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autocmd.txt   Nvim


		  VIM REFERENCE MANUAL    by Bram Moolenaar


Automatic commands					autocmd autocommand

For a basic explanation, see section 40.3 in the user manual.

				      Type gO to see the table of contents.

==============================================================================
1. Introduction						autocmd-intro

You can specify commands to be executed automatically when reading or writing
a file, when entering or leaving a buffer or window, and when exiting Vim.
For example, you can create an autocommand to set the 'cindent' option for
files matching *.c.  You can also use autocommands to implement advanced
features, such as editing compressed files (see gzip-example).  The usual
place to put autocommands is in your vimrc file.

				E203 E204 E143 E855 E937 E952
WARNING: Using autocommands is very powerful, and may lead to unexpected side
effects.  Be careful not to destroy your text.
- It's a good idea to do some testing on an expendable copy of a file first.
  For example: If you use autocommands to decompress a file when starting to
  edit it, make sure that the autocommands for compressing when writing work
  correctly.
- Be prepared for an error halfway through (e.g., disk full).  Vim will mostly
  be able to undo the changes to the buffer, but you may have to clean up the
  changes to other files by hand (e.g., compress a file that has been
  decompressed).
- If the BufRead* events allow you to edit a compressed file, the FileRead*
  events should do the same (this makes recovery possible in some rare cases).
  It's a good idea to use the same autocommands for the File* and Buf* events
  when possible.

==============================================================================
2. Defining autocommands				autocmd-define

							:au :autocmd
:au[tocmd] [group] {event} {aupat} [++once] [++nested] {cmd}
			Add {cmd} to the list of commands that Vim will
			execute automatically on {event} for a file matching
			{aupat} autocmd-pattern.
			Note: A quote character is seen as argument to the
			:autocmd and won't start a comment.
			Nvim always adds {cmd} after existing autocommands so
			they execute in the order in which they were defined.
			See autocmd-nested for [++nested].
							autocmd-once
			If [++once] is supplied the command is executed once,
			then removed ("one shot").

The special pattern <buffer> or <buffer=N> defines a buffer-local autocommand.
See autocmd-buflocal.

Note: The ":autocmd" command can only be followed by another command when the
"|" appears where the pattern is expected.  This works: 
	:augroup mine | au! BufRead | augroup END
But this sees "augroup" as part of the defined command: 
	:augroup mine | au! BufRead * | augroup END
	:augroup mine | au BufRead * set tw=70 | augroup END
Instead you can put the group name into the command: 
	:au! mine BufRead *
	:au mine BufRead * set tw=70
Or use :execute: 
	:augroup mine | exe "au! BufRead *" | augroup END
	:augroup mine | exe "au BufRead * set tw=70" | augroup END

							autocmd-expand
Note that special characters (e.g., "%", "<cword>") in the ":autocmd"
arguments are not expanded when the autocommand is defined.  These will be
expanded when the Event is recognized, and the {cmd} is executed.  The only
exception is that "<sfile>" is expanded when the autocmd is defined.  Example:

	:au BufNewFile,BufRead *.html so <sfile>:h/html.vim

Here Vim expands <sfile> to the name of the file containing this line.

:autocmd adds to the list of autocommands regardless of whether they are
already present.  When your .vimrc file is sourced twice, the autocommands
will appear twice.  To avoid this, define your autocommands in a group, so
that you can easily clear them: 

	augroup vimrc
	  " Remove all vimrc autocommands
	  autocmd!
	  au BufNewFile,BufRead *.html so <sfile>:h/html.vim
	augroup END

If you don't want to remove all autocommands, you can instead use a variable
to ensure that Vim includes the autocommands only once: 

	:if !exists("autocommands_loaded")
	:  let autocommands_loaded = 1
	:  au ...
	:endif

When the [group] argument is not given, Vim uses the current group (as defined
with ":augroup"); otherwise, Vim uses the group defined with [group].  Note
that [group] must have been defined before.  You cannot define a new group
with ":au group ..."; use ":augroup" for that.

While testing autocommands, you might find the 'verbose' option to be useful: 
	:set verbose=9
This setting makes Vim echo the autocommands as it executes them.

When defining an autocommand in a script, it will be able to call functions
local to the script and use mappings local to the script.  When the event is
triggered and the command executed, it will run in the context of the script
it was defined in.  This matters if <SID> is used in a command.

When executing the commands, the message from one command overwrites a
previous message.  This is different from when executing the commands
manually.  Mostly the screen will not scroll up, thus there is no hit-enter
prompt.  When one command outputs two messages this can happen anyway.

==============================================================================
3. Removing autocommands			autocmd! autocmd-remove

:au[tocmd]! [group] {event} {aupat} [++once] [++nested] {cmd}
			Remove all autocommands associated with {event} and
			{aupat}, and add the command {cmd}.
			See autocmd-once for [++once].
			See autocmd-nested for [++nested].

:au[tocmd]! [group] {event} {aupat}
			Remove all autocommands associated with {event} and
			{aupat}.

:au[tocmd]! [group] * {aupat}
			Remove all autocommands associated with {aupat} for
			all events.

:au[tocmd]! [group] {event}
			Remove ALL autocommands for {event}.
			Warning: You should not do this without a group for
			BufRead and other common events, it can break
			plugins, syntax highlighting, etc.

:au[tocmd]! [group]	Remove ALL autocommands.
			Note: a quote will be seen as argument to the :autocmd
			and won't start a comment.
			Warning: You should normally not do this without a
			group, it breaks plugins, syntax highlighting, etc.

When the [group] argument is not given, Vim uses the current group (as defined
with ":augroup"); otherwise, Vim uses the group defined with [group].

==============================================================================
4. Listing autocommands					autocmd-list

:au[tocmd] [group] {event} {aupat}
			Show the autocommands associated with {event} and
			{aupat}.

:au[tocmd] [group] * {aupat}
			Show the autocommands associated with {aupat} for all
			events.

:au[tocmd] [group] {event}
			Show all autocommands for {event}.

:au[tocmd] [group]	Show all autocommands.

If you provide the [group] argument, Vim lists only the autocommands for
[group]; otherwise, Vim lists the autocommands for ALL groups.  Note that this
argument behavior differs from that for defining and removing autocommands.

In order to list buffer-local autocommands, use a pattern in the form <buffer>
or <buffer=N>.  See autocmd-buflocal.

							:autocmd-verbose
When 'verbose' is non-zero, listing an autocommand will also display where it
was last defined. Example: 

    :verbose autocmd BufEnter
    FileExplorer  BufEnter
	*	  call s:LocalBrowse(expand("<amatch>"))
	    Last set from /usr/share/vim/vim-7.0/plugin/NetrwPlugin.vim

See :verbose-cmd for more information.

==============================================================================
5. Events					autocmd-events E215 E216

You can specify a comma-separated list of event names.  No white space can be
used in this list.  The command applies to all the events in the list.

For READING FILES there are four kinds of events possible:
	BufNewFile			starting to edit a non-existent file
	BufReadPre	BufReadPost	starting to edit an existing file
	FilterReadPre	FilterReadPost	read the temp file with filter output
	FileReadPre	FileReadPost	any other file read
Vim uses only one of these four kinds when reading a file.  The "Pre" and
"Post" events are both triggered, before and after reading the file.

Note that the autocommands for the "*ReadPre" events and all the Filter events
are not allowed to change the current buffer (you will get an error message if
this happens).  This is to prevent the file to be read into the wrong buffer.

