlank(v:lnum - 1)
+  if  preNoneBlankLineNum == 0
+    " At the start of the file use zero indent.
+    return 0
+  endif
+
+  let preNoneBlankLine = getline(preNoneBlankLineNum)
+  let ind = indent(preNoneBlankLineNum)
+
+  " Define add 'shiftwidth' pattern
+  let addShiftwidthPattern =           '\v^\s*('
+  if get(g:, 'krlIndentBetweenDef', 1)
+    let addShiftwidthPattern ..=               '(global\s+)?def(fct|dat)?\s+\$?\w'
+    let addShiftwidthPattern ..=               '|'
+  endif
+  let addShiftwidthPattern   ..=               'if>|while>|for>|loop>'
+  let addShiftwidthPattern   ..=               '|else>'
+  let addShiftwidthPattern   ..=               '|case>|default>'
+  let addShiftwidthPattern   ..=               '|repeat>'
+  let addShiftwidthPattern   ..=               '|skip>|(ptp_)?spline>'
+  let addShiftwidthPattern   ..=               '|time_block\s+(start|part)>'
+  let addShiftwidthPattern   ..=               '|const_vel\s+start>'
+  let addShiftwidthPattern   ..=             ')'
+
+  " Define Subtract 'shiftwidth' pattern
+  let subtractShiftwidthPattern =      '\v^\s*('
+  if get(g:, 'krlIndentBetweenDef', 1)
+    let subtractShiftwidthPattern ..=          'end(fct|dat)?>'
+    let subtractShiftwidthPattern ..=          '|'
+  endif
+  let subtractShiftwidthPattern   ..=          'end(if|while|for|loop)>'
+  let subtractShiftwidthPattern   ..=          '|else>'
+  let subtractShiftwidthPattern   ..=          '|case>|default>|endswitch>'
+  let subtractShiftwidthPattern   ..=          '|until>'
+  let subtractShiftwidthPattern   ..=          '|end(skip|spline)>'
+  let subtractShiftwidthPattern   ..=          '|time_block\s+(part|end)>'
+  let subtractShiftwidthPattern   ..=          '|const_vel\s+end>'
+  let subtractShiftwidthPattern   ..=        ')'
+
+  " Add shiftwidth
+  if preNoneBlankLine =~? addShiftwidthPattern
+    let ind += &sw
+  endif
+
+  " Subtract shiftwidth
+  if currentLine =~? subtractShiftwidthPattern
+    let ind = ind - &sw
+  endif
+
+  " First case after a switch gets the indent of the switch.
+  if currentLine =~? '\v^\s*case>'  
+        \&& preNoneBlankLine =~? '\v^\s*switch>'
+    let ind = ind + &sw
+  endif
+
+  " align continue with the following instruction
+  if currentLine =~? '\v^\s*continue>'  
+        \&& getline(v:lnum + 1) =~? subtractShiftwidthPattern
+    let ind = ind - &sw
+  endif
+
+  return ind
+endfunction
+
+" This function works almost like prevnonblank() but handles &-headers,
+" comments and continue instructions like blank lines
+function s:KrlPreNoneBlank(lnum) abort
+
+  let nPreNoneBlank = prevnonblank(a:lnum)
+
+  while nPreNoneBlank > 0 && getline(nPreNoneBlank) =~? '\v^\s*(\&\w\+|;|continue>)'
+    " Previouse none blank line irrelevant. Look further aback.
+    let nPreNoneBlank = prevnonblank(nPreNoneBlank - 1)
+  endwhile
+
+  return nPreNoneBlank
+endfunction
+
+let &cpo = s:keepcpo
+unlet s:keepcpo
+
+" vim:sw=2 sts=2 et
diff --git a/runtime/indent/liquid.vim b/runtime/indent/liquid.vim
index 7beb0388d1..6fc933797e 100644
--- a/runtime/indent/liquid.vim
+++ b/runtime/indent/liquid.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:     Liquid
 " Maintainer:   Tim Pope <vimNOSPAM@tpope.org>
-" Last Change:	2017 Jun 13
+" Last Change:	2022 Mar 15
 
 if exists('b:did_indent')
   finish
@@ -29,17 +29,19 @@ let b:did_indent = 1
 setlocal indentexpr=GetLiquidIndent()
 setlocal indentkeys=o,O,*<Return>,<>>,{,},0),0],o,O,!^F,=end,=endif,=endunless,=endifchanged,=endcase,=endfor,=endtablerow,=endcapture,=else,=elsif,=when,=empty
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists('*GetLiquidIndent')
   finish
 endif
 
-function! s:count(string,pattern)
+function! s:count(string, pattern) abort
   let string = substitute(a:string,'\C'.a:pattern,"\n",'g')
   return strlen(substitute(string,"[^\n]",'','g'))
 endfunction
 
