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602 lines
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602 lines
23 KiB
Plaintext
*lsp.txt* LSP
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NVIM REFERENCE MANUAL
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LSP client/framework *lsp*
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Nvim supports the Language Server Protocol (LSP), which means it acts as
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a client to LSP servers and includes a Lua framework `vim.lsp` for building
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enhanced LSP tools.
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https://microsoft.github.io/language-server-protocol/
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LSP facilitates features like go-to-definition, find-references, hover,
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completion, rename, format, refactor, etc., using semantic whole-project
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analysis (unlike |ctags|).
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Type |gO| to see the table of contents.
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==============================================================================
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QUICKSTART *lsp-quickstart*
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Nvim provides a LSP client, but the servers are provided by third parties.
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Follow these steps to get LSP features:
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1. Install the nvim-lsp plugin. It provides common configuration for
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various servers so you can get started quickly.
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https://github.com/neovim/nvim-lsp
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2. Install a language server. Try ":LspInstall <tab>" or use your system
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package manager to install the relevant language server:
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https://microsoft.github.io/language-server-protocol/implementors/servers/
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3. Add `nvim_lsp.xx.setup{…}` to your vimrc, where "xx" is the name of the
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relevant config. See the nvim-lsp README for details.
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To check LSP clients attached to the current buffer: >
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:lua print(vim.inspect(vim.lsp.buf_get_clients()))
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<
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*lsp-config*
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Inline diagnostics are enabled automatically, e.g. syntax errors will be
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annotated in the buffer. But you probably want to use other features like
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go-to-definition, hover, etc. Example config: >
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nnoremap <silent> gd <cmd>lua vim.lsp.buf.declaration()<CR>
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nnoremap <silent> <c-]> <cmd>lua vim.lsp.buf.definition()<CR>
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nnoremap <silent> K <cmd>lua vim.lsp.buf.hover()<CR>
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nnoremap <silent> gD <cmd>lua vim.lsp.buf.implementation()<CR>
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nnoremap <silent> <c-k> <cmd>lua vim.lsp.buf.signature_help()<CR>
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nnoremap <silent> 1gD <cmd>lua vim.lsp.buf.type_definition()<CR>
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nnoremap <silent> gr <cmd>lua vim.lsp.buf.references()<CR>
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<
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*vim.lsp.omnifunc()*
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Nvim provides the vim.lsp.omnifunc 'omnifunc' handler which allows
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|i_CTRL-X_CTRL-O| to consume LSP completion features. Example config (note the
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use of |v:lua| to call Lua from Vimscript): >
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" Use LSP omni-completion in Python files.
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autocmd Filetype python setlocal omnifunc=v:lua.vim.lsp.omnifunc
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FAQ ~
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> How to force-reload LSP?
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Stop all clients, then reload the buffer. >
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:lua vim.lsp.stop_all_clients()
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:edit
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> Why isn't completion working?
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In the buffer where you want to use LSP, check that 'omnifunc' is set to
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"v:lua.vim.lsp.omnifunc": >
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:verbose set omnifunc?
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Some other plugin may be overriding the option. To avoid that, you could set
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the option in an |after-directory| ftplugin, e.g. "after/ftplugin/python.vim".
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================================================================================
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*lsp-core-api*
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The `vim.lsp` Lua module is a framework for building LSP plugins.
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1. Start with |vim.lsp.start_client()| and |vim.lsp.buf_attach_client()|.
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2. Peek at the API: >
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:lua print(vim.inspect(vim.lsp))
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< 3. See |lsp-advanced-js-example| for a full example.
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These are the core api functions for working with clients. You will mainly be
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using |vim.lsp.start_client()| and |vim.lsp.buf_attach_client()| for operations
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and |vim.lsp.get_client_by_id()| to retrieve a client by its id after it has
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initialized (or {config.on_init}. see below)
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*vim.lsp.start_client()*
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vim.lsp.start_client({config})
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The main function used for starting clients.
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Start a client and initialize it.
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Its arguments are passed via a configuration object {config}.
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Mandatory parameters:~
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`root_dir`
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{string} specifying the directory where the LSP server will base
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as its rootUri on initialization.
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`cmd`
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{string} or {list} which is the base command to execute for the LSP. A
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string will be run using |'shell'| and a list will be interpreted as a
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bare command with arguments passed. This is the same as |jobstart()|.
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Optional parameters:~
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`cmd_cwd`
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{string} specifying the directory to launch the `cmd` process. This is not
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related to `root_dir`.
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By default, |getcwd()| is used.
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`cmd_env`
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{table} specifying the environment flags to pass to the LSP on spawn.
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This can be specified using keys like a map or as a list with `k=v` pairs
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or both. Non-string values are coerced to a string.
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For example:
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`{ "PRODUCTION=true"; "TEST=123"; PORT = 8080; HOST = "0.0.0.0"; }`
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`capabilities`
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A {table} which will be used instead of
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`vim.lsp.protocol.make_client_capabilities()` which contains Nvim's
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default capabilities and passed to the language server on initialization.
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You'll probably want to use make_client_capabilities() and modify the
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result.
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NOTE:
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To send an empty dictionary, you should use
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`{[vim.type_idx]=vim.types.dictionary}` Otherwise, it will be encoded as
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an array.
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`callbacks`
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A {table} of whose keys are language server method names and the values
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are `function(err, method, params, client_id)` See |lsp-callbacks| for
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more. This will be combined with |lsp-default-callbacks| to resolve
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the callbacks for a client as a fallback.
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`init_options`
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A {table} of values to pass in the initialization request as
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`initializationOptions`. See the `initialize` in the LSP spec.
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`name`
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A {string} used in log messages. Defaults to {client_id}
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`offset_encoding`
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One of "utf-8", "utf-16", or "utf-32" which is the encoding that the LSP
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server expects.
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The default encoding for Language Server Protocol is UTF-16, but there are
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language servers which may use other encodings.
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By default, it is "utf-16" as specified in the LSP specification. The
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client does not verify this is correct.
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`on_error(code, ...)`
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A function for handling errors thrown by client operation. {code} is a
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number describing the error. Other arguments may be passed depending on
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the error kind. See |vim.lsp.client_errors| for possible errors.
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`vim.lsp.client_errors[code]` can be used to retrieve a human
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understandable string.
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`before_init(params, config)`
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Callback invoked before the LSP "initialize" phase, where `params`
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contains the parameters being sent to the server and `config` is the
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config that was passed to `start_client()`. You can use this to modify
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parameters before they are sent.
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`on_init(client, result)`
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Callback invoked after the LSP "initialize" phase, where `result` is
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a table of `capabilities` and anything else the server may send. For
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example, clangd sends `initialize_result.offsetEncoding` if
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`capabilities.offsetEncoding` was sent to it. You can only modify the
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`client.offset_encoding` here before any notifications are sent.
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`on_attach(client, bufnr)`
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A function which is called after the client is attached to a buffer.
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`on_exit(code, signal, client_id)`
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A function which is called after the client has exited. code is the exit
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code of the process, and signal is a number describing the signal used to
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terminate (if any).
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`trace`
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"off" | "messages" | "verbose" | nil passed directly to the language
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server in the initialize request.
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Invalid/empty values will default to "off"
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Returns:~
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{client_id}
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You can use |vim.lsp.get_client_by_id()| to get the actual client object.
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See |lsp-client| for what the client structure will be.
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NOTE: The client is only available after it has been initialized, which
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may happen after a small delay (or never if there is an error). For this
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reason, you may want to use `on_init` to do any actions once the client has
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been initialized.
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The client object has some methods and members related to using the client.
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Methods:~
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`request(method, params, [callback])`
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Send a request to the server. If callback is not specified, it will use
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{client.callbacks} to try to find a callback. If one is not found there,
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then an error will occur.
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This is a thin wrapper around {client.rpc.request} with some additional
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checking.
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Returns a boolean to indicate if the notification was successful. If it
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is false, then it will always be false (the client has shutdown).
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If it was successful, then it will return the request id as the second
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result. You can use this with `notify("$/cancel", { id = request_id })`
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to cancel the request. This helper is made automatically with
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|vim.lsp.buf_request()|
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Returns: status, [client_id]
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`notify(method, params)`
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This is just {client.rpc.notify}()
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Returns a boolean to indicate if the notification was successful. If it
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is false, then it will always be false (the client has shutdown).
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Returns: status
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`cancel_request(id)`
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This is just {client.rpc.notify}("$/cancelRequest", { id = id })
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Returns the same as `notify()`.
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`stop([force])`
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Stop a client, optionally with force.
