neovim/runtime/doc/term.txt

*term.txt*      Nvim


		  VIM REFERENCE MANUAL    by Bram Moolenaar


Terminal information

Vim uses information about the terminal you are using to fill the screen and
recognize what keys you hit.  If this information is not correct, the screen
may be messed up or keys may not be recognized.  The actions which have to be
performed on the screen are accomplished by outputting a string of
characters.

                                      Type <M-]> to see the table of contents.

==============================================================================
Startup						*startup-terminal*

When Vim is started a default terminal type is assumed.  for MS-DOS this is
the pc terminal, for Unix an ansi terminal.

				*termcap* *terminfo* *E557* *E558* *E559*
On Unix the terminfo database or termcap file is used.  This is referred to as
"termcap" in all the documentation.

Settings depending on terminal			*term-dependent-settings*

If you want to set options or mappings, depending on the terminal name, you
can do this best in your vimrc.  Example: >

   if &term == "xterm"
     ... xterm maps and settings ...
   elseif &term =~ "vt10."
     ... vt100, vt102 maps and settings ...
   endif
<
							*cs7-problem*
Note: If the terminal settings are changed after running Vim, you might have
an illegal combination of settings.  This has been reported on Solaris 2.5
with "stty cs8 parenb", which is restored as "stty cs7 parenb".  Use
"stty cs8 -parenb -istrip" instead, this is restored correctly.

Many cursor key codes start with an <Esc>.  Vim must find out if this is a
single hit of the <Esc> key or the start of a cursor key sequence.  It waits
for a next character to arrive.  If it does not arrive within one second a
single <Esc> is assumed.  On very slow systems this may fail, causing cursor
keys not to work sometimes.  If you discover this problem reset the 'timeout'
option.  Vim will wait for the next character to arrive after an <Esc>.  If
you want to enter a single <Esc> you must type it twice.

Some terminals have confusing codes for the cursor keys.  The televideo 925 is
such a terminal.  It sends a CTRL-H for cursor-left.  This would make it
impossible to distinguish a backspace and cursor-left.  To avoid this problem
CTRL-H is never recognized as cursor-left.

					*vt100-cursor-keys* *xterm-cursor-keys*
Other terminals (e.g., vt100 and xterm) have cursor keys that send <Esc>OA,
<Esc>OB, etc.  Unfortunately these are valid commands in insert mode: Stop
insert, Open a new line above the new one, start inserting 'A', 'B', etc.
Instead of performing these commands Vim will erroneously recognize this typed
key sequence as a cursor key movement.  To avoid this and make Vim do what you
want in either case you could use these settings: >
	:set notimeout		" don't timeout on mappings
	:set ttimeout		" do timeout on terminal key codes
	:set timeoutlen=100	" timeout after 100 msec
This requires the key-codes to be sent within 100 msec in order to recognize
them as a cursor key.  When you type you normally are not that fast, so they
are recognized as individual typed commands, even though Vim receives the same
sequence of bytes.

						*xterm-8bit* *xterm-8-bit*
Xterm can be run in a mode where it uses 8-bit escape sequences.  The CSI code
is used instead of <Esc>[.  The advantage is that an <Esc> can quickly be
recognized in Insert mode, because it can't be confused with the start of a
special key.
For the builtin termcap entries, Vim checks if the 'term' option contains
"8bit" anywhere.  It then uses 8-bit characters for the termcap entries, the
mouse and a few other things.  You would normally set $TERM in your shell to
"xterm-8bit" and Vim picks this up and adjusts to the 8-bit setting
automatically.
When Vim receives a response to the "request version" sequence and it
starts with CSI, it assumes that the terminal is in 8-bit mode and will
convert all key sequences to their 8-bit variants.

==============================================================================
Window size						*window-size*

[This is about the size of the whole window Vim is using, not a window that is
created with the ":split" command.]

On Unix systems, three methods are tried to get the window size:

- an ioctl call (TIOCGSIZE or TIOCGWINSZ, depends on your system)
- the environment variables "LINES" and "COLUMNS"
- from the termcap entries "li" and "co"

If everything fails a default size of 24 lines and 80 columns is assumed.  If
a window-resize signal is received the size will be set again.  If the window
size is wrong you can use the 'lines' and 'columns' options to set the
correct values.

One command can be used to set the screen size:

						*:mod* *:mode*
:mod[e]

Detects the screen size and redraws the screen.