-function! GetLiquidIndent(...)
+function! GetLiquidIndent(...) abort
   if a:0 && a:1 == '.'
     let v:lnum = line('.')
   elseif a:0 && a:1 =~ '^\d'
@@ -51,13 +53,14 @@ function! GetLiquidIndent(...)
   let lnum = prevnonblank(v:lnum-1)
   let line = getline(lnum)
   let cline = getline(v:lnum)
-  let line  = substitute(line,'\C^\%(\s*{%\s*end\w*\s*%}\)\+','','')
-  let line .= matchstr(cline,'\C^\%(\s*{%\s*end\w*\s*%}\)\+')
-  let cline = substitute(cline,'\C^\%(\s*{%\s*end\w*\s*%}\)\+','','')
+  let line  = substitute(line,'\C^\%(\s*{%-\=\s*end\w*\s*-\=%}\)\+','','')
+  let line  = substitute(line,'\C\%(\s*{%-\=\s*if.\+-\=%}.\+{%-\=\s*endif\s*-\=%}\)\+','','g')
+  let line .= matchstr(cline,'\C^\%(\s*{%-\=\s*end\w*\s*-\=%}\)\+')
+  let cline = substitute(cline,'\C^\%(\s*{%-\=\s*end\w*\s*-\=%}\)\+','','')
   let sw = shiftwidth()
-  let ind += sw * s:count(line,'{%\s*\%(if\|elsif\|else\|unless\|ifchanged\|case\|when\|for\|empty\|tablerow\|capture\)\>')
-  let ind -= sw * s:count(line,'{%\s*end\%(if\|unless\|ifchanged\|case\|for\|tablerow\|capture\)\>')
-  let ind -= sw * s:count(cline,'{%\s*\%(elsif\|else\|when\|empty\)\>')
-  let ind -= sw * s:count(cline,'{%\s*end\w*$')
+  let ind += sw * s:count(line,'{%-\=\s*\%(if\|elsif\|else\|unless\|ifchanged\|case\|when\|for\|empty\|tablerow\|capture\)\>')
+  let ind -= sw * s:count(line,'{%-\=\s*end\%(if\|unless\|ifchanged\|case\|for\|tablerow\|capture\)\>')
+  let ind -= sw * s:count(cline,'{%-\=\s*\%(elsif\|else\|when\|empty\)\>')
+  let ind -= sw * s:count(cline,'{%-\=\s*end\w*$')
   return ind
 endfunction
diff --git a/runtime/indent/make.vim b/runtime/indent/make.vim
index 76c8f83399..4d1838b3aa 100644
--- a/runtime/indent/make.vim
+++ b/runtime/indent/make.vim
@@ -2,7 +2,7 @@
 " Language:		Makefile
 " Maintainer:		Doug Kearns <dougkearns@gmail.com>
 " Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
-" Last Change:		24 Sep 2021
+" Last Change:		2022 Apr 06
 
 if exists("b:did_indent")
   finish
@@ -13,7 +13,7 @@ setlocal indentexpr=GetMakeIndent()
 setlocal indentkeys=!^F,o,O,<:>,=else,=endif
 setlocal nosmartindent
 
-let b:undo_indent = "setl ai< inde< indk<"
+let b:undo_indent = "setl inde< indk< si<"
 
 if exists("*GetMakeIndent")
   finish
diff --git a/runtime/indent/mma.vim b/runtime/indent/mma.vim
index ebf98b9a38..9dbfd74d66 100644
--- a/runtime/indent/mma.vim
+++ b/runtime/indent/mma.vim
@@ -3,6 +3,7 @@
 " Maintainer:	Steve Layland <layland@wolfram.com> (Invalid email address)
 " 		Doug Kearns <dougkearns@gmail.com>
 " Last Change:	Sat May  10 18:56:22 CDT 2005
+"		2022 April: b:undo_indent added by Doug Kearns
 " Source:	http://vim.sourceforge.net/scripts/script.php?script_id=1274
 " 		http://members.wolfram.com/layland/vim/indent/mma.vim
 "
@@ -26,6 +27,8 @@ setlocal indentexpr=GetMmaIndent()
 setlocal indentkeys+=0[,0],0(,0)
 setlocal nosi "turn off smart indent so we don't over analyze } blocks
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetMmaIndent")
     finish
 endif
diff --git a/runtime/indent/nginx.vim b/runtime/indent/nginx.vim
index d4afec1c11..8cef7662e0 100644
--- a/runtime/indent/nginx.vim
+++ b/runtime/indent/nginx.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language: nginx.conf
 " Maintainer: Chris Aumann <me@chr4.org>
-" Last Change: Apr 15, 2017
+" Last Change:  2022 Apr 06
 
 if exists("b:did_indent")
     finish
@@ -15,3 +15,5 @@ setlocal cindent
 
 " Just make sure that the comments are not reset as defs would be.
 setlocal cinkeys-=0#
+
+let b:undo_indent = "setl inde< cin< cink<"
diff --git a/runtime/indent/objc.vim b/runtime/indent/objc.vim
index a5451a5a11..1d107050dd 100644
--- a/runtime/indent/objc.vim
+++ b/runtime/indent/objc.vim
@@ -1,9 +1,7 @@
 "   Vim indent file
 "   Language:	    Objective-C
 "   Maintainer:	    Kazunobu Kuriyama <kazunobu.kuriyama@nifty.com>
-"   Last Change:    2004 May 16
-"
-
+"   Last Change:    2022 Apr 06
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -19,6 +17,8 @@ setlocal indentexpr=GetObjCIndent()
 setlocal indentkeys-=:
 setlocal indentkeys+=<:>
 
+let b:undo_indent = "setl cin< inde< indk<"
+
 " Only define the function once.
 if exists("*GetObjCIndent")
     finish
diff --git a/runtime/indent/occam.vim b/runtime/indent/occam.vim
index 2979ac16ac..673940a7ec 100644
--- a/runtime/indent/occam.vim
+++ b/runtime/indent/occam.vim
@@ -2,7 +2,7 @@
 " Language:	occam
 " Maintainer:	Mario Schweigler <ms44@kent.ac.uk> (Invalid email address)
 " 		Doug Kearns <dougkearns@gmail.com>
-" Last Change:	23 April 2003
+" Last Change:	2022 Apr 06
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -17,6 +17,8 @@ setlocal indentexpr=GetOccamIndent()
 setlocal indentkeys=o,O,0=:
 "}}}
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once
 if exists("*GetOccamIndent")
   finish
diff --git a/runtime/indent/perl.vim b/runtime/indent/perl.vim
index 5fc8b7008a..4c91fa1b33 100644
--- a/runtime/indent/perl.vim
+++ b/runtime/indent/perl.vim
@@ -1,9 +1,10 @@
 " Vim indent file
-" Language:      Perl 5
+" Language:      Perl
 " Maintainer:    vim-perl <vim-perl@googlegroups.com>
 " Homepage:      https://github.com/vim-perl/vim-perl
 " Bugs/requests: https://github.com/vim-perl/vim-perl/issues
-" Last Change:   2020 Apr 15
+" License:       Vim License (see :help license)
+" Last Change:   2021 Sep 24
 
 " Suggestions and improvements by :
 "   Aaron J. Sherman (use syntax for hints)
@@ -35,6 +36,8 @@ if !b:indent_use_syntax
     setlocal indentkeys+=0=EO
 endif
 
