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eglot.el
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;;; eglot.el --- The Emacs Client for LSP servers -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2023 Free Software Foundation, Inc.
;; Version: 1.15
;; Author: João Távora <[email protected]>
;; Maintainer: João Távora <[email protected]>
;; URL: https://github.com/joaotavora/eglot
;; Keywords: convenience, languages
;; Package-Requires: ((emacs "26.3") (jsonrpc "1.0.16") (flymake "1.2.1") (project "0.9.8") (xref "1.6.2") (eldoc "1.14.0") (seq "2.23") (external-completion "0.1"))
;; This is a GNU ELPA :core package. Avoid adding functionality
;; that is not available in the version of Emacs recorded above or any
;; of the package dependencies.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Eglot ("Emacs Polyglot") is an Emacs LSP client that stays out of
;; your way.
;;
;; Typing M-x eglot in some source file is often enough to get you
;; started, if the language server you're looking to use is installed
;; in your system. Please refer to the manual, available from
;; https://joaotavora.github.io/eglot/ or from M-x info for more usage
;; instructions.
;;
;; If you wish to contribute changes to Eglot, please do read the user
;; manual first. Additionally, take the following in consideration:
;; * Eglot's main job is to hook up the information that language
;; servers offer via LSP to Emacs's UI facilities: Xref for
;; definition-chasing, Flymake for diagnostics, Eldoc for at-point
;; documentation, etc. Eglot's job is generally *not* to provide
;; such a UI itself, though a small number of simple
;; counter-examples do exist, e.g. in the `eglot-rename' command or
;; the `eglot-inlay-hints-mode' minor mode. When a new UI is
;; evidently needed, consider adding a new package to Emacs, or
;; extending an existing one.
;;
;; * Eglot was designed to function with just the UI facilities found
;; in the latest Emacs core, as long as those facilities are also
;; available as GNU ELPA :core packages. Historically, a number of
;; :core packages were added or reworked in Emacs to make this
;; possible. This principle should be upheld when adding new LSP
;; features or tweaking existing ones. Design any new facilities in
;; a way that they could work in the absence of LSP or using some
;; different protocol, then make sure Eglot can link up LSP
;; information to it.
;; * There are few Eglot configuration variables. This principle
;; should also be upheld. If Eglot had these variables, it could be
;; duplicating configuration found elsewhere, bloating itself up,
;; and making it generally hard to integrate with the ever growing
;; set of LSP features and Emacs packages. For instance, this is
;; why one finds a single variable
;; `eglot-ignored-server-capabilities' instead of a number of
;; capability-specific flags, or why customizing the display of
;; LSP-provided documentation is done via ElDoc's variables, not
;; Eglot's.
;;
;; * Linking up LSP information to other libraries is generally done
;; in the `eglot--managed-mode' minor mode function, by
;; buffer-locally setting the other library's variables to
;; Eglot-specific versions. When deciding what to set the variable
;; to, the general idea is to choose a good default for beginners
;; that doesn't clash with Emacs's defaults. The settings are only
;; in place during Eglot's LSP-enriched tenure over a project. Even
;; so, some of those decisions will invariably aggravate a minority
;; of Emacs power users, but these users can use `eglot-stay-out-of'
;; and `eglot-managed-mode-hook' to adjust things to their
;; preferences.
;;
;; * On occasion, to enable new features, Eglot can have soft
;; dependencies on popular libraries that are not in Emacs core.
;; "Soft" means that the dependency doesn't impair any other use of
;; Eglot beyond that feature. Such is the case of the snippet
;; functionality, via the Yasnippet package, Markdown formatting of
;; at-point documentation via the markdown-mode package, and nicer
;; looking completions when the Company package is used.
;;; Code:
(require 'imenu)
(require 'cl-lib)
(require 'url-parse)
(require 'url-util)
(require 'pcase)
(require 'compile) ; for some faces
(require 'warnings)
(eval-when-compile
(require 'subr-x))
(require 'filenotify)
(require 'ert)
(require 'text-property-search nil t)
(require 'diff-mode)
(require 'diff)
;; These dependencies are also GNU ELPA core packages. Because of
;; bug#62576, since there is a risk that M-x package-install, despite
;; having installed them, didn't correctly re-load them over the
;; built-in versions.