Note that the 'modified' flag is reset AFTER executing the BufReadPost
and BufNewFile autocommands.  But when the 'modified' option was set by the
autocommands, this doesn't happen.

You can use the 'eventignore' option to ignore a number of events or all
events.

							events {event}
Nvim recognizes the following events.  Names are case-insensitive.

							BufAdd
BufAdd				After adding a new buffer or existing unlisted
				buffer to the buffer list (except during
				startup, see VimEnter), or renaming a listed
				buffer.
				Before BufEnter.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
							BufDelete
BufDelete			Before deleting a buffer from the buffer list.
				The BufUnload may be called first (if the
				buffer was loaded).
				Also used just before a buffer in the buffer
				list is renamed.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
				Do not change to another buffer.
							BufEnter
BufEnter			After entering (visiting, switching-to) a new
				or existing buffer. Useful for setting
				filetype options.  Compare BufNew which
				does not trigger for existing buffers.
				After BufAdd.
				After BufReadPost.
							BufFilePost
BufFilePost			After changing the name of the current buffer
				with the ":file" or ":saveas" command.
							BufFilePre
BufFilePre			Before changing the name of the current buffer
				with the ":file" or ":saveas" command.
							BufHidden
BufHidden			Before a buffer becomes hidden: when there are
				no longer windows that show the buffer, but
				the buffer is not unloaded or deleted.

				Not used for ":qa" or ":q" when exiting Vim.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
							BufLeave
BufLeave			Before leaving to another buffer.  Also when
				leaving or closing the current window and the
				new current window is not for the same buffer.

				Not used for ":qa" or ":q" when exiting Vim.
							BufModifiedSet
BufModifiedSet			After the 'modified' value of a buffer has
				been changed.
							BufNew
BufNew				After creating a new buffer (except during
				startup, see VimEnter) or renaming an
				existing buffer. Unlike BufEnter, visiting
				(switching to) an existing buffer will not
				trigger this again.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
				See also BufAdd, BufNewFile.
							BufNewFile
BufNewFile			When starting to edit a file that doesn't
				exist.  Can be used to read in a skeleton
				file.
						BufRead BufReadPost
BufRead or BufReadPost		When starting to edit a new buffer, after
				reading the file into the buffer, before
				processing modelines.  See BufWinEnter to do
				something after processing modelines.
				Also triggered:
				- when writing an unnamed buffer in a way that
				  the buffer gets a name
				- after successfully recovering a file
				- for the "filetypedetect" group when
				  executing ":filetype detect"
				Not triggered:
				- for the `:read file` command
				- when the file doesn't exist
							BufReadCmd
BufReadCmd			Before starting to edit a new buffer.  Should
				read the file into the buffer. Cmd-event
						BufReadPre E200 E201
BufReadPre			When starting to edit a new buffer, before
				reading the file into the buffer.  Not used
				if the file doesn't exist.
							BufUnload
BufUnload			Before unloading a buffer, when the text in
				the buffer is going to be freed.
				After BufWritePost.
				Before BufDelete.
				Triggers for all loaded buffers when Vim is
				going to exit.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
				Do not switch buffers or windows!
				Not triggered when exiting and v:dying is 2 or
				more.
							BufWinEnter
BufWinEnter			After a buffer is displayed in a window.  This
				may be when the buffer is loaded (after
				processing modelines) or when a hidden buffer
				is displayed (and is no longer hidden).

				Not triggered for :split without arguments,
				since the buffer does not change, or :split
				with a file already open in a window.
				Triggered for ":split" with the name of the
				current buffer, since it reloads that buffer.
							BufWinLeave
BufWinLeave			Before a buffer is removed from a window.
				Not when it's still visible in another window.
				Also triggered when exiting.
				Before BufUnload, BufHidden.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
				Not triggered when exiting and v:dying is 2 or
				more.
							BufWipeout
BufWipeout			Before completely deleting a buffer.  The
				BufUnload and BufDelete events may be called
				first (if the buffer was loaded and was in the
				buffer list).  Also used just before a buffer
				is renamed (also when it's not in the buffer
				list).
				NOTE: Current buffer "%" is not the target
				buffer "<afile>", "<abuf>". <buffer=abuf>
				Do not change to another buffer.
						BufWrite BufWritePre
BufWrite or BufWritePre		Before writing the whole buffer to a file.
							BufWriteCmd
BufWriteCmd			Before writing the whole buffer to a file.
				Should do the writing of the file and reset
				'modified' if successful, unless '+' is in
				'cpo' and writing to another file cpo-+.
				The buffer contents should not be changed.
				When the command resets 'modified' the undo
				information is adjusted to mark older undo
				states as 'modified', like :write does.
				Cmd-event
							BufWritePost
BufWritePost			After writing the whole buffer to a file
				(should undo the commands for BufWritePre).
							ChanInfo
ChanInfo			State of channel changed, for instance the
				client of a RPC channel described itself.
				Sets these v:event keys:
				    info
				See nvim_get_chan_info() for the format of
				the info Dictionary.
							ChanOpen
ChanOpen			Just after a channel was opened.
				Sets these v:event keys:
				    info
				See nvim_get_chan_info() for the format of
				the info Dictionary.
							CmdUndefined
CmdUndefined			When a user command is used but it isn't
				defined.  Useful for defining a command only
				when it's used.  The pattern is matched
				against the command name.  Both <amatch> and
				<afile> expand to the command name.
				NOTE: Autocompletion won't work until the
				command is defined.  An alternative is to
				always define the user command and have it
				invoke an autoloaded function.  See autoload.
							CmdlineChanged
CmdlineChanged			After a change was made to the text inside
				command line.  Be careful not to mess up the
				command line, it may cause Vim to lock up.
				<afile> expands to the cmdline-char.
							CmdlineEnter
CmdlineEnter			After entering the command-line (including
				non-interactive use of ":" in a mapping: use
				<Cmd> instead to avoid this).
				The pattern is matched against cmdline-char.
				<afile> expands to the cmdline-char.
				Sets these v:event keys:
				    cmdlevel
				    cmdtype
							CmdlineLeave
CmdlineLeave			Before leaving the command-line (including
				non-interactive use of ":" in a mapping: use
				<Cmd> instead to avoid this).
				<afile> expands to the cmdline-char.
				Sets these v:event keys:
				    abort (mutable)
				    cmdlevel
				    cmdtype
				Note: abort can only be changed from false
				to true: cannot execute an already aborted
				cmdline by changing it to false.
							CmdwinEnter
CmdwinEnter			After entering the command-line window.
				Useful for setting options specifically for
				this special type of window.
				<afile> expands to a single character,
				indicating the type of command-line.
				cmdwin-char
							CmdwinLeave
CmdwinLeave			Before leaving the command-line window.
				Useful to clean up any global setting done
				with CmdwinEnter.
				<afile> expands to a single character,
				indicating the type of command-line.
				cmdwin-char
							ColorScheme
ColorScheme			After loading a color scheme. :colorscheme
				Not triggered if the color scheme is not
				found.
				The pattern is matched against the
				colorscheme name. <afile> can be used for the
				name of the actual file where this option was
				set, and <amatch> for the new colorscheme
				name.

							ColorSchemePre
ColorSchemePre			Before loading a color scheme. :colorscheme
				Useful to setup removing things added by a
				color scheme, before another one is loaded.

CompleteChanged						CompleteChanged
				After each time the Insert mode completion
				menu changed.  Not fired on popup menu hide,
				use CompleteDonePre or CompleteDone for
				that.

