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To use ruby-mode, inf-ruby and rubydb in Emacs/XEmacs, add the
following lines to your ~/.emacs:

;; Taken from the comment section in inf-ruby.el
(setq ruby-program-name "/usr/local/bin/ruby")
(autoload 'ruby-mode "ruby-mode" "Mode for editing ruby source files")
(add-to-list 'auto-mode-alist '("\\.rb$" . ruby-mode))
(add-to-list 'interpreter-mode-alist '("ruby" . ruby-mode))
(autoload 'run-ruby "inf-ruby" "Run an inferior Ruby process")
(autoload 'inf-ruby-keys "inf-ruby" "Set local key defs for inf-ruby in ruby-mode")
(add-hook 'ruby-mode-hook '(lambda () (inf-ruby-keys)))
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