(eval-and-compile
(load "project")
(load "eldoc")
(load "seq")
(load "flymake")
(load "xref")
(load "jsonrpc")
(load "external-completion"))
;; forward-declare, but don't require (Emacs 28 doesn't seem to care)
(defvar markdown-fontify-code-blocks-natively)
(defvar company-backends)
(defvar company-tooltip-align-annotations)
(defvar tramp-ssh-controlmaster-options)
(defvar tramp-use-ssh-controlmaster-options)
;;; Obsolete aliases
;;;
(make-obsolete-variable 'eglot--managed-mode-hook
'eglot-managed-mode-hook "1.6")
(define-obsolete-variable-alias 'eglot-confirm-server-initiated-edits
'eglot-confirm-server-edits "1.16")
(define-obsolete-function-alias 'eglot--uri-to-path 'eglot-uri-to-path "1.16")
(define-obsolete-function-alias 'eglot--path-to-uri 'eglot-path-to-uri "1.16")
(define-obsolete-function-alias 'eglot--range-region 'eglot-range-region "1.16")
(define-obsolete-function-alias 'eglot--server-capable 'eglot-server-capable "1.16")
(define-obsolete-function-alias 'eglot--server-capable-or-lose 'eglot-server-capable-or-lose "1.16")
(define-obsolete-function-alias
'eglot-lsp-abiding-column 'eglot-utf-16-linepos "1.12")
(define-obsolete-function-alias
'eglot-current-column 'eglot-utf-32-linepos "1.12")
(define-obsolete-variable-alias
'eglot-current-column-function 'eglot-current-linepos-function "1.12")
(define-obsolete-function-alias
'eglot-move-to-current-column 'eglot-move-to-utf-32-linepos "1.12")
(define-obsolete-function-alias
'eglot-move-to-lsp-abiding-column 'eglot-move-to-utf-16-linepos "1.12")
(define-obsolete-variable-alias
'eglot-move-to-column-function 'eglot-move-to-linepos-function "1.12")
(define-obsolete-variable-alias 'eglot-ignored-server-capabilites
'eglot-ignored-server-capabilities "1.8")
;;;###autoload
(define-obsolete-function-alias 'eglot-update 'eglot-upgrade-eglot "29.1")
;;; User tweakable stuff
(defgroup eglot nil
"Interaction with Language Server Protocol servers."
:prefix "eglot-"
:group 'applications)
(defun eglot-alternatives (alternatives)
"Compute server-choosing function for `eglot-server-programs'.
Each element of ALTERNATIVES is a string PROGRAM or a list of
strings (PROGRAM ARGS...) where program names an LSP server
program to start with ARGS. Returns a function of one argument.
When invoked, that function will return a list (ABSPATH ARGS),
where ABSPATH is the absolute path of the PROGRAM that was
chosen (interactively or automatically)."
(lambda (&optional interactive)
;; JT@2021-06-13: This function is way more complicated than it
;; could be because it accounts for the fact that
;; `eglot--executable-find' may take much longer to execute on
;; remote files.
(let* ((listified (cl-loop for a in alternatives
collect (if (listp a) a (list a))))
(err (lambda ()
(error "None of '%s' are valid executables"
(mapconcat #'car listified ", ")))))
(cond (interactive
(let* ((augmented (mapcar (lambda (a)
(let ((found (eglot--executable-find
(car a) t)))
(and found
(cons (car a) (cons found (cdr a))))))
listified))
(available (remove nil augmented)))
(cond ((cdr available)
(cdr (assoc
(completing-read
"[eglot] More than one server executable available: "
(mapcar #'car available)
nil t nil nil (car (car available)))
available #'equal)))
((cdr (car available)))
(t
;; Don't error when used interactively, let the
;; Eglot prompt the user for alternative (github#719)
nil))))
(t
(cl-loop for (p . args) in listified
for probe = (eglot--executable-find p t)
when probe return (cons probe args)
finally (funcall err)))))))
(defvar eglot-server-programs `(((rust-ts-mode rust-mode) . ("rust-analyzer"))
((cmake-mode cmake-ts-mode) . ("cmake-language-server"))
(vimrc-mode . ("vim-language-server" "--stdio"))
((python-mode python-ts-mode)
. ,(eglot-alternatives
'("pylsp" "pyls" ("pyright-langserver" "--stdio") "jedi-language-server" "ruff-lsp")))
((js-json-mode json-mode json-ts-mode)
. ,(eglot-alternatives '(("vscode-json-language-server" "--stdio")
("vscode-json-languageserver" "--stdio")
("json-languageserver" "--stdio"))))
(((js-mode :language-id "javascript")
(js-ts-mode :language-id "javascript")
(tsx-ts-mode :language-id "typescriptreact")
(typescript-ts-mode :language-id "typescript")
(typescript-mode :language-id "typescript"))
. ("typescript-language-server" "--stdio"))
((bash-ts-mode sh-mode) . ("bash-language-server" "start"))
((php-mode phps-mode)
. ,(eglot-alternatives
'(("phpactor" "language-server")
("php" "vendor/felixfbecker/language-server/bin/php-language-server.php"))))
((c-mode c-ts-mode c++-mode c++-ts-mode objc-mode)
. ,(eglot-alternatives
'("clangd" "ccls")))
(((caml-mode :language-id "ocaml")
(tuareg-mode :language-id "ocaml") reason-mode)
. ("ocamllsp"))
((ruby-mode ruby-ts-mode)
. ("solargraph" "socket" "--port" :autoport))
(haskell-mode
. ("haskell-language-server-wrapper" "--lsp"))
(elm-mode . ("elm-language-server"))
(mint-mode . ("mint" "ls"))
(kotlin-mode . ("kotlin-language-server"))
((go-mode go-dot-mod-mode go-dot-work-mode go-ts-mode go-mod-ts-mode)
