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intro.txt     Nvim

                            NVIM REFERENCE MANUAL

Nvim                                                    ref reference

                                      Type gO to see the table of contents.

Introduction                                            intro

Vim is a text editor which includes most commands from the Unix program "Vi"
and many new ones.

An overview of this manual can be found in the file "help.txt", help.txt.
It can be accessed from within Vim with the <Help> or <F1> key and with the
:help command (just type ":help", without the bars or quotes).
   The 'helpfile' option can be set to the name of the help file, in case it
is not located in the default place.  You can jump to subjects like with tags:
Use CTRL-] to jump to a subject under the cursor, use CTRL-T to jump back.

Vim is pronounced as one word, like Jim.  So Nvim is N-Jim, which sounds like
"Ninja".  Starting Nvim is like performing a roundhouse kick.

This manual is a reference for all Nvim editor and API features.  It is not an
introduction; instead for beginners, there is a hands-on tutor and a user
manual usr_toc.txt.

There are many books on Vi and Vim.  We recommend:

        "Practical Vim" by Drew Neil
        "Modern Vim" by Drew Neil

"Practical Vim" is acclaimed for its focus on quickly learning common editing
tasks with Vim.  "Modern Vim" explores new features in Nvim and Vim 8.

        "Vim - Vi Improved" by Steve Oualline

This was the first book dedicated to Vim.  Parts of it were included in the
user manual. frombook  ISBN: 0735710015
For more information try one of these:

Nvim on the interwebs                                   internet

                        www faq distribution download

        Nvim home page:   https://neovim.io/
        Nvim FAQ:         https://github.com/neovim/neovim/wiki/FAQ
        Downloads:        https://github.com/neovim/neovim/releases
        Vim FAQ:          https://vimhelp.org/vim_faq.txt.html

                        bugs bug-report
Report bugs and request features here:

Be brief, yet complete.  Always give a reproducible example and try to find
out which settings or other things trigger the bug.

If Nvim crashes, try to get a backtrace.  See debug.txt.

Sponsor Vim/Nvim development                             register

Fixing bugs and adding new features takes a lot of time and effort.  To show
your appreciation for the work and motivate Bram and others to continue
working on Vim please send a donation.

Since Bram is back to a paid job the money will now be used to help children
in Uganda.  See uganda.  But at the same time donations increase Bram's
motivation to keep working on Vim!

For the most recent information about sponsoring look on the Vim web site:


Neovim development is funded separately from Vim:


Credits                         credits

Most of Vim was written by Bram Moolenaar <Bram@vim.org>.

Parts of the documentation come from several Vi manuals, written by:
        W.N. Joy
        Alan P.W. Hewett
        Mark Horton

The Vim editor is based on Stevie and includes (ideas from) other software,
worked on by the people mentioned here.  Other people helped by sending me
patches, suggestions and giving feedback about what is good and bad in Vim.

Vim would never have become what it is now, without the help of these people!

