neovim/runtime/doc/api.txt

*api.txt*		Nvim


		 NVIM REFERENCE MANUAL    by Thiago de Arruda


Nvim API							   *API* *api*

Nvim exposes a powerful API that can be used by plugins and external processes
via |RPC|, |Lua| and VimL (|eval-api|).

Applications can also embed libnvim to work with the C API directly.

                                      Type |gO| to see the table of contents.

==============================================================================
API Types							   *api-types*

The Nvim C API defines custom types for all function parameters. Some are just
typedefs around C99 standard types, others are Nvim-defined data structures.

  Boolean				-> bool
  Integer (signed 64-bit integer)	-> int64_t
  Float (IEEE 754 double precision)	-> double
  String				-> {char* data, size_t size} struct
  Array
  Dictionary
  Object

The following handle types are defined as integer typedefs, but are
discriminated as separate types in an Object:

  Buffer				-> enum value kObjectTypeBuffer
  Window				-> enum value kObjectTypeWindow
  Tabpage				-> enum value kObjectTypeTabpage

==============================================================================
API metadata							 *api-metadata*

Nvim exposes API metadata as a Dictionary. Some items are described below:

version			Nvim version, API level/compatibility
version.api_level	Current API level
version.api_compatible	API is backwards-compatible with this level
version.api_prerelease	Declares the current API level as unstable >
			(version.api_prerelease && fn.since == version.api_level)
functions		API function signatures
ui_events		UI event signatures |ui|
ui_options		Supported |ui-options|
{fn}.since		API level where function {fn} was introduced
{fn}.deprecated_since	API level where function {fn} was deprecated
types			Custom handle types defined by Nvim
error_types		Possible error types returned by API functions

External programs ("clients") can use the metadata to discover the |rpc-api|.

==============================================================================
API contract                                                     *api-contract*

The Nvim API is composed of functions and events.

- Clients call functions like those described at |api-global|.
- Clients can subscribe to |ui-events|, |api-buffer-updates|, etc.
- API function names are prefixed with "nvim_".
- API event names are prefixed with "nvim_" and suffixed with "_event".

As Nvim evolves the API may change in compliance with this CONTRACT:

- New functions and events may be added.
  - Any such extensions are OPTIONAL: old clients may ignore them.
- Function signatures will NOT CHANGE (after release).
  - Functions introduced in the development (unreleased) version MAY CHANGE.
    (Clients can dynamically check `api_prerelease`, etc. |api-metadata|)
- Event parameters will not be removed or reordered (after release).
- Events may be EXTENDED: new parameters may be added.
- New items may be ADDED to map/list parameters/results of functions and
  events.
  - Any such new items are OPTIONAL: old clients may ignore them.
  - Existing items will not be removed (after release).
- Deprecated functions will not be removed until Nvim version 2.0

==============================================================================
Global events						    *api-global-events*

When a client invokes an API request as an async notification, it is not
possible for Nvim to send an error response. Instead, in case of error, the
following notification will be sent to the client:

                                                             *nvim_error_event*
nvim_error_event[{type}, {message}]

{type} is a numeric id as defined by `api_info().error_types`, and {message} is
a string with the error message.

==============================================================================
Buffer update events					*api-buffer-updates*

API clients can "attach" to Nvim buffers to subscribe to buffer update events.
This is similar to |TextChanged| but more powerful and granular.

Call |nvim_buf_attach()| to receive these events on the channel:

                                                        *nvim_buf_lines_event*
nvim_buf_lines_event[{buf}, {changedtick}, {firstline}, {lastline}, {linedata}, {more}]

  When the buffer text between {firstline} and {lastline} (end-exclusive,
  zero-indexed) were changed to the new text in the {linedata} list. The
  granularity is a line, i.e. if a single character is changed in the editor,
  the entire line is sent.

  When {changedtick} is |v:null| this means the screen lines (display) changed
  but not the buffer contents. {linedata} contains the changed screen lines.
  This happens when 'inccommand' shows a buffer preview.

  Properties:~
    {buf} API buffer handle (buffer number)

    {changedtick} value of |b:changedtick| for the buffer. If you send an API
    command back to nvim you can check the value of |b:changedtick| as part of
    your request to ensure that no other changes have been made.

    {firstline} integer line number of the first line that was replaced.
    Zero-indexed: if line 1 was replaced then {firstline} will be 0, not 1.
    {firstline} is always less than or equal to the number of lines that were
    in the buffer before the lines were replaced.

    {lastline} integer line number of the first line that was not replaced
    (i.e. the range {firstline}, {lastline} is end-exclusive).
    Zero-indexed: if line numbers 2 to 5 were replaced, this will be 5 instead
    of 6. {lastline} is always be less than or equal to the number of lines
    that were in the buffer before the lines were replaced. {lastline} will be
    -1 if the event is part of the initial update after attaching.

    {linedata} list of strings containing the contents of the new buffer
    lines. Newline characters are omitted; empty lines are sent as empty
    strings.

    {more} boolean, true for a "multipart" change notification: the current
    change was chunked into multiple |nvim_buf_lines_event| notifications
    (e.g. because it was too big).

nvim_buf_changedtick_event[{buf}, {changedtick}]  *nvim_buf_changedtick_event*

  When |b:changedtick| was incremented but no text was changed. Relevant for
  undo/redo.

  Properties:~
    {buf} API buffer handle (buffer number)
    {changedtick} new value of |b:changedtick| for the buffer

nvim_buf_detach_event[{buf}]                           *nvim_buf_detach_event*

  When buffer is detached (i.e. updates are disabled). Triggered explicitly by
  |nvim_buf_detach()| or implicitly in these cases:
  - Buffer was |abandon|ed and 'hidden' is not set.
  - Buffer was reloaded, e.g. with |:edit| or an external change triggered
    |:checktime| or 'autoread'.
  - Generally: whenever the buffer contents are unloaded from memory.

