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574 lines
22 KiB
Plaintext
574 lines
22 KiB
Plaintext
*terminal_emulator.txt* Nvim
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NVIM REFERENCE MANUAL by Thiago de Arruda
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Terminal emulator *terminal* *terminal-emulator*
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Nvim embeds a VT220/xterm terminal emulator based on libvterm. The terminal is
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presented as a special 'buftype', asynchronously updated as data is received
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from the connected program.
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Terminal buffers behave like normal buffers, except:
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- With 'modifiable', lines can be edited but not deleted.
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- 'scrollback' controls how many lines are kept.
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- Output is followed ("tailed") if cursor is on the last line.
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- 'modified' is the default. You can set 'nomodified' to avoid a warning when
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closing the terminal buffer.
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- 'bufhidden' defaults to "hide".
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Type |gO| to see the table of contents.
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==============================================================================
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Start *terminal-start*
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There are several ways to create a terminal buffer:
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- Run the |:terminal| command.
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- Call the |nvim_open_term()| or |termopen()| function.
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- Edit a "term://" buffer. Examples: >vim
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:edit term://bash
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:vsplit term://top
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< Note: To open a "term://" buffer from an autocmd, the |autocmd-nested|
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modifier is required. >vim
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autocmd VimEnter * ++nested split term://sh
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< (This is only mentioned for reference; use |:terminal| instead.)
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When the terminal starts, the buffer contents are updated and the buffer is
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named in the form of `term://{cwd}//{pid}:{cmd}`. This naming scheme is used
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by |:mksession| to restore a terminal buffer (by restarting the {cmd}).
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The terminal environment is initialized as in |jobstart-env|.
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==============================================================================
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Input *terminal-input*
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To send input, enter |Terminal-mode| with |i|, |I|, |a|, |A| or
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|:startinsert|. In this mode all keys except <C-\> are sent to the underlying
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program. If <C-\> is pressed, the next key is sent unless it is <C-N> or <C-O>.
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Use <C-\><C-N> to return to normal mode. |CTRL-\_CTRL-N|
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Use <C-\><C-O> to execute one normal mode command and then return to terminal
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mode. *t_CTRL-\_CTRL-O*
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Terminal-mode forces these local options:
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'cursorlineopt' = number
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'nocursorcolumn'
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'scrolloff' = 0
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'sidescrolloff' = 0
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Terminal-mode has its own |:tnoremap| namespace for mappings, this can be used
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to automate any terminal interaction.
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To map <Esc> to exit terminal-mode: >vim
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:tnoremap <Esc> <C-\><C-n>
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To simulate |i_CTRL-R| in terminal-mode: >vim
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:tnoremap <expr> <C-R> '<C-\><C-N>"'.nr2char(getchar()).'pi'
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To use `ALT+{h,j,k,l}` to navigate windows from any mode: >vim
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:tnoremap <A-h> <C-\><C-N><C-w>h
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:tnoremap <A-j> <C-\><C-N><C-w>j
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:tnoremap <A-k> <C-\><C-N><C-w>k
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:tnoremap <A-l> <C-\><C-N><C-w>l
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:inoremap <A-h> <C-\><C-N><C-w>h
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:inoremap <A-j> <C-\><C-N><C-w>j
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:inoremap <A-k> <C-\><C-N><C-w>k
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:inoremap <A-l> <C-\><C-N><C-w>l
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:nnoremap <A-h> <C-w>h
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:nnoremap <A-j> <C-w>j
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:nnoremap <A-k> <C-w>k
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:nnoremap <A-l> <C-w>l
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You can also create menus similar to terminal mode mappings, but you have to
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use |:tlmenu| instead of |:tmenu|.
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Mouse input has the following behavior:
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- If the program has enabled mouse events, the corresponding events will be
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forwarded to the program.
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- If mouse events are disabled (the default), terminal focus will be lost and
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the event will be processed as in a normal buffer.
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- If another window is clicked, terminal focus will be lost and nvim will jump
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to the clicked window
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- If the mouse wheel is used while the mouse is positioned in another window,
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the terminal won't lose focus and the hovered window will be scrolled.
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==============================================================================
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Configuration *terminal-config*
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Options: 'modified', 'scrollback'
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Events: |TermOpen|, |TermEnter|, |TermLeave|, |TermClose|
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Highlight groups: |hl-TermCursor|, |hl-TermCursorNC|
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Terminal sets local defaults for some options, which may differ from your
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global configuration.
