SimDirs-mirror/SimDirs/Support.swift

//
//  Support.swift
//  SimDirs
//
//  Created by Casey Fleser on 4/30/16.
//  Copyright © 2016 Quiet Spark. All rights reserved.
//
//	Assorted convenience extensions

import Foundation

extension Array {
    mutating func match(_ predicate: (Element) -> Bool, orMake: () -> Element) -> Element {
        let element	: Element
        
        if let index = self.firstIndex(where: predicate) {
            element = self[index]
        }
        else {
            element = orMake()
            self.append(element)
        }
        
        return element
    }
}

extension Collection {
    subscript (safe index: Index) -> Iterator.Element? {
        return self[index]
    }
}

extension String {
    var validPath	: Bool { return FileManager.default.fileExists(atPath: self) }
}

extension URL {
    var validPath	: Bool { return FileManager.default.fileExists(atPath: self.path) }
}

extension PropertyListSerialization {
    class func propertyListWithURL(_ url: URL) -> [String : AnyObject]? {
        guard let plistData	= try? Data(contentsOf: url) else { return nil }
        let plist			: [String : AnyObject]?
        
        do {
            plist = try PropertyListSerialization.propertyList(from: plistData, options: PropertyListSerialization.MutabilityOptions(), format: nil) as? [String : AnyObject]
        } catch {
            plist = nil
        }
        
        return plist
    }
}