  Properties:~
    {buf} API buffer handle (buffer number)


EXAMPLE ~

Calling |nvim_buf_attach()| with send_buffer=true on an empty buffer, emits: >
  nvim_buf_lines_event[{buf}, {changedtick}, 0, 0, [""], v:false]

User adds two lines to the buffer, emits: >
  nvim_buf_lines_event[{buf}, {changedtick}, 0, 0, ["line1", "line2"], v:false]

User moves to a line containing the text "Hello world" and inserts "!", emits: >
  nvim_buf_lines_event[{buf}, {changedtick}, {linenr}, {linenr} + 1,
                       ["Hello world!"], v:false]

User moves to line 3 and deletes 20 lines using "20dd", emits: >
  nvim_buf_lines_event[{buf}, {changedtick}, 2, 22, [], v:false]

User selects lines 3-5 using |linewise-visual| mode and then types "p" to
paste a block of 6 lines, emits: >
  nvim_buf_lines_event[{buf}, {changedtick}, 2, 5,
    ['pasted line 1', 'pasted line 2', 'pasted line 3', 'pasted line 4',
     'pasted line 5', 'pasted line 6'],
    v:false
  ]

User reloads the buffer with ":edit", emits: >
  nvim_buf_detach_event[{buf}]

==============================================================================
Buffer highlighting					       *api-highlights*

Nvim allows plugins to add position-based highlights to buffers. This is
similar to |matchaddpos()| but with some key differences. The added highlights
are associated with a buffer and adapts to line insertions and deletions,
similar to signs. It is also possible to manage a set of highlights as a group
and delete or replace all at once.

The intended use case are linter or semantic highlighter plugins that monitor
a buffer for changes, and in the background compute highlights to the buffer.
Another use case are plugins that show output in an append-only buffer, and
want to add highlights to the outputs. Highlight data cannot be preserved
on writing and loading a buffer to file, nor in undo/redo cycles.

Highlights are registered using the |nvim_buf_add_highlight()| function. If an
external highlighter plugin wants to add many highlights in a batch,
performance can be improved by calling |nvim_buf_add_highlight()| as an
asynchronous notification, after first (synchronously) reqesting a source id.
Example using the Nvim python-client:
>
    src = vim.new_highlight_source()

    buf = vim.current.buffer
    for i in range(5):
        buf.add_highlight("String",i,0,-1,src_id=src)

    # some time later

    buf.clear_highlight(src)
<
If the highlights don't need to be deleted or updated, just pass -1 as
src_id (this is the default in python). Use |nvim_buf_clear_namespace()| to
clear highlights from a specific source, in a specific line range or the
entire buffer by passing in the line range 0, -1 (the latter is the default in
python as used above).

An example of calling the api from vimscript: >

    call nvim_buf_set_lines(0, 0, 0, v:true, ["test text"])
    let src = nvim_buf_add_highlight(0, 0, "String", 1, 0, 4)
    call nvim_buf_add_highlight(0, src, "Identifier", 0, 5, -1)

    " later
    call nvim_buf_clear_namespace(0, src, 0, -1)
>
==============================================================================
Global Functions                                                  *api-global*

nvim_command({command})                                       *nvim_command()*
                Executes an ex-command.

                On execution error: fails with VimL error, does not update
                v:errmsg.

                Parameters: ~
                    {command}  Ex-command string

nvim_get_hl_by_name({name}, {rgb})                     *nvim_get_hl_by_name()*
                Gets a highlight definition by name.

                Parameters: ~
                    {name}  Highlight group name
                    {rgb}   Export RGB colors

                Return: ~
                    Highlight definition map

nvim_get_hl_by_id({hl_id}, {rgb})                        *nvim_get_hl_by_id()*
                Gets a highlight definition by id. |hlID()|

                Parameters: ~
                    {hl_id}  Highlight id as returned by |hlID()|
                    {rgb}    Export RGB colors

                Return: ~
                    Highlight definition map

nvim_feedkeys({keys}, {mode}, {escape_csi})                  *nvim_feedkeys()*
                Sends input-keys to Nvim, subject to various quirks controlled
                by `mode` flags. This is a blocking call, unlike
                |nvim_input()|.

                On execution error: does not fail, but updates v:errmsg.

                Parameters: ~
                    {keys}        to be typed
                    {mode}        behavior flags, see |feedkeys()|
                    {escape_csi}  If true, escape K_SPECIAL/CSI bytes in
                                  `keys`

nvim_input({keys})                                              *nvim_input()*
                Queues raw user-input. Unlike |nvim_feedkeys()|, this uses a
                low-level input buffer and the call is non-blocking (input is
                processed asynchronously by the eventloop).

                On execution error: does not fail, but updates v:errmsg.

                Note:
                    |keycodes| like <CR> are translated, so "<" is special. To
                    input a literal "<", send <LT>.

                Attributes: ~
                    {async}

                Parameters: ~
                    {keys}  to be typed

                Return: ~
                    Number of bytes actually written (can be fewer than
                    requested if the buffer becomes full).

                                                    *nvim_replace_termcodes()*
nvim_replace_termcodes({str}, {from_part}, {do_lt}, {special})
                Replaces terminal codes and |keycodes| (<CR>, <Esc>, ...) in a
                string with the internal representation.

                Parameters: ~
                    {str}        String to be converted.
                    {from_part}  Legacy Vim parameter. Usually true.
                    {do_lt}      Also translate <lt>. Ignored if `special` is
                                 false.
                    {special}    Replace |keycodes|, e.g. <CR> becomes a "\n"
                                 char.

nvim_command_output({command})                         *nvim_command_output()*
                Executes an ex-command and returns its (non-error) output.
                Shell |:!| output is not captured.