				Sets these v:event keys:
				    completed_item	See complete-items.
				    height		nr of items visible
				    width		screen cells
				    row			top screen row
				    col			leftmost screen column
				    size		total nr of items
				    scrollbar		TRUE if visible

				Non-recursive (event cannot trigger itself).
				Cannot change the text. textlock

				The size and position of the popup are also
				available by calling pum_getpos().

							CompleteDonePre
CompleteDonePre			After Insert mode completion is done.  Either
				when something was completed or abandoning
				completion. ins-completion
				complete_info() can be used, the info is
				cleared after triggering CompleteDonePre.
				The v:completed_item variable contains
				information about the completed item.

							CompleteDone
CompleteDone			After Insert mode completion is done.  Either
				when something was completed or abandoning
				completion. ins-completion
				complete_info() cannot be used, the info is
				cleared before triggering CompleteDone.  Use
				CompleteDonePre if you need it.
				v:completed_item gives the completed item.

							CursorHold
CursorHold			When the user doesn't press a key for the time
				specified with 'updatetime'.  Not triggered
				until the user has pressed a key (i.e. doesn't
				fire every 'updatetime' ms if you leave Vim to
				make some coffee. :)  See CursorHold-example
				for previewing tags.
				This event is only triggered in Normal mode.
				It is not triggered when waiting for a command
				argument to be typed, or a movement after an
				operator.
				While recording the CursorHold event is not
				triggered. q
							<CursorHold>
				Internally the autocommand is triggered by the
				<CursorHold> key. In an expression mapping
				getchar() may see this character.

				Note: Interactive commands cannot be used for
				this event.  There is no hit-enter prompt,
				the screen is updated directly (when needed).
				Note: In the future there will probably be
				another option to set the time.
				Hint: to force an update of the status lines
				use: 
					:let &ro = &ro

							CursorHoldI
CursorHoldI			Like CursorHold, but in Insert mode. Not
				triggered when waiting for another key, e.g.
				after CTRL-V, and not in CTRL-X mode
				insert_expand.

							CursorMoved
CursorMoved			After the cursor was moved in Normal or Visual
				mode or to another window.  Also when the text
				of the cursor line has been changed, e.g. with
				"x", "rx" or "p".
				Not always triggered when there is typeahead,
				while executing commands in a script file, or
				when an operator is pending.
				For an example see match-parens.
				Note: Cannot be skipped with :noautocmd.
				Careful: This is triggered very often, don't
				do anything that the user does not expect or
				that is slow.
							CursorMovedI
CursorMovedI			After the cursor was moved in Insert mode.
				Not triggered when the popup menu is visible.
				Otherwise the same as CursorMoved.
							DiffUpdated
DiffUpdated			After diffs have been updated.  Depending on
				what kind of diff is being used (internal or
				external) this can be triggered on every
				change or when doing :diffupdate.
							DirChanged
DirChanged			After the current-directory was changed.
				The pattern can be:
					"window"  to trigger on :lcd
					"tabpage" to trigger on :tcd
					"global"  to trigger on :cd
					"auto"    to trigger on 'autochdir'.
				Sets these v:event keys:
				    cwd:            current working directory
				    scope:          "global", "tabpage", "window"
				    changed_window: v:true if we fired the event
				                    switching window (or tab)
				<afile> is set to the new directory name.
				Non-recursive (event cannot trigger itself).
							DirChangedPre
DirChangedPre			When the current-directory is going to be
				changed, as with DirChanged.
				The pattern is like with DirChanged.
				Sets these v:event keys:
				    directory:      new working directory
				    scope:          "global", "tabpage", "window"
				    changed_window: v:true if we fired the event
				                    switching window (or tab)
				<afile> is set to the new directory name.
				Non-recursive (event cannot trigger itself).
							ExitPre
ExitPre				When using :quit, :wq in a way it makes
				Vim exit, or using :qall, just after
				QuitPre.  Can be used to close any
				non-essential window.  Exiting may still be
				cancelled if there is a modified buffer that
				isn't automatically saved, use VimLeavePre
				for really exiting.
				See also QuitPre, WinClosed.
							FileAppendCmd
FileAppendCmd			Before appending to a file.  Should do the
				appending to the file.  Use the '[ and ']
				marks for the range of lines. Cmd-event
							FileAppendPost
FileAppendPost			After appending to a file.
							FileAppendPre
FileAppendPre			Before appending to a file.  Use the '[ and ']
				marks for the range of lines.
							FileChangedRO
FileChangedRO			Before making the first change to a read-only
				file.  Can be used to checkout the file from
				a source control system.  Not triggered when
				the change was caused by an autocommand.
				Triggered when making the first change in
				a buffer or the first change after 'readonly'
				was set, just before the change is applied to
				the text.
				WARNING: If the autocommand moves the cursor
				the effect of the change is undefined.
							E788
				Cannot switch buffers.  You can reload the
				buffer but not edit another one.
							E881
				If the number of lines changes saving for undo
				may fail and the change will be aborted.
							FileChangedShell
FileChangedShell		When Vim notices that the modification time of
				a file has changed since editing started.
				Also when the file attributes of the file
				change or when the size of the file changes.
				timestamp
				Triggered for each changed file, after:
				- executing a shell command
				- :checktime
				- FocusGained

				Not used when 'autoread' is set and the buffer
				was not changed.  If a FileChangedShell
				autocommand exists the warning message and
				prompt is not given.
				v:fcs_reason indicates what happened. Set
				v:fcs_choice to control what happens next.
				NOTE: Current buffer "%" is not the target
				buffer "<afile>" and "<abuf>". <buffer=abuf>
							E246 E811
				Cannot switch, jump to or delete buffers.
				Non-recursive (event cannot trigger itself).
							FileChangedShellPost
FileChangedShellPost		After handling a file that was changed outside
				of Vim.  Can be used to update the statusline.
							FileReadCmd
FileReadCmd			Before reading a file with a ":read" command.
				Should do the reading of the file. Cmd-event
							FileReadPost
FileReadPost			After reading a file with a ":read" command.
				Note that Vim sets the '[ and '] marks to the
				first and last line of the read.  This can be
				used to operate on the lines just read.
							FileReadPre
FileReadPre			Before reading a file with a ":read" command.
							FileType
FileType			When the 'filetype' option has been set.  The
				pattern is matched against the filetype.
				<afile> is the name of the file where this
				option was set.  <amatch> is the new value of
				'filetype'.
				Cannot switch windows or buffers.
				See filetypes.
							FileWriteCmd
FileWriteCmd			Before writing to a file, when not writing the
				whole buffer.  Should do the writing to the
				file.  Should not change the buffer.  Use the
				'[ and '] marks for the range of lines.
				Cmd-event
							FileWritePost
FileWritePost			After writing to a file, when not writing the
				whole buffer.
							FileWritePre
FileWritePre			Before writing to a file, when not writing the
				whole buffer.  Use the '[ and '] marks for the
				range of lines.
							FilterReadPost
FilterReadPost			After reading a file from a filter command.
				Vim checks the pattern against the name of
				the current buffer as with FilterReadPre.
				Not triggered when 'shelltemp' is off.
							FilterReadPre E135
FilterReadPre			Before reading a file from a filter command.
				Vim checks the pattern against the name of
				the current buffer, not the name of the
				temporary file that is the output of the
				filter command.
				Not triggered when 'shelltemp' is off.
							FilterWritePost
FilterWritePost			After writing a file for a filter command or
				making a diff with an external diff (see
				DiffUpdated for internal diff).
				Vim checks the pattern against the name of
				the current buffer as with FilterWritePre.
				Not triggered when 'shelltemp' is off.
							FilterWritePre
FilterWritePre			Before writing a file for a filter command or
				making a diff with an external diff.
				Vim checks the pattern against the name of
				the current buffer, not the name of the
				temporary file that is the output of the
				filter command.
				Not triggered when 'shelltemp' is off.
							FocusGained
FocusGained			Nvim got focus.
							FocusLost
FocusLost			Nvim lost focus.  Also (potentially) when
				a GUI dialog pops up.
							FuncUndefined
FuncUndefined			When a user function is used but it isn't
				defined.  Useful for defining a function only
				when it's used.  The pattern is matched
				against the function name.  Both <amatch> and
				<afile> are set to the name of the function.
				NOTE: When writing Vim scripts a better
				alternative is to use an autoloaded function.
				See autoload-functions.
							UIEnter
UIEnter				After a UI connects via nvim_ui_attach(), or
				after builtin TUI is started, after VimEnter.
				Sets these v:event keys:
				    chan: channel-id of the UI
							UILeave
UILeave				After a UI disconnects from Nvim, or after
				builtin TUI is stopped, after VimLeave.
				Sets these v:event keys:
				    chan: channel-id of the UI
							InsertChange
InsertChange			When typing <Insert> while in Insert or
				Replace mode.  The v:insertmode variable
				indicates the new mode.
				Be careful not to move the cursor or do
				anything else that the user does not expect.
							InsertCharPre
InsertCharPre			When a character is typed in Insert mode,
				before inserting the char.
				The v:char variable indicates the char typed
				and can be changed during the event to insert
				a different character.  When v:char is set
				to more than one character this text is
				inserted literally.

