Is there a colored REPL for Clojure?

Question

I'd like to get a colored REPL for clojure code, similar to what you can do with IRB for Ruby.

Are there any libraries or settings for user.clj that provide automatic coloring of the REPL?

Example IRB:

Answer 1

Rather late to the party, here, but you can get this from using the Leiningen plugin Ultra (which also has support for colorized stacktraces and pretty-printed test output), or by adding Whidbey to your list of Leiningen plugins instead.

Sample Ultra REPL:

Answer 2

I do not know of any way to have the basic Clojure REPL, as started by something like java -cp clojure.jar clojure.main, do syntax highlighting. If, however, you use Emacs & SLIME (the development environment of choice of a great part of the Clojure community!), then you can have the SLIME REPL highlight syntax like clojure-mode does.

First, you'll have to lift some code from the clojure-mode function (defined towards the top of clojure-mode.el):

;;; all code in this function lifted from the clojure-mode function
;;; from clojure-mode.el
(defun clojure-font-lock-setup ()
  (interactive)
  (set (make-local-variable 'lisp-indent-function)
       'clojure-indent-function)
  (set (make-local-variable 'lisp-doc-string-elt-property)
       'clojure-doc-string-elt)
  (set (make-local-variable 'font-lock-multiline) t)

  (add-to-list 'font-lock-extend-region-functions
               'clojure-font-lock-extend-region-def t)

  (when clojure-mode-font-lock-comment-sexp
    (add-to-list 'font-lock-extend-region-functions
                 'clojure-font-lock-extend-region-comment t)
    (make-local-variable 'clojure-font-lock-keywords)
    (add-to-list 'clojure-font-lock-keywords
                 'clojure-font-lock-mark-comment t)
    (set (make-local-variable 'open-paren-in-column-0-is-defun-start) nil))

  (setq font-lock-defaults
        '(clojure-font-lock-keywords    ; keywords
          nil nil
          (("+-*/.<>=!?$%_&~^:@" . "w")) ; syntax alist
          nil
          (font-lock-mark-block-function . mark-defun)
          (font-lock-syntactic-face-function
           . lisp-font-lock-syntactic-face-function))))

Then add it to the slime-repl-mode-hook:

(add-hook 'slime-repl-mode-hook
          (lambda ()
            (font-lock-mode nil)
            (clojure-font-lock-setup)
            (font-lock-mode t)))

Et voilà, next time you connect to the SLIME REPL you'll have clojure-mode syntax highlighting available. If you use SLIME for Common Lisp too, you'll want to tweak this so it doesn't try to do Clojure highlighting with CL. Also, this is just a first approximation; one thing it sort of breaks is prompt highlighting (the namespace> thing will not be highlighted anymore). I'm not a proficient font-lock hacker by any stretch of the imagination, though, so I'll leave it at that. :-)

Answer 3

If you just want to color the prompt and you are using Leiningen (which you should), you can use :repl-options and ANSI escape sequences:

:repl-options {:prompt (fn [ns]
                         (str "\033[1;32m"
                              ns "=>"
                              "\033[0m "))}

References:

• GitHub – technomancy/leiningen – sample.project.clj
• roguejs.com – “Console colors in node.js”, posted 2011

Answer 4

• Install Emacs 24
• Install Emacs Starter Kit v2
• M-x package-install -> starter-kit-lisp
• Add to init.el: (add-hook 'slime-repl-mode-hook 'clojure-mode-font-lock-setup)
• Install Swank for Clojure
• Open your Clojure project and M-x clojure-jack-in