                On execution error: fails with VimL error, does not update
                v:errmsg.

                Parameters: ~
                    {command}  Ex-command string

nvim_eval({expr})                                                *nvim_eval()*
                Evaluates a VimL expression (:help expression). Dictionaries
                and Lists are recursively expanded.

                On execution error: fails with VimL error, does not update
                v:errmsg.

                Parameters: ~
                    {expr}  VimL expression string

                Return: ~
                    Evaluation result or expanded object

nvim_execute_lua({code}, {args})                          *nvim_execute_lua()*
                Execute lua code. Parameters (if any) are available as `...`
                inside the chunk. The chunk can return a value.

                Only statements are executed. To evaluate an expression,
                prefix it with `return`: return my_function(...)

                Parameters: ~
                    {code}  lua code to execute
                    {args}  Arguments to the code

                Return: ~
                    Return value of lua code if present or NIL.

nvim_call_function({fn}, {args})                        *nvim_call_function()*
                Calls a VimL function with the given arguments.

                On execution error: fails with VimL error, does not update
                v:errmsg.

                Parameters: ~
                    {fn}    Function to call
                    {args}  Function arguments packed in an Array

                Return: ~
                    Result of the function call

nvim_call_dict_function({dict}, {fn}, {args})      *nvim_call_dict_function()*
                Calls a VimL |Dictionary-function| with the given arguments.

                On execution error: fails with VimL error, does not update
                v:errmsg.

                Parameters: ~
                    {dict}  Dictionary, or String evaluating to a VimL |self|
                            dict
                    {fn}    Name of the function defined on the VimL dict
                    {args}  Function arguments packed in an Array

                Return: ~
                    Result of the function call

nvim_strwidth({text})                                        *nvim_strwidth()*
                Calculates the number of display cells occupied by `text`.
                <Tab> counts as one cell.

                Parameters: ~
                    {text}  Some text

                Return: ~
                    Number of cells

nvim_list_runtime_paths()                          *nvim_list_runtime_paths()*
                Gets the paths contained in 'runtimepath'.

                Return: ~
                    List of paths

nvim_set_current_dir({dir})                           *nvim_set_current_dir()*
                Changes the global working directory.

                Parameters: ~
                    {dir}  Directory path

nvim_get_current_line()                              *nvim_get_current_line()*
                Gets the current line

                Parameters: ~

                Return: ~
                    Current line string

nvim_set_current_line({line})                        *nvim_set_current_line()*
                Sets the current line

                Parameters: ~
                    {line}  Line contents

nvim_del_current_line()                              *nvim_del_current_line()*
                Deletes the current line

                Parameters: ~

nvim_get_var({name})                                          *nvim_get_var()*
                Gets a global (g:) variable

                Parameters: ~
                    {name}  Variable name

                Return: ~
                    Variable value

nvim_set_var({name}, {value})                                 *nvim_set_var()*
                Sets a global (g:) variable

                Parameters: ~
                    {name}   Variable name
                    {value}  Variable value

nvim_del_var({name})                                          *nvim_del_var()*
                Removes a global (g:) variable

                Parameters: ~
                    {name}  Variable name

nvim_get_vvar({name})                                        *nvim_get_vvar()*
                Gets a v: variable

                Parameters: ~
                    {name}  Variable name

                Return: ~
                    Variable value

nvim_get_option({name})                                    *nvim_get_option()*
                Gets an option value string

                Parameters: ~
                    {name}  Option name

                Return: ~
                    Option value (global)

nvim_set_option({name}, {value})                           *nvim_set_option()*
                Sets an option value

                Parameters: ~
                    {name}   Option name
                    {value}  New option value

nvim_out_write({str})                                       *nvim_out_write()*
                Writes a message to the Vim output buffer. Does not append
                "\n", the message is buffered (won't display) until a linefeed
                is written.

                Parameters: ~
                    {str}  Message

nvim_err_write({str})                                       *nvim_err_write()*
                Writes a message to the Vim error buffer. Does not append
                "\n", the message is buffered (won't display) until a linefeed
                is written.

                Parameters: ~
                    {str}  Message

nvim_err_writeln({str})                                   *nvim_err_writeln()*
                Writes a message to the Vim error buffer. Appends "\n", so the
                buffer is flushed (and displayed).

                Parameters: ~
                    {str}  Message

nvim_list_bufs()                                            *nvim_list_bufs()*
                Gets the current list of buffer handles

                Includes unlisted (unloaded/deleted) buffers, like `:ls!`. Use
                |nvim_buf_is_loaded()| to check if a buffer is loaded.

                Return: ~
                    List of buffer handles

nvim_get_current_buf()                                *nvim_get_current_buf()*
                Gets the current buffer

                Return: ~
                    Buffer handle

nvim_set_current_buf({buffer})                        *nvim_set_current_buf()*
                Sets the current buffer

                Parameters: ~
                    {buffer}  Buffer handle

nvim_list_wins()                                            *nvim_list_wins()*
                Gets the current list of window handles

                Return: ~
                    List of window handles

nvim_get_current_win()                                *nvim_get_current_win()*
                Gets the current window

                Return: ~
                    Window handle

nvim_set_current_win({window})                        *nvim_set_current_win()*
                Sets the current window

                Parameters: ~
                    {window}  Window handle

nvim_list_tabpages()                                    *nvim_list_tabpages()*
                Gets the current list of tabpage handles

                Return: ~
                    List of tabpage handles

nvim_get_current_tabpage()                        *nvim_get_current_tabpage()*
                Gets the current tabpage

                Return: ~
                    Tabpage handle

nvim_set_current_tabpage({tabpage})               *nvim_set_current_tabpage()*
                Sets the current tabpage

                Parameters: ~
                    {tabpage}  Tabpage handle

nvim_create_namespace({name})                        *nvim_create_namespace()*
                create a new namespace, or get one with an exisiting name

                Namespaces are currently used for buffer highlighting and
                virtual text, see |nvim_buf_add_highlight| and
                |nvim_buf_set_virtual_text|.