				Cannot change the text. textlock
							InsertEnter
InsertEnter			Just before starting Insert mode.  Also for
				Replace mode and Virtual Replace mode.  The
				v:insertmode variable indicates the mode.
				Be careful not to do anything else that the
				user does not expect.
				The cursor is restored afterwards.  If you do
				not want that set v:char to a non-empty
				string.
							InsertLeavePre
InsertLeavePre			Just before leaving Insert mode.  Also when
				using CTRL-O i_CTRL-O.  Be careful not to
				change mode or use :normal, it will likely
				cause trouble.
							InsertLeave
InsertLeave			Just after leaving Insert mode.  Also when
				using CTRL-O i_CTRL-O.  But not for i_CTRL-C.
							MenuPopup
MenuPopup			Just before showing the popup menu (under the
				right mouse button).  Useful for adjusting the
				menu for what is under the cursor or mouse
				pointer.
				The pattern is matched against one or two
				characters representing the mode:
					n	Normal
					v	Visual
					o	Operator-pending
					i	Insert
					c	Command line
					tl	Terminal
							ModeChanged
ModeChanged			After changing the mode. The pattern is
				matched against 'old_mode:new_mode', for
				example match against *:c to simulate
				CmdlineEnter.
				The following values of v:event are set:
					old_mode The mode before it changed.
					new_mode The new mode as also returned
						by mode() called with a
						non-zero argument.
				When ModeChanged is triggered, old_mode will
				have the value of new_mode when the event was
				last triggered.
				This will be triggered on every minor mode
				change.
				Usage example to use relative line numbers
				when entering visual mode: 
		:au ModeChanged [vV\x16]*:* let &l:rnu = mode() =~# '^[vV\x16]'
		:au ModeChanged *:[vV\x16]* let &l:rnu = mode() =~# '^[vV\x16]'
		:au WinEnter,WinLeave * let &l:rnu = mode() =~# '^[vV\x16]'
							OptionSet
OptionSet			After setting an option (except during
				startup).  The autocmd-pattern is matched
				against the long option name.  <amatch>
				indicates what option has been set.

				v:option_type indicates whether it's global
				or local scoped.
				v:option_command indicates what type of
				set/let command was used (follow the tag to
				see the table).
				v:option_new indicates the newly set value.
				v:option_oldlocal has the old local value.
				v:option_oldglobal has the old global value.
				v:option_old indicates the old option value.

				v:option_oldlocal is only set when :set
				or :setlocal or a modeline was used to set
				the option. Similarly v:option_oldglobal is
				only set when :set or :setglobal was used.

				This does not set <abuf>, you could use
				bufnr().

				Note that when setting a global-local option
				with :set, then v:option_old is the old
				global value. However, for all options that
				are not global-local it is the old local
				value.

				Usage example: Check for the existence of the
				directory in the 'backupdir' and 'undodir'
				options, create the directory if it doesn't
				exist yet.

				Note: Do not reset the same option during this
				autocommand, that may break plugins. You can
				always use :noautocmd to prevent triggering
				OptionSet.

				Non-recursive: :set in the autocommand does
				not trigger OptionSet again.

				Not triggered on startup.

							QuickFixCmdPre
QuickFixCmdPre			Before a quickfix command is run (:make,
				:lmake, :grep, :lgrep, :grepadd,
				:lgrepadd, :vimgrep, :lvimgrep,
				:vimgrepadd, :lvimgrepadd,
				:cfile, :cgetfile, :caddfile, :lfile,
				:lgetfile, :laddfile, :helpgrep,
				:lhelpgrep, :cexpr, :cgetexpr,
				:caddexpr, :cbuffer, :cgetbuffer,
				:caddbuffer).
				The pattern is matched against the command
				being run.  When :grep is used but 'grepprg'
				is set to "internal" it still matches "grep".
				This command cannot be used to set the
				'makeprg' and 'grepprg' variables.
				If this command causes an error, the quickfix
				command is not executed.
							QuickFixCmdPost
QuickFixCmdPost			Like QuickFixCmdPre, but after a quickfix
				command is run, before jumping to the first
				location. For :cfile and :lfile commands
				it is run after the error file is read and
				before moving to the first error.
				See QuickFixCmdPost-example.
							QuitPre
QuitPre				When using :quit, :wq or :qall, before
				deciding whether it closes the current window
				or quits Vim.  For :wq the buffer is written
				before QuitPre is triggered.  Can be used to
				close any non-essential window if the current
				window is the last ordinary window.
				See also ExitPre, WinClosed.
							RemoteReply
RemoteReply			When a reply from a Vim that functions as
				server was received server2client().  The
				pattern is matched against the {serverid}.
				<amatch> is equal to the {serverid} from which
				the reply was sent, and <afile> is the actual
				reply string.
				Note that even if an autocommand is defined,
				the reply should be read with remote_read()
				to consume it.
							SearchWrapped
SearchWrapped			After making a search with n or N if the
				search wraps around the document back to
				the start/finish respectively.
							RecordingEnter
RecordingEnter			When a macro starts recording.
				The pattern is the current file name, and
				reg_recording() is the current register that
				is used.
							RecordingLeave
RecordingLeave			When a macro stops recording.
				The pattern is the current file name, and
				reg_recording() is the recorded
				register.
				reg_recorded() is only updated after this
				event.
				Sets these v:event keys:
				    regcontents
				    regname
							SafeState
SafeState			When nothing is pending, going to wait for the
				user to type a character.
				This will not be triggered when:
				- an operator is pending
				- a register was entered with "r
				- halfway executing a command
				- executing a mapping
				- there is typeahead
				- Insert mode completion is active
				- Command line completion is active
				You can use mode() to find out what state
				Vim is in.  That may be:
				- Visual mode
				- Normal mode
				- Insert mode
				- Command-line mode
				Depending on what you want to do, you may also
				check more with state(), e.g. whether the
				screen was scrolled for messages.

