diff --git a/runtime/ftplugin/erlang.vim b/runtime/ftplugin/erlang.vim
index ece11d7..c775247 100644
--- a/runtime/ftplugin/erlang.vim
+++ b/runtime/ftplugin/erlang.vim
@@ -1,87 +1,83 @@
 " Vim ftplugin file
-" Language:     Erlang
+" Language:     Erlang (http://www.erlang.org)
+" Maintainer:   Csaba Hoch <csaba.hoch@gmail.com>
 " Author:       Oscar Hellström <oscar@oscarh.net>
 " Contributors: Ricardo Catalinas Jiménez <jimenezrick@gmail.com>
 "               Eduardo Lopez (http://github.com/tapichu)
+"               Arvid Bjurklint (http://github.com/slarwise)
+" Last Update:  2021-Jan-08
 " License:      Vim license
-" Version:      2012/01/25
+" URL:          https://github.com/vim-erlang/vim-erlang-runtime
 
 if exists('b:did_ftplugin')
-	finish
-else
-	let b:did_ftplugin = 1
+  finish
 endif
-
-if exists('s:did_function_definitions')
-	call s:SetErlangOptions()
-	finish
-else
-	let s:did_function_definitions = 1
-endif
+let b:did_ftplugin = 1
 
 let s:cpo_save = &cpo
 set cpo&vim
 
-if !exists('g:erlang_keywordprg')
-	let g:erlang_keywordprg = 'erl -man'
+let &l:keywordprg = get(g:, 'erlang_keywordprg', 'erl -man')
+
+if get(g:, 'erlang_folding', 0)
+  setlocal foldmethod=expr
+  setlocal foldexpr=GetErlangFold(v:lnum)
+  setlocal foldtext=ErlangFoldText()
 endif
 
-if !exists('g:erlang_folding')
-	let g:erlang_folding = 0
-endif
+setlocal comments=:%%%,:%%,:%
+setlocal commentstring=%%s
+
+setlocal formatoptions+=ro
+
+setlocal suffixesadd=.erl,.hrl
+
+let &l:include = '^\s*-\%(include\|include_lib\)\s*("\zs\f*\ze")'
+let &l:define  = '^\s*-\%(define\|record\|type\|opaque\)'
 
 let s:erlang_fun_begin = '^\a\w*(.*$'
 let s:erlang_fun_end   = '^[^%]*\.\s*\(%.*\)\?$'
 
-function s:SetErlangOptions()
-	if g:erlang_folding
-		setlocal foldmethod=expr
-		setlocal foldexpr=GetErlangFold(v:lnum)
-		setlocal foldtext=ErlangFoldText()
-	endif
+if !exists('*GetErlangFold')
+  function GetErlangFold(lnum)
+    let lnum = a:lnum
+    let line = getline(lnum)
 
-	setlocal comments=:%%%,:%%,:%
-	setlocal commentstring=%%s
+    if line =~ s:erlang_fun_end
+      return '<1'
+    endif
 
-	setlocal formatoptions+=ro
-	let &l:keywordprg = g:erlang_keywordprg
-endfunction
+    if line =~ s:erlang_fun_begin && foldlevel(lnum - 1) == 1
+      return '1'
+    endif
 
-function GetErlangFold(lnum)
-	let lnum = a:lnum
-	let line = getline(lnum)
+    if line =~ s:erlang_fun_begin
+      return '>1'
+    endif
 
-	if line =~ s:erlang_fun_end
-		return '<1'
-	endif
+    return '='
+  endfunction
+endif
 
-	if line =~ s:erlang_fun_begin && foldlevel(lnum - 1) == 1
-		return '1'
-	endif
+if !exists('*ErlangFoldText')
+  function ErlangFoldText()
+    let line    = getline(v:foldstart)
+    let foldlen = v:foldend - v:foldstart + 1
+    let lines   = ' ' . foldlen . ' lines: ' . substitute(line, "[\ \t]*", '', '')
+    if foldlen < 10
+      let lines = ' ' . lines
+    endif
+    let retval = '+' . v:folddashes . lines
 
-	if line =~ s:erlang_fun_begin
-		return '>1'
-	endif
+    return retval
+  endfunction
+endif
 