. ("gopls"))
((R-mode ess-r-mode) . ("R" "--slave" "-e"
"languageserver::run()"))
((java-mode java-ts-mode) . ("jdtls"))
((dart-mode dart-ts-mode)
. ("dart" "language-server"
"--client-id" "emacs.eglot-dart"))
((elixir-mode elixir-ts-mode heex-ts-mode)
. ,(if (and (fboundp 'w32-shell-dos-semantics)
(w32-shell-dos-semantics))
'("language_server.bat")
(eglot-alternatives
'("language_server.sh" "start_lexical.sh"))))
(ada-mode . ("ada_language_server"))
(scala-mode . ,(eglot-alternatives
'("metals" "metals-emacs")))
(racket-mode . ("racket" "-l" "racket-langserver"))
((tex-mode context-mode texinfo-mode bibtex-mode)
. ,(eglot-alternatives '("digestif" "texlab")))
(erlang-mode . ("erlang_ls" "--transport" "stdio"))
((yaml-ts-mode yaml-mode) . ("yaml-language-server" "--stdio"))
(nix-mode . ,(eglot-alternatives '("nil" "rnix-lsp" "nixd")))
(nickel-mode . ("nls"))
(gdscript-mode . ("localhost" 6008))
((fortran-mode f90-mode) . ("fortls"))
(futhark-mode . ("futhark" "lsp"))
((lua-mode lua-ts-mode) . ,(eglot-alternatives
'("lua-language-server" "lua-lsp")))
(zig-mode . ("zls"))
((css-mode css-ts-mode)
. ,(eglot-alternatives '(("vscode-css-language-server" "--stdio")
("css-languageserver" "--stdio"))))
(html-mode . ,(eglot-alternatives '(("vscode-html-language-server" "--stdio") ("html-languageserver" "--stdio"))))
((dockerfile-mode dockerfile-ts-mode) . ("docker-langserver" "--stdio"))
((clojure-mode clojurescript-mode clojurec-mode clojure-ts-mode)
. ("clojure-lsp"))
((csharp-mode csharp-ts-mode)
. ,(eglot-alternatives
'(("omnisharp" "-lsp")
("csharp-ls"))))
(purescript-mode . ("purescript-language-server" "--stdio"))
((perl-mode cperl-mode) . ("perl" "-MPerl::LanguageServer" "-e" "Perl::LanguageServer::run"))
(markdown-mode
. ,(eglot-alternatives
'(("marksman" "server")
("vscode-markdown-language-server" "--stdio"))))
(graphviz-dot-mode . ("dot-language-server" "--stdio"))
(terraform-mode . ("terraform-ls" "serve"))
((uiua-ts-mode uiua-mode) . ("uiua" "lsp")))
"How the command `eglot' guesses the server to start.
An association list of (MAJOR-MODE . CONTACT) pairs. MAJOR-MODE
identifies the buffers that are to be managed by a specific
language server. The associated CONTACT specifies how to connect
to a server for those buffers.
MAJOR-MODE can be:
* In the most common case, a symbol such as `c-mode';
* A list (MAJOR-MODE-SYMBOL :LANGUAGE-ID ID) where
MAJOR-MODE-SYMBOL is the aforementioned symbol and ID is a
string identifying the language to the server;
* A list combining the previous two alternatives, meaning
multiple major modes will be associated with a single server
program. This association is such that the same resulting
server process will manage buffers of different major modes.
CONTACT can be:
* In the most common case, a list of strings (PROGRAM [ARGS...]).
PROGRAM is called with ARGS and is expected to serve LSP requests
over the standard input/output channels.
* A list (PROGRAM [ARGS...] :initializationOptions OPTIONS),
whereupon PROGRAM is called with ARGS as in the first option,
and the LSP \"initializationOptions\" JSON object is
constructed from OPTIONS. If OPTIONS is a unary function, it
is called with the server instance and should return a JSON
object.
* A list (HOST PORT [TCP-ARGS...]) where HOST is a string and
PORT is a positive integer for connecting to a server via TCP.
Remaining ARGS are passed to `open-network-stream' for
upgrading the connection with encryption or other capabilities.
* A list (PROGRAM [ARGS...] :autoport [MOREARGS...]), whereupon a
combination of previous options is used. First, an attempt is
made to find an available server port, then PROGRAM is launched
with ARGS; the `:autoport' keyword substituted for that number;
and MOREARGS. Eglot then attempts to establish a TCP
connection to that port number on the localhost.
* A cons (CLASS-NAME . INITARGS) where CLASS-NAME is a symbol
designating a subclass of `eglot-lsp-server', for representing
experimental LSP servers. INITARGS is a keyword-value plist
used to initialize the object of CLASS-NAME, or a plain list
interpreted as the previous descriptions of CONTACT. In the
latter case that plain list is used to produce a plist with a
suitable :PROCESS initarg to CLASS-NAME. The class
`eglot-lsp-server' descends from `jsonrpc-process-connection',
which you should see for the semantics of the mandatory
:PROCESS argument.
* A function of a single argument producing any of the above
values for CONTACT. The argument's value is non-nil if the
connection was requested interactively (e.g. from the `eglot'
command), and nil if it wasn't (e.g. from `eglot-ensure'). If
the call is interactive, the function can ask the user for
hints on finding the required programs, etc. Otherwise, it
should not ask the user for any input, and return nil or signal
an error if it can't produce a valid CONTACT. The helper
function `eglot-alternatives' (which see) can be used to
produce a function that offers more than one server for a given
MAJOR-MODE.")