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- 'list' is disabled
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- 'wrap' is disabled
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You can change the defaults with a TermOpen autocommand: >vim
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au TermOpen * setlocal list
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TERMINAL COLORS ~
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The `{g,b}:terminal_color_x` variables control the terminal color palette,
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where `x` is the color index between 0 and 15 inclusive. The variables are
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read during |TermOpen|. The value must be a color name or hexadecimal string.
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Example: >vim
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let g:terminal_color_4 = '#ff0000'
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let g:terminal_color_5 = 'green'
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Only works for RGB UIs (see 'termguicolors'); for 256-color terminals the
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color index is just forwarded.
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Editor highlighting (|syntax-highlighting|, |highlight-groups|, etc.) has
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higher precedence: it is applied after terminal colors are resolved.
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==============================================================================
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Status Variables *terminal-status*
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Terminal buffers maintain some buffer-local variables and options. The values
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are initialized before TermOpen, so you can use them in a local 'statusline'.
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Example: >vim
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:autocmd TermOpen * setlocal statusline=%{b:term_title}
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- *b:term_title* Terminal title (user-writable), typically displayed in the
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window title or tab title of a graphical terminal emulator. Terminal
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programs can set this by emitting an escape sequence.
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- |'channel'| Terminal PTY |job-id|. Can be used with |chansend()| to send
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input to the terminal.
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- The |TermClose| event gives the terminal job exit code in the |v:event|
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"status" field. For example, this autocommand outputs the terminal's exit
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code to |:messages|: >vim
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autocmd TermClose * echom 'Terminal exited with status '..v:event.status
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Use |jobwait()| to check if the terminal job has finished: >vim
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let running = jobwait([&channel], 0)[0] == -1
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==============================================================================
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:Termdebug plugin *terminal-debug*
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The Terminal debugging plugin can be used to debug a program with gdb and view
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the source code in a Vim window. Since this is completely contained inside
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Vim this also works remotely over an ssh connection.
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Starting ~
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*termdebug-starting*
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Load the plugin with this command: >vim
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packadd termdebug
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< *:Termdebug*
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To start debugging use `:Termdebug` or `:TermdebugCommand` followed by the
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command name, for example: >vim
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:Termdebug vim
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This opens two windows:
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gdb window A terminal window in which "gdb vim" is executed. Here you
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can directly interact with gdb.
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program window A terminal window for the executed program. When "run" is
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used in gdb the program I/O will happen in this window, so
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that it does not interfere with controlling gdb.
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The current window is used to show the source code. When gdb pauses the
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source file location will be displayed, if possible. A sign is used to
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highlight the current position, using highlight group debugPC.
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If the buffer in the current window is modified, another window will be opened
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to display the current gdb position.
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Focus the terminal of the executed program to interact with it. This works
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the same as any command running in a terminal window.
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When the debugger ends, typically by typing "quit" in the gdb window, the two
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opened windows are closed.
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Only one debugger can be active at a time.
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*:TermdebugCommand*
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If you want to give specific commands to the command being debugged, you can
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use the `:TermdebugCommand` command followed by the command name and
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additional parameters. >vim
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:TermdebugCommand vim --clean -c ':set nu'
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Both the `:Termdebug` and `:TermdebugCommand` support an optional "!" bang
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argument to start the command right away, without pausing at the gdb window
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(and cursor will be in the debugged window). For example: >vim
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:TermdebugCommand! vim --clean
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To attach gdb to an already running executable or use a core file, pass extra
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arguments. E.g.: >vim
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:Termdebug vim core
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:Termdebug vim 98343
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If no argument is given, you'll end up in a gdb window, in which you need to
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specify which command to run using e.g. the gdb `file` command.
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Example session ~
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*termdebug-example*
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Start in the Vim "src" directory and build Vim: >
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% make
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Start Vim: >
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% ./vim
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Load the termdebug plugin and start debugging Vim: >vim
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:packadd termdebug
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:Termdebug vim
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You should now have three windows:
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source - where you started
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gdb - you can type gdb commands here
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program - the executed program will use this window
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Put focus on the gdb window and type: >
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break ex_help
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run
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Vim will start running in the program window. Put focus there and type: >vim
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:help gui
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Gdb will run into the ex_help breakpoint. The source window now shows the
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ex_cmds.c file. A red "1 " marker will appear in the signcolumn where the
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breakpoint was set. The line where the debugger stopped is highlighted. You
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can now step through the program. You will see the highlighting move as the
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debugger executes a line of source code.
