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           | $$                
  /$$$$$$$ | $$    /$$   /$$   /$$
 /$$_____/ | $$   |__/  |  $$ /$$/
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|  $$$$$$$ | $$   | $$   /$$/\  $$
 \_______/ |__/   | $$  |__/  \__/
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            |  $$$$$$/  Your code is, like, data, bro.        

Cljx is a Lein plugin that emits Clojure and ClojureScript code from a single metadata-annotated codebase.

To use it, add it to your project.clj:

:plugins [com.keminglabs/cljx "0.1.0"]
:cljx {:builds [{:source-paths ["src/cljx"]
                 :output-path ".generated/clj"
                 :rules cljx.rules/clj-rules}

                {:source-paths ["src/cljx"]
                 :output-path ".generated/cljs"
                 :extension "cljs"
                 :rules cljx.rules/cljs-rules}]}


:hooks [cljx.hooks]

to automatically run cljx before cutting a JAR.

The included clj and cljs rule sets will remove forms marked with platform-specific metadata and rename protocols as appropriate. E.g., the .cljx source containing

^:clj (ns c2.maths
        (:use [c2.macros :only [combine-with]]))
^:cljs (ns c2.maths
         (:use-macros [c2.macros :only [combine-with]]))

(defn ^:clj sin [x] (Math/sin x))
(defn ^:cljs sin [x] (.sin js/Math x))

  (invoke [_ x] (inc x)))

will, when run through cljx.rules/cljs-rules, yield:

(ns c2.maths
  (:use-macros [c2.macros :only [combine-with]]))

(defn sin [x] (.sin js/Math x))

  (invoke [_ x] (inc x)))

The value associated with :rules is eval'd in the plugin namespace. You can specify your own rules inline, or load from a file:

:rules (load-file "my-rules.clj")

with the file containing, for instance:

(use '[kibit.rules.util :only [compile-rule]])

[(compile-rule '[(+ ?x 1) (inc ?x)])]

Forms that are converted into :cljx.core/exclude will be excluded from the output. See Kibit for more info on writing rules, and C2 for a project that uses .cljx heavily.

Clojure is a hosted language

Cljx does not try to hide implementation differences between host platforms. Clojure has ints, floats, longs, &c., ClojureScript has number; Clojure regular expressions act differently than ClojureScript regular expressions, because they are different.

Cljx only tries to unify Clojure/ClojureScript abstractions when it makes sense. E.g., converting clojure.lang.IFn into IFn when generating ClojureScript.


Emacs users, want syntax highlighting? Add to your emacs config: (add-to-list 'auto-mode-alist '("\\.cljx\\'" . clojure-mode)).


  • CLJS: Remove docstrings from namespaces.


@jonase & @ohpauleez for kibit @swannodette for core.logic

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