(defface eglot-highlight-symbol-face
'((t (:inherit bold)))
"Face used to highlight the symbol at point.")
(defface eglot-mode-line
'((t (:inherit font-lock-constant-face :weight bold)))
"Face for package-name in Eglot's mode line.")
(defface eglot-diagnostic-tag-unnecessary-face
'((t (:inherit shadow)))
"Face used to render unused or unnecessary code.")
(defface eglot-diagnostic-tag-deprecated-face
'((t . (:inherit shadow :strike-through t)))
"Face used to render deprecated or obsolete code.")
(defcustom eglot-autoreconnect 3
"Control ability to reconnect automatically to the LSP server.
If t, always reconnect automatically (not recommended). If nil,
never reconnect automatically after unexpected server shutdowns,
crashes or network failures. A positive integer number says to
only autoreconnect if the previous successful connection attempt
lasted more than that many seconds."
:type '(choice (const :tag "Reconnect automatically" t)
(const :tag "Never reconnect" nil)
(integer :tag "Number of seconds")))
(defcustom eglot-connect-timeout 30
"Number of seconds before timing out LSP connection attempts.
If nil, never time out."
:type '(choice (number :tag "Number of seconds")
(const :tag "Never time out" nil)))
(defcustom eglot-sync-connect 3
"Control blocking of LSP connection attempts.
If t, block for `eglot-connect-timeout' seconds. A positive
integer number means block for that many seconds, and then wait
for the connection in the background. nil has the same meaning
as 0, i.e. don't block at all."
:type '(choice (const :tag "Block for `eglot-connect-timeout' seconds" t)
(const :tag "Never block" nil)
(integer :tag "Number of seconds to block")))
(defcustom eglot-autoshutdown nil
"If non-nil, shut down server after killing last managed buffer."
:type 'boolean)
(defcustom eglot-send-changes-idle-time 0.5
"Don't tell server of changes before Emacs's been idle for this many seconds."
:type 'number)
(defcustom eglot-events-buffer-size 2000000
"Control the size of the Eglot events buffer.
If a number, don't let the buffer grow larger than that many
characters. If 0, don't use an event's buffer at all. If nil,
let the buffer grow forever.
For changes on this variable to take effect on a connection
already started, you need to restart the connection. That can be
done by `eglot-reconnect'."
:type '(choice (const :tag "No limit" nil)
(integer :tag "Number of characters")))
(defcustom eglot-confirm-server-edits '((eglot-rename . nil)
(t . maybe-summary))
"Control if changes proposed by LSP should be confirmed with user.
If this variable's value is the symbol `diff', a diff buffer is
pops up, allowing the user to apply each change individually. If
the symbol `summary' or any other non-nil value, the user is
prompted in the minibuffer with aa short summary of changes. The
symbols `maybe-diff' and `maybe-summary' mean that the
confirmation is offered to the user only if the changes target
files visited in buffers. Finally, a nil value means all changes
are applied directly without any confirmation.
If this variable's value can also be an alist ((COMMAND . ACTION)
...) where COMMAND is a symbol designating a command, such as
`eglot-rename', `eglot-code-actions',
`eglot-code-action-quickfix', etc. ACTION is one of the symbols
described above. The value `t' for COMMAND is accepted and its
ACTION is the default value for commands not in the alist."
:type (let ((basic-choices
'((const :tag "Use diff" diff)
(const :tag "Summarize and prompt" summary)
(const :tag "Maybe use diff" maybe-diff)
(const :tag "Maybe summarize and prompt" maybe-summary)
(const :tag "Don't confirm" nil))))
`(choice ,@basic-choices
(alist :tag "Per-command alist"
:key-type (choice (function :tag "Command")
(const :tag "Default" t))
:value-type (choice . ,basic-choices)))))
(defcustom eglot-extend-to-xref nil
"If non-nil, activate Eglot in cross-referenced non-project files."
:type 'boolean)
(defcustom eglot-prefer-plaintext nil
"If non-nil, always request plaintext responses to hover requests."
:type 'boolean)
(defcustom eglot-menu-string "eglot"
"String displayed in mode line when Eglot is active."
:type 'string)
(defcustom eglot-report-progress t
"If non-nil, show progress of long running LSP server work.
If set to `messages', use *Messages* buffer, else use Eglot's
mode line indicator."
:type '(choice (const :tag "Don't show progress" nil)
(const :tag "Show progress in *Messages*" messages)
(const :tag "Show progress in Eglot's mode line indicator" t))
:version "1.10")
(defcustom eglot-ignored-server-capabilities (list)
"LSP server capabilities that Eglot could use, but won't.
You could add, for instance, the symbol
`:documentHighlightProvider' to prevent automatic highlighting
under cursor."