==============================================================================
Slow and fast terminals				*slow-fast-terminal*
						*slow-terminal*

If you have a fast terminal you may like to set the 'ruler' option.  The
cursor position is shown in the status line.  If you are using horizontal
scrolling ('wrap' option off) consider setting 'sidescroll' to a small
number.

If you have a slow terminal you may want to reset the 'showcmd' option.
The command characters will not be shown in the status line.  If the terminal
scrolls very slowly, set the 'scrolljump' to 5 or so.  If the cursor is moved
off the screen (e.g., with "j") Vim will scroll 5 lines at a time.  Another
possibility is to reduce the number of lines that Vim uses with the command
"z{height}<CR>".

If the characters from the terminal are arriving with more than 1 second
between them you might want to set the 'timeout' and/or 'ttimeout' option.
See the "Options" chapter |options|.

If you are using a color terminal that is slow, use this command: >
	hi NonText cterm=NONE ctermfg=NONE
This avoids that spaces are sent when they have different attributes.  On most
terminals you can't see this anyway.

If you are using Vim over a slow serial line, you might want to try running
Vim inside the "screen" program.  Screen will optimize the terminal I/O quite
a bit.

If you are testing termcap options, but you cannot see what is happening,
you might want to set the 'writedelay' option.  When non-zero, one character
is sent to the terminal at a time (does not work for MS-DOS).  This makes the
screen updating a lot slower, making it possible to see what is happening.

==============================================================================
Using the mouse						*mouse-using*

This section is about using the mouse on a terminal or a terminal window.  How
to use the mouse in a GUI window is explained in |gui-mouse|.  For scrolling
with a mouse wheel see |scroll-mouse-wheel|.

These characters in the 'mouse' option tell in which situations the mouse will
be used by Vim:
		n	Normal mode
		v	Visual mode
		i	Insert mode
		c	Command-line mode
		h	all previous modes when in a help file
		a	all previous modes
		r	for |hit-enter| prompt

If you only want to use the mouse in a few modes or also want to use it for
the two questions you will have to concatenate the letters for those modes.
For example: >
	:set mouse=nv
Will make the mouse work in Normal mode and Visual mode. >
	:set mouse=h
Will make the mouse work in help files only (so you can use "g<LeftMouse>" to
jump to tags).

Whether the selection that is started with the mouse is in Visual mode or
Select mode depends on whether "mouse" is included in the 'selectmode'
option.

In an xterm, with the currently active mode included in the 'mouse' option,
normal mouse clicks are used by Vim, mouse clicks with the shift or ctrl key
pressed go to the xterm.  With the currently active mode not included in
'mouse' all mouse clicks go to the xterm.

							*xterm-clipboard*
The middle mouse button will insert the unnamed register.  In that case, here
is how you copy and paste a piece of text:

Copy/paste with the mouse and Visual mode ('mouse' option must be set, see
above):
1. Press left mouse button on first letter of text, move mouse pointer to last
   letter of the text and release the button.  This will start Visual mode and
   highlight the selected area.
2. Press "y" to yank the Visual text in the unnamed register.
3. Click the left mouse button at the insert position.
4. Click the middle mouse button.

Shortcut: If the insert position is on the screen at the same time as the
Visual text, you can do 2, 3 and 4 all in one: Click the middle mouse button
at the insert position.

							*xterm-copy-paste*
NOTE: In some (older) xterms, it's not possible to move the cursor past column
95 or 223.  This is an xterm problem, not Vim's.  Get a newer xterm
|color-xterm|.

Copy/paste in xterm with (current mode NOT included in 'mouse'):
1. Press left mouse button on first letter of text, move mouse pointer to last
   letter of the text and release the button.
2. Use normal Vim commands to put the cursor at the insert position.
3. Press "a" to start Insert mode.
4. Click the middle mouse button.
5. Press ESC to end Insert mode.
(The same can be done with anything in 'mouse' if you keep the shift key
pressed while using the mouse.)

Note: if you lose the 8th bit when pasting (special characters are translated
into other characters), you may have to do "stty cs8 -istrip -parenb" in your
shell before starting Vim.

Thus in an xterm the shift and ctrl keys cannot be used with the mouse.  Mouse
commands requiring the CTRL modifier can be simulated by typing the "g" key
before using the mouse:
	"g<LeftMouse>"	is "<C-LeftMouse>	(jump to tag under mouse click)
	"g<RightMouse>" is "<C-RightMouse>	("CTRL-T")

							*bracketed-paste-mode*
Bracketed paste mode allows terminal emulators to distinguish between typed
text and pasted text.

