kristopherjohnson

import Foundation

/// Given a `String?`, return an `NSNumber` Boolean value that is true if the value is non-nil and not empty.
///
/// This is useful for binding the `enabled` property of a button to a string value that is bound to a text field.

final class IsNotNilOrEmptyValueTransformer: NSValueTransformer {
    
    override class func transformedValueClass() -> AnyClass {
        return NSNumber.self

kristopherjohnson

\ Blink an LED connected to GPIO pin 18
\ 
\ Must be run with root/sudo. For example: "sudo gforth blink.fs"

require wiringPi.fs

wiringPiSetupGpio drop

18 constant ledPin
ledPin OUTPUT pinMode

kristopherjohnson

LDLIBS=-lwiringPi

blink: blink.c

run: blink
	sudo ./blink
.PHONY: run

clean:
	$(RM) blink

kristopherjohnson

import Cocoa

/// Demonstrate launching an `NSTask` and asynchronously reading its output.
///
/// Credit: <http://stackoverflow.com/a/23938137/1175>

func testTaskOutputPipe() {
    let task = NSTask()
    task.launchPath = "/bin/ls"
    task.arguments = ["-l", "/Applications"]

kristopherjohnson

import Foundation


/// Given a positive integer, find its prime factors.
///
/// - parameter number: The number to be factored.
/// 
/// - returns: Array of factors.
///
/// - TODO: Use a less-naive algorithm. Construct the result lazily.

kristopherjohnson

import Foundation

extension String {
    
    /// Returns a new string made by appending to the receiver a filesystem path component.
    ///
    /// - parameter pathComponent: The path component to be appended to the receiver.
    ///
    /// - returns: A new `String` made by appending `pathComponent` to the receiver, preceded if necessary by a path separator.
    

kristopherjohnson

import Foundation

/// Given a wildcard pattern, return matching paths.
///
/// - parameter pattern: pathname pattern to be expanded. See docs for `glob(3)`.
/// - returns: array of pathnames that match the pattern
func matchingFilesForPattern(pattern: String) -> [String] {
    var result = Array<String>()
    
    var g = glob_t()

kristopherjohnson

// Implementation of Robert C. Martin's turnstile state-machine example

/// Defines the "events" that can be invoked on a turnstile-like object.
protocol TurnstileEventHandler {
    func onCoin()
    func onPass()
}

/// Defines the "actions" that a turnstile can take due to an event or state transition.
protocol TurnstileActionDelegate: class {

kristopherjohnson

#!/usr/bin/swift

// Gets the info.plist data for executables specified on command line

import Foundation

if Process.argc < 2 {
    print("usage: get-info-dictionary EXECUTABLE...")
}
else {

kristopherjohnson

import Cocoa

class MyInitiallyPositionedWindowController: NSWindowController {

    override func windowDidLoad() {
        super.windowDidLoad()
        
        if let window = window, screen = window.screen {
            let screenRect = screen.visibleFrame
            let offsetFromLeft = CGFloat(200)