:type '(set
:tag "Tick the ones you're not interested in"
(const :tag "Documentation on hover" :hoverProvider)
(const :tag "Code completion" :completionProvider)
(const :tag "Function signature help" :signatureHelpProvider)
(const :tag "Go to definition" :definitionProvider)
(const :tag "Go to type definition" :typeDefinitionProvider)
(const :tag "Go to implementation" :implementationProvider)
(const :tag "Go to declaration" :declarationProvider)
(const :tag "Find references" :referencesProvider)
(const :tag "Highlight symbols automatically" :documentHighlightProvider)
(const :tag "List symbols in buffer" :documentSymbolProvider)
(const :tag "List symbols in workspace" :workspaceSymbolProvider)
(const :tag "Execute code actions" :codeActionProvider)
(const :tag "Code lens" :codeLensProvider)
(const :tag "Format buffer" :documentFormattingProvider)
(const :tag "Format portion of buffer" :documentRangeFormattingProvider)
(const :tag "On-type formatting" :documentOnTypeFormattingProvider)
(const :tag "Rename symbol" :renameProvider)
(const :tag "Highlight links in document" :documentLinkProvider)
(const :tag "Decorate color references" :colorProvider)
(const :tag "Fold regions of buffer" :foldingRangeProvider)
(const :tag "Execute custom commands" :executeCommandProvider)
(const :tag "Inlay hints" :inlayHintProvider)))
(defvar eglot-withhold-process-id nil
"If non-nil, Eglot will not send the Emacs process id to the language server.
This can be useful when using docker to run a language server.")
;;; Constants
;;;
(defconst eglot--version
(eval-when-compile
(when byte-compile-current-file
(require 'lisp-mnt)
(lm-version byte-compile-current-file)))
"The version as a string of this version of Eglot.
It is nil if Eglot is not byte-complied.")
(defconst eglot--symbol-kind-names
`((1 . "File") (2 . "Module")
(3 . "Namespace") (4 . "Package") (5 . "Class")
(6 . "Method") (7 . "Property") (8 . "Field")
(9 . "Constructor") (10 . "Enum") (11 . "Interface")
(12 . "Function") (13 . "Variable") (14 . "Constant")
(15 . "String") (16 . "Number") (17 . "Boolean")
(18 . "Array") (19 . "Object") (20 . "Key")
(21 . "Null") (22 . "EnumMember") (23 . "Struct")
(24 . "Event") (25 . "Operator") (26 . "TypeParameter")))
(defconst eglot--kind-names
`((1 . "Text") (2 . "Method") (3 . "Function") (4 . "Constructor")
(5 . "Field") (6 . "Variable") (7 . "Class") (8 . "Interface")
(9 . "Module") (10 . "Property") (11 . "Unit") (12 . "Value")
(13 . "Enum") (14 . "Keyword") (15 . "Snippet") (16 . "Color")
(17 . "File") (18 . "Reference") (19 . "Folder") (20 . "EnumMember")
(21 . "Constant") (22 . "Struct") (23 . "Event") (24 . "Operator")
(25 . "TypeParameter")))
(defconst eglot--tag-faces
`((1 . eglot-diagnostic-tag-unnecessary-face)
(2 . eglot-diagnostic-tag-deprecated-face)))
(defvaralias 'eglot-{} 'eglot--{})
(defconst eglot--{} (make-hash-table :size 1) "The empty JSON object.")
(defun eglot--executable-find (command &optional remote)
"Like Emacs 27's `executable-find', ignore REMOTE on Emacs 26."
(if (>= emacs-major-version 27) (executable-find command remote)
(executable-find command)))
(defun eglot--accepted-formats ()
(if (and (not eglot-prefer-plaintext) (fboundp 'gfm-view-mode))
["markdown" "plaintext"] ["plaintext"]))
(defconst eglot--uri-path-allowed-chars
(let ((vec (copy-sequence url-path-allowed-chars)))
(aset vec ?: nil) ;; see github#639
vec)
"Like `url-path-allows-chars' but more restrictive.")
;;; Message verification helpers
;;;
(eval-and-compile
(defvar eglot--lsp-interface-alist
`(
(CodeAction (:title) (:kind :diagnostics :edit :command :isPreferred :data))
(ConfigurationItem () (:scopeUri :section))
(Command ((:title . string) (:command . string)) (:arguments))
(CompletionItem (:label)
(:kind :detail :documentation :deprecated :preselect
:sortText :filterText :insertText :insertTextFormat
:textEdit :additionalTextEdits :commitCharacters
:command :data :tags))
(Diagnostic (:range :message) (:severity :code :source :relatedInformation :codeDescription :tags))
(DocumentHighlight (:range) (:kind))
(FileSystemWatcher (:globPattern) (:kind))
(Hover (:contents) (:range))
(InitializeResult (:capabilities) (:serverInfo))
(Location (:uri :range))
(LocationLink (:targetUri :targetRange :targetSelectionRange) (:originSelectionRange))
(LogMessageParams (:type :message))
(MarkupContent (:kind :value))
(ParameterInformation (:label) (:documentation))
(Position (:line :character))
(Range (:start :end))
(Registration (:id :method) (:registerOptions))
(ResponseError (:code :message) (:data))
(ShowMessageParams (:type :message))
(ShowMessageRequestParams (:type :message) (:actions))
(SignatureHelp (:signatures) (:activeSignature :activeParameter))
(SignatureInformation (:label) (:documentation :parameters :activeParameter))
(SymbolInformation (:name :kind :location)
(:deprecated :containerName))
(DocumentSymbol (:name :range :selectionRange :kind)
(:detail :deprecated :children))
(TextDocumentEdit (:textDocument :edits) ())
(TextEdit (:range :newText))
(VersionedTextDocumentIdentifier (:uri :version) ())
(WorkDoneProgress (:kind) (:title :message :percentage :cancellable))
(WorkspaceEdit () (:changes :documentChanges))
(WorkspaceSymbol (:name :kind) (:containerName :location :data))
(InlayHint (:position :label) (:kind :textEdits :tooltip :paddingLeft
:paddingRight :data))
(InlayHintLabelPart (:value) (:tooltip :location :command)))
"Alist (INTERFACE-NAME . INTERFACE) of known external LSP interfaces.
