algal

// known-good: Xcode 8.1, Swift 3

extension String {
  func keepingCharacters(inCharacterSet allowedCharacters:CharacterSet) -> String {
    var filteredString:String = ""
    var rangeToCheck:Range<String.Index> = self.startIndex..<self.endIndex
    
    while true {
      if let allowedCharRange = self.rangeOfCharacter(from: allowedCharacters,
                                                   options: [],

algal

// known-good: Xcode 8, Swift 3

import Foundation

var standardError = FileHandle.standardError

extension FileHandle : TextOutputStream {
  public func write(_ string: String) {
    guard let data = string.data(using: .utf8) else { return }

algal

// kg: Xcode 8, Swift 3

extension FileHandle : TextOutputStream {
  public func write(_ string: String) {
    guard let data = string.data(using: .utf8) else { return }
    self.write(data)
  }
}

// now something like:

algal

// known-good. Xcode 8, Swift 3

import XCPlayground

/// writes string s to a file in the playground shared directory and returns its URL
func write(string s:String, toPlaygroundSharedDataDirectoryFileWithName name:String) -> URL?
{
  let dirURL:URL = XCPlaygroundSharedDataDirectoryURL as URL
  let fileURL:URL = dirURL.appendingPathComponent(name)
  let path = fileURL.path

algal

import UIKit
import AVFoundation

  /** Returns a UIImageOrientation that will adjust an image
  
   - parameter deviceOrientation: physical orientation of the device when the image was captured. Must not be FaceUp or FaceDown
   - parameter position: position of the camera used for capture. Must be .Front or .Back
   
   - returns an UIImageOrientation, which can be used when initializing a UIImageView.
   

algal

// overloading on function return values to 
// enable destructuring a JSON-like type 

import Foundation

enum JSONType {
  case JBool(Bool)
  case JNumber(Int)
  case JString(String)
}

algal

//
//  SettledownTimer.swift
//
//
//  Created by Alexis Gallagher
//  known-good: Swift 2.2, Xcode 7.3.1
//

import Foundation

algal

#!/bin/sh

command -v carthage >/dev/null 2>&1 || { echo >&2 "I require carthage but it's not installed.  Aborting."; exit 1; }

carthage update --no-build

# A policy proposal:
# 
# We use the "carthage" tool only to download the source code of
# third-party libraries that we depend on.

algal

extension NSURL {
  /// Appends path components to the receiver, optionally specifying if full path is a directory to avoid filesystem access
  func URLByAppendingPathComponents(pathComponents:[String],lastIsDirectory:Bool? = nil) -> NSURL {
    guard pathComponents.isEmpty == false else { return self }
    var newURL = self
    for idx in pathComponents.startIndex..<pathComponents.endIndex.predecessor() {
      newURL = newURL.URLByAppendingPathComponent(pathComponents[idx], isDirectory: true)
    }
    if let last = pathComponents.last {
      if let lastIsDirectory = lastIsDirectory {

algal

// known-good: Xcode 7.3.1, Swift 2.2

/**
 Filters to only those file URLs whose filenames match the glob pattern.
 - parameter fileURLs: file URLs to filter
 - parameter filenameGlobPattern: a glob pattern to match against the filename of the file pointed to by a file URL
 */
func URLsWithFilenamesMatchingGlobPattern(fileURLs:[NSURL],filenameGlobPattern:String) -> [NSURL]
{
  let filenamePredicate = NSPredicate(format: "SELF like %@", argumentArray: [filenameGlobPattern])