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By default, it will just ask the server to shutdown without force.
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If you request to stop a client which has previously been requested to
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shutdown, it will automatically escalate and force shutdown.
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`is_stopped()`
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Returns true if the client is fully stopped.
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Members: ~
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`id` (number)
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The id allocated to the client.
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`name` (string)
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If a name is specified on creation, that will be used. Otherwise it is
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just the client id. This is used for logs and messages.
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`offset_encoding` (string)
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The encoding used for communicating with the server. You can modify this
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in the `on_init` method before text is sent to the server.
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`callbacks` (table)
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The callbacks used by the client as described in |lsp-callbacks|.
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`config` (table)
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A copy of the table that was passed by the user to
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|vim.lsp.start_client()|.
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`server_capabilities` (table)
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The response from the server sent on `initialize` describing the
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server's capabilities.
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`resolved_capabilities` (table)
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A normalized table of capabilities that we have detected based on the
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initialize response from the server in `server_capabilities`.
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*vim.lsp.buf_attach_client()*
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vim.lsp.buf_attach_client({bufnr}, {client_id})
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Implements the `textDocument/did*` notifications required to track a buffer
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for any language server.
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Without calling this, the server won't be notified of changes to a buffer.
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*vim.lsp.get_client_by_id()*
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vim.lsp.get_client_by_id({client_id})
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Look up an active client by its id, returns nil if it is not yet initialized
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or is not a valid id. Returns |lsp-client|
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*vim.lsp.stop_client()*
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vim.lsp.stop_client({client_id}, [{force}])
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Stop a client, optionally with force.
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By default, it will just ask the server to shutdown without force.
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If you request to stop a client which has previously been requested to
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shutdown, it will automatically escalate and force shutdown.
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You can also use `client.stop()` if you have access to the client.
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*vim.lsp.stop_all_clients()*
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vim.lsp.stop_all_clients([{force}])
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|vim.lsp.stop_client()|, but for all active clients.
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*vim.lsp.get_active_clients()*
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vim.lsp.get_active_clients()
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Return a list of all of the active clients. See |lsp-client| for a
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description of what a client looks like.
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*vim.lsp.rpc_response_error()*
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vim.lsp.rpc_response_error({code}, [{message}], [{data}])
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Helper function to create an RPC response object/table. This is an alias for
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|vim.lsp.rpc.rpc_response_error|. Code must be an RPC error code as
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described in `vim.lsp.protocol.ErrorCodes`.
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You can describe an optional {message} string or arbitrary {data} to send to
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the server.
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================================================================================
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LSP CALLBACKS *lsp-callbacks*
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DEFAULT CALLBACKS ~
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*vim.lsp.callbacks*
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The `vim.lsp.callbacks` table defines default callbacks used when
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creating a new client. Keys are LSP method names: >
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:lua print(vim.inspect(vim.tbl_keys(vim.lsp.callbacks)))
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These LSP requests/notifications are defined by default:
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textDocument/publishDiagnostics
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window/logMessage
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window/showMessage
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You can check these via `vim.tbl_keys(vim.lsp.callbacks)`.
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These will be used preferrentially in `vim.lsp.buf` methods when handling
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requests. They will also be used when responding to server requests and
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notifications.
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Use cases:
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- Users can modify this to customize to their preferences.
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- UI plugins can modify this by assigning to
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`vim.lsp.callbacks[method]` so as to provide more specialized
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handling, allowing you to leverage the UI capabilities available. UIs should
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try to be conscientious of any existing changes the user may have set
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already by checking for existing values.
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Any callbacks passed directly to `request` methods on a server client will
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have the highest precedence, followed by the `callbacks`.
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You can override the default handlers,
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- globally: by modifying the `vim.lsp.callbacks` table
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- per-client: by passing the {callbacks} table parameter to
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|vim.lsp.start_client|
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Each handler has this signature: >
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function(err, method, params, client_id)
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Callbacks are functions which are called in a variety of situations by the
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client. Their signature is `function(err, method, params, client_id)` They can
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be set by the {callbacks} parameter for |vim.lsp.start_client| or via the
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|vim.lsp.callbacks|.
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Handlers are called for:
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- Notifications from the server (`err` is always `nil`).
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- Requests initiated by the server (`err` is always `nil`).
