Chouser

;; As originally posted, circa July 2009: http://web.archive.org/web/20110919081924/http://paste.lisp.org/display/83647

(def *iderefs* #{})

(defmethod print-method clojure.lang.IDeref [o #^Writer w]
  (if (*iderefs* o)
    (.write w (format "#<%s@%x>"
                      (.getSimpleName (class o))
                      (System/identityHashCode o)))
    (binding [*iderefs* (conj *iderefs* o)]

Chouser

(ns n01se.externs-for-cljs
  (:require [clojure.java.io :as io]
            [cljs.compiler :as comp]
            [cljs.analyzer :as ana]))

(defn read-file [file]
  (let [eof (Object.)]
    (with-open [stream (clojure.lang.LineNumberingPushbackReader. (io/reader file))]
      (vec (take-while #(not= % eof)
                       (repeatedly #(read stream false eof)))))))

Chouser

;;** Multi-thread stochastic bubble sort **
;; an example of how to use refs

(defn fizzy-sort-init [coll]
  (mapv #(ref (vector %)) coll))

(defn fizzy-sort-step [refs]
  (let [i (rand-int (dec (count refs)))
        [a b] (map #(nth refs %) (iterate inc i))
        [a-val b-val] (map #(peek (deref %)) [a b])]

Chouser

(defun toggle-tags-invisible ()
  (interactive)
  (save-excursion
    (goto-char (point-min))
    (when (not (remove-text-properties (point-min) (point-max) '(invisible t)))
      (let ((spew (make-progress-reporter "Hiding all tags..." (point-min) (point-max))))
        (while (re-search-forward "</.*?>" nil t)
          (add-text-properties (match-beginning 0) (- (match-end 0) 1) '(invisible t) nil)
          (progress-reporter-update spew (point)))
        (goto-char (point-min))

Chouser

;; Here is a spike of a lightweight in-process pubsub mechanism that allows pure ;; functional consumers, both blocking and asynchronous. 

;; This defines the event stream, in this case just a series of numbers,
;; a new one produced each second
(defn timer []
  (lazy-seq
    (do
      (Thread/sleep 1000)
      (cons (System/nanoTime) (timer)))))

Chouser

(ns foo
  (:import (java.util Properties)
           javax.mail.internet.MimeMessage
           (javax.mail.internet MimeMessage InternetAddress)
           (javax.mail Session Transport Authenticator
           PasswordAuthentication Message$RecipientType)))

(defn send-gmail [{:keys [from to subject text user password]}]
  (let [auth (proxy [Authenticator] []
               (getPasswordAuthentication []

Chouser

(defn stateful-filter [pred event-key cache events]
  (lazy-seq
   (when (seq events)
     (let [event (first events)
           ekey (event-key event)]
       (if (pred (get cache ekey) event)
         (cons event (stateful-filter pred event-key
                                      (assoc cache ekey event) (rest events)))
         (stateful-filter pred event-key cache (rest events)))))))

Chouser

(defn push-wrap [v wrap & args]
  (alter-var-root v #(with-meta (apply wrap % args) {::orig %})))
  
(defn pop-wrap [v]
  (alter-var-root v #(if-let [m (::orig (meta %))] m %)))

(defn post [orig post-printer]
  (fn [& args]
    (let [rtn (apply orig args)]
      (post-printer orig rtn args)

Chouser

// ==ClosureCompiler==
// @compilation_level ADVANCED_OPTIMIZATIONS
// @output_file_name cps-demo.js
// @formatting pretty_print
// ==/ClosureCompiler==

function forEach(coll, f) { 
  for(var i = 0; i < coll.length; ++i) { 
    f(coll[i]);
  } 

Chouser

(defn repeat-string [string num]
  (apply str (repeat num string)))