							SessionLoadPost
SessionLoadPost			After loading the session file created using
				the :mksession command.
							SessionWritePost
SessionWritePost		After writing a session file by calling
				the :mksession command.
							ShellCmdPost
ShellCmdPost			After executing a shell command with :!cmd,
				:make and :grep.  Can be used to check for
				any changed files.
				For non-blocking shell commands, see
				job-control.
							Signal
Signal				After Nvim receives a signal. The pattern is
				matched against the signal name. Only
				"SIGUSR1" and "SIGWINCH" are supported.  Example: 
				    autocmd Signal SIGUSR1 call some#func()
							ShellFilterPost
ShellFilterPost			After executing a shell command with
				":{range}!cmd", ":w !cmd" or ":r !cmd".
				Can be used to check for any changed files.
							SourcePre
SourcePre			Before sourcing a Vimscript/Lua file. :source
				<afile> is the name of the file being sourced.
							SourcePost
SourcePost			After sourcing a Vimscript/Lua file. :source
				<afile> is the name of the file being sourced.
				Not triggered when sourcing was interrupted.
				Also triggered after a SourceCmd autocommand
				was triggered.
							SourceCmd
SourceCmd			When sourcing a Vimscript/Lua file. :source
				<afile> is the name of the file being sourced.
				The autocommand must source that file.
				Cmd-event
							SpellFileMissing
SpellFileMissing		When trying to load a spell checking file and
				it can't be found.  The pattern is matched
				against the language.  <amatch> is the
				language, 'encoding' also matters.  See
				spell-SpellFileMissing.
							StdinReadPost
StdinReadPost			During startup, after reading from stdin into
				the buffer, before executing modelines. --
							StdinReadPre
StdinReadPre			During startup, before reading from stdin into
				the buffer. --
							SwapExists
SwapExists			Detected an existing swap file when starting
				to edit a file.  Only when it is possible to
				select a way to handle the situation, when Vim
				would ask the user what to do.
				The v:swapname variable holds the name of
				the swap file found, <afile> the file being
				edited.  v:swapcommand may contain a command
				to be executed in the opened file.
				The commands should set the v:swapchoice
				variable to a string with one character to
				tell Vim what should be done next:
					'o'	open read-only
					'e'	edit the file anyway
					'r'	recover
					'd'	delete the swap file
					'q'	quit, don't edit the file
					'a'	abort, like hitting CTRL-C
				When set to an empty string the user will be
				asked, as if there was no SwapExists autocmd.
							E812
				Cannot change to another buffer, change
				the buffer name or change directory.
							Syntax
Syntax				When the 'syntax' option has been set.  The
				pattern is matched against the syntax name.
				<afile> expands to the name of the file where
				this option was set. <amatch> expands to the
				new value of 'syntax'.
				See :syn-on.
							TabEnter
TabEnter			Just after entering a tab page. tab-page
				After WinEnter.
				Before BufEnter.
							TabLeave
TabLeave			Just before leaving a tab page. tab-page
				After WinLeave.
							TabNew
TabNew				When creating a new tab page. tab-page
				After WinEnter.
				Before TabEnter.
							TabNewEntered
TabNewEntered			After entering a new tab page. tab-page
				After BufEnter.
							TabClosed
TabClosed			After closing a tab page. <afile> expands to
				the tab page number.
							TermOpen
TermOpen			When a terminal job is starting.  Can be
				used to configure the terminal buffer.
							TermEnter
TermEnter			After entering Terminal-mode.
				After TermOpen.
							TermLeave
TermLeave			After leaving Terminal-mode.
				After TermClose.
							TermClose
TermClose			When a terminal job ends.
				Sets these v:event keys:
				    status
							TermRequest
TermRequest			When a :terminal child process emits an OSC
				or DCS sequence. Sets v:termrequest. The
				event-data is the request string.
							TermResponse
TermResponse			When Nvim receives an OSC or DCS response from
				the host terminal. Sets v:termresponse. The
				event-data is the response string. May be
				triggered during another event (file I/O,
				a shell command, or anything else that takes
				time). Example: 

				-- Query the terminal palette for the RGB value of color 1
				-- (red) using OSC 4
				vim.api.nvim_create_autocmd('TermResponse', {
				  once = true,
				  callback = function(args)
				    local resp = args.data
				    local r, g, b = resp:match("\027%]4;1;rgb:(%w+)/(%w+)/(%w+)")
				  end,
				})
				io.stdout:write("\027]4;1;?\027\\")

							TextChanged
TextChanged			After a change was made to the text in the
				current buffer in Normal mode.  That is after
				b:changedtick has changed (also when that
				happened before the TextChanged autocommand
				was defined).
				Not triggered when there is typeahead or when
				an operator is pending.
				Note: Cannot be skipped with :noautocmd.
				Careful: This is triggered very often, don't
				do anything that the user does not expect or
				that is slow.
							TextChangedI
TextChangedI			After a change was made to the text in the
				current buffer in Insert mode.
				Not triggered when the popup menu is visible.
				Otherwise the same as TextChanged.
							TextChangedP
TextChangedP			After a change was made to the text in the
				current buffer in Insert mode, only when the
				popup menu is visible.  Otherwise the same as
				TextChanged.
							TextChangedT
TextChangedT			After a change was made to the text in the
				current buffer in Terminal-mode.  Otherwise
				the same as TextChanged.
							TextYankPost
TextYankPost			Just after a yank or deleting command, but not
				if the black hole register quote_ is used nor
				for setreg(). Pattern must be "*".
				Sets these v:event keys:
				    inclusive
				    operator
				    regcontents
				    regname
				    regtype
				    visual
				The inclusive flag combined with the '[
				and '] marks can be used to calculate the
				precise region of the operation.

				Non-recursive (event cannot trigger itself).
				Cannot change the text. textlock
							User
User				Not executed automatically.  Use :doautocmd
				to trigger this, typically for "custom events"
				in a plugin.  Example: 
				    :autocmd User MyPlugin echom 'got MyPlugin event'
				    :doautocmd User MyPlugin
							UserGettingBored
UserGettingBored		When the user presses the same key 42 times.
				Just kidding! :-)
							VimEnter
VimEnter			After doing all the startup stuff, including
				loading vimrc files, executing the "-c cmd"
				arguments, creating all windows and loading
				the buffers in them.
				Just before this event is triggered the
				v:vim_did_enter variable is set, so that you
				can do: 
				   if v:vim_did_enter
				     call s:init()
				   else
				     au VimEnter * call s:init()
				   endif
							VimLeave
VimLeave			Before exiting Vim, just after writing the
				.shada file.  Executed only once, like
				VimLeavePre.
				Use v:dying to detect an abnormal exit.
				Use v:exiting to get the exit code.
				Not triggered if v:dying is 2 or more.
							VimLeavePre
VimLeavePre			Before exiting Vim, just before writing the
				.shada file.  This is executed only once,
				if there is a match with the name of what
				happens to be the current buffer when exiting.
				Mostly useful with a "*" pattern. 
				   :autocmd VimLeavePre * call CleanupStuff()
				Use v:dying to detect an abnormal exit.
				Use v:exiting to get the exit code.
				Not triggered if v:dying is 2 or more.
							VimResized
VimResized			After the Vim window was resized, thus 'lines'
				and/or 'columns' changed.  Not when starting
				up though.
							VimResume
VimResume			After Nvim resumes from suspend state.
							VimSuspend
VimSuspend			Before Nvim enters suspend state.
							WinClosed
WinClosed			When closing a window, just before it is
				removed from the window layout.  The pattern
				is matched against the window-ID.  Both
				<amatch> and <afile> are set to the window-ID.
				After WinLeave.
				Non-recursive (event cannot trigger itself).
				See also ExitPre, QuitPre.
							WinEnter
WinEnter			After entering another window.  Not done for
				the first window, when Vim has just started.
				Useful for setting the window height.
				If the window is for another buffer, Vim
				executes the BufEnter autocommands after the
				WinEnter autocommands.
				Note: For split and tabpage commands the
				WinEnter event is triggered after the split
				or tab command but before the file is loaded.