        Ron Aaron               Win32 GUI changes
        Mohsin Ahmed            encryption
        Zoltan Arpadffy         work on VMS port
        Tony Andrews            Stevie
        Gert van Antwerpen      changes for DJGPP on MS-DOS
        Berkeley DB(3)          ideas for swap file implementation
        Keith Bostic            Nvi
        Walter Briscoe          Makefile updates, various patches
        Ralf Brown              SPAWNO library for MS-DOS
        Robert Colon            many useful remarks
        Marcin Dalecki          GTK+ GUI port, toolbar icons, gettext()
        Kayhan Demirel          sent me news in Uganda
        Chris & John Downey     xvi (ideas for multi-windows version)
        Henk Elbers             first VMS port
        Daniel Elstner          GTK+ 2 port
        Eric Fischer            Mac port, 'cindent', and other improvements
        Benji Fisher            Answering lots of user questions
        Bill Foster             Athena GUI port (later removed)
        Google                  Lets me work on Vim one day a week
        Loic Grenie             xvim (ideas for multi windows version)
        Sven Guckes             Vim promoter and previous WWW page maintainer
        Darren Hiebert          Exuberant ctags
        Jason Hildebrand        GTK+ 2 port
        Bruce Hunsaker          improvements for VMS port
        Andy Kahn               Cscope support, GTK+ GUI port
        Oezguer Kesim           Maintainer of Vim Mailing Lists
        Axel Kielhorn           work on the Macintosh port
        Steve Kirkendall        Elvis
        Roger Knobbe            original port to Windows NT
        Sergey Laskavy          Vim's help from Moscow
        Felix von Leitner       Previous maintainer of Vim Mailing Lists
        David Leonard           Port of Python extensions to Unix
        Avner Lottem            Edit in right-to-left windows
        Flemming Madsen         X11 client-server, various features and patches
        Tony Mechelynck         answers many user questions
        Paul Moore              Python interface extensions, many patches
        Katsuhito Nagano        Work on multibyte versions
        Sung-Hyun Nam           Work on multibyte versions
        Vince Negri             Win32 GUI and generic console enhancements
        Steve Oualline          Author of the first Vim book frombook
        Dominique Pelle         Valgrind reports and many fixes
        A.Politz                Many bug reports and some fixes
        George V. Reilly        Win32 port, Win32 GUI start-off
        Stephen Riehm           bug collector
        Stefan Roemer           various patches and help to users
        Ralf Schandl            IBM OS/390 port
        Olaf Seibert            DICE and BeBox version, regexp improvements
        Mortaza Shiran          Farsi patches
        Peter da Silva          termlib
        Paul Slootman           OS/2 port
        Henry Spencer           regular expressions
        Dany St-Amant           Macintosh port
        Tim Thompson            Stevie
        G. R. (Fred) Walter     Stevie
        Sven Verdoolaege        Perl interface
        Robert Webb             Command-line completion, GUI versions, and
                                lots of patches
        Ingo Wilken             Tcl interface
        Mike Williams           PostScript printing
        Juergen Weigert         Lattice version, AUX improvements, Unix and
                                MS-DOS ports, autoconf
        Stefan 'Sec' Zehl       Maintainer of vim.org
        Yasuhiro Matsumoto      many MS-Windows improvements
        Ken Takata              fixes and features
        Kazunobu Kuriyama       GTK 3
        Christian Brabandt      many fixes, features, user support, etc.
        Yegappan Lakshmanan     many quickfix features

I wish to thank all the people that sent me bug reports and suggestions.  The
list is too long to mention them all here.  Vim would not be the same without
the ideas from all these people: They keep Vim alive!
love peace friendship gross-national-happiness

Documentation may refer to other versions of Vi:
                                                        Vi vi
Vi      "the original".  Without further remarks this is the version
        of Vi that appeared in Sun OS 4.x.  ":version" returns
        "Version 3.7, 6/7/85".  Source code only available with a license.
Nvi     The "New" Vi.  The version of Vi that comes with BSD 4.4 and FreeBSD.
        Very good compatibility with the original Vi, with a few extensions.
        The version used is 1.79.  ":version" returns "Version 1.79
        (10/23/96)".  Source code is freely available.
Elvis   Another Vi clone, made by Steve Kirkendall.  Very compact but isn't
        as flexible as Vim.  Source code is freely available.

Vim     Nvim is based on Vim.  https://www.vim.org/

Notation                                                notation

When syntax highlighting is used to read this, text that is not typed
literally is often highlighted with the Special group.  These are items in [],
{} and <>, and CTRL-X.

Note that Vim uses all possible characters in commands.  Sometimes the [], {}
and <> are part of what you type, the context should make this clear.

[]              Characters in square brackets are optional.

                                                    count [count]
[count]         An optional number that may precede the command to multiply
                or iterate the command.  If no number is given, a count of one
                is used, unless otherwise noted.  Note that in this manual the
                [count] is not mentioned in the description of the command,
                but only in the explanation.  This was done to make the
                commands easier to look up.  If the 'showcmd' option is on,
                the (partially) entered count is shown at the bottom of the
                window.  You can use <Del> to erase the last digit (N<Del>).

["x]            An optional register designation where text can be stored.
                See registers.  The x is a single character between 'a' and
                'z' or 'A' and 'Z' or '"', and in some cases (with the put
                command) between '0' and '9', '%', '#', or others.  The
                uppercase and lowercase letter designate the same register,
                but the lowercase letter is used to overwrite the previous
                register contents, while the uppercase letter is used to
                append to the previous register contents.  Without the ""x" or
                with """" the stored text is put into the unnamed register.

{}              Curly braces denote parts of the command which must appear,
                but which can take a number of different values.  The
                differences between Vim and Vi are also given in curly braces
                (this will be clear from the context).

