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core.clj
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core.clj
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(ns fickle.core
(:require [fickle.utils :as utils]))
(def ^:dynamic local-redefinitions {})
(defn current->original-definition
[v]
(when (var? v)
(get (meta v) :original)))
(defn var->redefiniton-fn
[a-var]
(fn [& args]
(let [original-f (current->original-definition a-var)
current-f (get local-redefinitions
a-var
original-f)]
(try
(let [result (apply current-f args)]
result)
(catch Exception e
(throw e))))))
(defn dynamic-redefs
[vars func]
(let [un-redefs (remove #(:already-bound? (meta %)) vars)]
(doseq [a-var un-redefs]
(locking a-var
(when-not (:already-bound? (meta a-var))
(let [old-val (.getRawRoot ^clojure.lang.Var a-var)
metadata {:already-bound? true
:original old-val}]
(.bindRoot ^clojure.lang.Var a-var
(with-meta (var->redefiniton-fn a-var) metadata))
(alter-meta! a-var
(fn [m]
(merge m metadata))))))))
(func))
(defmacro with-dynamic-redefs
[bindings & body]
(let [map-bindings (utils/xs->map bindings)]
`(let [old-rebindings# local-redefinitions]
(binding [local-redefinitions (merge old-rebindings# ~map-bindings)]
(dynamic-redefs ~(vec (keys map-bindings))
(fn [] ~@body))))))