							WinLeave
WinLeave			Before leaving a window.  If the window to be
				entered next is for a different buffer, Vim
				executes the BufLeave autocommands before the
				WinLeave autocommands (but not for ":new").
				Not used for ":qa" or ":q" when exiting Vim.
				Before WinClosed.
							WinNew
WinNew				When a new window was created.  Not done for
				the first window, when Vim has just started.
				Before WinEnter.

							WinScrolled
WinScrolled			After any window in the current tab page
				scrolled the text (horizontally or vertically)
				or changed width or height.  See
				win-scrolled-resized.

				The pattern is matched against the window-ID
				of the first window that scrolled or resized.
				Both <amatch> and <afile> are set to the
				window-ID.

				v:event is set with information about size
				and scroll changes. WinScrolled-event

				Only starts triggering after startup finished
				and the first screen redraw was done.
				Does not trigger when defining the first
				WinScrolled or WinResized event, but may
				trigger when adding more.

				Non-recursive: the event will not trigger
				while executing commands for the WinScrolled
				event.  However, if the command causes a
				window to scroll or change size, then another
				WinScrolled event will be triggered later.


							WinResized
WinResized			After a window in the current tab page changed
				width or height.
				See win-scrolled-resized.

				v:event is set with information about size
				changes. WinResized-event

				Same behavior as WinScrolled for the
				pattern, triggering and recursiveness.

==============================================================================
6. Patterns					autocmd-pattern {aupat}

The {aupat} argument of :autocmd can be a comma-separated list.  This works as
if the command was given with each pattern separately.  Thus this command: 
	:autocmd BufRead *.txt,*.info set et
Is equivalent to: 
	:autocmd BufRead *.txt set et
	:autocmd BufRead *.info set et

The file pattern {aupat} is tested for a match against the file name in one of
two ways:
1. When there is no '/' in the pattern, Vim checks for a match against only
   the tail part of the file name (without its leading directory path).
2. When there is a '/' in the pattern, Vim checks for a match against both the
   short file name (as you typed it) and the full file name (after expanding
   it to a full path and resolving symbolic links).

The special pattern <buffer> or <buffer=N> is used for buffer-local
autocommands autocmd-buflocal.  This pattern is not matched against the name
of a buffer.

Examples: 
	:autocmd BufRead *.txt		set et
Set the 'et' option for all text files. 

	:autocmd BufRead /vim/src/*.c	set cindent
Set the 'cindent' option for C files in the /vim/src directory. 

	:autocmd BufRead /tmp/*.c	set ts=5
If you have a link from "/tmp/test.c" to "/home/nobody/vim/src/test.c", and
you start editing "/tmp/test.c", this autocommand will match.

Note:  To match part of a path, but not from the root directory, use a "*" as
the first character.  Example: 
	:autocmd BufRead */doc/*.txt	set tw=78
This autocommand will for example be executed for "/tmp/doc/xx.txt" and
"/usr/home/piet/doc/yy.txt".  The number of directories does not matter here.


The file name that the pattern is matched against is after expanding
wildcards.  Thus if you issue this command: 
	:e $ROOTDIR/main.$EXT
The argument is first expanded to: 
	/usr/root/main.py
Before it's matched with the pattern of the autocommand.  Careful with this
when using events like FileReadCmd, the value of <amatch> may not be what you
expect.


Environment variables can be used in a pattern: 
	:autocmd BufRead $VIMRUNTIME/doc/*.txt  set expandtab
And ~ can be used for the home directory (if $HOME is defined): 
	:autocmd BufWritePost ~/.config/nvim/init.vim   so <afile>
	:autocmd BufRead ~archive/*      set readonly
The environment variable is expanded when the autocommand is defined, not when
the autocommand is executed.  This is different from the command!

							file-pattern
The pattern is interpreted like mostly used in file names:
	*	matches any sequence of characters; Unusual: includes path
		separators
	?	matches any single character
	\?	matches a '?'
	.	matches a '.'
	~	matches a '~'
	,	separates patterns
	\,	matches a ','
	{ }	like \( \) in a pattern
	,	inside { }: like \| in a pattern
	\}	literal }
	\{	literal {
	\\\{n,m\}  like \{n,m} in a pattern
	\	special meaning like in a pattern
	[ch]	matches 'c' or 'h'
	[^ch]   match any character but 'c' and 'h'

Note that for all systems the '/' character is used for path separator (even
Windows). This was done because the backslash is difficult to use in a pattern
and to make the autocommands portable across different systems.

It is possible to use pattern items, but they may not work as expected,
because of the translation done for the above.

							autocmd-changes
Matching with the pattern is done when an event is triggered.  Changing the
buffer name in one of the autocommands, or even deleting the buffer, does not
change which autocommands will be executed.  Example: 

	au BufEnter *.foo  bdel
	au BufEnter *.foo  set modified

This will delete the current buffer and then set 'modified' in what has become
the current buffer instead.  Vim doesn't take into account that "*.foo"
doesn't match with that buffer name.  It matches "*.foo" with the name of the
buffer at the moment the event was triggered.

However, buffer-local autocommands will not be executed for a buffer that has
been wiped out with :bwipe.  After deleting the buffer with :bdel the
buffer actually still exists (it becomes unlisted), thus the autocommands are
still executed.

==============================================================================
7. Buffer-local autocommands	autocmd-buflocal autocmd-buffer-local
				<buffer> <buffer=N> <buffer=abuf> E680

Buffer-local autocommands are attached to a specific buffer.  They are useful
if the buffer does not have a name and when the name does not match a specific
pattern.  But it also means they must be explicitly added to each buffer.

Instead of a pattern buffer-local autocommands use one of these forms:
	<buffer>	current buffer
	<buffer=99>	buffer number 99
	<buffer=abuf>	using <abuf> (only when executing autocommands)
			<abuf>

Examples: 
    :au CursorHold <buffer>  echo 'hold'
    :au CursorHold <buffer=33>  echo 'hold'
    :au BufNewFile * au CursorHold <buffer=abuf>  echo 'hold'

All the commands for autocommands also work with buffer-local autocommands,
simply use the special string instead of the pattern.  Examples: 
    :au! * <buffer>		     " remove buffer-local autocommands for
				     " current buffer
    :au! * <buffer=33>		     " remove buffer-local autocommands for
				     " buffer #33
    :bufdo :au! CursorHold <buffer>  " remove autocmd for given event for all
				     " buffers
    :au * <buffer>		     " list buffer-local autocommands for
				     " current buffer

Note that when an autocommand is defined for the current buffer, it is stored
with the buffer number.  Thus it uses the form "<buffer=12>", where 12 is the
number of the current buffer.  You will see this when listing autocommands,
for example.