{char1-char2}   A single character from the range char1 to char2.  For
                example: {a-z} is a lowercase letter.  Multiple ranges may be
                concatenated.  For example, {a-zA-Z0-9} is any alphanumeric

                                                {motion} movement
{motion}        A command that moves the cursor.  These are explained in
                motion.txt.  Examples:
                        w               to start of next word
                        b               to begin of current word
                        4j              four lines down
                        /The<CR>        to next occurrence of "The"
                This is used after an operator command to move over the text
                that is to be operated upon.
                - If the motion includes a count and the operator also has a
                  count, the two counts are multiplied.  For example: "2d3w"
                  deletes six words.
                - The motion can be backwards, e.g. "db" to delete to the
                  start of the word.
                - The motion can also be a mouse click.  The mouse is not
                  supported in every terminal though.
                - The ":omap" command can be used to map characters while an
                  operator is pending.
                - Ex commands can be used to move the cursor.  This can be
                  used to call a function that does some complicated motion.
                  The motion is always charwise exclusive, no matter
                  what ":" command is used.  This means it's impossible to
                  include the last character of a line without the line break
                  (unless 'virtualedit' is set).
                  If the Ex command changes the text before where the operator
                  starts or jumps to another buffer the result is
                  unpredictable.  It is possible to change the text further
                  down.  Jumping to another buffer is possible if the current
                  buffer is not unloaded.

{Visual}        A selected text area.  It is started with the "v", "V", or
                CTRL-V command, then any cursor movement command can be used
                to change the end of the selected text.
                This is used before an operator command to highlight the
                text that is to be operated upon.
                See Visual-mode.

<character>     A special character from the table below, optionally with
                modifiers, or a single ASCII character with modifiers.

'c'             A single ASCII character.

CTRL-{char}     {char} typed as a control character; that is, typing {char}
                while holding the CTRL key down.  The case of {char} is
                ignored; thus CTRL-A and CTRL-a are equivalent.  But in
                some terminals and environments, using the SHIFT key will
                produce a distinct code (e.g. CTRL-SHIFT-a); in these
                environments using the SHIFT key will not trigger commands
                such as CTRL-A.

'option'        An option, or parameter, that can be set to a value, is
                enclosed in single quotes.  See options.

"command"       A reference to a command that you can type is enclosed in
                double quotes.
command       New style command, this distinguishes it from other quoted
                text and strings.

                                        key-notation key-codes keycodes
These names for keys are used in the documentation.  They can also be used
with the ":map" command.

notation        meaning             equivalent  decimal value(s)        
<Nul>           zero                    CTRL-@    0 (stored as 10) <Nul>
<BS>            backspace               CTRL-H    8     backspace
<Tab>           tab                     CTRL-I    9     tab Tab
<NL>            linefeed                CTRL-J   10 (used for <Nul>)
<CR>            carriage return         CTRL-M   13     carriage-return
<Return>        same as <CR>                            <Return>
<Enter>         same as <CR>                            <Enter>
<Esc>           escape                  CTRL-[   27     escape <Esc>
<Space>         space                            32     space
<lt>            less-than               <        60     <lt>
<Bslash>        backslash               \        92     backslash <Bslash>
<Bar>           vertical bar            |       124     <Bar>
<Del>           delete                          127
<CSI>           command sequence intro  ALT-Esc 155     <CSI>

<EOL>           end-of-line (can be <CR>, <NL> or <CR><NL>,
                depends on system and 'fileformat')     <EOL>
<Ignore>        cancel wait-for-character               <Ignore>
<NOP>           no-op: do nothing (useful in mappings)  <Nop>