INTERFACE-NAME is a symbol designated by the spec as
\"interface\". INTERFACE is a list (REQUIRED OPTIONAL) where
REQUIRED and OPTIONAL are lists of KEYWORD designating field
names that must be, or may be, respectively, present in a message
adhering to that interface. KEY can be a keyword or a cons (SYM
TYPE), where type is used by `cl-typep' to check types at
runtime.
Here's what an element of this alist might look like:
(Command ((:title . string) (:command . string)) (:arguments))"))
(eval-and-compile
(defvar eglot-strict-mode
'(;; Uncomment next lines for fun and debugging
;; disallow-non-standard-keys
;; enforce-required-keys
;; enforce-optional-keys
no-unknown-interfaces)
"How strictly to check LSP interfaces at compile- and run-time.
Value is a list of symbols (if the list is empty, no checks are
performed).
If the symbol `disallow-non-standard-keys' is present, an error
is raised if any extraneous fields are sent by the server. At
compile-time, a warning is raised if a destructuring spec
includes such a field.
If the symbol `enforce-required-keys' is present, an error is
raised if any required fields are missing from the message sent
from the server. At compile-time, a warning is raised if a
destructuring spec doesn't use such a field.
If the symbol `enforce-optional-keys' is present, nothing special
happens at run-time. At compile-time, a warning is raised if a
destructuring spec doesn't use all optional fields.
If the symbol `disallow-unknown-methods' is present, Eglot warns
on unknown notifications and errors on unknown requests.
If the symbol `no-unknown-interfaces' is present, Eglot warns at
compile time if an undeclared LSP interface is used."))
(cl-defun eglot--check-object (interface-name
object
&optional
(enforce-required t)
(disallow-non-standard t)
(check-types t))
"Check that OBJECT conforms to INTERFACE. Error otherwise."
(cl-destructuring-bind
(&key types required-keys optional-keys &allow-other-keys)
(eglot--interface interface-name)
(when-let ((missing (and enforce-required
(cl-set-difference required-keys
(eglot--plist-keys object)))))
(eglot--error "A `%s' must have %s" interface-name missing))
(when-let ((excess (and disallow-non-standard
(cl-set-difference
(eglot--plist-keys object)
(append required-keys optional-keys)))))
(eglot--error "A `%s' mustn't have %s" interface-name excess))
(when check-types
(cl-loop
for (k v) on object by #'cddr
for type = (or (cdr (assoc k types)) t) ;; FIXME: enforce nil type?
unless (cl-typep v type)
do (eglot--error "A `%s' must have a %s as %s, but has %s"
interface-name)))
t))
(eval-and-compile
(defun eglot--keywordize-vars (vars)
(mapcar (lambda (var) (intern (format ":%s" var))) vars))
(defun eglot--ensure-type (k) (if (consp k) k (cons k t)))
(defun eglot--interface (interface-name)
(let* ((interface (assoc interface-name eglot--lsp-interface-alist))
(required (mapcar #'eglot--ensure-type (car (cdr interface))))
(optional (mapcar #'eglot--ensure-type (cadr (cdr interface)))))
(list :types (append required optional)
:required-keys (mapcar #'car required)
:optional-keys (mapcar #'car optional))))
(defun eglot--check-dspec (interface-name dspec)
"Check destructuring spec DSPEC against INTERFACE-NAME."
(cl-destructuring-bind (&key required-keys optional-keys &allow-other-keys)
(eglot--interface interface-name)
(cond ((or required-keys optional-keys)
(let ((too-many
(and
(memq 'disallow-non-standard-keys eglot-strict-mode)
(cl-set-difference
(eglot--keywordize-vars dspec)
(append required-keys optional-keys))))
(ignored-required
(and
(memq 'enforce-required-keys eglot-strict-mode)
(cl-set-difference
required-keys (eglot--keywordize-vars dspec))))
(missing-out
(and
(memq 'enforce-optional-keys eglot-strict-mode)
(cl-set-difference
optional-keys (eglot--keywordize-vars dspec)))))
(when too-many (byte-compile-warn
"Destructuring for %s has extraneous %s"
interface-name too-many))
(when ignored-required (byte-compile-warn
"Destructuring for %s ignores required %s"
interface-name ignored-required))
(when missing-out (byte-compile-warn
"Destructuring for %s is missing out on %s"
interface-name missing-out))))
((memq 'no-unknown-interfaces eglot-strict-mode)
(byte-compile-warn "Unknown LSP interface %s" interface-name))))))
(cl-defmacro eglot--dbind (vars object &body body)
"Destructure OBJECT, binding VARS in BODY.
