use poper emacs namespace, move keys to dedicated minor mode

lang/rust.el

@@ -0,0 +1,40 @@
+;;; rust -- summary
+;;; Commentary:
+;;; Code:
+
+(require 'icejam-pkg-prog-mode "$HOME/.emacs.d/pkg/prog-mode.el")
+(require 'icejam-pkg-flycheck "$HOME/.emacs.d/pkg/flycheck.el")
+
+(use-package rust-mode
+  :ensure t
+  :defer t)
+
+(use-package flycheck-rust
+  :ensure t
+  :defer t
+  :requires (rust-mode))
+
+(use-package racer
+  :ensure t
+  :defer t
+  :requires (rust-mode))
+
+(defun activate-rust-mode ()
+  "All things for Rust mode."
+  (interactive)
+  (set-indent 4)
+  (column-enforce-n 99)
+
+  ;; Run LSP
+  (lsp-deferred)
+
+  ;; Company list override
+  (add-to-list (make-local-variable 'company-backends)
+               '(company-capf company-yasnippet)))
+
+(add-hook 'rust-mode-hook 'activate-rust-mode)
+(add-hook 'rust-mode-hook 'flycheck-rust-setup)
+(add-hook 'rust-mode-hook 'racer-mode)
+
+(provide 'icejam-lang-rust)
+;;; rust.el ends here