Process.swift

extension Process {
    @discardableResult
    static func runZshCommand(_ command: String) -> Int32 {
        let process = Process()
        process.launchPath = "/bin/zsh"
        process.arguments = ["-c", command]
        process.standardOutput = {
            let pipe = Pipe()
            pipe.fileHandleForReading.readabilityHandler = { handler in
                guard let string = String(data: handler.availableData, encoding: .utf8), !string.isEmpty else { return }
                print(string)
            }
            return pipe
        }()
        process.standardError = {
            let pipe = Pipe()
            pipe.fileHandleForReading.readabilityHandler = { handler in
                guard let string = String(data: handler.availableData, encoding: .utf8), !string.isEmpty else { return }
                print(string)
            }
            return pipe
        }()
        process.launch()
        process.waitUntilExit()
        (process.standardOutput as! Pipe).fileHandleForReading.readabilityHandler = nil
        (process.standardError as! Pipe).fileHandleForReading.readabilityHandler = nil
        return process.terminationStatus
    }
}