VARS is ([(INTERFACE)] SYMS...)
Honor `eglot-strict-mode'."
(declare (indent 2) (debug (sexp sexp &rest form)))
(let ((interface-name (if (consp (car vars))
(car (pop vars))))
(object-once (make-symbol "object-once"))
(fn-once (make-symbol "fn-once")))
(cond (interface-name
(eglot--check-dspec interface-name vars)
`(let ((,object-once ,object))
(cl-destructuring-bind (&key ,@vars &allow-other-keys) ,object-once
(eglot--check-object ',interface-name ,object-once
(memq 'enforce-required-keys eglot-strict-mode)
(memq 'disallow-non-standard-keys eglot-strict-mode)
(memq 'check-types eglot-strict-mode))
,@body)))
(t
`(let ((,object-once ,object)
(,fn-once (lambda (,@vars) ,@body)))
(if (memq 'disallow-non-standard-keys eglot-strict-mode)
(cl-destructuring-bind (&key ,@vars) ,object-once
(funcall ,fn-once ,@vars))
(cl-destructuring-bind (&key ,@vars &allow-other-keys) ,object-once
(funcall ,fn-once ,@vars))))))))
(cl-defmacro eglot--lambda (cl-lambda-list &body body)
"Function of args CL-LAMBDA-LIST for processing INTERFACE objects.
Honor `eglot-strict-mode'."
(declare (indent 1) (debug (sexp &rest form)))
(let ((e (cl-gensym "jsonrpc-lambda-elem")))
`(lambda (,e) (cl-block nil (eglot--dbind ,cl-lambda-list ,e ,@body)))))
(cl-defmacro eglot--dcase (obj &rest clauses)
"Like `pcase', but for the LSP object OBJ.
CLAUSES is a list (DESTRUCTURE FORMS...) where DESTRUCTURE is
treated as in `eglot--dbind'."
(declare (indent 1) (debug (sexp &rest (sexp &rest form))))
(let ((obj-once (make-symbol "obj-once")))
`(let ((,obj-once ,obj))
(cond
,@(cl-loop
for (vars . body) in clauses
for vars-as-keywords = (eglot--keywordize-vars vars)
for interface-name = (if (consp (car vars))
(car (pop vars)))
for condition =
(cond (interface-name
(eglot--check-dspec interface-name vars)
;; In this mode, in runtime, we assume
;; `eglot-strict-mode' is partially on, otherwise we
;; can't disambiguate between certain types.
`(ignore-errors
(eglot--check-object
',interface-name ,obj-once
t
(memq 'disallow-non-standard-keys eglot-strict-mode)
t)))
(t
;; In this interface-less mode we don't check
;; `eglot-strict-mode' at all: just check that the object
;; has all the keys the user wants to destructure.
`(null (cl-set-difference
',vars-as-keywords
(eglot--plist-keys ,obj-once)))))
collect `(,condition
(cl-destructuring-bind (&key ,@vars &allow-other-keys)
,obj-once
,@body)))
(t
(eglot--error "%S didn't match any of %S"
,obj-once
',(mapcar #'car clauses)))))))
(cl-defmacro eglot--when-live-buffer (buf &rest body)
"Check BUF live, then do BODY in it." (declare (indent 1) (debug t))
(let ((b (cl-gensym)))
`(let ((,b ,buf)) (if (buffer-live-p ,b) (with-current-buffer ,b ,@body)))))
(cl-defmacro eglot--when-buffer-window (buf &body body)
"Check BUF showing somewhere, then do BODY in it." (declare (indent 1) (debug t))
(let ((b (cl-gensym)))
`(let ((,b ,buf))
;;notice the exception when testing with `ert'
(when (or (get-buffer-window ,b) (ert-running-test))
(with-current-buffer ,b ,@body)))))
(cl-defmacro eglot--widening (&rest body)
"Save excursion and restriction. Widen. Then run BODY." (declare (debug t))
`(save-excursion (save-restriction (widen) ,@body)))
;;; Public Elisp API
;;;
(cl-defgeneric eglot-handle-request (server method &rest params)
"Handle SERVER's METHOD request with PARAMS.")
(cl-defgeneric eglot-handle-notification (server method &rest params)
"Handle SERVER's METHOD notification with PARAMS.")
(cl-defgeneric eglot-execute-command (_ _ _)
(declare (obsolete eglot-execute "30.1"))
(:method
(server command arguments)
(eglot--request server :workspace/executeCommand
`(:command ,(format "%s" command) :arguments ,arguments))))
(cl-defgeneric eglot-execute (server action)
"Ask SERVER to execute ACTION.
ACTION is an LSP object of either `CodeAction' or `Command' type."
(:method
(server action) "Default implementation."