For terminal emulators that support it, this mode is enabled by default. Thus
you can paste text without Nvim giving any special meaning to it, e.g. it will
not auto-indent the pasted text. See https://cirw.in/blog/bracketed-paste for
technical details.

					*mouse-mode-table* *mouse-overview*
A short overview of what the mouse buttons do, when 'mousemodel' is "extend":

Normal Mode:
event	      position	   selection	  change  action	~
	       cursor			  window		~
<LeftMouse>     yes	     end	    yes
<C-LeftMouse>   yes	     end	    yes	   "CTRL-]" (2)
<S-LeftMouse>   yes	  no change	    yes	   "*" (2)    *<S-LeftMouse>*
<LeftDrag>      yes	start or extend (1) no		      *<LeftDrag>*
<LeftRelease>   yes	start or extend (1) no
<MiddleMouse>   yes	  if not active     no	   put
<MiddleMouse>   yes	  if active	    no	   yank and put
<RightMouse>    yes	start or extend     yes
<A-RightMouse>  yes start or extend blockw. yes		      *<A-RightMouse>*
<S-RightMouse>  yes	   no change	    yes	   "#" (2)    *<S-RightMouse>*
<C-RightMouse>  no	   no change	    no	   "CTRL-T"
<RightDrag>     yes	    extend	    no		      *<RightDrag>*
<RightRelease>  yes	    extend	    no		      *<RightRelease>*

Insert or Replace Mode:
event	      position	   selection	  change  action	~
	       cursor			  window		~
<LeftMouse>     yes     (cannot be active)  yes
<C-LeftMouse>   yes     (cannot be active)  yes	   "CTRL-O^]" (2)
<S-LeftMouse>   yes     (cannot be active)  yes	   "CTRL-O*" (2)
<LeftDrag>      yes     start or extend (1) no	   like CTRL-O (1)
<LeftRelease>   yes     start or extend (1) no	   like CTRL-O (1)
<MiddleMouse>   no      (cannot be active)  no	   put register
<RightMouse>    yes     start or extend	    yes	   like CTRL-O
<A-RightMouse>  yes start or extend blockw. yes
<S-RightMouse>  yes     (cannot be active)  yes	   "CTRL-O#" (2)
<C-RightMouse>  no	(cannot be active)  no	   "CTRL-O CTRL-T"

In a help window:
event	      position	   selection	  change  action	~
	       cursor			  window		~
<2-LeftMouse>   yes     (cannot be active)  no	   "^]" (jump to help tag)

When 'mousemodel' is "popup", these are different:

Normal Mode:
event	      position	   selection	  change  action	~
	       cursor			  window		~
<S-LeftMouse>	yes	start or extend (1) no
<A-LeftMouse>   yes start or extend blockw. no		      *<A-LeftMouse>*
<RightMouse>	no	popup menu	    no

Insert or Replace Mode:
event	      position	   selection	  change  action	~
	       cursor			  window		~
<S-LeftMouse>   yes     start or extend (1) no	   like CTRL-O (1)
<A-LeftMouse>   yes start or extend blockw. no
<RightMouse>    no	popup menu	    no

(1) only if mouse pointer moved since press
(2) only if click is in same buffer

Clicking the left mouse button causes the cursor to be positioned.  If the
click is in another window that window is made the active window.  When
editing the command-line the cursor can only be positioned on the
command-line.  When in Insert mode Vim remains in Insert mode.  If 'scrolloff'
is set, and the cursor is positioned within 'scrolloff' lines from the window
border, the text is scrolled.

A selection can be started by pressing the left mouse button on the first
character, moving the mouse to the last character, then releasing the mouse
button.  You will not always see the selection until you release the button,
only in some versions (GUI, Windows) will the dragging be shown immediately.
Note that you can make the text scroll by moving the mouse at least one
character in the first/last line in the window when 'scrolloff' is non-zero.

In Normal, Visual and Select mode clicking the right mouse button causes the
Visual area to be extended.  When 'mousemodel' is "popup", the left button has
to be used while keeping the shift key pressed.  When clicking in a window
which is editing another buffer, the Visual or Select mode is stopped.

In Normal, Visual and Select mode clicking the right mouse button with the alt
key pressed causes the Visual area to become blockwise.  When 'mousemodel' is
"popup" the left button has to be used with the alt key.  Note that this won't
work on systems where the window manager consumes the mouse events when the
alt key is pressed (it may move the window).