                Namespaces can have a name of be anonymous. If `name` is a
                non-empty string, and a namespace already exists with that
                name,the existing namespace id is returned. If an empty string
                is used, a new anonymous namespace is returned.

                Parameters: ~
                    {name}  Name of the namespace or empty string

                Return: ~
                    the namespace id

nvim_get_namespaces()                                  *nvim_get_namespaces()*
                Get existing named namespaces

                Return: ~
                    dict that maps from names to namespace ids.

nvim_subscribe({event})                                     *nvim_subscribe()*
                Subscribes to event broadcasts

                Parameters: ~
                    {event}  Event type string

nvim_unsubscribe({event})                                 *nvim_unsubscribe()*
                Unsubscribes to event broadcasts

                Parameters: ~
                    {event}  Event type string

nvim_get_color_by_name({name})                      *nvim_get_color_by_name()*
                TODO: Documentation

nvim_get_color_map()                                    *nvim_get_color_map()*
                TODO: Documentation

nvim_get_mode()                                              *nvim_get_mode()*
                Gets the current mode. |mode()| "blocking" is true if Nvim is
                waiting for input.

                Return: ~
                    Dictionary { "mode": String, "blocking": Boolean }

                Attributes: ~
                    {async}

nvim_get_keymap({mode})                                    *nvim_get_keymap()*
                Gets a list of global (non-buffer-local) |mapping|
                definitions.

                Parameters: ~
                    {mode}  Mode short-name ("n", "i", "v", ...)

                Return: ~
                    Array of maparg()-like dictionaries describing mappings.
                    The "buffer" key is always zero.

nvim_get_commands({opts})                                *nvim_get_commands()*
                Gets a map of global (non-buffer-local) Ex commands.

                Currently only |user-commands| are supported, not builtin Ex
                commands.

                Parameters: ~
                    {opts}  Optional parameters. Currently only supports
                            {"builtin":false}

                Return: ~
                    Map of maps describing commands.

nvim_get_api_info()                                      *nvim_get_api_info()*
                Returns a 2-tuple (Array), where item 0 is the current channel
                id and item 1 is the |api-metadata| map (Dictionary).

                Return: ~
                    2-tuple [{channel-id}, {api-metadata}]

                Attributes: ~
                    {async}

                                                      *nvim_set_client_info()*
nvim_set_client_info({name}, {version}, {type}, {methods},
                     {attributes})
                Identify the client for nvim. Can be called more than once,
                but subsequent calls will remove earlier info, which should be
                resent if it is still valid. (This could happen if a library
                first identifies the channel, and a plugin using that library
                later overrides that info)

                Parameters: ~
                    {name}        short name for the connected client
                    {version}     Dictionary describing the version, with the
                                  following possible keys (all optional)
                                  "major" major version (defaults to 0 if not
                                  set, for no release yet)  "minor" minor
                                  version  "patch" patch number  "prerelease"
                                  string describing a prerelease, like "dev"
                                  or "beta1"  "commit" hash or similar
                                  identifier of commit
                    {type}        Must be one of the following values. A
                                  client library should use "remote" if the
                                  library user hasn't specified other value.
                                  "remote" remote client that connected to
                                  nvim.  "ui" gui frontend  "embedder"
                                  application using nvim as a component, for
                                  instance IDE/editor implementing a vim mode.
                                  "host" plugin host, typically started by
                                  nvim  "plugin" single plugin, started by
                                  nvim
                    {methods}     Builtin methods in the client. For a host,
                                  this does not include plugin methods which
                                  will be discovered later. The key should be
                                  the method name, the values are dicts with
                                  the following (optional) keys:   "async" if
                                  true, send as a notification. If false or
                                  unspecified, use a blocking request  "nargs"
                                  Number of arguments. Could be a single
                                  integer or an array two integers, minimum
                                  and maximum inclusive. Further keys might be
                                  added in later versions of nvim and unknown
                                  keys are thus ignored. Clients must only use
                                  keys defined in this or later versions of
                                  nvim!
                    {attributes}  Informal attributes describing the client.
                                  Clients might define their own keys, but the
                                  following are suggested:   "website" Website
                                  of client (for instance github repository)
                                  "license" Informal description of the
                                  license, such as "Apache 2", "GPLv3" or
                                  "MIT"  "logo" URI or path to image,
                                  preferably small logo or icon. .png or .svg
                                  format is preferred.

nvim_get_chan_info({chan})                              *nvim_get_chan_info()*
                Get information about a channel.

                Return: ~
                    a Dictionary, describing a channel with the following
                    keys:   "stream" the stream underlying the channel
                    "stdio" stdin and stdout of this Nvim instance  "stderr"
                    stderr of this Nvim instance  "socket" TCP/IP socket or
                    named pipe  "job" job with communication over its stdio

                  "mode" how data received on the channel is interpreted   "bytes" send and recieve raw bytes  "terminal" a |terminal| instance interprets ASCII sequences  "rpc" |RPC| communication on the channel is active  "pty" Name of pseudoterminal, if one is used (optional). On a POSIX system, this will be a device path like /dev/pts/1. Even if the name is unknown, the key will still be present to indicate a pty is used. This is currently the case when using winpty on windows.  "buffer" buffer with connected |terminal| instance (optional)  "client" information about the client on the other end of the RPC channel, if it has added it using |nvim_set_client_info()|. (optional)

nvim_list_chans()                                          *nvim_list_chans()*
                Get information about all open channels.

