Updates README

ImageAssetChecker.swift

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+#!/usr/bin/env xcrun --sdk macosx swift
+
+import Foundation
+
+let assetCatalogPath = "/FastIteration/Assets.xcassets"
+
+func listAssets() -> [String] {
+    var assetNames = [String]()
+    let path = FileManager.default.currentDirectoryPath + assetCatalogPath
+    let enumerator: FileManager.DirectoryEnumerator? = FileManager.default.enumerator(atPath: path)
+    let extensionName = "imageset"
+    while let element = enumerator?.nextObject() as? String {
+        if element.hasSuffix(extensionName) {
+            let name = element.replacingOccurrences(of: ".\(extensionName)", with: "")
+            assetNames.append(name)
+        }
+    }
+    return assetNames
+}
+
+func listUsedAssetLiterals() -> [String] {
+    let patterns = [
+        "#imageLiteral\\(resourceName: \"(\\w+)\"\\)" // Image Literal
+    ]
+    let sourcesPath = FileManager.default.currentDirectoryPath + "/FastIteration"
+    let fileManager = FileManager.default
+    let enumerator = fileManager.enumerator(atPath:sourcesPath)
+    var localizedStrings = [String]()
+    while let swiftFileLocation = enumerator?.nextObject() as? String {
+        // checks the extension // TODO OBJC?
+        if swiftFileLocation.hasSuffix(".swift") || swiftFileLocation.hasSuffix(".m") {
+            let location = "\(sourcesPath)/\(swiftFileLocation)"
+            if let string = try? String(contentsOfFile: location, encoding: .utf8) {
+                for p in patterns {
+                    let regex = try? NSRegularExpression(pattern: p, options: [])
+                    let range = NSRange(location:0, length:(string as NSString).length) //Obj c wa
+                    regex?.enumerateMatches(in: string,
+                                            options: [],
+                                            range: range,
+                                            using: { (result, _, _) in
+                                                if let r = result {
+                                                    let value = (string as NSString).substring(with:r.rangeAt(1))
+                                                    localizedStrings.append(value)
+                                                }
+                    })
+                }
+            }
+        }
+    }
+    return localizedStrings
+}
+
+
+
+
+
+
+
+let assets = Set(listAssets())
+let used = Set(listUsedAssetLiterals())
+
+
+// Generate Warnings for Unused Assets
+let unused = assets.subtracting(used)
+unused.forEach { assetName in
+    var path = FileManager.default.currentDirectoryPath + assetCatalogPath
+    print("\(path):: warning: [Asset Unused] \(assetName)")
+}
+
+
+// Generate Error for broken Assets
+let broken = used.subtracting(assets)
+broken.forEach { assetName in
+    var path = FileManager.default.currentDirectoryPath + assetCatalogPath
+    print("\(path):: error: [Asset Missing] \(assetName)")
+}
+
+if broken.count > 0 {
+    exit(1)
+}
+
+// TODO unsused get file and line