+let b:undo_indent = "setl inde< indk<"
+
 let s:cpo_save = &cpo
 set cpo-=C
 
diff --git a/runtime/indent/postscr.vim b/runtime/indent/postscr.vim
index 0691cd237c..8430ccf8b8 100644
--- a/runtime/indent/postscr.vim
+++ b/runtime/indent/postscr.vim
@@ -1,9 +1,7 @@
 " PostScript indent file
 " Language:	PostScript
-" Maintainer:	Mike Williams <mrw@netcomuk.co.uk> (Invalid email address)
-" 		Doug Kearns <dougkearns@gmail.com>
-" Last Change:	2nd July 2001
-"
+" Maintainer:	Mike Williams <mrw@eandem.co.uk>
+" Last Change:	2022 Apr 06
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -14,6 +12,8 @@ let b:did_indent = 1
 setlocal indentexpr=PostscrIndentGet(v:lnum)
 setlocal indentkeys+=0],0=>>,0=%%,0=end,0=restore,0=grestore indentkeys-=:,0#,e
 
+let b:undo_indent = "setl inde< indk<"
+
 " Catch multiple instantiations
 if exists("*PostscrIndentGet")
   finish
diff --git a/runtime/indent/pov.vim b/runtime/indent/pov.vim
index f74c96b7f7..60077ffffe 100644
--- a/runtime/indent/pov.vim
+++ b/runtime/indent/pov.vim
@@ -2,6 +2,7 @@
 " Language: PoV-Ray Scene Description Language
 " Maintainer: David Necas (Yeti) <yeti@physics.muni.cz>
 " Last Change: 2017 Jun 13
+"              2022 April: b:undo_indent added by Doug Kearns
 " URI: http://trific.ath.cx/Ftp/vim/indent/pov.vim
 
 " Only load this indent file when no other was loaded.
@@ -16,6 +17,8 @@ setlocal nolisp " Make sure lisp indenting doesn't supersede us.
 setlocal indentexpr=GetPoVRayIndent()
 setlocal indentkeys+==else,=end,0]
 
+let b:undo_indent = "setl inde< indk< lisp<"
+
 " Only define the function once.
 if exists("*GetPoVRayIndent")
   finish
diff --git a/runtime/indent/prolog.vim b/runtime/indent/prolog.vim
index ac03c28064..0c4fd541f9 100644
--- a/runtime/indent/prolog.vim
+++ b/runtime/indent/prolog.vim
@@ -4,6 +4,7 @@
 " 		Doug Kearns <dougkearns@gmail.com>
 "  Revised on:	2002.02.18. 23:34:05
 "  Last change by: Takuya Fujiwara, 2018 Sep 23
+"		2022 April: b:undo_indent added by Doug Kearns
 
 " TODO:
 "   checking with respect to syntax highlighting
@@ -21,6 +22,8 @@ setlocal indentexpr=GetPrologIndent()
 setlocal indentkeys-=:,0#
 setlocal indentkeys+=0%,-,0;,>,0)
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 "if exists("*GetPrologIndent")
 "    finish
diff --git a/runtime/indent/systemd.vim b/runtime/indent/qb64.vim
index a05a87bb1c..09f815c43d 100644
--- a/runtime/indent/systemd.vim
+++ b/runtime/indent/qb64.vim
@@ -1,10 +1,11 @@
 " Vim indent file
-" Language:  systemd.unit(5)
+" Language:	QB64
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2022 Jan 24
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
   finish
 endif
 
-" Looks a lot like dosini files.
-runtime! indent/dosini.vim
+runtime! indent/vb.vim
diff --git a/runtime/indent/query.lua b/runtime/indent/query.lua
new file mode 100644
index 0000000000..c86948e95e
--- /dev/null
+++ b/runtime/indent/query.lua
@@ -0,0 +1,6 @@
+-- Neovim indent file
+-- Language:	Tree-sitter query
+-- Last Change:	2022 Mar 29
+
+-- it's a lisp!
+vim.cmd([[ runtime! indent/lisp.vim ]])
diff --git a/runtime/indent/ruby.vim b/runtime/indent/ruby.vim
index 559d8652a6..6ce8529fd1 100644
--- a/runtime/indent/ruby.vim
+++ b/runtime/indent/ruby.vim
@@ -4,7 +4,7 @@
 " Previous Maintainer:	Nikolai Weibull <now at bitwi.se>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:		2021 Feb 03
+" Last Change:		2022 Mar 22
 
 " 0. Initialization {{{1
 " =================
@@ -40,9 +40,11 @@ setlocal nosmartindent
 " Now, set up our indentation expression and keys that trigger it.
 setlocal indentexpr=GetRubyIndent(v:lnum)
 setlocal indentkeys=0{,0},0),0],!^F,o,O,e,:,.
-setlocal indentkeys+==end,=else,=elsif,=when,=ensure,=rescue,==begin,==end
+setlocal indentkeys+==end,=else,=elsif,=when,=in\ ,=ensure,=rescue,==begin,==end
 setlocal indentkeys+==private,=protected,=public
 
+let b:undo_indent = "setlocal indentexpr< indentkeys< smartindent<"
+
 " Only define the function once.
 if exists("*GetRubyIndent")
   finish
@@ -85,14 +87,17 @@ let s:skip_expr =
 " Regex used for words that, at the start of a line, add a level of indent.
 let s:ruby_indent_keywords =
       \ '^\s*\zs\<\%(module\|class\|if\|for' .
-      \   '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure\|rescue' .
+      \   '\|while\|until\|else\|elsif\|case\|when\|in\|unless\|begin\|ensure\|rescue' .
       \   '\|\%(\K\k*[!?]\?\s\+\)\=def\):\@!\>' .
       \ '\|\%([=,*/%+-]\|<<\|>>\|:\s\)\s*\zs' .
       \    '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>'
 
+" Def without an end clause: def method_call(...) = <expression>
+let s:ruby_endless_def = '\<def\s\+\k\+[!?]\=\%((.*)\|\s\)\s*='
+
 " Regex used for words that, at the start of a line, remove a level of indent.
 let s:ruby_deindent_keywords =
-      \ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|end\):\@!\>'
+      \ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|in\|end\):\@!\>'
 
 " Regex that defines the start-match for the 'end' keyword.
 "let s:end_start_regex = '\%(^\|[^.]\)\<\%(module\|class\|def\|if\|for\|while\|until\|case\|unless\|begin\|do\)\>'
@@ -104,15 +109,31 @@ let s:end_start_regex =
       \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>'
 