                Return: ~
                    Array of Dictionaries, each describing a channel with the
                    format specified at |nvim_get_chan_info()|.

nvim_call_atomic({calls})                                 *nvim_call_atomic()*
                Calls many API methods atomically.

                This has two main usages:
                  To perform several requests from an async context atomically, i.e. without interleaving redraws, RPC requests from other clients, or user interactions (however API methods may trigger autocommands or event processing which have such side-effects, e.g. |:sleep| may wake timers).  To minimize RPC overhead (roundtrips) of a sequence of many requests.

                Parameters: ~
                    {calls}  an array of calls, where each call is described
                             by an array with two elements: the request name,
                             and an array of arguments.

                Return: ~
                    an array with two elements. The first is an array of
                    return values. The second is NIL if all calls succeeded.
                    If a call resulted in an error, it is a three-element
                    array with the zero-based index of the call which resulted
                    in an error, the error type and the error message. If an
                    error occurred, the values from all preceding calls will
                    still be returned.

                                                     *nvim_parse_expression()*
nvim_parse_expression({expr}, {flags}, {highlight})
                Parse a VimL expression

                Attributes: ~
                    {async}

                Parameters: ~
                    {expr}       Expression to parse. Is always treated as a
                                 single line.
                    {flags}      Flags:  - "m" if multiple expressions in a
                                 row are allowed (only the first one will be
                                 parsed), - "E" if EOC tokens are not allowed
                                 (determines whether they will stop parsing
                                 process or be recognized as an
                                 operator/space, though also yielding an
                                 error). - "l" when needing to start parsing
                                 with lvalues for ":let" or ":for". Common
                                 flag sets: - "m" to parse like for ":echo". -
                                 "E" to parse like for "<C-r>=". - empty
                                 string for ":call". - "lm" to parse for
                                 ":let".
                    {highlight}  If true, return value will also include
                                 "highlight" key containing array of 4-tuples
                                 (arrays) (Integer, Integer, Integer, String),
                                 where first three numbers define the
                                 highlighted region and represent line,
                                 starting column and ending column (latter
                                 exclusive: one should highlight region
                                 [start_col, end_col)).

                Return: ~
                    AST: top-level dictionary with these keys: "error":
                    Dictionary with error, present only if parser saw some
                    error. Contains the following keys: "message": String,
                    error message in printf format, translated. Must contain
                    exactly one "%.*s". "arg": String, error message argument.
                    "len": Amount of bytes successfully parsed. With flags
                    equal to "" that should be equal to the length of expr
                    string. @note: “Sucessfully parsed” here means
                    “participated in AST creation”, not “till the first
                    error”. "ast": AST, either nil or a dictionary with these
                    keys: "type": node type, one of the value names from
                    ExprASTNodeType stringified without "kExprNode" prefix.
                    "start": a pair [line, column] describing where node is
                    “started” where "line" is always 0 (will not be 0 if you
                    will be using nvim_parse_viml() on e.g. ":let", but that
                    is not present yet). Both elements are Integers. "len":
                    “length” of the node. This and "start" are there for
                    debugging purposes primary (debugging parser and providing
                    debug information). "children": a list of nodes described
                    in top/"ast". There always is zero, one or two children,
                    key will not be present if node has no children. Maximum
                    number of children may be found in node_maxchildren array.
                    Local values (present only for certain nodes): "scope": a
                    single Integer, specifies scope for "Option" and
                    "PlainIdentifier" nodes. For "Option" it is one of
                    ExprOptScope values, for "PlainIdentifier" it is one of
                    ExprVarScope values. "ident": identifier (without scope,
                    if any), present for "Option", "PlainIdentifier",
                    "PlainKey" and "Environment" nodes. "name": Integer,
                    register name (one character) or -1. Only present for
                    "Register" nodes. "cmp_type": String, comparison type, one
                    of the value names from ExprComparisonType, stringified
                    without "kExprCmp" prefix. Only present for "Comparison"
                    nodes. "ccs_strategy": String, case comparison strategy,
                    one of the value names from ExprCaseCompareStrategy,
                    stringified without "kCCStrategy" prefix. Only present for
                    "Comparison" nodes. "augmentation": String, augmentation
                    type for "Assignment" nodes. Is either an empty string,
                    "Add", "Subtract" or "Concat" for "=", "+=", "-=" or ".="
                    respectively. "invert": Boolean, true if result of
                    comparison needs to be inverted. Only present for
                    "Comparison" nodes. "ivalue": Integer, integer value for
                    "Integer" nodes. "fvalue": Float, floating-point value for
                    "Float" nodes. "svalue": String, value for
                    "SingleQuotedString" and "DoubleQuotedString" nodes.

nvim__id({obj})                                                   *nvim__id()*
                Returns object given as argument

                This API function is used for testing. One should not rely on
                its presence in plugins.

                Parameters: ~
                    {obj}  Object to return.

                Return: ~
                    its argument.

nvim__id_array({arr})                                       *nvim__id_array()*
                Returns array given as argument

                This API function is used for testing. One should not rely on
                its presence in plugins.

                Parameters: ~
                    {arr}  Array to return.

                Return: ~
                    its argument.

nvim__id_dictionary({dct})                             *nvim__id_dictionary()*
                Returns dictionary given as argument

                This API function is used for testing. One should not rely on
                its presence in plugins.

                Parameters: ~
                    {dct}  Dictionary to return.

                Return: ~
                    its argument.

nvim__id_float({flt})                                       *nvim__id_float()*
                Returns floating-point value given as argument

                This API function is used for testing. One should not rely on
                its presence in plugins.

                Parameters: ~
                    {flt}  Value to return.

                Return: ~
                    its argument.

nvim__stats()                                                  *nvim__stats()*
                Gets internal stats.

                Return: ~
                    Map of various internal stats.

nvim_list_uis()                                              *nvim_list_uis()*
                Gets a list of dictionaries representing attached UIs.