<Up>            cursor-up                       cursor-up cursor_up
<Down>          cursor-down                     cursor-down cursor_down
<Left>          cursor-left                     cursor-left cursor_left
<Right>         cursor-right                    cursor-right cursor_right
<S-Up>          shift-cursor-up
<S-Down>        shift-cursor-down
<S-Left>        shift-cursor-left
<S-Right>       shift-cursor-right
<C-Left>        control-cursor-left
<C-Right>       control-cursor-right
<F1> - <F12>    function keys 1 to 12           function_key function-key
<S-F1> - <S-F12> shift-function keys 1 to 12    <S-F1>
<Help>          help key
<Undo>          undo key
<Insert>        insert key
<Home>          home                            home
<End>           end                             end
<PageUp>        page-up                         page_up page-up
<PageDown>      page-down                       page_down page-down
<kUp>           keypad cursor-up                keypad-cursor-up
<kDown>         keypad cursor-down              keypad-cursor-down
<kLeft>         keypad cursor-left              keypad-cursor-left
<kRight>        keypad cursor-right             keypad-cursor-right
<kHome>         keypad home (upper left)        keypad-home
<kEnd>          keypad end (lower left)         keypad-end
<kOrigin>       keypad origin (middle)          keypad-origin
<kPageUp>       keypad page-up (upper right)    keypad-page-up
<kPageDown>     keypad page-down (lower right)  keypad-page-down
<kDel>          keypad delete                   keypad-delete
<kPlus>         keypad +                        keypad-plus
<kMinus>        keypad -                        keypad-minus
<kMultiply>     keypad *                        keypad-multiply
<kDivide>       keypad /                        keypad-divide
<kPoint>        keypad .                        keypad-point
<kComma>        keypad ,                        keypad-comma
<kEqual>        keypad =                        keypad-equal
<kEnter>        keypad Enter                    keypad-enter
<k0> - <k9>     keypad 0 to 9                   keypad-0 keypad-9
<S-…>           shift-key                       shift <S-
<C-…>           control-key                     control ctrl <C-
<M-…>           alt-key or meta-key             META ALT <M-
<A->           same as <M-…>                   <A-
<D->           command-key or "super" key      <D-


- Availability of some keys (<Help>, <S-Right>, …) depends on the UI or host
- If numlock is on the TUI receives plain ASCII values, so mapping <k0>,
  <k1>, ..., <k9> and <kPoint> will not work.
- Nvim supports mapping multibyte chars with modifiers such as <M-ä>. Which
  combinations actually work depends on the the UI or host terminal.
- When a key is pressed using a meta or alt modifier and no mapping exists for
  that keypress, Nvim may behave as though <Esc> was pressed before the key.
- It is possible to notate combined modifiers (e.g. <C-A-T> for CTRL-ALT-T),
  but your terminal must encode the input for that to work. tui-input

Examples are often given in the <> notation.  Sometimes this is just to make
clear what you need to type, but often it can be typed literally, e.g., with
the ":map" command.  The rules are:
 1.  Printable characters are typed directly, except backslash and "<"
 2.  Backslash is represented with "\\", double backslash, or "<Bslash>".
 3.  Literal "<" is represented with "\<" or "<lt>".  When there is no
     confusion possible, "<" can be used directly.
 4.  "<key>" means the special key typed (see the table above).  Examples:
           <Esc>                Escape key
           <C-G>                CTRL-G
           <Up>                 cursor up key
           <C-LeftMouse>        Control- left mouse click
           <S-F11>              Shifted function key 11
           <M-a>                Meta- a  ('a' with bit 8 set)
           <M-A>                Meta- A  ('A' with bit 8 set)

The <> notation uses <lt> to escape the special meaning of key names.  Using a
backslash also works, but only when 'cpoptions' does not include the 'B' flag.

Examples for mapping CTRL-H to the six characters "<Home>": 
        :imap <C-H> \<Home>
        :imap <C-H> <lt>Home>
The first one only works when the 'B' flag is not in 'cpoptions'.  The second
one always works.
To get a literal "<lt>" in a mapping: 
        :map <C-L> <lt>lt>

The notation can be used in a double quoted strings, using "\<" at the start,
e.g. "\<C-Space>".  This results in a special key code.  To convert this back
to readable text use keytrans().

Modes, introduction                             vim-modes-intro vim-modes

Vim has seven BASIC modes:

                                        Normal Normal-mode command-mode
Normal mode             In Normal mode you can enter all the normal editor
                        commands.  If you start the editor you are in this
                        mode.  This is also known as command mode.

Visual mode             This is like Normal mode, but the movement commands
                        extend a highlighted area.  When a non-movement
                        command is used, it is executed for the highlighted
                        area.  See Visual-mode.
                        If the 'showmode' option is on "-- VISUAL --" is shown
                        at the bottom of the window.

Select mode             This looks most like the MS-Windows selection mode.
                        Typing a printable character deletes the selection
                        and starts Insert mode.  See Select-mode.
                        If the 'showmode' option is on "-- SELECT --" is shown
                        at the bottom of the window.