 " Regex that defines the middle-match for the 'end' keyword.
-let s:end_middle_regex = '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue:\@!\>\|when\|elsif\):\@!\>'
+let s:end_middle_regex = '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue:\@!\>\|when\|\%(\%(^\|;\)\s*\)\@<=\<in\|elsif\):\@!\>'
 
 " Regex that defines the end-match for the 'end' keyword.
 let s:end_end_regex = '\%(^\|[^.:@$]\)\@<=\<end:\@!\>'
 
-" Expression used for searchpair() call for finding match for 'end' keyword.
-let s:end_skip_expr = s:skip_expr .
-      \ ' || (expand("<cword>") == "do"' .
-      \ ' && getline(".") =~ "^\\s*\\<\\(while\\|until\\|for\\):\\@!\\>")'
+" Expression used for searchpair() call for finding a match for an 'end' keyword.
+function! s:EndSkipExpr()
+  if eval(s:skip_expr)
+    return 1
+  elseif expand('<cword>') == 'do'
+        \ && getline(".") =~ '^\s*\<\(while\|until\|for\):\@!\>'
+    return 1
+  elseif getline('.') =~ s:ruby_endless_def
+    return 1
+  elseif getline('.') =~ '\<def\s\+\k\+[!?]\=([^)]*$'
+    " Then it's a `def method(` with a possible `) =` later
+    call search('\<def\s\+\k\+\zs(', 'W', line('.'))
+    normal! %
+    return getline('.') =~ ')\s*='
+  else
+    return 0
+  endif
+endfunction
+
+let s:end_skip_expr = function('s:EndSkipExpr')
 
 " Regex that defines continuation lines, not including (, {, or [.
 let s:non_bracket_continuation_regex =
@@ -572,6 +593,11 @@ function! s:AfterUnbalancedBracket(pline_info) abort
       call cursor(info.plnum, closing.pos + 1)
       normal! %
 
+      if strpart(info.pline, closing.pos) =~ '^)\s*='
+        " special case: the closing `) =` of an endless def
+        return indent(s:GetMSL(line('.')))
+      endif
+
       if s:Match(line('.'), s:ruby_indent_keywords)
         return indent('.') + info.sw
       else
@@ -610,7 +636,7 @@ function! s:AfterIndentKeyword(pline_info) abort
   let info = a:pline_info
   let col = s:Match(info.plnum, s:ruby_indent_keywords)
 
-  if col > 0
+  if col > 0 && s:Match(info.plnum, s:ruby_endless_def) <= 0
     call cursor(info.plnum, col)
     let ind = virtcol('.') - 1 + info.sw
     " TODO: make this better (we need to count them) (or, if a searchpair
@@ -657,7 +683,7 @@ function! s:IndentingKeywordInMSL(msl_info) abort
   " TODO: this does not take into account contrived things such as
   " module Foo; class Bar; end
   let col = s:Match(info.plnum_msl, s:ruby_indent_keywords)
-  if col > 0
+  if col > 0 && s:Match(info.plnum_msl, s:ruby_endless_def) <= 0
     let ind = indent(info.plnum_msl) + info.sw
     if s:Match(info.plnum_msl, s:end_end_regex)
       let ind = ind - info.sw
diff --git a/runtime/indent/sas.vim b/runtime/indent/sas.vim
index 9cc9e025c4..bbbbbf02eb 100644
--- a/runtime/indent/sas.vim
+++ b/runtime/indent/sas.vim
@@ -2,7 +2,7 @@
 " Language:     SAS
 " Maintainer:   Zhen-Huan Hu <wildkeny@gmail.com>
 " Version:      3.0.3
-" Last Change:  Jun 26, 2018
+" Last Change:  2022 Apr 06
 
 if exists("b:did_indent")
   finish
@@ -12,6 +12,8 @@ let b:did_indent = 1
 setlocal indentexpr=GetSASIndent()
 setlocal indentkeys+=;,=~data,=~proc,=~macro
 
+let b:undo_indent = "setl inde< indk<"
+
 if exists("*GetSASIndent")
   finish
 endif
diff --git a/runtime/indent/sass.vim b/runtime/indent/sass.vim
index d6dbf3a8bb..8c0ecd0746 100644
--- a/runtime/indent/sass.vim
+++ b/runtime/indent/sass.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	Sass
 " Maintainer:	Tim Pope <vimNOSPAM@tpope.org>
-" Last Change:	2017 Jun 13
+" Last Change:	2022 Mar 15
 
 if exists("b:did_indent")
   finish
@@ -12,6 +12,8 @@ setlocal autoindent sw=2 et
 setlocal indentexpr=GetSassIndent()
 setlocal indentkeys=o,O,*<Return>,<:>,!^F
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 " Only define the function once.
 if exists("*GetSassIndent")
   finish
diff --git a/runtime/indent/sml.vim b/runtime/indent/sml.vim
index e760a8e350..a0b0c3e911 100644
--- a/runtime/indent/sml.vim
+++ b/runtime/indent/sml.vim
@@ -7,10 +7,11 @@
 "               Mike Leary          <leary@nwlink.com>
 "               Markus Mottl        <markus@oefai.at>
 " OCaml URL:    http://www.oefai.at/~markus/vim/indent/ocaml.vim
-" Last Change:  2003 Jan 04	- Adapted to SML
+" Last Change:  2022 Apr 06
 " 				2002 Nov 06 - Some fixes (JY)
 "               2002 Oct 28 - Fixed bug with indentation of ']' (MM)
 "               2002 Oct 22 - Major rewrite (JY)
+"		2022 April: b:undo_indent added by Doug Kearns
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -26,6 +27,8 @@ setlocal nosmartindent
 setlocal textwidth=80
 setlocal shiftwidth=2
 