-	return '='
-endfunction
-
-function ErlangFoldText()
-	let line    = getline(v:foldstart)
-	let foldlen = v:foldend - v:foldstart + 1
-	let lines   = ' ' . foldlen . ' lines: ' . substitute(line, "[\ \t]*", '', '')
-	if foldlen < 10
-		let lines = ' ' . lines
-	endif
-	let retval = '+' . v:folddashes . lines
-
-	return retval
-endfunction
-
-call s:SetErlangOptions()
-
-let b:undo_ftplugin = "setlocal foldmethod< foldexpr< foldtext<"
-	\ . " comments< commentstring< formatoptions<"
+let b:undo_ftplugin = "setlocal keywordprg< foldmethod< foldexpr< foldtext<"
+      \ . " comments< commentstring< formatoptions< suffixesadd< include<"
+      \ . " define<"
 
 let &cpo = s:cpo_save
 unlet s:cpo_save
+
+" vim: sw=2 et
diff --git a/runtime/ftplugin/fstab.vim b/runtime/ftplugin/fstab.vim
index 3e7af9f..9980532 100644
--- a/runtime/ftplugin/fstab.vim
+++ b/runtime/ftplugin/fstab.vim
@@ -2,7 +2,7 @@
 " Language: fstab file
 " Maintainer: Radu Dineiu <radu.dineiu@gmail.com>
 " URL: https://raw.github.com/rid9/vim-fstab/master/ftplugin/fstab.vim
-" Last Change: 2020 Dec 29
+" Last Change: 2021 Jan 02
 " Version: 1.0
 "
 " Credits:
@@ -16,4 +16,4 @@
 setlocal commentstring=#%s
 let b:undo_ftplugin = "setlocal commentstring<"
 
-" vim: ts=8 ft=vim
\ No newline at end of file
+" vim: ts=8 ft=vim
diff --git a/runtime/ftplugin/swift.vim b/runtime/ftplugin/swift.vim
index 55678f8..a86b782 100644
--- a/runtime/ftplugin/swift.vim
+++ b/runtime/ftplugin/swift.vim
@@ -6,7 +6,16 @@
 " See https://swift.org/LICENSE.txt for license information
 " See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 "
-" Vim maintainer: Emir SARI <bitigchi@me.com>
+" Vim maintainer: 	Emir SARI <bitigchi@me.com>
+" Last Change:		2021 Jan 08
+
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+    finish
+endif
+
+let b:did_ftplugin = 1
+let b:undo_ftplugin = "setlocal comments< expandtab< tabstop< shiftwidth< smartindent<"
 
 setlocal comments=s1:/*,mb:*,ex:*/,:///,://
 setlocal expandtab
diff --git a/runtime/ftplugin/vim.vim b/runtime/ftplugin/vim.vim
index b87e144..3307de5 100644
--- a/runtime/ftplugin/vim.vim
+++ b/runtime/ftplugin/vim.vim
@@ -1,7 +1,7 @@
 " Vim filetype plugin
 " Language:	Vim
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2020 Aug 14
+" Last Change:	2021 Jan 05
 
 " Only do this when not done yet for this buffer
 if exists("b:did_ftplugin")
@@ -48,18 +48,23 @@
 " Use :help to lookup the keyword under the cursor with K.
 setlocal keywordprg=:help
 
-" Set 'comments' to format dashed lists in comments
-" Avoid that #{} starts a comment.
-setlocal com=sO:\"\ -,mO:\"\ \ ,sO:#\ -,mO:#\ \ ,eO:##,:\",b:#
+if "\n" .. getline(1, 10)->join("\n") =~# '\n\s*vim9\%[script]\>'
+  " Set 'comments' to format dashed lists in comments
+  setlocal com=sO:#\ -,mO:#\ \ ,eO:##,:#
+  " Comments start with a double quote in a legacy script;
+  " with # in a Vim9 script
+  setlocal commentstring=\"%s
+else
+  setlocal com=sO:\"\ -,mO:\"\ \ ,:\"
+  setlocal commentstring=#%s
+endif
+
 
 " Format comments to be up to 78 characters long
 if &tw == 0
   setlocal tw=78
 endif
 
-" Comments start with a double quote; in Vim9 script # would also work
-setlocal commentstring=\"%s
-
 if !exists("no_plugin_maps") && !exists("no_vim_maps")
   let b:did_add_maps = 1