Integrate rustfmt with emacs.

rust.md

1. Install nightly build of cargo. (rustfmt requires cargo 0.6.0 or newer)

   $ curl -sSf https://static.rust-lang.org/rustup.sh | sh -s -- --channel=nightly

2. Then install rustfmt,

   $ cargo install --git https://github.com/rust-lang-nursery/rustfmt

3. Install emacs-rustfmt

   Add (depends-on "rustfmt") to your Cask file, and run Cask. Or manually add rustfmt.el to your load path.

And install rust-mode

4. Add this to your .emacs (or equivalent) file; to run rustfmt after every save.

(defun my-rust-mode-hooks ()
  (add-hook 'before-save-hook 'rustfmt-format-buffer)
  )
(add-hook 'rust-mode-hook 'my-rust-mode-hooks)

Or, add a keybinding,

(define-key rust-mode-map (kbd "C-c C-f") #'rustfmt-format-buffer)