Insert mode             In Insert mode the text you type is inserted into the
                        buffer.  See Insert-mode.
                        If the 'showmode' option is on "-- INSERT --" is shown
                        at the bottom of the window.

Command-line mode       In Command-line mode (also called Cmdline mode) you
Cmdline mode            can enter one line of text at the bottom of the
                        window.  This is for the Ex commands, ":", the pattern
                        search commands, "?" and "/", and the filter command,
                        "!".  Cmdline-mode

Ex mode                 Like Command-line mode, but after entering a command
                        you remain in Ex mode.  Very limited editing of the
                        command line.  Ex-mode

Terminal mode           In Terminal mode all input (except CTRL-\) is sent to
                        the process running in the current terminal buffer.
                        If CTRL-\ is pressed, the next key is sent unless it
                        is CTRL-N (CTRL-\_CTRL-N) or CTRL-O (t_CTRL-\_CTRL-O).
                        If the 'showmode' option is on "-- TERMINAL --" is shown
                        at the bottom of the window.

There are six ADDITIONAL modes.  These are variants of the BASIC modes:

                                Operator-pending Operator-pending-mode
Operator-pending mode   This is like Normal mode, but after an operator
                        command has started, and Vim is waiting for a {motion}
                        to specify the text that the operator will work on.

Replace mode            Replace mode is a special case of Insert mode.  You
                        can do the same things as in Insert mode, but for
                        each character you enter, one character of the existing
                        text is deleted.  See Replace-mode.
                        If the 'showmode' option is on "-- REPLACE --" is
                        shown at the bottom of the window.

Virtual Replace mode    Virtual Replace mode is similar to Replace mode, but
                        instead of file characters you are replacing screen
                        real estate.  See Virtual-Replace-mode.
                        If the 'showmode' option is on "-- VREPLACE --" is
                        shown at the bottom of the window.

Insert Normal mode      Entered when CTRL-O is typed in Insert mode (see
                        i_CTRL-O).  This is like Normal mode, but after
                        executing one command Vim returns to Insert mode.
                        If the 'showmode' option is on "-- (insert) --" is
                        shown at the bottom of the window.

Insert Visual mode      Entered when starting a Visual selection from Insert
                        mode, e.g., by using CTRL-O and then "v", "V" or
                        CTRL-V.  When the Visual selection ends, Vim returns
                        to Insert mode.
                        If the 'showmode' option is on "-- (insert) VISUAL --"
                        is shown at the bottom of the window.

Insert Select mode      Entered when starting Select mode from Insert mode.
                        E.g., by dragging the mouse or <S-Right>.
                        When the Select mode ends, Vim returns to Insert mode.
                        If the 'showmode' option is on "-- (insert) SELECT --"
                        is shown at the bottom of the window.

Switching from mode to mode                             mode-switching

If for any reason you do not know which mode you are in, you can always get
back to Normal mode by typing <Esc> twice.  This doesn't work for Ex mode
though, use ":visual".
You will know you are back in Normal mode when you see the screen flash or
hear the bell after you type <Esc>.  However, when pressing <Esc> after using
CTRL-O in Insert mode you get a beep but you are still in Insert mode, type
<Esc> again.

                TO mode                                             
                Normal  Visual  Select  Insert    Replace   Cmd-line  Ex 
FROM mode                                                                
Normal                  v V ^V    *4     *1        R gR     : / ? !   Q
Visual           *2               ^G     c C        --        :       --
Select           *5     ^O ^G            *6         --        --      --
Insert           <Esc>    --      --              <Insert>    --      --
Replace          <Esc>    --      --    <Insert>              --      --
Command-line     *3       --      --     :start     --                --
Ex               :vi      --      --     --         --        --

