inf-ruby 2.4.0 (new formula)

Closes #14.

Formula/inf-ruby.rb

@@ -0,0 +1,35 @@
+require File.expand_path("../../Homebrew/emacs_formula", __FILE__)
+
+class InfRuby < EmacsFormula
+  desc "Emacs REPL buffer connected to a Ruby subprocess"
+  homepage "https://github.com/nonsequitur/inf-ruby"
+  url "https://github.com/nonsequitur/inf-ruby/archive/2.4.0.tar.gz"
+  sha256 "39e847194d813b00f242e6d04a9bc1169cab5181212c5f69b8f1afa59df2bdc0"
+  head "https://github.com/nonsequitur/inf-ruby.git"
+
+  depends_on :emacs
+
+  def install
+    byte_compile "inf-ruby.el"
+    (share/"emacs/site-lisp/inf-ruby").install "inf-ruby.el",
+                                               "inf-ruby.elc"
+  end
+
+  def caveats; <<-EOS.undent
+    Add the following to your init file:
+
+    (require 'inf-ruby)
+    (autoload 'inf-ruby-minor-mode "inf-ruby" "Run an inferior Ruby process" t)
+    (add-hook 'ruby-mode-hook 'inf-ruby-minor-mode)
+  EOS
+  end
+
+  test do
+    (testpath/"test.el").write <<-EOS.undent
+      (add-to-list 'load-path "#{share}/emacs/site-lisp/inf-ruby")
+      (load "inf-ruby")
+      (print (minibuffer-prompt-width))
+    EOS
+    assert_equal "0", shell_output("emacs -Q --batch -l #{testpath}/test.el").strip
+  end
+end