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eglot.el
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;;; eglot.el --- The Emacs Client for LSP servers -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2025 Free Software Foundation, Inc.
;; Version: 1.18
;; Author: João Távora <[email protected]>
;; Maintainer: João Távora <[email protected]>
;; URL: https://github.com/joaotavora/eglot
;; Keywords: convenience, languages
;; Package-Requires: ((emacs "26.3") (eldoc "1.14.0") (external-completion "0.1") (flymake "1.2.1") (jsonrpc "1.0.24") (project "0.9.8") (seq "2.23") (xref "1.6.2"))
;; 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)
(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
;; For those packages that are preloaded, reload them if needed,
;; since that's the best we can do anyway.
;; FIXME: Maybe the ELPA packages for those preloaded packages should
;; force-reload themselves eagerly when the package is activated!
(let ((reload (if (fboundp 'require-with-check) ;Emacs≥30
#'require-with-check
(lambda (feature &rest _)
;; Just blindly reload like we used to do before
;; `require-with-check'.
(load (symbol-name feature) nil 'nomessage)))))
(funcall reload 'eldoc nil 'reload)
(funcall reload 'seq nil 'reload)
;; For those packages which are not preloaded OTOH, signal an error if
;; the loaded file is not the one that should have been loaded.
(mapc reload '(project flymake xref jsonrpc external-completion))))
;; Keep the eval-when-compile requires at the end, in case it's already been
;; required unconditionally by some earlier `require'.
(eval-when-compile (require 'subr-x))
;; 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")
(make-obsolete-variable 'eglot-events-buffer-size
'eglot-events-buffer-config "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 (LSP) servers."
:prefix "eglot-"
:group 'tools)
(add-to-list 'customize-package-emacs-version-alist
'(Eglot ("1.12" . "29.1")
("1.12" . "29.2")
("1.12" . "29.3")
("1.12.29" . "29.4")
("1.17.30" . "30.1")))
(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 to be invoked
automatically by Eglot on startup. 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 _project)
;; 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 ((and interactive current-prefix-arg)
;; A C-u always lets user input something manually,
nil)
(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
;; FIXME: Maybe this info should be distributed into the major modes
;; themselves where they could set a buffer-local `eglot-server-program'
;; instead of keeping this database centralized.
;; FIXME: With `derived-mode-add-parents' in Emacs≥30, some of
;; those entries can be simplified, but we keep them for when
;; `eglot.el' is installed via GNU ELPA in an older Emacs.
`(((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" ("basedpyright-langserver" "--stdio")
("pyright-langserver" "--stdio")
"jedi-language-server" ("ruff" "server") "ruff-lsp")))
((js-json-mode json-mode json-ts-mode jsonc-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 php-ts-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")
(ocaml-ts-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-ts-mode) . ("kotlin-language-server"))
((go-mode go-dot-mod-mode go-dot-work-mode go-ts-mode go-mod-ts-mode go-work-ts-mode)
. ("gopls"))
((R-mode ess-r-mode) . ("R" "--slave" "-e"
"languageserver::run()"))
((java-mode java-ts-mode)
. ,(eglot-alternatives '("jdtls" "java-language-server")))
((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-ts-mode) . ("ada_language_server"))
((gpr-mode gpr-ts-mode) . ("ada_language_server" "--language-gpr"))
(scala-mode . ,(eglot-alternatives
'("metals" "metals-emacs")))
(racket-mode . ("racket" "-l" "racket-langserver"))
((latex-mode plain-tex-mode context-mode texinfo-mode bibtex-mode tex-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"))
((nushell-mode nushell-ts-mode) . ("nu" "--lsp"))
(gdscript-mode . ("localhost" 6008))
(fennel-mode . ("fennel-ls"))
(move-mode . ("move-analyzer"))
((fortran-mode f90-mode) . ("fortls"))
(futhark-mode . ("futhark" "lsp"))
((lua-mode lua-ts-mode) . ,(eglot-alternatives
'("lua-language-server" "lua-lsp")))
(yang-mode . ("yang-language-server"))
((zig-mode zig-ts-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")
("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"))
(sml-mode
. ,(lambda (_interactive project)
(list "millet-ls" (project-root project))))
((blueprint-mode blueprint-ts-mode) . ("blueprint-compiler" "lsp"))
((odin-mode odin-ts-mode) . ("ols")))
"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 two arguments (INTERACTIVE PROJECT) producing any
of the above values for CONTACT. INTERACTIVE will be t if an
interactive `M-x eglot' was used, and nil otherwise (e.g. from
`eglot-ensure'). Interactive calls may ask the user for hints
on finding the required programs, etc. PROJECT is whatever
project Eglot discovered via `project-find-functions' (which
see). The function should 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-config
(list :size (or (bound-and-true-p eglot-events-buffer-size) 2000000)
:format 'full)
"Configure the Eglot events buffer.
