mkhl

func permutations<Sequence: SequenceType>(items: Sequence) -> [[Sequence.Generator.Element]] {
	return items.reduce([[]]) { (perms, item) in
		return perms.flatMap { perm in
			return (0 ... perm.count).map { i in
				var copy = perm
				copy.insert(item, atIndex: i)
				return copy
			}
		}
	}

mkhl

import PromiseKit

extension CollectionType {
  func traverse<T>(transform: Generator.Element -> Promise<T>) -> Promise<[T]> {
    return Promise { fulfill, reject in
      var accumulator: [T] = []
      var generator = self.generate()
      func recurse() {
        guard let next = generator.next() else {
          fulfill(accumulator)

mkhl

extension Dictionary {
  mutating func merge(other: [Key: Value], by combine: (Value, Value) -> Value) {
    for (key, newValue) in other {
      if let oldValue = self[key] {
        self[key] = combine(oldValue, newValue)
      } else {
        self[key] = newValue
      }
    }
  }

mkhl

extension CollectionType {
  func indexBy<Key: Hashable>(keyFunction: (Generator.Element) -> Key) -> [Key: [Generator.Element]] {
    var map: [Key: [Generator.Element]] = [:]
    for element in self {
      let key = keyFunction(element)
      var elements = map[key] ?? []
      elements.append(element)
      map[key] = elements
    }
    return map

mkhl

extension Array {
  mutating func shuffle() {
    if self.count < 2 { return }
    for i in 0..<self.count {
      let j = Int(arc4random_uniform(UInt32(self.count - i))) + i
      if i != j {
        swap(&self[i], &self[j])
      }
    }
  }

mkhl

Source: <http://enlivend.livejournal.com/36650.html>

mkhl

0 # successful termination 64 # base value for error messages
64 # command line usage error
65 # data format error
66 # cannot open input
67 # addressee unknown
68 # host name unknown
69 # service unavailable
70 # internal software error
71 # system error (e.g., can't fork)
72 # critical OS file missing

mkhl

function cdup {
	local dir=$PWD
	local target=${*:-.git}
	until [ -e "$dir/$target" -o "$dir" = "/" ]; do
		dir="$(dirname "$dir")"
	done
	test -e "$dir/$target" && cd "$dir"
}

function catup {

mkhl

walk "$@" |
sor 'file $file | grep -q Mach-O' |
sor 'otool -L $file | grep -q Cellar/readline/6.1'

mkhl

#!/usr/bin/env python

import fileinput, unicodedata

def convert_char(char):
    try:
        name = unicodedata.name(char)
        name = name.replace('LATIN SMALL LETTER', 'LATIN LETTER SMALL CAPITAL')
        return unicodedata.lookup(name)
    except KeyError: