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;;; ra-emacs-lsp.el --- Rust analyzer emacs bindings for emacs-lsp -*- lexical-binding: t; -*-
;;; Code:
(require 'lsp)
(require 'dash)
(require 'ht)
;; This currently
;; - sets up rust-analyzer with emacs-lsp, giving
;; - code actions
;; - completion (use company-lsp for proper snippet support)
;; - imenu support
;; - on-type formatting
;; - 'hover' type information & documentation (with lsp-ui)
;; - implements source changes (for code actions etc.), except for file system changes
;; - implements joinLines (you need to bind rust-analyzer-join-lines to a key)
;; - implements extendSelection (either bind rust-analyzer-extend-selection to a key, or use expand-region)
;; What's missing:
;; - file system changes in apply-source-change
;; - semantic highlighting
;; - onEnter, parentModule, findMatchingBrace
;; - runnables
;; - the debugging commands (syntaxTree and analyzerStatus)
;; - lsp-ui doesn't interpret the markdown we return currently and instead displays it raw (https://github.com/emacs-lsp/lsp-ui/issues/220 )
;; - more
;; Also, there's a problem with company-lsp's caching being too eager, sometimes
;; resulting in outdated completions.
(defcustom rust-analyzer-command '("ra_lsp_server")
""
:type '(repeat (string)))
(defconst rust-analyzer--notification-handlers
'(("rust-analyzer/publishDecorations" . (lambda (_w _p)))))
(defconst rust-analyzer--action-handlers
'(("rust-analyzer.applySourceChange" .
(lambda (p) (rust-analyzer--apply-source-change-command p)))))
(defun rust-analyzer--uri-filename (text-document)
(lsp--uri-to-path (gethash "uri" text-document)))
(defun rust-analyzer--goto-lsp-loc (loc)
(-let (((&hash "line" "character") loc))
(goto-line (1+ line))
(move-to-column character)))
(defun rust-analyzer--apply-text-document-edit (edit)
"Like lsp--apply-text-document-edit, but it allows nil version."
(let* ((ident (gethash "textDocument" edit))
(filename (rust-analyzer--uri-filename ident))
(version (gethash "version" ident)))
(with-current-buffer (find-file-noselect filename)
(when (or (not version) (= version (lsp--cur-file-version)))
(lsp--apply-text-edits (gethash "edits" edit))))))
(defun rust-analyzer--apply-source-change (data)
;; TODO fileSystemEdits
(--each (-> data (ht-get "workspaceEdit") (ht-get "documentChanges"))
(rust-analyzer--apply-text-document-edit it))
(-when-let (cursor-position (ht-get data "cursorPosition"))
(let ((filename (rust-analyzer--uri-filename (ht-get cursor-position "textDocument")))
(position (ht-get cursor-position "position")))
(find-file filename)
(rust-analyzer--goto-lsp-loc position)
)))
(defun rust-analyzer--apply-source-change-command (p)
(let ((data (-> p (ht-get "arguments") (car))))
(rust-analyzer--apply-source-change data)))
(lsp-register-client
(make-lsp-client
:new-connection (lsp-stdio-connection (lambda () rust-analyzer-command))
:notification-handlers (ht<-alist rust-analyzer--notification-handlers)
:action-handlers (ht<-alist rust-analyzer--action-handlers)
:major-modes '(rust-mode)
:ignore-messages nil
:server-id 'rust-analyzer))
(defun rust-analyzer--join-lines-params ()
"Join lines params."
(list :textDocument (lsp--text-document-identifier)
:range (if (use-region-p)
(lsp--region-to-range (region-beginning) (region-end))
(lsp--region-to-range (point) (point)))))
(defun rust-analyzer-join-lines ()
(interactive)
(->
(lsp-send-request (lsp-make-request "rust-analyzer/joinLines"
(rust-analyzer--join-lines-params)))
(rust-analyzer--apply-source-change)))
(with-eval-after-load 'company-lsp
;; company-lsp provides a snippet handler for rust by default that adds () after function calls, which RA does better
(setq company-lsp--snippet-functions (assq-delete-all "rust" company-lsp--snippet-functions)))
;; extend selection
(defun rust-analyzer-extend-selection ()
(interactive)
(-let (((&hash "start" "end") (rust-analyzer--extend-selection)))
(rust-analyzer--goto-lsp-loc start)
(set-mark (point))
(rust-analyzer--goto-lsp-loc end)
(exchange-point-and-mark)))
(defun rust-analyzer--extend-selection-params ()
"Extend selection params."
(list :textDocument (lsp--text-document-identifier)
:selections
(vector
(if (use-region-p)
(lsp--region-to-range (region-beginning) (region-end))
(lsp--region-to-range (point) (point))))))
(defun rust-analyzer--extend-selection ()
(->
(lsp-send-request
(lsp-make-request
"rust-analyzer/extendSelection"
(rust-analyzer--extend-selection-params)))
(ht-get "selections")
(car)))
(defun rust-analyzer--add-er-expansion ()
(make-variable-buffer-local 'er/try-expand-list)
(setq er/try-expand-list (append
er/try-expand-list
'(rust-analyzer-extend-selection))))
(with-eval-after-load 'expand-region
(add-hook 'rust-mode-hook 'rust-analyzer--add-er-expansion))
(provide 'ra-emacs-lsp)
;;; ra-emacs-lsp.el ends here
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