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The handler can respond by returning two values: `result, err`
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where `err` must be shaped like an RPC error:
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`{ code, message, data? }`
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You can use |vim.lsp.rpc_response_error()| to create this object.
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- Handling requests initiated by the client if the request doesn't explicitly
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specify a callback (such as in |vim.lsp.buf_request|).
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================================================================================
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VIM.LSP.PROTOCOL *vim.lsp.protocol*
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Module `vim.lsp.protocol` defines constants dictated by the LSP specification,
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and helper functions for creating protocol-related objects.
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https://github.com/microsoft/language-server-protocol/raw/gh-pages/_specifications/specification-3-14.md
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Useful examples are `vim.lsp.protocol.ErrorCodes`. These objects allow reverse
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lookup by either the number or string name.
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e.g. vim.lsp.protocol.TextDocumentSyncKind.Full == 1
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vim.lsp.protocol.TextDocumentSyncKind[1] == "Full"
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Utility functions used internally are:
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`vim.lsp.protocol.make_client_capabilities()`
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Make a ClientCapabilities object. These are the builtin
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capabilities.
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`vim.lsp.protocol.resolve_capabilities(server_capabilites)`
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Creates a normalized object describing capabilities from the server
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capabilities.
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================================================================================
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*vim.lsp.util*
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TODO: Describe the utils here for handling/applying things from LSP.
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================================================================================
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*lsp-buf-methods*
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The "vim.lsp.buf_" functions perform operations for all LSP clients attached
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to the given buffer.
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*vim.lsp.buf_request()*
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vim.lsp.buf_request({bufnr}, {method}, {params}, [{callback}])
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Send a async request for all the clients active and attached to the buffer.
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Parameters: ~
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{bufnr}: The buffer handle or 0 for the current buffer.
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{method}: The LSP method name.
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{params}: The parameters to send.
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{callback}: An optional `function(err, method, params, client_id)` which
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will be called for this request. If you do not specify it, then it will
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use the client's callback in {client.callbacks}. See |lsp-callbacks| for
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more information.
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Returns:~
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A table from client id to the request id for all of the successful
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requests.
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The second result is a function which can be used to cancel all the
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requests. You can do this individually with `client.cancel_request()`
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*vim.lsp.buf_request_sync()*
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vim.lsp.buf_request_sync({bufnr}, {method}, {params}, [{timeout_ms}])
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Calls |vim.lsp.buf_request()|, but it will wait for the result and block Vim
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in the process.
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The parameters are the same as |vim.lsp.buf_request()|, but the return
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result is different.
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It will wait maximum of {timeout_ms} which defaults to 100ms.
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Returns:~
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If the timeout is exceeded or a cancel is sent or an error, it will cancel
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the request and return `nil, err` where `err` is a string that describes
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the reason why it failed.
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If it is successful, it will return a table from client id to result id.
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*vim.lsp.buf_notify()*
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vim.lsp.buf_notify({bufnr}, {method}, {params})
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Send a notification to all servers on the buffer.
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Parameters: ~
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{bufnr}: The buffer handle or 0 for the current buffer.
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{method}: The LSP method name.
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{params}: The parameters to send.
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================================================================================
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*lsp-logging*
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*vim.lsp.set_log_level()*
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vim.lsp.set_log_level({level})
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You can set the log level for language server client logging.
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Possible values: "trace", "debug", "info", "warn", "error"
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Default: "warn"
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Example: `lua vim.lsp.set_log_level("debug")`
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*vim.lsp.get_log_path()*
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vim.lsp.get_log_path()
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Returns the path that LSP logs are written.
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*vim.lsp.log_levels*
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vim.lsp.log_levels
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Log level dictionary with reverse lookup as well.
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Can be used to lookup the number from the name or vice-versa.
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Levels: "trace" (0), "debug" (1), "info" (2), "warn" (3), "error" (4)
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================================================================================
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LSP EXAMPLE *lsp-advanced-js-example*
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This example is for plugin authors who want to work with "vim.lsp" framework.
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If you only want to use (not develop) LSP features, see |lsp-quickstart|.
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For more advanced configurations where just filtering by filetype isn't
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sufficient, you can use the `vim.lsp.start_client()` and
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`vim.lsp.buf_attach_client()` commands to easily customize the configuration
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however you please. For example, if you want to do your own filtering, or
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start a new LSP client based on the root directory for if you plan to work
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with multiple projects in a single session. Below is a fully working Lua
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example which can do exactly that.