(eglot--dcase action
(((Command)) (eglot--request server :workspace/executeCommand action))
(((CodeAction) edit command data)
(if (and (null edit) (null command) data
(eglot-server-capable :codeActionProvider :resolveProvider))
(eglot-execute server (eglot--request server :codeAction/resolve action))
(when edit (eglot--apply-workspace-edit edit this-command))
(when command (eglot--request server :workspace/executeCommand command)))))))
(cl-defgeneric eglot-initialization-options (server)
"JSON object to send under `initializationOptions'."
(:method (s)
(let ((probe (plist-get (eglot--saved-initargs s) :initializationOptions)))
(cond ((functionp probe) (funcall probe s))
(probe)
(t eglot--{})))))
(cl-defgeneric eglot-register-capability (server method id &rest params)
"Ask SERVER to register capability METHOD marked with ID."
(:method
(_s method _id &rest _params)
(eglot--warn "Server tried to register unsupported capability `%s'"
method)))
(cl-defgeneric eglot-unregister-capability (server method id &rest params)
"Ask SERVER to register capability METHOD marked with ID."
(:method
(_s method _id &rest _params)
(eglot--warn "Server tried to unregister unsupported capability `%s'"
method)))
(cl-defgeneric eglot-client-capabilities (server)
"What the Eglot LSP client supports for SERVER."
(:method (s)
(list
:workspace (list
:applyEdit t
:executeCommand `(:dynamicRegistration :json-false)
:workspaceEdit `(:documentChanges t)
:didChangeWatchedFiles
`(:dynamicRegistration
,(if (eglot--trampish-p s) :json-false t))
:symbol `(:dynamicRegistration :json-false)
:configuration t
:workspaceFolders t)
:textDocument
(list
:synchronization (list
:dynamicRegistration :json-false
:willSave t :willSaveWaitUntil t :didSave t)
:completion (list :dynamicRegistration :json-false
:completionItem
`(:snippetSupport
,(if (and
(not (eglot--stay-out-of-p 'yasnippet))
(eglot--snippet-expansion-fn))
t
:json-false)
:deprecatedSupport t
:resolveSupport (:properties
["documentation"
"details"
"additionalTextEdits"])
:tagSupport (:valueSet [1]))
:contextSupport t)
:hover (list :dynamicRegistration :json-false
:contentFormat (eglot--accepted-formats))
:signatureHelp (list :dynamicRegistration :json-false
:signatureInformation
`(:parameterInformation
(:labelOffsetSupport t)
:documentationFormat ,(eglot--accepted-formats)
:activeParameterSupport t))
:references `(:dynamicRegistration :json-false)
:definition (list :dynamicRegistration :json-false
:linkSupport t)
:declaration (list :dynamicRegistration :json-false
:linkSupport t)
:implementation (list :dynamicRegistration :json-false
:linkSupport t)
:typeDefinition (list :dynamicRegistration :json-false
:linkSupport t)
:documentSymbol (list
:dynamicRegistration :json-false
:hierarchicalDocumentSymbolSupport t
:symbolKind `(:valueSet
[,@(mapcar
#'car eglot--symbol-kind-names)]))
:documentHighlight `(:dynamicRegistration :json-false)
:codeAction (list
:dynamicRegistration :json-false
:resolveSupport `(:properties ["edit" "command"])
:dataSupport t
:codeActionLiteralSupport
'(:codeActionKind
(:valueSet
["quickfix"
"refactor" "refactor.extract"
"refactor.inline" "refactor.rewrite"
"source" "source.organizeImports"]))
:isPreferredSupport t)
:formatting `(:dynamicRegistration :json-false)
:rangeFormatting `(:dynamicRegistration :json-false)
:rename `(:dynamicRegistration :json-false)
:inlayHint `(:dynamicRegistration :json-false)
:publishDiagnostics (list :relatedInformation :json-false
;; TODO: We can support :codeDescription after
;; adding an appropriate UI to
;; Flymake.
:codeDescriptionSupport :json-false
:tagSupport
`(:valueSet
[,@(mapcar
#'car eglot--tag-faces)])))
:window `(:showDocument (:support t)
:workDoneProgress t)
:general (list :positionEncodings ["utf-32" "utf-8" "utf-16"])
:experimental eglot--{})))
(cl-defgeneric eglot-workspace-folders (server)
"Return workspaceFolders for SERVER."
(let ((project (eglot--project server)))
(vconcat
(mapcar (lambda (dir)
(list :uri (eglot-path-to-uri dir)
:name (abbreviate-file-name dir)))
`(,(project-root project) ,@(project-external-roots project))))))
(defclass eglot-lsp-server (jsonrpc-process-connection)
((project-nickname
:documentation "Short nickname for the associated project."
:accessor eglot--project-nickname
:reader eglot-project-nickname)
(languages
:initform nil
:documentation "Alist ((MODE . LANGUAGE-ID-STRING)...) of managed languages."
:accessor eglot--languages)
(capabilities
:initform nil
:documentation "JSON object containing server capabilities."
:accessor eglot--capabilities)
(server-info
:initform nil
:documentation "JSON object containing server info."
:accessor eglot--server-info)
(shutdown-requested
:initform nil
:documentation "Flag set when server is shutting down."
:accessor eglot--shutdown-requested)
(project
:initform nil
:documentation "Project associated with server."
:accessor eglot--project)
(progress-reporters