emacs: change to rustic from racer

https://robert.kra.hn/posts/2021-02-07_rust-with-emacs/

Sponsored-by: author

1 files changed, 67 insertions, 26 deletions

diff --git a/emacs.d/init.el b/emacs.d/init.el
index 3fa4739..bfc500c 100644
--- a/emacs.d/init.el
+++ b/emacs.d/init.el
@@ -18,7 +18,7 @@
 ;; Run this manually from time to time to update package lists.
 ;(package-refresh-contents)
 
-;; Use-package for civilized configuration
+;; use-package for easier configuration
 
 (unless (package-installed-p 'use-package)
   (package-install 'use-package))
@@ -33,21 +33,30 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Packages I like.
 
+;; Major mode for editing Apache configuration files.
 (use-package apache-mode)
-(use-package blacken)
+
+;; Hide some mode line displays that are just noise.
 (use-package diminish)
-(use-package go-mode)
+
+;; Major mode for GraphViz dot files.
 (use-package graphviz-dot-mode)
 
+;; Use git from Emacs.
 (use-package magit
   :config
   (global-set-key (kbd "C-x g") 'magit-status))
 
+;; Use the black Python source formatter to format Emacs buffers.
+(use-package blacken)
+
+;; Major mode for Python source code.
 (use-package python-mode
   :config
   (py-underscore-word-syntax-p-off)
   (add-hook 'python-mode-hook 'blacken-mode))
 
+;; Major mode for YAML files.
 (use-package yaml-mode
   :config
   (add-to-list 'auto-mode-alist '("\\.ick\\'" . yaml-mode))
@@ -55,51 +64,85 @@
   (add-to-list 'auto-mode-alist '("\\.yaml\\'" . yaml-mode))
   (add-to-list 'auto-mode-alist '("\\.yml\\'" . yaml-mode)))
 
+;; Major mode for Markdown text files.
 (use-package markdown-mode
   :config
   (add-to-list 'auto-mode-alist '("NEWS" . markdown-mode))
   (add-to-list 'auto-mode-alist '("README" . markdown-mode))
   (add-to-list 'auto-mode-alist '("\\.mdwn\\'" . markdown-mode)))
 
-(use-package modus-operandi-theme
-  :config
-  (setq modus-operandi-theme-slanted-constructs t)
-  (setq modus-operandi-theme-bold-constructs t)
-  (load-theme 'modus-operandi t))
-
-(use-package rust-mode
+;; Major mode for edit source code in the Rust language.
+(use-package rustic
+  :ensure
+  :bind (:map rustic-mode-map
+              ("M-j" . lsp-ui-imenu)
+              ("M-?" . lsp-find-references)
+              ("C-c C-c l" . flycheck-list-errors)
+              ("C-c C-c a" . lsp-execute-code-action)
+              ("C-c C-c r" . lsp-rename)
+              ("C-c C-c q" . lsp-workspace-restart)
+              ("C-c C-c Q" . lsp-workspace-shutdown)
+              ("C-c C-c s" . lsp-rust-analyzer-status))
   :config
-  (setq-default rust-format-on-save t)
-  (setq-default rust-rustfmt-bin "~/liw-dot-files/bin/rustfmt-2018"))
-
-(use-package racer
+  ;; uncomment for less flashiness
+  ;; (setq lsp-eldoc-hook nil)
+  ;; (setq lsp-enable-symbol-highlighting nil)
+  ;; (setq lsp-signature-auto-activate nil)
+
+  ;; comment to disable rustfmt on save
+  (setq rustic-format-on-save t))
+
+;; Mode for using the Rust Language Server Protocol for nicer Rust
+;; editing.
+(use-package lsp-mode
+  :ensure
+  :commands lsp
+  :custom
+  ;; what to use when checking on-save. "check" is default, I prefer clippy
+  (lsp-rust-analyzer-cargo-watch-command "clippy")
+  (lsp-eldoc-render-all t)
+  (lsp-idle-delay 0.6)
+  (lsp-rust-analyzer-server-display-inlay-hints t)
   :config
-  ;; https://github.com/racer-rust/emacs-racer/issues/140
-  (setq racer-rust-src-path
-	"/home/liw/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library")
-  (add-hook 'rust-mode-hook #'racer-mode)
-  (add-hook 'racer-mode-hook #'eldoc-mode))
-
+  (add-hook 'lsp-mode-hook 'lsp-ui-mode))
+
+;; UI for lsp-mode.
+(use-package lsp-ui
+  :ensure
+  :commands lsp-ui-mode
+  :custom
+  (lsp-ui-peek-always-show t)
+  (lsp-ui-sideline-show-hover t)
+  (lsp-ui-doc-enable nil))
+
+;; Text completion framework for Emacs.
 (use-package company
   :config
   (setq company-tooltip-align-annotations t)
 ;  (define-key rust-mode-map (kbd "TAB") #'company-indent-or-complete-common)
   (add-hook 'racer-mode-hook #'company-mode))
 
-
+;; Minor mode for on-the-fly checks for various types of files.
 (use-package flycheck
   :config
   (setq-default flycheck-disabled-checkers '(python-pylint)))
 
-
+;; Flycheck for the Rust language.
 (use-package flycheck-rust)
 ;;(with-eval-after-load 'rust-mode
 ;;  (add-hook 'flycheck-mode-hook #'flycheck-rust-setup))
 
+;; Minor mode to color mode line based on how happy flycheck is.
 (use-package flycheck-color-mode-line)
 (eval-after-load 'flycheck
   '(add-hook 'flycheck-mode-hook 'flycheck-color-mode-line-mode))
 
+;; UI theme for Emacs.
+(use-package modus-operandi-theme
+  :config
+  (setq modus-operandi-theme-slanted-constructs t)
+  (setq modus-operandi-theme-bold-constructs t)
+  (load-theme 'modus-operandi t))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; UI tweaks.
@@ -117,9 +160,9 @@
 ;; Show line number before line.
 (global-display-line-numbers-mode)
 (set-face-attribute 'line-number nil
-		    :height 0.7)
+		    :height 0.8)
 (set-face-attribute 'line-number-current-line nil
-		    :foreground "#ff0000" :height 0.7)
+		    :foreground "#ff0000" :height 0.8)
 
 ;; Enable X CLIPBOARD selection, instead of PRIMARY.
 (setq select-enable-clipboard t)
@@ -137,9 +180,7 @@
 (add-hook 'text-mode-hook 'hl-line-mode)
 (add-hook 'prog-mode-hook 'hl-line-mode)
 
-
 ;; Key bindings
-
 (global-set-key (kbd "<f5>") 'compile)
 (global-set-key (kbd "C-<f5>") 'recompile)
 (global-unset-key "\C-x\C-b")