73 lines
2 KiB
Clojure
73 lines
2 KiB
Clojure
(ns swank.util
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(:import (java.io StringReader)
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(clojure.lang LineNumberingPushbackReader)))
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(defmacro one-of?
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"Short circuiting value comparison."
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([val & possible]
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(let [v (gensym)]
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`(let [~v ~val]
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(or ~@(map (fn [p] `(= ~v ~p)) possible))))))
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(defn find-first
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"Returns the first entry in a coll matches a given predicate."
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([coll] (find-first identity coll))
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([pred coll]
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(first (filter pred coll))))
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(defn position
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"Finds the first position of an item that matches a given predicate
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within col. Returns nil if not found. Optionally provide a start
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offset to search from."
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([pred coll] (position pred coll 0))
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([pred coll start]
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(loop [coll (drop start coll), i start]
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(when (seq coll)
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(if (pred (first coll))
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i
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(recur (rest coll) (inc i))))))
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{:tag Integer})
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(when-not (ns-resolve 'clojure.core 'group-by)
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;; TODO: not sure why eval is necessary here; breaks without it.
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(eval '(defn group-by
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"Categorizes elements within a coll into a map based on a function."
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([f coll]
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(reduce
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(fn [ret x]
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(let [k (f x)]
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(assoc ret k (conj (get ret k []) x))))
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{})))))
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(when-not (ns-resolve 'clojure.core 'flatten)
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(eval '(defn flatten [x]
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(filter (complement sequential?)
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(rest (tree-seq sequential? seq x))))))
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(defmacro returning [[var ret] & body]
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`(let [~var ~ret]
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~@body
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~var))
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(defn deep-replace [smap coll]
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(map #(if (or (seq? %) (vector? %))
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(deep-replace smap %)
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%)
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(replace smap coll)))
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(defmacro keep-bindings [bindings f]
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(let [bind-vars (take (count bindings) (repeatedly gensym))]
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`(let [~@(interleave bind-vars bindings)]
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(fn [& args#]
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(binding [~@(interleave bindings bind-vars)]
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(apply ~f args#))))))
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(defmacro continuously [& body]
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`(loop [] ~@body (recur)))
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(defmacro failing-gracefully [& body]
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`(try
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~@body
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(catch Throwable _# nil)))
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