							*double-click*
Double, triple and quadruple clicks are supported when the GUI is active, for
Windows and for an xterm.  For selecting text, extra clicks extend the
selection:
	click		select ~
	double		word or % match		*<2-LeftMouse>*
	triple		line			*<3-LeftMouse>*
	quadruple	rectangular block	*<4-LeftMouse>*
Exception: In a Help window a double click jumps to help for the word that is
clicked on.
A double click on a word selects that word.  'iskeyword' is used to specify
which characters are included in a word.  A double click on a character
that has a match selects until that match (like using "v%").  If the match is
an #if/#else/#endif block, the selection becomes linewise.
For MS-DOS and xterm the time for double clicking can be set with the
'mousetime' option.  For the other systems this time is defined outside of
Vim.
An example, for using a double click to jump to the tag under the cursor: >
	:map <2-LeftMouse> :exe "tag ". expand("<cword>")<CR>

Dragging the mouse with a double click (button-down, button-up, button-down
and then drag) will result in whole words to be selected.  This continues
until the button is released, at which point the selection is per character
again.

In Insert mode, when a selection is started, Vim goes into Normal mode
temporarily.  When Visual or Select mode ends, it returns to Insert mode.
This is like using CTRL-O in Insert mode.  Select mode is used when the
'selectmode' option contains "mouse".
							*drag-status-line*
When working with several windows, the size of the windows can be changed by
dragging the status line with the mouse.  Point the mouse at a status line,
press the left button, move the mouse to the new position of the status line,
release the button.  Just clicking the mouse in a status line makes that window
the current window, without moving the cursor.  If by selecting a window it
will change position or size, the dragging of the status line will look
confusing, but it will work (just try it).

					*<MiddleRelease>* *<MiddleDrag>*
Mouse clicks can be mapped.  The codes for mouse clicks are:
     code	    mouse button	      normal action	~
 <LeftMouse>	 left pressed		    set cursor position
 <LeftDrag>	 left moved while pressed   extend selection
 <LeftRelease>	 left released		    set selection end
 <MiddleMouse>	 middle pressed		    paste text at cursor position
 <MiddleDrag>	 middle moved while pressed -
 <MiddleRelease> middle released	    -
 <RightMouse>	 right pressed		    extend selection
 <RightDrag>	 right moved while pressed  extend selection
 <RightRelease>  right released		    set selection end
 <X1Mouse>	 X1 button pressed	    -			*X1Mouse*
 <X1Drag>	 X1 moved while pressed	    -			*X1Drag*
 <X1Release>	 X1 button release	    -			*X1Release*
 <X2Mouse>	 X2 button pressed	    -			*X2Mouse*
 <X2Drag>	 X2 moved while pressed     -			*X2Drag*
 <X2Release>	 X2 button release	    -			*X2Release*

The X1 and X2 buttons refer to the extra buttons found on some mice.  The
'Microsoft Explorer' mouse has these buttons available to the right thumb.
Currently X1 and X2 only work on Win32 and X11 environments.

Examples: >
	:noremap <MiddleMouse> <LeftMouse><MiddleMouse>
Paste at the position of the middle mouse button click (otherwise the paste
would be done at the cursor position). >

	:noremap <LeftRelease> <LeftRelease>y
Immediately yank the selection, when using Visual mode.

Note the use of ":noremap" instead of "map" to avoid a recursive mapping.
>
	:map <X1Mouse> <C-O>
	:map <X2Mouse> <C-I>
Map the X1 and X2 buttons to go forwards and backwards in the jump list, see
|CTRL-O| and |CTRL-I|.

						*mouse-swap-buttons*
To swap the meaning of the left and right mouse buttons: >
	:noremap	<LeftMouse>	<RightMouse>
	:noremap	<LeftDrag>	<RightDrag>
	:noremap	<LeftRelease>	<RightRelease>
	:noremap	<RightMouse>	<LeftMouse>
	:noremap	<RightDrag>	<LeftDrag>
	:noremap	<RightRelease>	<LeftRelease>
	:noremap	g<LeftMouse>	<C-RightMouse>
	:noremap	g<RightMouse>	<C-LeftMouse>
	:noremap!	<LeftMouse>	<RightMouse>
	:noremap!	<LeftDrag>	<RightDrag>
	:noremap!	<LeftRelease>	<RightRelease>
	:noremap!	<RightMouse>	<LeftMouse>
	:noremap!	<RightDrag>	<LeftDrag>
	:noremap!	<RightRelease>	<LeftRelease>
<
 vim:tw=78:ts=8:ft=help:norl: