175 lines
6.4 KiB
EmacsLisp
175 lines
6.4 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 extendSelection (either bind rust-analyzer-extend-selection to a key, or use expand-region)
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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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;; - lsp-ui doesn't interpret the markdown we return currently and instead displays it raw (https://github.com/emacs-lsp/lsp-ui/issues/220 )
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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;; resulting in outdated completions.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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(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 (assq-delete-all "rust" company-lsp--snippet-functions)))
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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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;; extend selection
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(defun rust-analyzer-extend-selection ()
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(interactive)
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(-let (((&hash "start" "end") (rust-analyzer--extend-selection)))
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(rust-analyzer--goto-lsp-loc start)
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(set-mark (point))
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(rust-analyzer--goto-lsp-loc end)
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(exchange-point-and-mark)))
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(defun rust-analyzer--extend-selection-params ()
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"Extend selection params."
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(list :textDocument (lsp--text-document-identifier)
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:selections
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(vector
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(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--extend-selection ()
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(->
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(lsp-send-request
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(lsp-make-request
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"rust-analyzer/extendSelection"
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(rust-analyzer--extend-selection-params)))
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(ht-get "selections")
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(seq-first)))
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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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'(rust-analyzer-extend-selection))))
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(with-eval-after-load 'expand-region
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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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(provide 'ra-emacs-lsp)
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;;; ra-emacs-lsp.el ends here
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