Swift: Launch at Login Helper

gistfile1.swift

//
//  LaunchAtLoginHelper.swift
//
//  Created by Erica Sadun on 4/1/15.
//  Copyright (c) 2015 Erica Sadun. All rights reserved.
//

import Foundation

public func getLoginItems() -> LSSharedFileList? {
    let allocator : CFAllocator! = CFAllocatorGetDefault().takeUnretainedValue()
    let kLoginItems : CFString! = kLSSharedFileListSessionLoginItems.takeUnretainedValue()
    var loginItems_ = LSSharedFileListCreate(allocator, kLoginItems, nil)
    if loginItems_ == nil {return nil}
    let loginItems : LSSharedFileList! = loginItems_.takeRetainedValue()
    return loginItems
}

public func existingItem(itemURL : NSURL) -> LSSharedFileListItem? {
    let loginItems_ = getLoginItems()
    if loginItems_ == nil {return nil}
    let loginItems = loginItems_!
    
    var seed : UInt32 = 0
    let currentItems = LSSharedFileListCopySnapshot(loginItems, &seed).takeRetainedValue() as NSArray
    
    for item in currentItems {
        let resolutionFlags : UInt32 = UInt32(kLSSharedFileListNoUserInteraction | kLSSharedFileListDoNotMountVolumes)
        var url = LSSharedFileListItemCopyResolvedURL(item as! LSSharedFileListItem, resolutionFlags, nil).takeRetainedValue() as NSURL
        if url.isEqual(itemURL) {
            let result = item as! LSSharedFileListItem
            return result
        }
    }
    
    return nil
}

public func willLaunchAtLogin(itemURL : NSURL) -> Bool {
    return existingItem(itemURL) != nil
}

public func setLaunchAtLogin(itemURL: NSURL, enabled: Bool) -> Bool {
    let loginItems_ = getLoginItems()
    if loginItems_ == nil {return false}
    let loginItems = loginItems_!
    
    var item = existingItem(itemURL)
    if item != nil && enabled {return true}
    if item != nil && !enabled {
        LSSharedFileListItemRemove(loginItems, item)
        return true
    }
    
    LSSharedFileListInsertItemURL(loginItems, kLSSharedFileListItemBeforeFirst.takeUnretainedValue(), nil, nil, itemURL as CFURL, nil, nil)
    return true
}