128 lines
4.4 KiB
EmacsLisp
128 lines
4.4 KiB
EmacsLisp
;;; ra.el --- Rust analyzer emacs bindings -*- lexical-binding: t; -*-
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;;; Commentary:
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;;; Small utilities for interacting with Rust analyzer.
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;;; Run
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;;; cargo install --git https://github.com/matklad/rust-analyzer/ ra_cli
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;;; to install the analyzer binary. Then copy-paste the bellow code to
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;;; your `.init.el` and use `ra-extend-selection` and
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;;; `ra-shrink-selection` functions.
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;;; Code:
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(defvar ra--selections-cache '(0 0 ()))
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(defun ra--cache-tick ()
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"Get buffer modification count for cache."
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(nth 0 ra--selections-cache))
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(defun ra--cache-sel ()
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"Get current selection for cache."
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(nth 1 ra--selections-cache))
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(defun ra--cache-nth-sel (n)
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"Get Nth selection."
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(nth n (nth 2 ra--selections-cache)))
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(defun ra--cache-set-nth-sel (n)
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"Get Nth selection."
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(setf (nth 1 ra--selections-cache) n)
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(nth n (nth 2 ra--selections-cache)))
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(defun ra-extend-selection ()
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"Extend START END region to contain the encompassing syntactic construct."
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(interactive)
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(let* ((p (point))
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(m (or (and mark-active (mark)) p))
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(start (min p m))
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(end (max p m)))
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(ra--extend-selection start end)))
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(defun ra-shrink-selection (start end)
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"Shrink START END region to contain previous selection."
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(interactive "r")
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(ra--freshen-cache start end)
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(let ((sel-id (ra--cache-sel)))
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(if (not (= 0 sel-id))
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(let* ((r (ra--cache-set-nth-sel (- sel-id 1))))
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(push-mark (nth 0 r) t t)
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(goto-char (nth 1 r))
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(setq deactivate-mark nil)))))
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; Add this to setup keybinding
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; (require 'rust-mode)
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; (define-key rust-mode-map (kbd "C-w") 'ra-extend-selection)
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; (define-key rust-mode-map (kbd "C-S-w") 'ra-shrink-selection)
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(defun ra--extend-selection (start end)
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"Extend START END region to contain the encompassing syntactic construct."
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(ra--freshen-cache start end)
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(let* ((next-sel-idx (+ 1 (ra--cache-sel)))
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(r (ra--cache-set-nth-sel next-sel-idx)))
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(push-mark (nth 0 r) t t)
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(goto-char (nth 1 r))
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(setq deactivate-mark nil)))
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(defun ra--selections (start end)
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"Get list of selections for START END from Rust analyzer."
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(read (with-output-to-string
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(call-process-region
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(point-min) (point-max)
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"ra_cli" nil standard-output nil
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"extend-selection"
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(number-to-string start)
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(number-to-string end)))))
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(defun ra--freshen-cache (start end)
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"Make selection cache up-to-date for current buffer state and START END."
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(if (not (and
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(= (buffer-modified-tick) (ra--cache-tick))
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(equal `(,start ,end) (ra--cache-nth-sel (ra--cache-sel)))))
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(ra--set-cache start end)))
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(defun ra--set-cache (start end)
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"Set selections cache for current buffer state and START END."
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(setq ra--selections-cache `(,(buffer-modified-tick) 0 ,(ra--selections start end))))
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(require 'eglot)
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(require 'ivy)
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(require 'counsel)
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(defun workspace-symbols ()
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(interactive)
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(let ((buf (current-buffer)))
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(ivy-read "Symbol name: "
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(lambda (str)
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(with-current-buffer buf
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(let ((backend (eglot-xref-backend)))
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(mapcar
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(lambda (xref)
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(let ((loc (xref-item-location xref)))
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(propertize
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(concat
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(when (xref-file-location-p loc)
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(with-slots (file line column) loc
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(format "%s:%s:%s:"
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(propertize (file-relative-name file)
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'face 'compilation-info)
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(propertize (format "%s" line)
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'face 'compilation-line
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)
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column)))
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(xref-item-summary xref))
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'xref xref)))
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(xref-backend-apropos backend str))
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)))
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:dynamic-collection t
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:action (lambda (item)
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(xref--pop-to-location (get-text-property 0 'xref item))))))
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(add-to-list 'eglot-server-programs '(rust-mode . ("ra_lsp_server")))
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; (require 'rust-mode)
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; (define-key rust-mode-map (kbd "C-n") 'workspace-symbols)
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(define-key)
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(provide 'ra)
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;;; ra.el ends here
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