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The example will:
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1. Check for each new buffer whether or not we want to start an LSP client.
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2. Try to find a root directory by ascending from the buffer's path.
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3. Create a new LSP for that root directory if one doesn't exist.
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4. Attach the buffer to the client for that root directory.
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|
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>
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-- Some path manipulation utilities
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local function is_dir(filename)
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local stat = vim.loop.fs_stat(filename)
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return stat and stat.type == 'directory' or false
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end
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local path_sep = vim.loop.os_uname().sysname == "Windows" and "\\" or "/"
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-- Asumes filepath is a file.
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local function dirname(filepath)
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local is_changed = false
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local result = filepath:gsub(path_sep.."([^"..path_sep.."]+)$", function()
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is_changed = true
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return ""
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end)
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return result, is_changed
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end
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|
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local function path_join(...)
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return table.concat(vim.tbl_flatten {...}, path_sep)
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end
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|
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-- Ascend the buffer's path until we find the rootdir.
|
|
-- is_root_path is a function which returns bool
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local function buffer_find_root_dir(bufnr, is_root_path)
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local bufname = vim.api.nvim_buf_get_name(bufnr)
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if vim.fn.filereadable(bufname) == 0 then
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return nil
|
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end
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local dir = bufname
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|
-- Just in case our algo is buggy, don't infinite loop.
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for _ = 1, 100 do
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local did_change
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dir, did_change = dirname(dir)
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if is_root_path(dir, bufname) then
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return dir, bufname
|
|
end
|
|
-- If we can't ascend further, then stop looking.
|
|
if not did_change then
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return nil
|
|
end
|
|
end
|
|
end
|
|
|
|
-- A table to store our root_dir to client_id lookup. We want one LSP per
|
|
-- root directory, and this is how we assert that.
|
|
local javascript_lsps = {}
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|
-- Which filetypes we want to consider.
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|
local javascript_filetypes = {
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|
["javascript.jsx"] = true;
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|
["javascript"] = true;
|
|
["typescript"] = true;
|
|
["typescript.jsx"] = true;
|
|
}
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|
|
|
-- Create a template configuration for a server to start, minus the root_dir
|
|
-- which we will specify later.
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|
local javascript_lsp_config = {
|
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name = "javascript";
|
|
cmd = { path_join(os.getenv("JAVASCRIPT_LANGUAGE_SERVER_DIRECTORY"), "lib", "language-server-stdio.js") };
|
|
}
|
|
|
|
-- This needs to be global so that we can call it from the autocmd.
|
|
function check_start_javascript_lsp()
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|
local bufnr = vim.api.nvim_get_current_buf()
|
|
-- Filter which files we are considering.
|
|
if not javascript_filetypes[vim.api.nvim_buf_get_option(bufnr, 'filetype')] then
|
|
return
|
|
end
|
|
-- Try to find our root directory. We will define this as a directory which contains
|
|
-- node_modules. Another choice would be to check for `package.json`, or for `.git`.
|
|
local root_dir = buffer_find_root_dir(bufnr, function(dir)
|
|
return is_dir(path_join(dir, 'node_modules'))
|
|
-- return vim.fn.filereadable(path_join(dir, 'package.json')) == 1
|
|
-- return is_dir(path_join(dir, '.git'))
|
|
end)
|
|
-- We couldn't find a root directory, so ignore this file.
|
|
if not root_dir then return end
|
|
|
|
-- Check if we have a client alredy or start and store it.
|
|
local client_id = javascript_lsps[root_dir]
|
|
if not client_id then
|
|
local new_config = vim.tbl_extend("error", javascript_lsp_config, {
|
|
root_dir = root_dir;
|
|
})
|
|
client_id = vim.lsp.start_client(new_config)
|
|
javascript_lsps[root_dir] = client_id
|
|
end
|
|
-- Finally, attach to the buffer to track changes. This will do nothing if we
|
|
-- are already attached.
|
|
vim.lsp.buf_attach_client(bufnr, client_id)
|
|
end
|
|
|
|
vim.api.nvim_command [[autocmd BufReadPost * lua check_start_javascript_lsp()]]
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|
<
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================================================================================
|
|
LSP API *lsp-api*
|
|
|
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vim:tw=78:ts=8:ft=help:norl:
|