swannodette

(defn take-until
  ([pred-sentinel in] (take-until pred-sentinel in (chan)))
  ([pred-sentinel in out]
    (go (loop []
          (if-let [v (<! in)]
            (do
              (>! out v)
              (if-not (pred-sentinel v)
                (recur)
                (close! out)))

swannodette

(def cds (collection))

;; interact with database

(go
  (>! (:in cds)
    {:op :create
     :val {:title "Soft Machine Vol. 1"
           :artist "Soft Machine"
           :year 1969}})

ept

How to add syntax-highlighted code to PowerPoint slides (Mac OS)

1. pygmentize -f rtf FILE | pbcopy
2. Paste into TextEdit (in rich text mode: Format → Make Rich Text before pasting), and copy to clipboard again.
3. In PowerPoint, Edit → Paste Special… → Styled Text.

(Pasting RTF directly into PowerPoint doesn't work correctly, at least with PowerPoint 2008 — it extends colour spans longer than it should, and sometimes removes line breaks. Going via TextEdit seems to solve the problem.)

jeremy

We've seen lots of Ruby feature requests about converting an Enumerable to a Hash: to_h, map_hash, map_to, each_with_hash, etc. Let's look at one common, simple case of this.

Building a key/value mapping from a collection of keys is awkward. We commonly see Hash[*collection.map { |element| [element, calculate(element)] }] or collection.each_with_object({}) { |element, hash| hash[element] = calculate(element) }. Both are verbose. They require boilerplate code that's not relevant to the programmer's intent: to associate an enumerable of keys with calculated values.

Ruby has the idea of an association already: a key and value paired together. It's used by Array#assoc to look up a value from a list of pairs and by Hash#assoc to return a key/value pair. Building up a mapping of key/value pairs is associating keys with values.

So! Consider Enumerable#associate which builds a mapping by associating keys with values:

# Associate filenames with URLs. Before:

natan

#!/usr/bin/env ruby

require 'FileUtils'
require 'date'

def create_dir_if_necessary(path)
  Dir.mkdir(path) unless File.directory?(path)
end

desktops_path = File.expand_path("~/Dropbox/Documents/Desktops")

cgrand

;; I could have used a closed dispatch (aka cond) but you may find this version more enjoyable
;; the spec format is the one provided by BG

(defprotocol Selector
  (-select [s m]))

(defn select [m selectors-coll]
  (reduce conj {} (map #(-select % m) selectors-coll)))

(extend-protocol Selector

brookr

A: # If using naked domain redirects via Google
216.239.32.21
216.239.34.21
216.239.36.21
216.239.38.21

MX: # If using Google Mail
1 ASPMX.L.GOOGLE.COM.
5 ALT1.ASPMX.L.GOOGLE.COM.
5 ALT2.ASPMX.L.GOOGLE.COM.

wycats

Routing in Ember

In Ember, the application's state manager handles routing. Let's take a look at a simple example:

App.stateManager = Ember.StateManager.create({
  start: Ember.State.extend({
    index: Ember.State.extend({
      route: "/",

erikh

#!/usr/bin/env sh

##
# This is script with usefull tips taken from:
#   https://github.com/mathiasbynens/dotfiles/blob/master/.osx
#
# install it:
#   curl -sL https://raw.github.com/gist/2108403/hack.sh | sh
#

marcel

#!/usr/bin/env ruby

# giftube – Generates an animated gif from a YouTube url.
#
# Usage:
#
#   giftube [youtube url] [minute:second] [duration]
#
#   ex.
#