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Run ":Next" a few times until the for loop is highlighted. Put the cursor on
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the end of "eap->arg", then call ":Eval". You will see this displayed:
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"eap->arg": 0x555555e68855 "gui" ~
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This way you can inspect the value of local variables. You can also focus the
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gdb window and use a "print" command, e.g.: >
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print *eap
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If mouse pointer movements are working, Vim will also show a balloon when the
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mouse rests on text that can be evaluated by gdb.
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You can also use the "K" mapping that will either use Nvim floating windows
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to show the results.
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Now go back to the source window and put the cursor on the first line after
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the for loop, then type: >
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:Break
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You will see a "1" marker appear, this indicates the new breakpoint. Now
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run ":Cont" command and the code until the breakpoint will be executed.
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You can type more advanced commands in the gdb window. For example, type: >
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watch curbuf
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Now run ":Cont" (or type "cont" in the gdb window). Execution
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will now continue until the value of "curbuf" changes, which is in do_ecmd().
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To remove this watchpoint again type in the gdb window: >
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delete 3
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You can see the stack by typing in the gdb window: >
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where
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Move through the stack frames, e.g. with: >
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frame 3
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The source window will show the code, at the point where the call was made to
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a deeper level.
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Stepping through code ~
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*termdebug-stepping*
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Put focus on the gdb window to type commands there. Some common ones are:
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- CTRL-C interrupt the program
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- next execute the current line and stop at the next line
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- step execute the current line and stop at the next statement,
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entering functions
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- until execute until past the current cursor line or past a specified
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position or the current stack frame returns
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- finish execute until leaving the current function
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- where show the stack
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- frame N go to the Nth stack frame
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- continue continue execution
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*:Run* *:Arguments*
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In the window showing the source code these commands can be used to control
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gdb:
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`:Run` [args] run the program with [args] or the previous arguments
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`:Arguments` {args} set arguments for the next `:Run`
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*:Break* set a breakpoint at the cursor position
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:Break {position}
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set a breakpoint at the specified position
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*:Tbreak* set a temporary breakpoint at the cursor position
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:Tbreak {position}
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set a temporary breakpoint at the specified position
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*:Clear* delete the breakpoint at the cursor position
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*:Step* execute the gdb "step" command
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*:Over* execute the gdb "next" command (`:Next` is a Vim command)
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*:Until* execute the gdb "until" command
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*:Finish* execute the gdb "finish" command
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*:Continue* execute the gdb "continue" command
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*:Stop* interrupt the program
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If gdb stops at a source line and there is no window currently showing the
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source code, a new window will be created for the source code. This also
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happens if the buffer in the source code window has been modified and can't be
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abandoned.
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Gdb gives each breakpoint a number. In Vim the number shows up in the sign
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column, with a red background. You can use these gdb commands:
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- info break list breakpoints
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- delete N delete breakpoint N
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You can also use the `:Clear` command if the cursor is in the line with the
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breakpoint, or use the "Clear breakpoint" right-click menu entry.
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Inspecting variables ~
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*termdebug-variables* *:Evaluate*
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`:Evaluate` evaluate the expression under the cursor
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`K` same (see |termdebug_map_K| to disable)
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`:Evaluate` {expr} evaluate {expr}
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`:'<,'>Evaluate` evaluate the Visually selected text
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This is similar to using "print" in the gdb window.
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You can usually shorten `:Evaluate` to `:Ev`.
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The result is displayed in a floating window.
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You can move the cursor to this window by running `:Evaluate` (or `K`) again.
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Navigating stack frames ~
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*termdebug-frames* *:Frame* *:Up* *:Down*
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`:Frame` [frame] select frame [frame], which is a frame number,
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address, or function name (default: current frame)
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`:Up` [count] go up [count] frames (default: 1; the frame that
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called the current)
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`+` same (see |termdebug_map_plus| to disable)
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`:Down` [count] go down [count] frames (default: 1; the frame called
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by the current)
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`-` same (see |termdebug_map_minus| to disable)
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Other commands ~
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*termdebug-commands*
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*:Gdb* jump to the gdb window
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*:Program* jump to the window with the running program
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*:Source* jump to the window with the source code, create it if there
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isn't one
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*:Asm* jump to the window with the disassembly, create it if there
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isn't one
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*:Var* jump to the window with the local and argument variables,
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create it if there isn't one. This window updates whenever the
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program is stopped
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Events ~
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*termdebug-events*
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Four autocommands can be used: >vim
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au User TermdebugStartPre echomsg 'debugging starting'
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au User TermdebugStartPost echomsg 'debugging started'
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au User TermdebugStopPre echomsg 'debugging stopping'
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au User TermdebugStopPost echomsg 'debugging stopped'
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<
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*TermdebugStartPre*
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TermdebugStartPre Before starting debugging.