-- not possible

* 1 Go from Normal mode to Insert mode by giving the command "i", "I", "a",
    "A", "o", "O", "c", "C", "s" or S".
* 2 Go from Visual mode to Normal mode by giving a non-movement command, which
    causes the command to be executed, or by hitting <Esc> "v", "V" or "CTRL-V"
    (see v_v), which just stops Visual mode without side effects.
* 3 Go from Command-line mode to Normal mode by:
    - Hitting <CR> or <NL>, which causes the entered command to be executed.
    - Deleting the complete line (e.g., with CTRL-U) and giving a final <BS>.
    - Hitting CTRL-C or <Esc>, which quits the command-line without executing
      the command.
    In the last case <Esc> may be the character defined with the 'wildchar'
    option, in which case it will start command-line completion.  You can
    ignore that and type <Esc> again.
* 4 Go from Normal to Select mode by:
    - use the mouse to select text while 'selectmode' contains "mouse"
    - use a non-printable command to move the cursor while keeping the Shift
      key pressed, and the 'selectmode' option contains "key"
    - use "v", "V" or "CTRL-V" while 'selectmode' contains "cmd"
    - use "gh", "gH" or "g CTRL-H"  g_CTRL-H
* 5 Go from Select mode to Normal mode by using a non-printable command to move
    the cursor, without keeping the Shift key pressed.
* 6 Go from Select mode to Insert mode by typing a printable character.  The
    selection is deleted and the character is inserted.

                        CTRL-\_CTRL-N i_CTRL-\_CTRL-N c_CTRL-\_CTRL-N
                                      v_CTRL-\_CTRL-N t_CTRL-\_CTRL-N
Additionally the command CTRL-\ CTRL-N or <C-\><C-N> can be used to go to
Normal mode from any other mode.  This can be used to make sure Vim is in
Normal mode, without causing a beep like <Esc> would.  However, this does not
work in Ex mode.  When used after a command that takes an argument, such as
f or m, the timeout set with 'ttimeoutlen' applies.

CTRL-\ CTRL-G works the same as CTRL-\_CTRL-N for backward compatibility.

                                gQ mode-Ex Ex-mode Ex EX E501
gQ                      Switch to Ex mode.  This is like typing ":" commands
                        one after another, except:
                        - You don't have to keep pressing ":".
                        - The screen doesn't get updated after each command.
                        Use the :vi command (:visual) to exit this mode.

Window contents                                         window-contents

In Normal mode and Insert/Replace mode the screen window will show the current
contents of the buffer: What You See Is What You Get.  There are two
- When the 'cpoptions' option contains '$', and the change is within one line,
  the text is not directly deleted, but a '$' is put at the last deleted
- When inserting text in one window, other windows on the same text are not
  updated until the insert is finished.

Lines longer than the window width will wrap, unless the 'wrap' option is off
(see below).  The 'linebreak' option can be set to wrap at a blank character.

If the window has room after the last line of the buffer, Vim will show '~' in
the first column of the last lines in the window, like this:

        |some line              |
        |last line              |
        |~                      |
        |~                      |

Thus the '~' lines indicate that the end of the buffer was reached.

If the last line in a window doesn't fit, Vim will indicate this with a '@' in
the first column of the last lines in the window, like this:

        |first line             |
        |second line            |
        |@                      |
        |@                      |

Thus the '@' lines indicate that there is a line that doesn't fit in the

When the "lastline" flag is present in the 'display' option, you will not see
'@' characters at the left side of window.  If the last line doesn't fit
completely, only the part that fits is shown, and the last three characters of
the last line are replaced with "@@@", like this:

        |first line             |
        |second line            |
        |a very long line that d|
        |oesn't fit in the wi@@@|

If there is a single line that is too long to fit in the window, this is a
special situation.  Vim will show only part of the line, around where the
cursor is.  There are no special characters shown, so that you can edit all
parts of this line.

The hl-NonText highlight group can be used to set special highlighting
for the '@' and '~' characters.  This makes it possible to distinguish them
from real characters in the buffer.

The 'showbreak' option contains the string to put in front of wrapped lines.

If the 'wrap' option is off, long lines will not wrap.  Only the part that
fits on the screen is shown.  If the cursor is moved to a part of the line
that is not shown, the screen is scrolled horizontally.  The advantage of
this method is that columns are shown as they are and lines that cannot fit
on the screen can be edited.  The disadvantage is that you cannot see all the
characters of a line at once.  The 'sidescroll' option can be set to the
minimal number of columns to scroll.

All normal ASCII characters are displayed directly on the screen.  The <Tab>
is replaced with the number of spaces that it represents.  Other non-printing
characters are replaced with "^{char}", where {char} is the non-printing
character with 64 added.  Thus character 7 (bell) will be shown as "^G".
Characters between 127 and 160 are replaced with "~{char}", where {char} is
the character with 64 subtracted.  These characters occupy more than one
position on the screen.  The cursor can only be positioned on the first one.