                Return: ~
                    Array of UI dictionaries
                Each dictionary has the following keys:
                  "height" requested height of the UI  "width" requested width of the UI  "rgb" whether the UI uses rgb colors (false implies cterm colors)  "ext_..." Requested UI extensions, see |ui-options|  "chan" Channel id of remote UI (not present for TUI)

nvim_get_proc_children({pid})                       *nvim_get_proc_children()*
                Gets the immediate children of process `pid`.

                Return: ~
                    Array of child process ids, empty if process not found.

nvim_get_proc({pid})                                         *nvim_get_proc()*
                Gets info describing process `pid`.

                Return: ~
                    Map of process properties, or NIL if process not found.

nvim__inspect_cell({row}, {col})                        *nvim__inspect_cell()*
                TODO: Documentation


==============================================================================
Buffer Functions                                                  *api-buffer*

Unloaded Buffers:~

Buffers may be unloaded by the |:bunload| command or the
buffer's |'bufhidden'| option. When a buffer is unloaded its
file contents are freed from memory and vim cannot operate on
the buffer lines until it is reloaded (usually by opening the
buffer again in a new window). API methods such as
|nvim_buf_get_lines()| and |nvim_buf_line_count()| will be
affected.

You can use |nvim_buf_is_loaded()| or |nvim_buf_line_count()|
to check whether a buffer is loaded.

nvim_buf_line_count({buffer})                          *nvim_buf_line_count()*
                Gets the buffer line count

                Parameters: ~
                    {buffer}  Buffer handle

                Return: ~
                    Line count, or 0 for unloaded buffer. |api-buffer|

nvim_buf_attach({buffer}, {send_buffer}, {opts})           *nvim_buf_attach()*
                Activate updates from this buffer to the current channel.

                Parameters: ~
                    {buffer}       The buffer handle
                    {send_buffer}  Set to true if the initial notification
                                   should contain the whole buffer. If so, the
                                   first notification will be a
                                   `nvim_buf_lines_event`. Otherwise, the
                                   first notification will be a
                                   `nvim_buf_changedtick_event`
                    {opts}         Optional parameters. Currently not used.

                Return: ~
                    False when updates couldn't be enabled because the buffer
                    isn't loaded or optscontained an invalid key; otherwise
                    True.

nvim_buf_detach({buffer})                                  *nvim_buf_detach()*
                Deactivate updates from this buffer to the current channel.

                Parameters: ~
                    {buffer}  The buffer handle

                Return: ~
                    False when updates couldn't be disabled because the buffer
                    isn't loaded; otherwise True.

                                                        *nvim_buf_get_lines()*
nvim_buf_get_lines({buffer}, {start}, {end}, {strict_indexing})
                Gets a line-range from the buffer.

                Indexing is zero-based, end-exclusive. Negative indices are
                interpreted as length+1+index: -1 refers to the index past the
                end. So to get the last element use start=-2 and end=-1.

                Out-of-bounds indices are clamped to the nearest valid value,
                unless `strict_indexing` is set.

                Parameters: ~
                    {buffer}           Buffer handle
                    {start}            First line index
                    {end}              Last line index (exclusive)
                    {strict_indexing}  Whether out-of-bounds should be an
                                       error.

                Return: ~
                    Array of lines, or empty array for unloaded buffer.

                                                        *nvim_buf_set_lines()*
nvim_buf_set_lines({buffer}, {start}, {end}, {strict_indexing},
                   {replacement})
                Sets (replaces) a line-range in the buffer.

                Indexing is zero-based, end-exclusive. Negative indices are
                interpreted as length+1+index: -1 refers to the index past the
                end. So to change or delete the last element use start=-2 and
                end=-1.

                To insert lines at a given index, set `start` and `end` to the
                same index. To delete a range of lines, set `replacement` to
                an empty array.

                Out-of-bounds indices are clamped to the nearest valid value,
                unless `strict_indexing` is set.

                Parameters: ~
                    {buffer}           Buffer handle
                    {start}            First line index
                    {end}              Last line index (exclusive)
                    {strict_indexing}  Whether out-of-bounds should be an
                                       error.
                    {replacement}      Array of lines to use as replacement

nvim_buf_get_offset({buffer}, {index})                 *nvim_buf_get_offset()*
                Returns the byte offset for a line.

                Line 1 (index=0) has offset 0. UTF-8 bytes are counted. EOL is
                one byte. 'fileformat' and 'fileencoding' are ignored. The
                line index just after the last line gives the total byte-count
                of the buffer. A final EOL byte is counted if it would be
                written, see 'eol'.

                Unlike |line2byte()|, throws error for out-of-bounds indexing.
                Returns -1 for unloaded buffer.

                Parameters: ~
                    {buffer}  Buffer handle
                    {index}   Line index

                Return: ~
                    Integer byte offset, or -1 for unloaded buffer.

nvim_buf_get_var({buffer}, {name})                        *nvim_buf_get_var()*
                Gets a buffer-scoped (b:) variable.

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Variable name

                Return: ~
                    Variable value

nvim_buf_get_changedtick({buffer})                *nvim_buf_get_changedtick()*
                Gets a changed tick of a buffer

                Parameters: ~
                    {buffer}  Buffer handle.

                Return: ~
                    b:changedtickvalue.

nvim_buf_get_keymap({buffer}, {mode})                  *nvim_buf_get_keymap()*
                Gets a list of buffer-local |mapping| definitions.

                Parameters: ~
                    {mode}    Mode short-name ("n", "i", "v", ...)
                    {buffer}  Buffer handle

                Return: ~
                    Array of maparg()-like dictionaries describing mappings.
                    The "buffer" key holds the associated buffer handle.

nvim_buf_get_commands({buffer}, {opts})              *nvim_buf_get_commands()*
                Gets a map of buffer-local |user-commands|.