To test for presence of buffer-local autocommands use the exists() function
as follows: 
    :if exists("#CursorHold#<buffer=12>") | ... | endif
    :if exists("#CursorHold#<buffer>") | ... | endif    " for current buffer

When a buffer is wiped out its buffer-local autocommands are also gone, of
course.  Note that when deleting a buffer, e.g., with ":bdel", it is only
unlisted, the autocommands are still present.  In order to see the removal of
buffer-local autocommands: 
    :set verbose=6

It is not possible to define buffer-local autocommands for a non-existent
buffer.

==============================================================================
8. Groups						autocmd-groups

Autocommands can be put together in a group.  This is useful for removing or
executing a group of autocommands.  For example, all the autocommands for
syntax highlighting are put in the "highlight" group, to be able to execute
":doautoall highlight BufRead" when the GUI starts.

When no specific group is selected, Vim uses the default group.  The default
group does not have a name.  You cannot execute the autocommands from the
default group separately; you can execute them only by executing autocommands
for all groups.

Normally, when executing autocommands automatically, Vim uses the autocommands
for all groups.  The group only matters when executing autocommands with
":doautocmd" or ":doautoall", or when defining or deleting autocommands.

The group name can contain any characters except white space.  The group name
"end" is reserved (also in uppercase).

The group name is case sensitive.  Note that this is different from the event
name!

							:aug :augroup
:aug[roup] {name}		Define the autocmd group name for the
				following ":autocmd" commands.  The name "end"
				or "END" selects the default group.
				To avoid confusion, the name should be
				different from existing {event} names, as this
				most likely will not do what you intended.

					:augroup-delete E367 W19 E936
:aug[roup]! {name}		Delete the autocmd group {name}.  Don't use
				this if there is still an autocommand using
				this group!  You will get a warning if doing
				it anyway.  When the group is the current
				group you will get error E936.

To enter autocommands for a specific group, use this method:
1. Select the group with ":augroup {name}".
2. Delete any old autocommands with ":au!".
3. Define the autocommands.
4. Go back to the default group with "augroup END".

Example: 
	:augroup uncompress
	:  au!
	:  au BufEnter *.gz	%!gunzip
	:augroup END

This prevents having the autocommands defined twice (e.g., after sourcing the
vimrc file again).

						FileExplorer
There is one group that is recognized by Vim: FileExplorer.  If this group
exists Vim assumes that editing a directory is possible and will trigger a
plugin that lists the files in that directory.  This is used by the netrw
plugin.  This allows you to do: 
	browse edit

==============================================================================
9. Executing autocommands				autocmd-execute

Vim can also execute Autocommands non-automatically.  This is useful if you
have changed autocommands, or when Vim has executed the wrong autocommands
(e.g., the file pattern match was wrong).

Note that the 'eventignore' option applies here too.  Events listed in this
option will not cause any commands to be executed.

				:do :doau :doaut :doautocmd E217
:do[autocmd] [<nomodeline>] [group] {event} [fname]
			Apply the autocommands matching [fname] (default:
			current file name) for {event} to the current buffer.
			You can use this when the current file name does not
			match the right pattern, after changing settings, or
			to execute autocommands for a certain event.
			It's possible to use this inside an autocommand too,
			so you can base the autocommands for one extension on
			another extension.  Example: 
				:au BufEnter *.cpp so ~/.config/nvim/init_cpp.vim
				:au BufEnter *.cpp doau BufEnter x.c
			Be careful to avoid endless loops.  autocmd-nested

			When the [group] argument is not given, Vim executes
			the autocommands for all groups.  When the [group]
			argument is included, Vim executes only the matching
			autocommands for that group.  Undefined group is an
			error.
							<nomodeline>
			After applying the autocommands the modelines are
			processed, so that their settings overrule the
			settings from autocommands when editing a file. This
			is skipped if <nomodeline> is specified. You probably
			want to use <nomodeline> for events not used when
			loading a buffer, such as User.
			Modelines are also skipped when no matching
			autocommands were executed.

						:doautoa :doautoall
:doautoa[ll] [<nomodeline>] [group] {event} [fname]
			Like ":doautocmd", but apply the autocommands to each
			loaded buffer.  The current buffer is done last.

			Note that [fname] is used to select the autocommands,
			not the buffers to which they are applied. Example: 
				augroup mine
				  autocmd!
				  autocmd FileType * echo expand('<amatch>')
				augroup END
				doautoall mine FileType Loaded-Buffer
			Sourcing this script, you'll see as many
			"Loaded-Buffer" echoed as there are loaded buffers.

			Careful: Don't use this for autocommands that delete a
			buffer, change to another buffer or change the
			contents of a buffer; the result is unpredictable.
			This command is intended for autocommands that set
			options, change highlighting, and things like that.

==============================================================================
10. Using autocommands					autocmd-use

For WRITING FILES there are four possible sets of events.  Vim uses only one
of these sets for a write command:

BufWriteCmd	BufWritePre	BufWritePost	writing the whole buffer
		FilterWritePre	FilterWritePost	writing to filter temp file
FileAppendCmd	FileAppendPre	FileAppendPost	appending to a file
FileWriteCmd	FileWritePre	FileWritePost	any other file write

When there is a matching "*Cmd" autocommand, it is assumed it will do the
writing.  No further writing is done and the other events are not triggered.
Cmd-event

Note that the "*WritePost" commands should undo any changes to the buffer that
were caused by the "*WritePre" commands; otherwise, writing the file will have
the side effect of changing the buffer.

Before executing the autocommands, the buffer from which the lines are to be
written temporarily becomes the current buffer.  Unless the autocommands
change the current buffer or delete the previously current buffer, the
previously current buffer is made the current buffer again.

The "*WritePre" and "*AppendPre" autocommands must not delete the buffer from
which the lines are to be written.

The '[ and '] marks have a special position:
- Before the "*ReadPre" event the '[ mark is set to the line just above where
  the new lines will be inserted.
- Before the "*ReadPost" event the '[ mark is set to the first line that was
  just read, the '] mark to the last line.
- Before executing the "*WriteCmd", "*WritePre" and "*AppendPre" autocommands the '[
  mark is set to the first line that will be written, the '] mark to the last
  line.
Careful: '[ and '] change when using commands that change the buffer.

In commands which expect a file name, you can use "<afile>" for the file name
that is being read :<afile> (you can also use "%" for the current file
name).  "<abuf>" can be used for the buffer number of the currently effective
buffer.  This also works for buffers that don't have a name.  But it doesn't
work for files without a buffer (e.g., with ":r file").

							gzip-example
Examples for reading and writing compressed files: 
  :augroup gzip
  :  autocmd!
  :  autocmd BufReadPre,FileReadPre	*.gz set bin
  :  autocmd BufReadPost,FileReadPost	*.gz '[,']!gunzip
  :  autocmd BufReadPost,FileReadPost	*.gz set nobin
  :  autocmd BufReadPost,FileReadPost	*.gz execute ":doautocmd BufReadPost " .. expand("%:r")
  :  autocmd BufWritePost,FileWritePost	*.gz !mv <afile> <afile>:r
  :  autocmd BufWritePost,FileWritePost	*.gz !gzip <afile>:r

  :  autocmd FileAppendPre		*.gz !gunzip <afile>
  :  autocmd FileAppendPre		*.gz !mv <afile>:r <afile>
  :  autocmd FileAppendPost		*.gz !mv <afile> <afile>:r
  :  autocmd FileAppendPost		*.gz !gzip <afile>:r
  :augroup END

The "gzip" group is used to be able to delete any existing autocommands with
":autocmd!", for when the file is sourced twice.