If you set the 'number' option, all lines will be preceded with their
number.  Tip: If you don't like wrapping lines to mix with the line numbers,
set the 'showbreak' option to eight spaces:
        ":set showbreak=\ \ \ \ \ \ \ \ "

If you set the 'list' option, <Tab> characters will not be shown as several
spaces, but as "^I".  A '$' will be placed at the end of the line, so you can
find trailing blanks.

In Command-line mode only the command-line itself is shown correctly.  The
display of the buffer contents is updated as soon as you go back to Command

The last line of the window is used for status and other messages.  The
status messages will only be used if an option is on:

status message                  option       default    Unix default    
current mode                    'showmode'      on          on
command characters              'showcmd'       on          off
cursor position                 'ruler'         off         off

The current mode is "-- INSERT --" or "-- REPLACE --", see 'showmode'.  The
command characters are those that you typed but were not used yet.

If you have a slow terminal you can switch off the status messages to speed
up editing:
        :set nosc noru nosm

If there is an error, an error message will be shown for at least one second
(in reverse video).

Some commands show how many lines were affected.  Above which threshold this
happens can be controlled with the 'report' option (default 2).

The name Vim and the full name of the current file name will be shown in the
title bar.  When the window is resized, Vim will automatically redraw the
window.  You may make the window as small as you like, but if it gets too
small not a single line will fit in it.  Make it at least 40 characters wide
to be able to read most messages on the last line.

Definitions                                             definitions jargon

  buffer                Contains lines of text, usually from a file.
  screen                The whole area that Nvim uses to display things.
  window                A view on a buffer.  There can be multiple windows for
                        one buffer.
  frame                 Windows are kept in a tree of frames.  Each frame
                        contains a column, row, or window ("leaf" frame).

A screen contains one or more windows, separated by status lines and with the
command line at the bottom.

screen  | window 1      | window 2      |
        |               |               |
        |               |               |
        |= status line =|= status line =|
        | window 3                      |
        |                               |
        |                               |
        |==== status line ==============|
        |command line                   |

The command line is also used for messages.  It scrolls up the screen when
there is not enough room in the command line.

A difference is made between four types of lines:

  buffer lines          The lines in the buffer.  This is the same as the
                        lines as they are read from/written to a file.  They
                        can be thousands of characters long.
  logical lines         The buffer lines with folding applied.  Buffer lines
                        in a closed fold are changed to a single logical line:
                        "+-- 99 lines folded".  They can be thousands of
                        characters long.
  window lines          The lines displayed in a window: A range of logical
                        lines with wrapping, line breaks, etc.  applied.  They
                        can only be as long as the width of the window allows,
                        longer lines are wrapped or truncated.
  screen lines          The lines of the screen that Nvim uses.  Consists of
                        the window lines of all windows, with status lines
                        and the command line added.  They can only be as long
                        as the width of the screen allows.  When the command
                        line gets longer it wraps and lines are scrolled to
                        make room.

buffer lines    logical lines   window lines    screen lines 

1. one          1. one          1. +-- folded   1.  +-- folded
2. two          2. +-- folded   2. five         2.  five
3. three        3. five         3. six          3.  six
4. four         4. six          4. seven        4.  seven
5. five         5. seven                        5.  === status line ===
6. six                                          6.  aaa
7. seven                                        7.  bbb
                                                8.  ccc ccc c
1. aaa          1. aaa          1. aaa          9.  cc
2. bbb          2. bbb          2. bbb          10. ddd
3. ccc ccc ccc  3. ccc ccc ccc  3. ccc ccc c    11. ~ 
4. ddd          4. ddd          4. cc           12. === status line ===
                                5. ddd          13. (command line)
                                6. ~ 

API client 
All external UIs and remote plugins (as opposed to regular Vim plugins) are
"clients" in general; but we call something an "API client" if its purpose is
to abstract or wrap the RPC API for the convenience of other applications
(just like a REST client or SDK such as boto3 for AWS: you can speak AWS REST
using an HTTP client like curl, but boto3 wraps that in a convenient python
interface). For example, the Nvim lua-client is an API client:

A plugin "host" is both a client (of the Nvim API) and a server (of an
external platform, e.g. python). It is a remote plugin that hosts other

Remote plugin 
Arbitrary code registered via :UpdateRemotePlugins, that runs in a separate
process and communicates with Nvim via the api.


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