                Parameters: ~
                    {buffer}  Buffer handle.
                    {opts}    Optional parameters. Currently not used.

                Return: ~
                    Map of maps describing commands.

nvim_buf_set_var({buffer}, {name}, {value})               *nvim_buf_set_var()*
                Sets a buffer-scoped (b:) variable

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Variable name
                    {value}   Variable value

nvim_buf_del_var({buffer}, {name})                        *nvim_buf_del_var()*
                Removes a buffer-scoped (b:) variable

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Variable name

nvim_buf_get_option({buffer}, {name})                  *nvim_buf_get_option()*
                Gets a buffer option value

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Option name

                Return: ~
                    Option value

nvim_buf_set_option({buffer}, {name}, {value})         *nvim_buf_set_option()*
                Sets a buffer option value. Passing 'nil' as value deletes the
                option (only works if there's a global fallback)

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Option name
                    {value}   Option value

nvim_buf_get_name({buffer})                              *nvim_buf_get_name()*
                Gets the full file name for the buffer

                Parameters: ~
                    {buffer}  Buffer handle

                Return: ~
                    Buffer name

nvim_buf_set_name({buffer}, {name})                      *nvim_buf_set_name()*
                Sets the full file name for a buffer

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Buffer name

nvim_buf_is_loaded({buffer})                            *nvim_buf_is_loaded()*
                Checks if a buffer is valid and loaded. See |api-buffer| for
                more info about unloaded buffers.

                Parameters: ~
                    {buffer}  Buffer handle

                Return: ~
                    true if the buffer is valid and loaded, false otherwise.

nvim_buf_is_valid({buffer})                              *nvim_buf_is_valid()*
                Checks if a buffer is valid.

                Note:
                    Even if a buffer is valid it may have been unloaded. See
                    |api-buffer| for more info about unloaded buffers.

                Parameters: ~
                    {buffer}  Buffer handle

                Return: ~
                    true if the buffer is valid, false otherwise.

nvim_buf_get_mark({buffer}, {name})                      *nvim_buf_get_mark()*
                Return a tuple (row,col) representing the position of the
                named mark

                Parameters: ~
                    {buffer}  Buffer handle
                    {name}    Mark name

                Return: ~
                    (row, col) tuple

                                                    *nvim_buf_add_highlight()*
nvim_buf_add_highlight({buffer}, {ns_id}, {hl_group}, {line},
                       {col_start}, {col_end})
                Adds a highlight to buffer.

                Useful for plugins that dynamically generate highlights to a
                buffer (like a semantic highlighter or linter). The function
                adds a single highlight to a buffer. Unlike |matchaddpos()|
                highlights follow changes to line numbering (as lines are
                inserted/removed above the highlighted line), like signs and
                marks do.

                Namespaces are used for batch deletion/updating of a set of
                highlights. To create a namespace, use |nvim_create_namespace|
                which returns a namespace id. Pass it in to this function as
                `ns_id` to add highlights to the namespace. All highlights in
                the same namespace can then be cleared with single call to
                |nvim_buf_clear_namespace|. If the highlight never will be
                deleted by an API call, pass `ns_id = -1`.

                As a shorthand, `ns_id = 0` can be used to create a new
                namespace for the highlight, the allocated id is then
                returned. If `hl_group` is the empty string no highlight is
                added, but a new `ns_id` is still returned. This is supported
                for backwards compatibility, new code should use
                |nvim_create_namespace| to create a new empty namespace.

                Parameters: ~
                    {buffer}     Buffer handle
                    {ns_id}      namespace to use or -1 for ungrouped
                                 highlight
                    {hl_group}   Name of the highlight group to use
                    {line}       Line to highlight (zero-indexed)
                    {col_start}  Start of (byte-indexed) column range to
                                 highlight
                    {col_end}    End of (byte-indexed) column range to
                                 highlight, or -1 to highlight to end of line

                Return: ~
                    The ns_id that was used

                                                  *nvim_buf_clear_namespace()*
nvim_buf_clear_namespace({buffer}, {ns_id}, {line_start}, {line_end})
                Clears namespaced objects, highlights and virtual text, from a
                line range

                To clear the namespace in the entire buffer, pass in 0 and -1
                to line_start and line_end respectively.

                Parameters: ~
                    {buffer}      Buffer handle
                    {ns_id}       Namespace to clear, or -1 to clear all
                                  namespaces.
                    {line_start}  Start of range of lines to clear
                    {line_end}    End of range of lines to clear (exclusive)
                                  or -1 to clear to end of buffer.

                                                 *nvim_buf_set_virtual_text()*
nvim_buf_set_virtual_text({buffer}, {ns_id}, {line}, {chunks}, {opts})
                Set the virtual text (annotation) for a buffer line.

                By default (and currently the only option) the text will be
                placed after the buffer text. Virtual text will never cause
                reflow, rather virtual text will be truncated at the end of
                the screen line. The virtual text will begin one cell (|lcs-
                eol| or space) after the ordinary text.

                Namespaces are used to support batch deletion/updating of
                virtual text. To create a namespace, use
                |nvim_create_namespace|. Virtual text is cleared using
                |nvim_buf_clear_namespace|. The same `ns_id` can be used for
                both virtual text and highlights added by
                |nvim_buf_add_highlight|, both can then be cleared with a
                single call to |nvim_buf_clear_namespace|. If the virtual text
                never will be cleared by an API call, pass `ns_id = -1`.

                As a shorthand, `ns_id = 0` can be used to create a new
                namespace for the virtual text, the allocated id is then
                returned.

