251 lines
10 KiB
EmacsLisp
251 lines
10 KiB
EmacsLisp
;;; ra-emacs-lsp.el --- Rust analyzer emacs bindings for emacs-lsp -*- lexical-binding: t; -*-
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;;; Code:
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(require 'lsp)
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(require 'dash)
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(require 'ht)
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;; This currently
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;; - sets up rust-analyzer with emacs-lsp, giving
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;; - code actions
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;; - completion (use company-lsp for proper snippet support)
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;; - imenu support
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;; - on-type formatting
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;; - 'hover' type information & documentation (with lsp-ui)
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;; - implements source changes (for code actions etc.), except for file system changes
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;; - implements joinLines (you need to bind rust-analyzer-join-lines to a key)
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;; - implements selectionRanges (either bind lsp-extend-selection to a key, or use expand-region)
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;; - provides rust-analyzer-inlay-hints-mode for inline type hints
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;; What's missing:
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;; - file system changes in apply-source-change
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;; - semantic highlighting
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;; - onEnter, parentModule, findMatchingBrace
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;; - runnables
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;; - the debugging commands (syntaxTree and analyzerStatus)
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;; - more
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;; Also, there's a problem with company-lsp's caching being too eager, sometimes
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;; resulting in outdated completions.
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(defcustom rust-analyzer-command '("ra_lsp_server")
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""
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:type '(repeat (string)))
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(defconst rust-analyzer--notification-handlers
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'(("rust-analyzer/publishDecorations" . (lambda (_w _p)))))
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(defconst rust-analyzer--action-handlers
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'(("rust-analyzer.applySourceChange" .
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(lambda (p) (rust-analyzer--apply-source-change-command p)))))
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(defun rust-analyzer--uri-filename (text-document)
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(lsp--uri-to-path (gethash "uri" text-document)))
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(defun rust-analyzer--goto-lsp-loc (loc)
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(-let (((&hash "line" "character") loc))
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(goto-line (1+ line))
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(move-to-column character)))
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(defun rust-analyzer--apply-text-document-edit (edit)
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"Like lsp--apply-text-document-edit, but it allows nil version."
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(let* ((ident (gethash "textDocument" edit))
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(filename (rust-analyzer--uri-filename ident))
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(version (gethash "version" ident)))
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(with-current-buffer (find-file-noselect filename)
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(when (or (not version) (= version (lsp--cur-file-version)))
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(lsp--apply-text-edits (gethash "edits" edit))))))
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(defun rust-analyzer--apply-source-change (data)
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;; TODO fileSystemEdits
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(seq-doseq (it (-> data (ht-get "workspaceEdit") (ht-get "documentChanges")))
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(rust-analyzer--apply-text-document-edit it))
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(-when-let (cursor-position (ht-get data "cursorPosition"))
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(let ((filename (rust-analyzer--uri-filename (ht-get cursor-position "textDocument")))
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(position (ht-get cursor-position "position")))
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(find-file filename)
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(rust-analyzer--goto-lsp-loc position))))
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(defun rust-analyzer--apply-source-change-command (p)
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(let ((data (-> p (ht-get "arguments") (seq-first))))
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(rust-analyzer--apply-source-change data)))
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(lsp-register-client
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(make-lsp-client
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:new-connection (lsp-stdio-connection (lambda () rust-analyzer-command))
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:notification-handlers (ht<-alist rust-analyzer--notification-handlers)
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:action-handlers (ht<-alist rust-analyzer--action-handlers)
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:major-modes '(rust-mode)
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:ignore-messages nil
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:server-id 'rust-analyzer))
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(defun rust-analyzer--initialized? ()
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(when-let ((workspace (lsp-find-workspace 'rust-analyzer (buffer-file-name))))
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(eq 'initialized (lsp--workspace-status workspace))))
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(with-eval-after-load 'company-lsp
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;; company-lsp provides a snippet handler for rust by default that adds () after function calls, which RA does better
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(setq company-lsp--snippet-functions (cl-delete "rust" company-lsp--snippet-functions :key #'car :test #'equal)))
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;; join lines
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(defun rust-analyzer--join-lines-params ()
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"Join lines params."
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(list :textDocument (lsp--text-document-identifier)
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:range (if (use-region-p)
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(lsp--region-to-range (region-beginning) (region-end))
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(lsp--region-to-range (point) (point)))))
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(defun rust-analyzer-join-lines ()
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(interactive)
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(->
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(lsp-send-request (lsp-make-request "rust-analyzer/joinLines"
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(rust-analyzer--join-lines-params)))
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(rust-analyzer--apply-source-change)))
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;; selection ranges
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(defun rust-analyzer--add-er-expansion ()
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(make-variable-buffer-local 'er/try-expand-list)
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(setq er/try-expand-list (append
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er/try-expand-list
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'(lsp-extend-selection))))
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(with-eval-after-load 'expand-region
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;; add the expansion for all existing rust-mode buffers. If expand-region is
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;; loaded lazily, it might be loaded when the first rust buffer is opened, and
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;; then it's too late for the hook for that buffer
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(dolist (buf (buffer-list))
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(with-current-buffer buf
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(when (eq 'rust-mode major-mode)
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(rust-analyzer--add-er-expansion))))
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(add-hook 'rust-mode-hook 'rust-analyzer--add-er-expansion))
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;; runnables
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(defvar rust-analyzer--last-runnable nil)
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(defun rust-analyzer--runnables-params ()
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(list :textDocument (lsp--text-document-identifier)
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:position (lsp--cur-position)))
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(defun rust-analyzer--runnables ()
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(lsp-send-request (lsp-make-request "rust-analyzer/runnables"
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(rust-analyzer--runnables-params))))
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(defun rust-analyzer--select-runnable ()
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(lsp--completing-read
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"Select runnable:"
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(if rust-analyzer--last-runnable
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(cons rust-analyzer--last-runnable (rust-analyzer--runnables))
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(rust-analyzer--runnables))
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(-lambda ((&hash "label")) label)))
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(defun rust-analyzer-run (runnable)
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(interactive (list (rust-analyzer--select-runnable)))
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(-let (((&hash "env" "bin" "args" "label") runnable))
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(compilation-start
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(string-join (append (list bin) args '()) " ")
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;; cargo-process-mode is nice, but try to work without it...