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Not triggered if the debugger is already
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running or the debugger command cannot be
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executed.
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*TermdebugStartPost*
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TermdebugStartPost After debugging has initialized.
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If a "!" bang is passed to `:Termdebug` or
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`:TermdebugCommand` the event is triggered
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before running the provided command in gdb.
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*TermdebugStopPre*
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TermdebugStopPre Before debugging ends, when gdb is terminated,
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most likely after issuing a "quit" command in
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the gdb window.
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*TermdebugStopPost*
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TermdebugStopPost After debugging has ended, gdb-related windows
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are closed, debug buffers wiped out and
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the state before the debugging was restored.
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Customizing ~
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*termdebug-customizing* *g:termdebug_config*
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In the past several global variables were used for configuration. These are
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deprecated and using the g:termdebug_config dictionary is preferred. When
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g:termdebug_config exists the other global variables will NOT be used.
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The recommended way is to start with an empty dictionary: >vim
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let g:termdebug_config = {}
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Then you can add entries to the dictionary as mentioned below. The
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deprecated global variable names are mentioned for completeness. If you are
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switching over to using g:termdebug_config you can find the old variable name
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and take over the value, then delete the deprecated variable.
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Prompt mode ~
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*termdebug-prompt*
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When on MS-Windows, gdb will run in a buffer with 'buftype' set to "prompt".
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This works slightly differently:
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- The gdb window will be in Insert mode while typing commands. Go to Normal
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mode with <Esc>, then you can move around in the buffer, copy/paste, etc.
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Go back to editing the gdb command with any command that starts Insert mode,
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such as `a` or `i`.
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- A separate :terminal window will be opened to run the debugged program in.
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*termdebug_use_prompt*
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Prompt mode can be used with: >vim
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let g:termdebug_config['use_prompt'] = 1
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If there is no g:termdebug_config you can use: >vim
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let g:termdebug_use_prompt = 1
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<
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Mappings ~
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*termdebug_map_K* *termdebug-mappings*
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The K key is normally mapped to |:Evaluate| unless a buffer local (|:map-local|)
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mapping to K already exists. If you do not want this use: >vim
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let g:termdebug_config['map_K'] = 0
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If there is no g:termdebug_config you can use: >vim
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let g:termdebug_map_K = 0
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<
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*termdebug_map_minus*
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The - key is normally mapped to |:Down| unless a buffer local mapping to the -
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key already exists. If you do not want this use: >vim
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let g:termdebug_config['map_minus'] = 0
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<
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*termdebug_map_plus*
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The + key is normally mapped to |:Up| unless a buffer local mapping to the +
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key already exists. If you do not want this use: >vim
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let g:termdebug_config['map_plus'] = 0
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<
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*termdebug_disasm_window*
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If you want the Asm window shown by default, set the "disasm_window" flag to
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1. The "disasm_window_height" entry can be used to set the window height: >vim
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let g:termdebug_config['disasm_window'] = 1
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let g:termdebug_config['disasm_window_height'] = 15
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If there is no g:termdebug_config you can use: >vim
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let g:termdebug_disasm_window = 15
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Any value greater than 1 will set the Asm window height to that value.
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If the current window has enough horizontal space, it will be vertically split
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and the Asm window will be shown side by side with the source code window (and
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the height option won't be used).
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*termdebug_variables_window*
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If you want the Var window shown by default, set the "variables_window" flag
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to 1. The "variables_window_height" entry can be used to set the window
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height: >vim
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let g:termdebug_config['variables_window'] = 1
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let g:termdebug_config['variables_window_height'] = 15
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If there is no g:termdebug_config you can use: >vim
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let g:termdebug_variables_window = 15
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Any value greater than 1 will set the Var window height to that value.
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If the current window has enough horizontal space, it will be vertically split
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and the Var window will be shown side by side with the source code window (and
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the height options won't be used).
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Communication ~
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*termdebug-communication*
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There is another, hidden, buffer, which is used for Vim to communicate with
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gdb. The buffer name is "gdb communication". Do not delete this buffer, it
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will break the debugger.
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Gdb has some weird behavior, the plugin does its best to work around that.
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For example, after typing "continue" in the gdb window a CTRL-C can be used to
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interrupt the running program. But after using the MI command
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"-exec-continue" pressing CTRL-C does not interrupt. Therefore you will see
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"continue" being used for the `:Continue` command, instead of using the
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communication channel.