                Parameters: ~
                    {buffer}  Buffer handle
                    {ns_id}   Namespace to use or 0 to create a namespace, or
                              -1 for a ungrouped annotation
                    {line}    Line to annotate with virtual text (zero-
                              indexed)
                    {chunks}  A list of [text, hl_group] arrays, each
                              representing a text chunk with specified
                              highlight. `hl_group` element can be omitted for
                              no highlight.
                    {opts}    Optional parameters. Currently not used.

                Return: ~
                    The ns_id that was used


==============================================================================
Window Functions                                                  *api-window*

nvim_win_get_buf({window})                                *nvim_win_get_buf()*
                Gets the current buffer in a window

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    Buffer handle

nvim_win_set_buf({window}, {buffer})                      *nvim_win_set_buf()*
                Sets the current buffer in a window, without side-effects

                Parameters: ~
                    {window}  Window handle
                    {buffer}  Buffer handle

nvim_win_get_cursor({window})                          *nvim_win_get_cursor()*
                Gets the cursor position in the window

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    (row, col) tuple

nvim_win_set_cursor({window}, {pos})                   *nvim_win_set_cursor()*
                Sets the cursor position in the window

                Parameters: ~
                    {window}  Window handle
                    {pos}     (row, col) tuple representing the new position

nvim_win_get_height({window})                          *nvim_win_get_height()*
                Gets the window height

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    Height as a count of rows

nvim_win_set_height({window}, {height})                *nvim_win_set_height()*
                Sets the window height. This will only succeed if the screen
                is split horizontally.

                Parameters: ~
                    {window}  Window handle
                    {height}  Height as a count of rows

nvim_win_get_width({window})                            *nvim_win_get_width()*
                Gets the window width

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    Width as a count of columns

nvim_win_set_width({window}, {width})                   *nvim_win_set_width()*
                Sets the window width. This will only succeed if the screen is
                split vertically.

                Parameters: ~
                    {window}  Window handle
                    {width}   Width as a count of columns

nvim_win_get_var({window}, {name})                        *nvim_win_get_var()*
                Gets a window-scoped (w:) variable

                Parameters: ~
                    {window}  Window handle
                    {name}    Variable name

                Return: ~
                    Variable value

nvim_win_set_var({window}, {name}, {value})               *nvim_win_set_var()*
                Sets a window-scoped (w:) variable

                Parameters: ~
                    {window}  Window handle
                    {name}    Variable name
                    {value}   Variable value

nvim_win_del_var({window}, {name})                        *nvim_win_del_var()*
                Removes a window-scoped (w:) variable

                Parameters: ~
                    {window}  Window handle
                    {name}    Variable name

nvim_win_get_option({window}, {name})                  *nvim_win_get_option()*
                Gets a window option value

                Parameters: ~
                    {window}  Window handle
                    {name}    Option name

                Return: ~
                    Option value

nvim_win_set_option({window}, {name}, {value})         *nvim_win_set_option()*
                Sets a window option value. Passing 'nil' as value deletes the
                option(only works if there's a global fallback)

                Parameters: ~
                    {window}  Window handle
                    {name}    Option name
                    {value}   Option value

nvim_win_get_position({window})                      *nvim_win_get_position()*
                Gets the window position in display cells. First position is
                zero.

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    (row, col) tuple with the window position

nvim_win_get_tabpage({window})                        *nvim_win_get_tabpage()*
                Gets the window tabpage

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    Tabpage that contains the window

nvim_win_get_number({window})                          *nvim_win_get_number()*
                Gets the window number

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    Window number

nvim_win_is_valid({window})                              *nvim_win_is_valid()*
                Checks if a window is valid

                Parameters: ~
                    {window}  Window handle

                Return: ~
                    true if the window is valid, false otherwise


==============================================================================
Tabpage Functions                                                *api-tabpage*

nvim_tabpage_list_wins({tabpage})                   *nvim_tabpage_list_wins()*
                Gets the windows in a tabpage

                Parameters: ~
                    {tabpage}  Tabpage

                Return: ~
                    List of windows in tabpage

nvim_tabpage_get_var({tabpage}, {name})               *nvim_tabpage_get_var()*
                Gets a tab-scoped (t:) variable

                Parameters: ~
                    {tabpage}  Tabpage handle
                    {name}     Variable name

                Return: ~
                    Variable value

nvim_tabpage_set_var({tabpage}, {name}, {value})      *nvim_tabpage_set_var()*
                Sets a tab-scoped (t:) variable

                Parameters: ~
                    {tabpage}  Tabpage handle
                    {name}     Variable name
                    {value}    Variable value

nvim_tabpage_del_var({tabpage}, {name})               *nvim_tabpage_del_var()*
                Removes a tab-scoped (t:) variable

                Parameters: ~
                    {tabpage}  Tabpage handle
                    {name}     Variable name

nvim_tabpage_get_win({tabpage})                       *nvim_tabpage_get_win()*
                Gets the current window in a tabpage

                Parameters: ~
                    {tabpage}  Tabpage handle

                Return: ~
                    Window handle

nvim_tabpage_get_number({tabpage})                 *nvim_tabpage_get_number()*
                Gets the tabpage number

                Parameters: ~
                    {tabpage}  Tabpage handle

                Return: ~
                    Tabpage number

nvim_tabpage_is_valid({tabpage})                     *nvim_tabpage_is_valid()*
                Checks if a tabpage is valid

                Parameters: ~
                    {tabpage}  Tabpage handle

                Return: ~
                    true if the tabpage is valid, false otherwise


==============================================================================
UI Functions                                                          *api-ui*

nvim_ui_attach({width}, {height}, {options})                *nvim_ui_attach()*
                TODO: Documentation

nvim_ui_detach()                                            *nvim_ui_detach()*
                TODO: Documentation

nvim_ui_try_resize({width}, {height})                   *nvim_ui_try_resize()*
                TODO: Documentation

nvim_ui_set_option({name}, {value})                     *nvim_ui_set_option()*
                TODO: Documentation

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