("<afile>:r" is the file name without the extension, see :_%:)

The commands executed for the BufNewFile, BufRead/BufReadPost, BufWritePost,
FileAppendPost and VimLeave events do not set or reset the changed flag of the
buffer.  When you decompress the buffer with the BufReadPost autocommands, you
can still exit with ":q".  When you use ":undo" in BufWritePost to undo the
changes made by BufWritePre commands, you can still do ":q" (this also makes
"ZZ" work).  If you do want the buffer to be marked as modified, set the
'modified' option.

To execute Normal mode commands from an autocommand, use the ":normal"
command.  Use with care!  If the Normal mode command is not finished, the user
needs to type characters (e.g., after ":normal m" you need to type a mark
name).

If you want the buffer to be unmodified after changing it, reset the
'modified' option.  This makes it possible to exit the buffer with ":q"
instead of ":q!".

							autocmd-nested E218
By default, autocommands do not nest.  For example, if you use ":e" or ":w" in
an autocommand, Vim does not execute the BufRead and BufWrite autocommands for
those commands.  If you do want this, use the "++nested" flag for those
commands in which you want nesting.  For example: 
  :autocmd FileChangedShell *.c ++nested e!
The nesting is limited to 10 levels to get out of recursive loops.

It's possible to use the ":au" command in an autocommand.  This can be a
self-modifying command!  This can be useful for an autocommand that should
execute only once.

If you want to skip autocommands for one command, use the :noautocmd command
modifier or the 'eventignore' option.

Note: When reading a file (with ":read file" or with a filter command) and the
last line in the file does not have an <EOL>, Vim remembers this.  At the next
write (with ":write file" or with a filter command), if the same line is
written again as the last line in a file AND 'binary' is set, Vim does not
supply an <EOL>.  This makes a filter command on the just read lines write the
same file as was read, and makes a write command on just filtered lines write
the same file as was read from the filter.  For example, another way to write
a compressed file: 

  :autocmd FileWritePre *.gz   set bin|'[,']!gzip
  :autocmd FileWritePost *.gz  undo|set nobin

							autocommand-pattern
You can specify multiple patterns, separated by commas.  Here are some
examples: 

  :autocmd BufRead   *		set tw=79 nocin ic infercase fo=2croq
  :autocmd BufRead   .letter	set tw=72 fo=2tcrq
  :autocmd BufEnter  .letter	set dict=/usr/lib/dict/words
  :autocmd BufLeave  .letter	set dict=
  :autocmd BufRead,BufNewFile   *.c,*.h	set tw=0 cin noic
  :autocmd BufEnter  *.c,*.h	abbr FOR for (i = 0; i < 3; ++i)<CR>{<CR>}<Esc>O
  :autocmd BufLeave  *.c,*.h	unabbr FOR

For makefiles (makefile, Makefile, imakefile, makefile.unix, etc.): 

  :autocmd BufEnter  ?akefile*	set include=^s\=include
  :autocmd BufLeave  ?akefile*	set include&

To always start editing C files at the first function: 

  :autocmd BufRead   *.c,*.h	1;/^{

Without the "1;" above, the search would start from wherever the file was
entered, rather than from the start of the file.

						skeleton template
To read a skeleton (template) file when opening a new file: 

  :autocmd BufNewFile  *.c	0r ~/vim/skeleton.c
  :autocmd BufNewFile  *.h	0r ~/vim/skeleton.h
  :autocmd BufNewFile  *.java	0r ~/vim/skeleton.java

To insert the current date and time in a "*.html" file when writing it: 

  :autocmd BufWritePre,FileWritePre *.html   ks|call LastMod()|'s
  :fun LastMod()
  :  if line("$") > 20
  :    let l = 20
  :  else
  :    let l = line("$")
  :  endif
  :  exe "1," .. l .. "g/Last modified: /s/Last modified: .*/Last modified: " ..
  :  \ strftime("%Y %b %d")
  :endfun

You need to have a line "Last modified: <date time>" in the first 20 lines
of the file for this to work.  Vim replaces <date time> (and anything in the
same line after it) with the current date and time.  Explanation:
	ks		mark current position with mark 's'
	call LastMod()  call the LastMod() function to do the work
	's		return the cursor to the old position
The LastMod() function checks if the file is shorter than 20 lines, and then
uses the ":g" command to find lines that contain "Last modified: ".  For those
lines the ":s" command is executed to replace the existing date with the
current one.  The ":execute" command is used to be able to use an expression
for the ":g" and ":s" commands.  The date is obtained with the strftime()
function.  You can change its argument to get another date string.

When entering :autocmd on the command-line, completion of events and command
names may be done (with <Tab>, CTRL-D, etc.) where appropriate.

Vim executes all matching autocommands in the order that you specify them.
It is recommended that your first autocommand be used for all files by using
"*" as the file pattern.  This means that you can define defaults you like
here for any settings, and if there is another matching autocommand it will
override these.  But if there is no other matching autocommand, then at least
your default settings are recovered (if entering this file from another for
which autocommands did match).  Note that "*" will also match files starting
with ".", unlike Unix shells.

						    autocmd-searchpat
Autocommands do not change the current search patterns.  Vim saves the current
search patterns before executing autocommands then restores them after the
autocommands finish.  This means that autocommands do not affect the strings
highlighted with the 'hlsearch' option.  Within autocommands, you can still
use search patterns normally, e.g., with the "n" command.
If you want an autocommand to set the search pattern, such that it is used
after the autocommand finishes, use the ":let @/ =" command.
The search-highlighting cannot be switched off with ":nohlsearch" in an
autocommand.  Use the 'h' flag in the 'shada' option to disable search-
highlighting when starting Vim.

							Cmd-event
When using one of the "*Cmd" events, the matching autocommands are expected to
do the file reading, writing or sourcing.  This can be used when working with
a special kind of file, for example on a remote system.
CAREFUL: If you use these events in a wrong way, it may have the effect of
making it impossible to read or write the matching files!  Make sure you test
your autocommands properly.  Best is to use a pattern that will never match a
normal file name, for example "ftp://*".

When defining a BufReadCmd it will be difficult for Vim to recover a crashed
editing session.  When recovering from the original file, Vim reads only those
parts of a file that are not found in the swap file.  Since that is not
possible with a BufReadCmd, use the :preserve command to make sure the
original file isn't needed for recovery.  You might want to do this only when
you expect the file to be modified.

For file read and write commands the v:cmdarg variable holds the "++enc="
and "++ff=" argument that are effective.  These should be used for the command
that reads/writes the file.  The v:cmdbang variable is one when "!" was
used, zero otherwise.

See the $VIMRUNTIME/plugin/netrwPlugin.vim for examples.

==============================================================================
11. Disabling autocommands				autocmd-disable

To disable autocommands for some time use the 'eventignore' option.  Note that
this may cause unexpected behavior, make sure you restore 'eventignore'
afterwards, using a :try block with :finally.

							:noautocmd :noa
To disable autocommands for just one command use the ":noautocmd" command
modifier.  This will set 'eventignore' to "all" for the duration of the
following command.  Example: 

	:noautocmd w fname.gz

This will write the file without triggering the autocommands defined by the
gzip plugin.

Note that some autocommands are not triggered right away, but only later.
This specifically applies to CursorMoved and TextChanged.


 vim:tw=78:ts=8:noet:ft=help:norl:


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