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(if (functionp 'cargo-process-mode) 'cargo-process-mode nil)
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(lambda (_) (concat "*" label "*")))
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(setq rust-analyzer--last-runnable runnable)))
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(defun rust-analyzer-rerun (&optional runnable)
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(interactive (list (or rust-analyzer--last-runnable
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(rust-analyzer--select-runnable))))
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(rust-analyzer-run (or runnable rust-analyzer--last-runnable)))
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;; analyzer status buffer
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(define-derived-mode rust-analyzer-status-mode special-mode "Rust-Analyzer-Status"
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"Mode for the rust-analyzer status buffer.")
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(defvar-local rust-analyzer--status-buffer-workspace nil)
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(defun rust-analyzer-status ()
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"Displays status information for rust-analyzer."
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(interactive)
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(let* ((workspace (lsp-find-workspace 'rust-analyzer (buffer-file-name)))
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(buf (get-buffer-create (concat "*rust-analyzer status " (with-lsp-workspace workspace (lsp-workspace-root)) "*"))))
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(with-current-buffer buf
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(rust-analyzer-status-mode)
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(setq rust-analyzer--status-buffer-workspace workspace)
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(rust-analyzer-status-buffer-refresh))
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(pop-to-buffer buf)))
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(defun rust-analyzer-status-buffer-refresh ()
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(interactive)
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(when rust-analyzer--status-buffer-workspace
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(let ((inhibit-read-only t))
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(erase-buffer)
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(insert (with-lsp-workspace rust-analyzer--status-buffer-workspace
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(lsp-send-request (lsp-make-request
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"rust-analyzer/analyzerStatus")))))))
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(defun rust-analyzer--syntax-tree-params ()
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"Syntax tree params."
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(list :textDocument (lsp--text-document-identifier)
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:range (if (use-region-p)
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(lsp--region-to-range (region-beginning) (region-end))
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(lsp--region-to-range (point-min) (point-max)))))
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(defun rust-analyzer-syntax-tree ()
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"Displays syntax tree for current buffer."
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(interactive)
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(when (eq 'rust-mode major-mode)
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(let* ((workspace (lsp-find-workspace 'rust-analyzer (buffer-file-name)))
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(buf (get-buffer-create (concat "*rust-analyzer syntax tree " (with-lsp-workspace workspace (lsp-workspace-root)) "*"))))
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(when workspace
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(let ((parse-result (with-lsp-workspace workspace
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(lsp-send-request (lsp-make-request
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"rust-analyzer/syntaxTree"
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(rust-analyzer--syntax-tree-params))))))
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(with-current-buffer buf
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(let ((inhibit-read-only t))
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(erase-buffer)
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(insert parse-result)))
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(pop-to-buffer buf))))))
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;; inlay hints
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(defun rust-analyzer--update-inlay-hints (buffer)
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(if (and (rust-analyzer--initialized?) (eq buffer (current-buffer)))
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(lsp-send-request-async
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(lsp-make-request "rust-analyzer/inlayHints"
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(list :textDocument (lsp--text-document-identifier)))
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(lambda (res)
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(remove-overlays (point-min) (point-max) 'rust-analyzer--inlay-hint t)
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(dolist (hint res)
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(-let* (((&hash "range" "label" "kind") hint)
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((beg . end) (lsp--range-to-region range))
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(overlay (make-overlay beg end)))
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(overlay-put overlay 'rust-analyzer--inlay-hint t)
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(overlay-put overlay 'evaporate t)
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(overlay-put overlay 'after-string (propertize (concat ": " label)
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'font-lock-face 'font-lock-comment-face)))))
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'tick))
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nil)
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(defvar-local rust-analyzer--inlay-hints-timer nil)
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(defun rust-analyzer--inlay-hints-change-handler (&rest rest)
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(when rust-analyzer--inlay-hints-timer
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(cancel-timer rust-analyzer--inlay-hints-timer))
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(setq rust-analyzer--inlay-hints-timer
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(run-with-idle-timer 0.1 nil #'rust-analyzer--update-inlay-hints (current-buffer))))
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(define-minor-mode rust-analyzer-inlay-hints-mode
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"Mode for showing inlay hints."
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nil nil nil
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(cond
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(rust-analyzer-inlay-hints-mode
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(rust-analyzer--update-inlay-hints (current-buffer))
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(add-hook 'lsp-after-initialize-hook #'rust-analyzer--inlay-hints-change-handler nil t)
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(add-hook 'after-change-functions #'rust-analyzer--inlay-hints-change-handler nil t))
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(t
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(remove-overlays (point-min) (point-max) 'rust-analyzer--inlay-hint t)
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(remove-hook 'lsp-after-initialize-hook #'rust-analyzer--inlay-hints-change-handler t)
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(remove-hook 'after-change-functions #'rust-analyzer--inlay-hints-change-handler t))))
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(provide 'ra-emacs-lsp)
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;;; ra-emacs-lsp.el ends here
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