Move move .emacs.d out of configs/shared

Moving all of my Emacs-related files into their own directory at the root of
this repository.

emacs/.emacs.d/wpc/wpc-rust.el

@@ -0,0 +1,34 @@
+;;; wpc-rust.el --- Support Rust language -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Supports my Rust work.
+;;
+;; Dependencies:
+;; - `rustup`
+;; - `rustup component add rust-src`
+;; - `rustup toolchain add nightly && cargo +nightly install racer`
+
+
+;;; Code:
+(use-package racer
+  :config
+  (setq rust-sysroot (->> "~/.cargo/bin/rustc --print sysroot"
+                          shell-command-to-string
+                          s-trim-right))
+  (setq racer-rust-src-path (f-join rust-sysroot "lib/rustlib/src/rust/src"))
+  (add-hook 'racer-mode-hook #'eldoc-mode))
+
+(use-package rust-mode
+  :config
+  (add-hook 'rust-mode-hook #'racer-mode)
+  (add-hook-before-save 'rust-mode-hook #'rust-format-buffer)
+  (define-key rust-mode-map
+    (kbd "TAB")
+    #'company-indent-or-complete-common)
+  (define-key rust-mode-map
+    (kbd "M-d")
+    #'racer-describe))
+
+(provide 'wpc-rust)
+;;; wpc-rust.el ends here