mirror of
https://github.com/rust-lang/rust-analyzer
synced 2024-11-16 01:38:13 +00:00
87 lines
2.8 KiB
EmacsLisp
87 lines
2.8 KiB
EmacsLisp
|
;;; ra.el --- Rust analyzer emacs bindings -*- lexical-binding: t; -*-
|
||
|
|
;;; Commentary:
|
||
|
|
;;; Small utilities for interacting with Rust analyzer.
|
||
|
|
;;; Run
|
||
|
|
;;; cargo install --git https://github.com/matklad/rust-analyzer/ --bin ra_cli
|
||
|
|
;;; to install the binary, copy-paste the bellow code to your `.init.el` and use
|
||
|
|
;;; `ra-extend-selection` and `ra-shrink-selection` functions
|
||
|
|
;;; Code:
|
||
|
|
|
||
|
|
|
||
|
|
(defvar ra--selections-cache '(0 0 ()))
|
||
|
|
(defun ra--cache-tick ()
|
||
|
|
"Get buffer modification count for cache."
|
||
|
|
(nth 0 ra--selections-cache))
|
||
|
|
(defun ra--cache-sel ()
|
||
|
|
"Get current selection for cache."
|
||
|
|
(nth 1 ra--selections-cache))
|
||
|
|
(defun ra--cache-nth-sel (n)
|
||
|
|
"Get Nth selection."
|
||
|
|
(nth n (nth 2 ra--selections-cache)))
|
||
|
|
(defun ra--cache-set-nth-sel (n)
|
||
|
|
"Get Nth selection."
|
||
|
|
(setf (nth 1 ra--selections-cache) n)
|
||
|
|
(nth n (nth 2 ra--selections-cache)))
|
||
|
|
|
||
|
|
|
||
|
|
(defun ra-extend-selection ()
|
||
|
|
"Extend START END region to contain the encompassing syntactic construct."
|
||
|
|
(interactive)
|
||
|
|
(let* ((p (point))
|
||
|
|
(m (or (and mark-active (mark)) p))
|
||
|
|
(start (min p m))
|
||
|
|
(end (max p m)))
|
||
|
|
(ra--extend-selection start end)))
|
||
|
|
|
||
|
|
|
||
|
|
(defun ra-shrink-selection (start end)
|
||
|
|
"Shrink START END region to contain previous selection."
|
||
|
|
(interactive "r")
|
||
|
|
(ra--freshen-cache start end)
|
||
|
|
(let ((sel-id (ra--cache-sel)))
|
||
|
|
(if (not (= 0 sel-id))
|
||
|
|
(let* ((r (ra--cache-set-nth-sel (- sel-id 1))))
|
||
|
|
(push-mark (nth 0 r) t t)
|
||
|
|
(goto-char (nth 1 r))
|
||
|
|
(setq deactivate-mark nil)))))
|
||
|
|
|
||
|
|
; Add this to setup keybinding
|
||
|
|
; (require 'rust-mode)
|
||
|
|
; (define-key rust-mode-map (kbd "C-w") 'ra-extend-selection)
|
||
|
|
; (define-key rust-mode-map (kbd "C-S-w") 'ra-shrink-selection)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
(defun ra--extend-selection (start end)
|
||
|
|
"Extend START END region to contain the encompassing syntactic construct."
|
||
|
|
(ra--freshen-cache start end)
|
||
|
|
(let* ((next-sel-idx (+ 1 (ra--cache-sel)))
|
||
|
|
(r (ra--cache-set-nth-sel next-sel-idx)))
|
||
|
|
(push-mark (nth 0 r) t t)
|
||
|
|
(goto-char (nth 1 r))
|
||
|
|
(setq deactivate-mark nil)))
|
||
|
|
|
||
|
|
(defun ra--selections (start end)
|
||
|
|
"Get list of selections for START END from Rust analyzer."
|
||
|
|
(read (with-output-to-string
|
||
|
|
(call-process-region
|
||
|
|
(point-min) (point-max)
|
||
|
|
"ra_cli" nil standard-output nil
|
||
|
|
"extend-selection"
|
||
|
|
(number-to-string start)
|
||
|
|
(number-to-string end)))))
|
||
|
|
|
||
|
|
(defun ra--freshen-cache (start end)
|
||
|
|
"Make selection cache up-to-date for current buffer state and START END."
|
||
|
|
(if (not (and
|
||
|
|
(= (buffer-modified-tick) (ra--cache-tick))
|
||
|
|
(equal `(,start ,end) (ra--cache-nth-sel (ra--cache-sel)))))
|
||
|
|
(ra--set-cache start end)))
|
||
|
|
|
||
|
|
(defun ra--set-cache (start end)
|
||
|
|
"Set selections cache for current buffer state and START END."
|
||
|
|
(setq ra--selections-cache `(,(buffer-modified-tick) 0 ,(ra--selections start end))))
|
||
|
|
|
||
|
|
(provide 'ra)
|
||
|
|
;;; ra.el ends here
|