This document will serve as an (opinionated) guide for setting up Racket and Emacs on a Mac OS X. If you are on a Windows machine, @jasonhemann's note should help.

1. Download the latest version of Racket from http://download.racket-lang.org/. Make sure you choose "Racket" as the distribution; the platform should probably just be "Mac OS X (Intel 64-bit)".
2. Open the downloaded racket-blabla.dmg. Drag the entire Racket v6.x.x folder to Applications as instructed.
3. Add racket and raco to your $PATH so that they can be easily found.
   • Edit your ~/.bash_profile (or ~/.zshrc if you use zsh). Run the following line in your terminal:
   • echo 'export PATH="/Applications/Racket v6.4/bin":$PATH' >> ~/.bash_profile
     • As of February 2016, the latest version of Racket is v6.4; if you download a newer version of Racket, make sure you to edit the version above.
4. Activate these changes. Open a terminal window — Mac comes with Terminal.app by default; it's not bad but iTerm2 is a better and free alternative.
   • Run the following commands in your terminal:
   • source ~/.bash_profile
   • echo "(require xrepl)" > ~/.racketrc (Optional, but recommended. This will enable Racket's XREPL in the command line)
5. Try running racket in your terminal. You should be able to see a working REPL.

There are quite a few Emacs versions for Mac. However, the most handy one I've found is Yamamoto Mitsuharu's port: a GitHub mirror of it can be found here. The following part will be a walk-through of installing it via brew (a package manager for Mac that just works™). You may also grab the pre-built binary files from https://github.com/railwaycat/mirror-emacs-mac/releases, but updating it won't be as convenient as using brew.

1. Get brew.

• Go to http://brew.sh/
• Follow the instruction (paste the one-liner at a terminal prompt).

2. Update brew.

• brew update

3. Install Emacs via brew.

• brew tap railwaycat/emacsmacport
• brew install emacs-mac (or brew install emacs-mac --with-modern-icon if you don't like the default icon)
• brew linkapps emacs-mac

4. You should be able to find Emacs.app in your Applications folder.
5. If you want to be able to launch GUI Emacs via the terminal, add alias e='open -a /Applications/Emacs.app' to your .bash_profile.
6. In the future, to upgrade your Emacs, run brew update && brew upgrade emacs-mac.

Configuring Emacs from scratch could take you a loooong time. For your convenience, we've uploaded a minimal init.el file that provides some basic functionalities (for racket-mode) and fixes.

1. Grab the file init.el from this repo
2. Put it in the ~/.emacs.d/ folder
3. Restart your Emacs.app and wait for it to install packages (warnings are normal).

• Automatic package installation, including:
  • racket-mode for all the greatness.
    • We rebind the racket-run command to meta-enter (option-enter). This is basically equivalent with DrRacket's Run button. If you don't like the keybinding, just modify it in init.el.
  • helm cuz nobody can memorize all the emacs functions.
  • company for auto completion.
  • rainbow-delimiters so we won't need to get LASIK.
  • paredit is included but disabled by default.
    • We highly recommend activating paredit for Scheme/Racket/Lisp modes, but we understand that it could take a while to get used to it.
    • Please read http://danmidwood.com/content/2014/11/21/animated-paredit.html first; when you are ready, change the line (setq paredit-enabled nil) to (setq paredit-enabled t) in init.el to activate paredit.
• Fixes
  • All the temporary files will be placed under ~/.emacs.d/bkup so you won't see annoying bla~ files in your working folder again.
  • The Mac option key becomes meta.
  • Perserve some OS X default system shortcuts in Emacs. To name a few:
    • Command-a = "Select All"
    • Command-x = "Cut", Command-c = "Copy", and Command-v = "Paste"
    • Command-s = "Save"
    • Command-z = "Undo"
  • recentf-mode: use C-x C-r to access a list of recently edited files.
  • Emacs grabs the $PATH variable from your shell.

That's it! Now you when you open a .rkt file, racket-mode will start working. The shortcut option-enter acts like DrRacket's Run button — make some changes, press option-enter, and you'll see some new stuff in the REPL.

Customizing Emacs is beyond the scope of this guide. You'll find tons of information on http://emacswiki.org/ and stackoverflow. http://emacsrocks.com/ also has some good staff to watch.

Feel free to modify the init.el file (it's fun!). For more questions, please open a GitHub issue here: https://github.com/keyanzhang/c311-get-started/issues. If you find a better way to do things, pull requests are more than welcome!

MIT