emacsd/lib/init-rust.el

;; Rust config
(require 'rust-mode)
(add-to-list 'auto-mode-alist '("\\.rs\\'" . rust-mode))
(setq rust-format-on-save t)

(add-hook 'rust-mode-hook 'cargo-minor-mode)

;; (with-eval-after-load 'rust-mode
;;   (add-hook 'flycheck-mode-hook #'flycheck-rust-setup))
;; (add-hook 'rust-mode-hook #'racer-mode)
;; (add-hook 'racer-mode-hook #'eldoc-mode)
;; (add-hook 'racer-mode-hook #'company-mode)
;; (define-key rust-mode-map (kbd "TAB") #'company-indent-or-complete-common)

;; -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
;; rustic = basic rust-mode + additions

(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)
              ("C-c C-c e" . lsp-rust-analyzer-expand-macro)
              ("C-c C-c d" . dap-hydra)
              ("C-c C-c h" . lsp-ui-doc-glance))
  :config
  ;; 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
  (add-hook 'rustic-mode-hook 'rk/rustic-mode-hook))

(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)
  ;; enable / disable the hints as you prefer:
  (lsp-rust-analyzer-server-display-inlay-hints t)
  (lsp-rust-analyzer-display-lifetime-elision-hints-enable "skip_trivial")
  (lsp-rust-analyzer-display-chaining-hints t)
  (lsp-rust-analyzer-display-lifetime-elision-hints-use-parameter-names nil)
  (lsp-rust-analyzer-display-closure-return-type-hints t)
  (lsp-rust-analyzer-display-parameter-hints nil)
  (lsp-rust-analyzer-display-reborrow-hints nil)
  :config
  (add-hook 'lsp-mode-hook 'lsp-ui-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))

(use-package toml-mode :ensure)

(use-package flycheck :ensure)

;; Rust playground https://github.com/grafov/rust-playground
;; M-x rust-playground -> Type -> Ctrl-RET -> See results -> M-x rust-playground-rm
(require 'rust-playground)

(provide 'init-rust)