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GDB command ~
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*g:termdebugger*
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To change the name of the gdb command, set "debugger" entry in
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g:termdebug_config or the "g:termdebugger" variable before invoking
|
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`:Termdebug`: >vim
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let g:termdebug_config['command'] = "mygdb"
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If there is no g:termdebug_config you can use: >vim
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let g:termdebugger = "mygdb"
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If the command needs an argument use a List: >vim
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let g:termdebug_config['command'] = ['rr', 'replay', '--']
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If there is no g:termdebug_config you can use: >vim
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let g:termdebugger = ['rr', 'replay', '--']
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If you are a mouse person, you can also define a mapping using your right
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click to one of the terminal command like evaluate the variable under the
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cursor: >vim
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nnoremap <RightMouse> :Evaluate<CR>
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or set/unset a breakpoint: >vim
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nnoremap <RightMouse> :Break<CR>
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Several arguments will be added to make gdb work well for the debugger.
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If you want to modify them, add a function to filter the argument list: >vim
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let g:termdebug_config['command_filter'] = MyDebugFilter
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|
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|
If you do not want the arguments to be added, but you do need to set the
|
|
"pty", use a function to add the necessary arguments: >vim
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|
let g:termdebug_config['command_add_args'] = MyAddArguments
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|
The function will be called with the list of arguments so far, and a second
|
|
argument that is the name of the pty.
|
|
*gdb-version*
|
|
Only debuggers fully compatible with gdb will work. Vim uses the GDB/MI
|
|
interface. The "new-ui" command requires gdb version 7.12 or later. If you
|
|
get this error:
|
|
Undefined command: "new-ui". Try "help".~
|
|
Then your gdb is too old.
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|
Colors ~
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|
*hl-debugPC* *hl-debugBreakpoint*
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|
The color of the signs can be adjusted with these highlight groups:
|
|
- debugPC the current position
|
|
- debugBreakpoint a breakpoint
|
|
|
|
The defaults are, when 'background' is "light":
|
|
hi debugPC term=reverse ctermbg=lightblue guibg=lightblue
|
|
hi debugBreakpoint term=reverse ctermbg=red guibg=red
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|
|
When 'background' is "dark":
|
|
hi debugPC term=reverse ctermbg=darkblue guibg=darkblue
|
|
hi debugBreakpoint term=reverse ctermbg=red guibg=red
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|
|
Shortcuts ~
|
|
*termdebug_shortcuts*
|
|
You can define your own shortcuts (mappings) to control gdb, that can work in
|
|
any window, using the TermDebugSendCommand() function. Example: >vim
|
|
map ,w :call TermDebugSendCommand('where')<CR>
|
|
The argument is the gdb command.
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|
|
|
|
|
Popup menu ~
|
|
*termdebug_popup*
|
|
By default the Termdebug plugin sets 'mousemodel' to "popup_setpos" and adds
|
|
these entries to the popup menu:
|
|
Set breakpoint `:Break`
|
|
Clear breakpoint `:Clear`
|
|
Evaluate `:Evaluate`
|
|
If you don't want this then disable it with: >vim
|
|
let g:termdebug_config['popup'] = 0
|
|
If there is no g:termdebug_config you can use: >vim
|
|
let g:termdebug_popup = 0
|
|
|
|
|
|
Change default signs ~
|
|
*termdebug_signs*
|
|
Termdebug uses the hex number of the breakpoint ID in the signcolumn to
|
|
represent breakpoints. if it is greater than "0xFF", then it will be displayed
|
|
as "F+", due to we really only have two screen cells for the sign.
|
|
|
|
If you want to customize the breakpoint signs: >vim
|
|
let g:termdebug_config['sign'] = '>>'
|
|
If there is no g:terminal_config yet you can use: >vim
|
|
let g:termdebug_config = {'sign': '>>'}
|
|
|
|
After this, breakpoints will be displayed as `>>` in the signcolumn.
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|
|
|
|
|
Vim window width ~
|
|
*termdebug_wide*
|
|
To change the width of the Vim window when debugging starts and use a vertical
|
|
split: >vim
|
|
let g:termdebug_config['wide'] = 163
|
|
If there is no g:termdebug_config you can use: >vim
|
|
let g:termdebug_wide = 163
|
|
|
|
This will set 'columns' to 163 when `:Termdebug` is used. The value is
|
|
restored when quitting the debugger.
|
|
|
|
If the wide value is set and 'columns' is already a greater value, then a
|
|
vertical split will be used without modifying 'columns'.
|
|
|
|
Set the wide value to 1 to use a vertical split without ever changing
|
|
'columns'. This is useful when the terminal can't be resized by Vim.
|
|
|
|
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|
vim:tw=78:ts=8:noet:ft=help:norl:
|