*nvim_terminal_emulator.txt*    For Nvim.				{Nvim}


		 NVIM REFERENCE MANUAL    by Thiago de Arruda


Nvim integrated terminal emulator		     *nvim-terminal-emulator*

1. Introduction			|nvim-terminal-emulator-introduction|
2. Spawning			|nvim-terminal-emulator-spawning|
3. Input			|nvim-terminal-emulator-input|
4. Configuration		|nvim-terminal-emulator-configuration|

==============================================================================
1. Introduction			      *nvim-terminal-emulator-introduction*

One feature that distinguishes Nvim from Vim is that it implements a mostly
complete VT220/xterm-like terminal emulator. The terminal is presented to the
user as a special buffer type, one that is asynchronously updated to mirror
the virtual terminal display as data is received from the program connected
to it. For most purposes, terminal buffers behave a lot like normal buffers
with 'nomodifiable' set.


The implementation is powered by libvterm[1], a powerful abstract terminal
emulation library.

[1]: http://www.leonerd.org.uk/code/libvterm/

==============================================================================
2. Spawning			      *nvim-terminal-emulator-spawning*

There are 3 ways to create a terminal buffer:

- By invoking the |:terminal| ex command.
- By calling the |termopen()| function.
- By editing a file with a name matching `term://(.{-}//(\d+:)?)?\zs.*`.
  For example:
>
    :e term://bash
    :vsp term://top
<
When the terminal spawns the program, the buffer will start to mirror the
terminal display and change its name to `term://$CWD//$PID:$COMMAND`.
Note that |:mksession| will "save" the terminal buffers by restarting all
programs when the session is restored.

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3. Input			      *nvim-terminal-emulator-input*

Sending input is possible by entering terminal mode, which is achieved by
pressing any key that would enter insert mode in a normal buffer (|i| or |a|
for example). The |:terminal| ex command will automatically enter terminal
mode once it's spawned. While in terminal mode, Nvim will forward all keys to
the underlying program. The only exception is the <C-\><C-n> key combo,
which will exit back to normal mode.

Terminal mode has its own namespace for mappings, which is accessed with the
"t" prefix. It's possible to use terminal mappings to customize interaction
with the terminal. For example, here's how to map <Esc> to exit terminal mode:
>
    :tnoremap <Esc> <C-\><C-n>
<
Navigating to other windows is only possible by exiting to normal mode, which
can be cumbersome with <C-\><C-n> keys. Here are some mappings to improve
the navigation experience:
>
    :tnoremap <A-h> <C-\><C-n><C-w>h
    :tnoremap <A-j> <C-\><C-n><C-w>j
    :tnoremap <A-k> <C-\><C-n><C-w>k
    :tnoremap <A-l> <C-\><C-n><C-w>l
    :nnoremap <A-h> <C-w>h
    :nnoremap <A-j> <C-w>j
    :nnoremap <A-k> <C-w>k
    :nnoremap <A-l> <C-w>l
<
This allows using `Alt+{h,j,k,l}` to navigate between windows no matter if
they are displaying a normal buffer or a terminal buffer in terminal mode.

Mouse input is also fully supported, and has the following behavior:

- If the program has enabled mouse events, the corresponding events will be
  forwarded to the program.
- If mouse events are disabled (the default), terminal focus will be lost and
  the event will be processed as in a normal buffer.
- If another window is clicked, terminal focus will be lost and nvim will jump
  to the clicked window
- If the mouse wheel is used while the mouse is positioned in another window,
  the terminal wont lose focus and the hovered window will be scrolled.

==============================================================================
4. Configuration		     *nvim-terminal-emulator-configuration*

Terminal buffers can be customized through the following global/buffer-local
variables (set via the |TermOpen| autocmd):

- `{g,b}:terminal_scrollback_buffer_size`: Scrollback buffer size, between 1
  and 100000 inclusive. The default is 1000.
- `{g,b}:terminal_color_$NUM`: The terminal color palette, where `$NUM` is the
  color index, between 0 and 255 inclusive. This only affects UIs with RGB
  capabilities; for normal terminals the color index is simply forwarded.
- `{g,b}:terminal_focused_cursor_highlight`: Highlight group applied to the
  cursor in a focused terminal. The default equivalent to having a group with
  `cterm=reverse` `gui=reverse``.
- `{g,b}:terminal_unfocused_cursor_highlight`: Highlight group applied to the
  cursor in an unfocused terminal. The default equivalent to having a group with
  `ctermbg=11` `guibg=#fce94f``.

The configuration variables are only processed when the terminal starts, which
is why it needs to be done with the |TermOpen| autocmd or setting global
variables before the terminal is started.

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