+let b:undo_indent = "setl et< inde< indk< lisp< si< sw< tw<"
+
 " Comment formatting
 if (has("comments"))
   set comments=sr:(*,mb:*,ex:*)
diff --git a/runtime/indent/systemverilog.vim b/runtime/indent/systemverilog.vim
index 16fb4515c5..f6114dc1fd 100644
--- a/runtime/indent/systemverilog.vim
+++ b/runtime/indent/systemverilog.vim
@@ -2,6 +2,7 @@
 " Language:    SystemVerilog
 " Maintainer:  kocha <kocha.lsifrontend@gmail.com>
 " Last Change: 05-Feb-2017 by Bilal Wasim
+"		2022 April: b:undo_indent added by Doug Kearns
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -16,6 +17,8 @@ setlocal indentkeys+==endclass,=endpackage,=endsequence,=endclocking
 setlocal indentkeys+==endinterface,=endgroup,=endprogram,=endproperty,=endchecker
 setlocal indentkeys+==`else,=`endif
 
+let b:undo_indent = "setl inde< indk<"
+
 " Only define the function once.
 if exists("*SystemVerilogIndent")
   finish
diff --git a/runtime/indent/testdir/html.in b/runtime/indent/testdir/html.in
index 1acf8c0402..b62c67ddb2 100644
--- a/runtime/indent/testdir/html.in
+++ b/runtime/indent/testdir/html.in
@@ -1,4 +1,4 @@
-" vim: set ft=html sw=4 :
+" vim: set ft=html sw=4 ts=8 :
 
 
 " START_INDENT
@@ -41,6 +41,11 @@ dd text
 dt text
 </dt>
 </dl>
+<div
+class="test"
+style="color: yellow">
+text
+</div>
 
     </body>
 </html>
@@ -50,6 +55,7 @@ dt text
 % START_INDENT
 % INDENT_EXE let g:html_indent_style1 = "inc"
 % INDENT_EXE let g:html_indent_script1 = "zero"
+% INDENT_EXE let g:html_indent_attribute = 1
 % INDENT_EXE call HtmlIndent_CheckUserSettings()
 <html>
     <body>
@@ -61,6 +67,11 @@ div#d2 { color: green; }
 	var v1 = "v1";
 var v2 = "v2";
     </script>
+<div
+class="test"
+style="color: yellow">
+text
+</div>
 </body>
 </html>
 % END_INDENT
diff --git a/runtime/indent/testdir/html.ok b/runtime/indent/testdir/html.ok
index c0dfc9dc72..938e965d8c 100644
--- a/runtime/indent/testdir/html.ok
+++ b/runtime/indent/testdir/html.ok
@@ -1,4 +1,4 @@
-" vim: set ft=html sw=4 :
+" vim: set ft=html sw=4 ts=8 :
 
 
 " START_INDENT
@@ -41,6 +41,11 @@ div#d2 { color: green; }
 		dt text
 	    </dt>
 	</dl>
+	<div
+		class="test"
+		style="color: yellow">
+	    text
+	</div>
 
     </body>
 </html>
@@ -50,6 +55,7 @@ div#d2 { color: green; }
 % START_INDENT
 % INDENT_EXE let g:html_indent_style1 = "inc"
 % INDENT_EXE let g:html_indent_script1 = "zero"
+% INDENT_EXE let g:html_indent_attribute = 1
 % INDENT_EXE call HtmlIndent_CheckUserSettings()
 <html>
     <body>
@@ -61,6 +67,11 @@ div#d2 { color: green; }
 var v1 = "v1";
 var v2 = "v2";
 	</script>
+	<div
+	    class="test"
+	    style="color: yellow">
+	    text
+	</div>
     </body>
 </html>
 % END_INDENT
diff --git a/runtime/indent/testdir/krl.in b/runtime/indent/testdir/krl.in
new file mode 100644
index 0000000000..ec90feb08b
--- /dev/null
+++ b/runtime/indent/testdir/krl.in
@@ -0,0 +1,148 @@
+; vim: set ft=krl :
+
+; START_INDENT
+
+def One()
+int i
+If i==1 then
+While i>=1
+For i=1 to 5 step 2
+Loop
+i = i+1
+EndLoop
+EndFor
+EndWhile
+Else
+Repeat
+Switch i
+Case 1
+Skip 123
+i = i+1
+EndSkip 123
+Spline with $acc=100, $vel.cp=3
+slin {x 100}
+scirc {x 110, y 110}, {x 120, y 90}
+slin {x 200} c_dis
+Time_Block Start
+slin {x 300} c_dis
+Time_Block Part = 22.2
+slin {y 400} c_dis
+Time_Block Part = 33.3
+Time_Block End = 10
+slin {y 200} c_dis
+Const_Vel Start +100 OnStart
+slin {y 300} c_dis
+slin {x 100}
+Const_Vel End -5.5
+slin {y 200} c_dis
+EndSpline
+Case 2,3
+PTP_Spline with $acc=100, $vel.ptp=100
+sptp {a1 0} c_ptp
+sptp {a1 90}
+EndSpline c_spl
+Default
+i = i+1
+EndSwitch
+Continue
+Until False
+EndIf
+end
+
+DEF Two()
+int i
+END
+
+global def Three()
+int i
+end
+
+GLOBAL DEF Four()
+int i
+END
+
+Global Def Five()
+int i
+End
+
+deffct bool fOne()
+int i
+endfct
+
+DEFFCT bool fTwo()
+int i
+ENDFCT
+
+global deffct bool fThree()
+int i
+endfct
+
+GLOBAL DEFFCT bool fFour()
+int i
+ENDFCT
+
+Global DefFct bool fFive()
+int i
+EndFct
+
+DefDat datfile()
+global int i=1
+; don't indent column 1 comments unless g:krlCommentIndent is set
+;  global int o=2
+EndDat
+
+; END_INDENT
+
+; START_INDENT
+; INDENT_EXE let g:krlSpaceIndent = 0
+; INDENT_EXE set shiftwidth=4
+
+def bla()
+int i
+end
+
+; END_INDENT
+
+; START_INDENT
+; INDENT_EXE let g:krlCommentIndent = 1
+def bla()
+; indent this first column comment because of g:krlCommentIndent=1
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_EXE let g:krlIndentBetweenDef = 0
+def bla()
+int i ; don't indent this line because of g:krlIndentBetweenDef=0
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_AT  this-line
+def Some()
+int f
+if true then
+f = 1 ; this-line
+endif
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_NEXT  next-line
+def Some()
+  int i
+     ; next-line
+i = 1 ; should get indent of line 'int i' above
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_PREV  prev-line
+def Some()
+int f
+if true then
+f = 1
+; prev-line
+endif
+end
+; END_INDENT
diff --git a/runtime/indent/testdir/krl.ok b/runtime/indent/testdir/krl.ok
new file mode 100644
index 0000000000..34dc0f57b1
--- /dev/null
+++ b/runtime/indent/testdir/krl.ok
@@ -0,0 +1,148 @@
+; vim: set ft=krl :
+
+; START_INDENT
+
+def One()
+  int i
+  If i==1 then
+    While i>=1
+      For i=1 to 5 step 2
+        Loop
+          i = i+1
+        EndLoop
+      EndFor
+    EndWhile
+  Else
+    Repeat
+      Switch i
+      Case 1
+        Skip 123
+          i = i+1
+        EndSkip 123
+        Spline with $acc=100, $vel.cp=3
+          slin {x 100}
+          scirc {x 110, y 110}, {x 120, y 90}
+          slin {x 200} c_dis
+          Time_Block Start
+            slin {x 300} c_dis
+          Time_Block Part = 22.2
+            slin {y 400} c_dis
+          Time_Block Part = 33.3
+          Time_Block End = 10
+          slin {y 200} c_dis
+          Const_Vel Start +100 OnStart
+            slin {y 300} c_dis
+            slin {x 100}
+          Const_Vel End -5.5
+          slin {y 200} c_dis
+        EndSpline
+      Case 2,3
+        PTP_Spline with $acc=100, $vel.ptp=100
+          sptp {a1 0} c_ptp
+          sptp {a1 90}
+        EndSpline c_spl
+      Default
+        i = i+1
+      EndSwitch
+    Continue
+    Until False
+  EndIf
+end
+
+DEF Two()
+  int i
+END
+
+global def Three()
+  int i
+end
+
+GLOBAL DEF Four()
+  int i
+END
+
+Global Def Five()
+  int i
+End
+
+deffct bool fOne()
+  int i
+endfct
+
+DEFFCT bool fTwo()
+  int i
+ENDFCT
+
+global deffct bool fThree()
+  int i
+endfct
+
+GLOBAL DEFFCT bool fFour()
+  int i
+ENDFCT
+
+Global DefFct bool fFive()
+  int i
+EndFct
+
+DefDat datfile()
+  global int i=1
+; don't indent column 1 comments unless g:krlCommentIndent is set
+;  global int o=2
+EndDat
+
+; END_INDENT
+
+; START_INDENT
+; INDENT_EXE let g:krlSpaceIndent = 0
+; INDENT_EXE set shiftwidth=4
+
+def bla()
+    int i
+end
+
+; END_INDENT
+
+; START_INDENT
+; INDENT_EXE let g:krlCommentIndent = 1
+def bla()
+    ; indent this first column comment because of g:krlCommentIndent=1
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_EXE let g:krlIndentBetweenDef = 0
+def bla()
+int i ; don't indent this line because of g:krlIndentBetweenDef=0
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_AT  this-line
+def Some()
+int f
+if true then
+    f = 1 ; this-line
+endif
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_NEXT  next-line
+def Some()
+  int i
+     ; next-line
+  i = 1 ; should get indent of line 'int i' above
+end
+; END_INDENT
+
+; START_INDENT
+; INDENT_PREV  prev-line
+def Some()
+int f
+if true then
+    f = 1
+; prev-line
+endif
+end
+; END_INDENT
diff --git a/runtime/indent/testdir/vim.in b/runtime/indent/testdir/vim.in
index 699e4c243d..873045bc2c 100644
--- a/runtime/indent/testdir/vim.in
+++ b/runtime/indent/testdir/vim.in
@@ -30,6 +30,12 @@ for x in [
 eval 0
 endfor
 
+let t = [
+\ {
+\ 'k': 'val',
+\ },
+\  ]
+
 " END_INDENT
 
 " START_INDENT
diff --git a/runtime/indent/testdir/vim.ok b/runtime/indent/testdir/vim.ok
index f597d97e80..8e70abe619 100644
--- a/runtime/indent/testdir/vim.ok
+++ b/runtime/indent/testdir/vim.ok
@@ -30,6 +30,12 @@ for x in [
     eval 0
 endfor
 
+let t = [
+	    \ {
+	    \ 'k': 'val',
+	    \ },
+	    \  ]
+
 " END_INDENT
 
 " START_INDENT
diff --git a/runtime/indent/testdir/yaml.in b/runtime/indent/testdir/yaml.in
index 8515e1752c..bf99668da2 100644
--- a/runtime/indent/testdir/yaml.in
+++ b/runtime/indent/testdir/yaml.in
@@ -14,6 +14,7 @@ map: val
 # END_INDENT
 
 # START_INDENT
-map: multiline
-value
+map: |
+line1
+line2
 # END_INDENT
diff --git a/runtime/indent/testdir/yaml.ok b/runtime/indent/testdir/yaml.ok
index 5ca2871fc9..8b38633e71 100644
--- a/runtime/indent/testdir/yaml.ok
+++ b/runtime/indent/testdir/yaml.ok
@@ -14,6 +14,7 @@ map: val
 # END_INDENT
 
 # START_INDENT
-map: multiline
-  value
+map: |
+  line1
+  line2
 # END_INDENT
diff --git a/runtime/indent/tf.vim b/runtime/indent/tf.vim
index a980538506..bb40bf6f01 100644
--- a/runtime/indent/tf.vim
+++ b/runtime/indent/tf.vim
@@ -2,7 +2,7 @@
 " Language:     tf (TinyFugue)
 " Maintainer:   Christian J. Robinson <heptite@gmail.com>
 " URL:          http://www.vim.org/scripts/script.php?script_id=174
-" Last Change:  2017 Feb 25 
+" Last Change:  2022 Apr 25
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -14,6 +14,8 @@ setlocal indentexpr=GetTFIndent()
 setlocal indentkeys-=0{,0} indentkeys-=0# indentkeys-=:
 setlocal indentkeys+==/endif,=/then,=/else,=/done,0;
 
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
 " Only define the function once:
 if exists("*GetTFIndent")
   finish
diff --git a/runtime/indent/tilde.vim b/runtime/indent/tilde.vim
index e722a0994c..8658035f72 100644
--- a/runtime/indent/tilde.vim
+++ b/runtime/indent/tilde.vim
@@ -1,7 +1,8 @@
 "Description: Indent scheme for the tilde weblanguage
-"Author: Tobias Rundström <tobi@tobi.nu>
+"Author: Tobias Rundström <tobi@tobi.nu> (Invalid email address)
 "URL: http://tilde.tildesoftware.net
 "Last Change: May  8 09:15:09 CEST 2002
+"	      2022 April: b:undo_indent added by Doug Kearns
 
 if exists ("b:did_indent")
 	finish
@@ -13,6 +14,8 @@ setlocal autoindent
 setlocal indentexpr=GetTildeIndent(v:lnum)
 setlocal indentkeys=o,O,)
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 if exists("*GetTildeIndent")
 	finish
 endif
diff --git a/runtime/indent/treetop.vim b/runtime/indent/treetop.vim
index 42ec1c8ad9..6c39c69687 100644
--- a/runtime/indent/treetop.vim
+++ b/runtime/indent/treetop.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             Treetop
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2011-03-14
+" Language:		Treetop
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@ setlocal indentexpr=GetTreetopIndent()
 setlocal indentkeys=0{,0},!^F,o,O,=end
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetTreetopIndent")
   finish
 endif
diff --git a/runtime/indent/vim.vim b/runtime/indent/vim.vim
index 7c03ff2873..8076b2df07 100644
--- a/runtime/indent/vim.vim
+++ b/runtime/indent/vim.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	Vim script
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2021 Nov 27
+" Last Change:	2022 Jun 24
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -10,7 +10,7 @@ endif
 let b:did_indent = 1
 
 setlocal indentexpr=GetVimIndent()
-setlocal indentkeys+==end,=},=else,=cat,=finall,=END,0\\,0=\"\\\ 
+setlocal indentkeys+==endif,=enddef,=endfu,=endfor,=endwh,=endtry,=},=else,=cat,=finall,=END,0\\,0=\"\\\ 
 setlocal indentkeys-=0#
 setlocal indentkeys-=:
 
@@ -36,6 +36,14 @@ endfunc
 let s:lineContPat = '^\s*\(\\\|"\\ \)'
 
 function GetVimIndentIntern()
+  " If the current line has line continuation and the previous one too, use
+  " the same indent.  This does not skip empty lines.
+  let cur_text = getline(v:lnum)
+  let cur_has_linecont = cur_text =~ s:lineContPat
+  if cur_has_linecont && v:lnum > 1 && getline(v:lnum - 1) =~ s:lineContPat
+    return indent(v:lnum - 1)
+  endif
+
   " Find a non-blank line above the current line.
   let lnum = prevnonblank(v:lnum - 1)
 
@@ -44,8 +52,7 @@ function GetVimIndentIntern()
 
   " If the current line doesn't start with '\' or '"\ ' and below a line that
   " starts with '\' or '"\ ', use the indent of the line above it.
-  let cur_text = getline(v:lnum)
-  if cur_text !~ s:lineContPat
+  if !cur_has_linecont
     while lnum > 0 && getline(lnum) =~ s:lineContPat
       let lnum = lnum - 1
     endwhile
@@ -103,10 +110,11 @@ function GetVimIndentIntern()
     " A line starting with :au does not increment/decrement indent.
     " A { may start a block or a dict.  Assume that when a } follows it's a
     " terminated dict.
+    " ":function" starts a block but "function(" doesn't.
     if prev_text !~ '^\s*au\%[tocmd]' && prev_text !~ '^\s*{.*}'
-      let i = match(prev_text, '\(^\||\)\s*\(export\s\+\)\?\({\|\(if\|wh\%[ile]\|for\|try\|cat\%[ch]\|fina\|finall\%[y]\|fu\%[nction]\|def\|el\%[seif]\)\>\)')
+      let i = match(prev_text, '\(^\||\)\s*\(export\s\+\)\?\({\|\(if\|wh\%[ile]\|for\|try\|cat\%[ch]\|fina\|finall\%[y]\|def\|el\%[seif]\)\>\|fu\%[nction][! ]\)')
       if i >= 0
-	let ind += shiftwidth()
+        let ind += shiftwidth()
 	if strpart(prev_text, i, 1) == '|' && has('syntax_items')
 	      \ && synIDattr(synID(lnum, i, 1), "name") =~ '\(Comment\|String\|PatSep\)$'
 	  let ind -= shiftwidth()
@@ -170,10 +178,15 @@ function GetVimIndentIntern()
     let ind = ind + shiftwidth()
   endif
 
-  " Subtract a 'shiftwidth' on a :endif, :endwhile, :catch, :finally, :endtry,
-  " :endfun, :else and :augroup END.
-  if cur_text =~ '^\s*\(ene\@!\|cat\|finall\|el\|aug\%[roup]\s\+[eE][nN][dD]\)'
+  " Subtract a 'shiftwidth' on a :endif, :endwhile, :endfor, :catch, :finally,
+  " :endtry, :endfun, :enddef, :else and :augroup END.
+  " Although ":en" would be enough only match short command names as in
+  " 'indentkeys'.
+  if cur_text =~ '^\s*\(endif\|endwh\|endfor\|endtry\|endfu\|enddef\|cat\|finall\|else\|aug\%[roup]\s\+[eE][nN][dD]\)'
     let ind = ind - shiftwidth()
+    if ind < 0
+      let ind = 0
+    endif
   endif
 
   return ind
diff --git a/runtime/indent/xf86conf.vim b/runtime/indent/xf86conf.vim
index 5a8bc0fec1..834eb00b25 100644
--- a/runtime/indent/xf86conf.vim
+++ b/runtime/indent/xf86conf.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             XFree86 Configuration File
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		XFree86 Configuration File
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@ setlocal indentexpr=GetXF86ConfIndent()
 setlocal indentkeys=!^F,o,O,=End
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetXF86ConfIndent")
   finish
 endif
diff --git a/runtime/indent/xinetd.vim b/runtime/indent/xinetd.vim
index 977ee3d33b..21000b7bc4 100644
--- a/runtime/indent/xinetd.vim
+++ b/runtime/indent/xinetd.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             xinetd.conf(5) configuration file
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		xinetd.conf(5) configuration file
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 if exists("b:did_indent")
   finish
@@ -12,6 +13,8 @@ setlocal indentexpr=GetXinetdIndent()
 setlocal indentkeys=0{,0},!^F,o,O
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 if exists("*GetXinetdIndent")
   finish
 endif
diff --git a/runtime/indent/yacc.vim b/runtime/indent/yacc.vim
index 01ad4fc56d..253ccc5371 100644
--- a/runtime/indent/yacc.vim
+++ b/runtime/indent/yacc.vim
@@ -1,7 +1,8 @@
 " Vim indent file
-" Language:             YACC input file
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2006-12-20
+" Language:		YACC input file
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Last Change:		2022 April 25
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -14,6 +15,8 @@ setlocal indentexpr=GetYaccIndent()
 setlocal indentkeys=!^F,o,O
 setlocal nosmartindent
 
+let b:undo_indent = "setl inde< indk< si<"
+
 " Only define the function once.
 if exists("*GetYaccIndent")
   finish
diff --git a/runtime/indent/yaml.vim b/runtime/indent/yaml.vim
index ed57e68d8b..d732c37c05 100644
--- a/runtime/indent/yaml.vim
+++ b/runtime/indent/yaml.vim
@@ -2,7 +2,7 @@
 " Language:	YAML
 " Maintainer:	Nikolai Pavlov <zyx.vim@gmail.com>
 " Last Update:	Lukas Reineke
-" Last Change:	2021 Aug 13
+" Last Change:	2022 Jun 17
 
 " Only load this indent file when no other was loaded.
 if exists('b:did_indent')
@@ -44,30 +44,30 @@ function s:FindPrevLEIndentedLineMatchingRegex(lnum, regex)
     return plilnum
 endfunction
 
-let s:mapkeyregex='\v^\s*\#@!\S@=%(\''%([^'']|\''\'')*\'''.
-                \                 '|\"%([^"\\]|\\.)*\"'.
+let s:mapkeyregex = '\v^\s*\#@!\S@=%(\''%([^'']|\''\'')*\''' ..
+                \                 '|\"%([^"\\]|\\.)*\"' ..
                 \                 '|%(%(\:\ )@!.)*)\:%(\ |$)'
-let s:liststartregex='\v^\s*%(\-%(\ |$))'
+let s:liststartregex = '\v^\s*%(\-%(\ |$))'
 
 let s:c_ns_anchor_char = '\v%([\n\r\uFEFF \t,[\]{}]@!\p)'
-let s:c_ns_anchor_name = s:c_ns_anchor_char.'+'
-let s:c_ns_anchor_property =  '\v\&'.s:c_ns_anchor_name
+let s:c_ns_anchor_name = s:c_ns_anchor_char .. '+'
+let s:c_ns_anchor_property =  '\v\&' .. s:c_ns_anchor_name
 
 let s:ns_word_char = '\v[[:alnum:]_\-]'
-let s:ns_tag_char  = '\v%('.s:ns_word_char.'|[#/;?:@&=+$.~*''()])'
-let s:c_named_tag_handle     = '\v\!'.s:ns_word_char.'+\!'
+let s:ns_tag_char  = '\v%(%\x\x|' .. s:ns_word_char .. '|[#/;?:@&=+$.~*''()])'
+let s:c_named_tag_handle     = '\v\!' .. s:ns_word_char .. '+\!'
 let s:c_secondary_tag_handle = '\v\!\!'
 let s:c_primary_tag_handle   = '\v\!'
-let s:c_tag_handle = '\v%('.s:c_named_tag_handle.
-            \            '|'.s:c_secondary_tag_handle.
-            \            '|'.s:c_primary_tag_handle.')'
-let s:c_ns_shorthand_tag = '\v'.s:c_tag_handle . s:ns_tag_char.'+'
+let s:c_tag_handle = '\v%(' .. s:c_named_tag_handle.
+            \            '|' .. s:c_secondary_tag_handle.
+            \            '|' .. s:c_primary_tag_handle .. ')'
+let s:c_ns_shorthand_tag = '\v' .. s:c_tag_handle .. s:ns_tag_char .. '+'
 let s:c_non_specific_tag = '\v\!'
-let s:ns_uri_char  = '\v%('.s:ns_word_char.'\v|[#/;?:@&=+$,.!~*''()[\]])'
-let s:c_verbatim_tag = '\v\!\<'.s:ns_uri_char.'+\>'
-let s:c_ns_tag_property = '\v'.s:c_verbatim_tag.
-            \               '\v|'.s:c_ns_shorthand_tag.
-            \               '\v|'.s:c_non_specific_tag
+let s:ns_uri_char  = '\v%(%\x\x|' .. s:ns_word_char .. '\v|[#/;?:@&=+$,.!~*''()[\]])'
+let s:c_verbatim_tag = '\v\!\<' .. s:ns_uri_char.. '+\>'
+let s:c_ns_tag_property = '\v' .. s:c_verbatim_tag.
+            \               '\v|' .. s:c_ns_shorthand_tag.
+            \               '\v|' .. s:c_non_specific_tag
 
 let s:block_scalar_header = '\v[|>]%([+-]?[1-9]|[1-9]?[+-])?'
 
@@ -142,9 +142,9 @@ function GetYAMLIndent(lnum)
         " - List with
         "   multiline scalar
         return previndent+2
-    elseif prevline =~# s:mapkeyregex . '\v\s*%(%('.s:c_ns_tag_property.
-                \                              '\v|'.s:c_ns_anchor_property.
-                \                              '\v|'.s:block_scalar_header.
+    elseif prevline =~# s:mapkeyregex .. '\v\s*%(%(' .. s:c_ns_tag_property ..
+                \                              '\v|' .. s:c_ns_anchor_property ..
+                \                              '\v|' .. s:block_scalar_header ..
                 \                             '\v)%(\s+|\s*%(\#.*)?$))*'
         " Mapping with: value
         "     that is multiline scalar