Code example for the article "Swift, Plist and Two Smoking Scripts" https://medium.com/rosberryapps/swift-plist-and-two-smoking-scripts-94bb54cbeded

swift-build-phase-scripts-3.swift

var keys: [String] = []
for url in swiftFileURLs {
    let contents = try String(contentsOf: url, encoding: .utf8)
    for (pattern, key) in patterns {
        if contents.contains(pattern) {
            keys.append(key)
        }
    }
}