Value is a plist accepting the keys `:size', which controls the
size in characters of the buffer (0 disables, nil means
infinite), and `:format', which controls the shape of each log
entry (`full' includes the original JSON, `lisp' uses
pretty-printed Lisp).
For changes on this variable to take effect, you need to restart
the LSP connection. That can be done by `eglot-reconnect'."
:type '(plist :key-type (symbol :tag "Keyword")
:options (((const :tag "Size" :size)
(choice
(const :tag "No limit" nil)
(integer :tag "Number of characters")))
((const :tag "Format" :format)
(choice
(const :tag "Full with original JSON" full)
(const :tag "Shortened" short)
(const :tag "Pretty-printed lisp" lisp)))))
:package-version '(Eglot . "1.17.30"))
(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))))
:package-version '(Eglot . "1.17.30"))
(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
:package-version '(Eglot . "1.17.30"))
(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.
For changes on this variable to take effect, you need to restart
the LSP connection. That can be done by `eglot-reconnect'."
: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))
:package-version '(Eglot . "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)
(const :tag "Type hierarchies" :typeHierarchyProvider)
(const :tag "Call hierarchies" :callHierarchyProvider)))
(defcustom eglot-advertise-cancellation nil
"If non-nil, Eglot attempts to inform server of canceled requests.
This is done by sending an additional '$/cancelRequest' notification
every time Eglot decides to forget a request. The effect of this
notification is implementation defined, and is only useful for some
servers."
:type 'boolean)
(defface eglot-code-action-indicator-face
'((t (:inherit font-lock-escape-face :weight bold)))
"Face used for code action suggestions.")
(defcustom eglot-code-action-indications
'(eldoc-hint margin)
"How Eglot indicates there's are code actions available at point.
Value is a list of symbols, more than one can be specified:
- `eldoc-hint': ElDoc is used to hint about at-point actions;
- `margin': A special indicator appears in the margin;
- `nearby': A special indicator appears near point;
- `mode-line': A special indicator appears in the mode-line.
If the list is empty, Eglot will not hint about code actions at point.
Note additionally:
- `margin' and `nearby' are incompatible. If both are specified,
the latter takes priority;
- `mode-line' only works if `eglot-mode-line-action-suggestion' exists in
`eglot-mode-line-format' (which see)."
:type '(set
:tag "Tick the ones you're interested in"
(const :tag "ElDoc textual hint" eldoc-hint)
(const :tag "Right besides point" nearby)
(const :tag "In mode line" mode-line)
(const :tag "In margin" margin))
:package-version '(Eglot . "1.19"))
(defcustom eglot-code-action-indicator
(cl-loop for c in '(? ?⚡?✓ ?α ??)
when (char-displayable-p c)
return (make-string 1 c))
"Indicator string for code action suggestions."
:type (let ((basic-choices
(cl-loop for c in '(? ?⚡?✓ ?α ??)
when (char-displayable-p c)
collect `(const :tag ,(format "Use `%c'" c)
,(make-string 1 c)))))
`(choice ,@basic-choices
(string :tag "Specify your own")))
:package-version '(Eglot . "1.19"))
(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--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 0) "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-allowed-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))
(ExecuteCommandParams ((:command . string)) (:arguments))
(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))
(InsertReplaceEdit (:newText :insert :replace))
(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))
;; HACK! 'HierarchyItem' doesn't exist, only `CallHierarchyItem'
;; and `TypeHierarchyItem'. But they're the same, so no bother.
(HierarchyItem (:name :kind)
(:tags :detail :uri :range :selectionRange :data))
(CallHierarchyIncomingCall (:from :fromRanges) ())
(CallHierarchyOutgoingCall (:to :fromRanges) ()))
"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 form &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 `CodeAction', `Command' or `ExecuteCommandParams'
object."
(:method
(server action) "Default implementation."
(eglot--dcase action
(((Command))
;; Convert to ExecuteCommandParams and recurse (bug#71642)
(cl-remf action :title)
(eglot-execute server action))
(((ExecuteCommandParams))
(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
;; Recursive call with what must be a Command object (bug#71642)
(eglot-execute server 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)