Convert URL Request to curl command

URLRequest+curlCommand.swift

extension URLRequest {
    
    public func curl(pretty:Bool = false) -> String {
        
        var data : String = ""
        let complement = pretty ? "\\\n" : ""
        let method = "-X \(self.httpMethod ?? "GET") \(complement)"
        let url = "\"" + (self.url?.absoluteString ?? "") + "\""
        
        var header = ""
        
        if let httpHeaders = self.allHTTPHeaderFields, httpHeaders.keys.count > 0 {
            for (key,value) in httpHeaders {
                header += "-H \"\(key): \(value)\" \(complement)"
            }
        }
        
        if let bodyData = self.httpBody, let bodyString = String(data:bodyData, encoding:.utf8) {
            data = "-d \"\(bodyString)\" \(complement)"
        }
        
        let command = "curl -i " + complement + method + header + data + url
        
        return command
    }
    
}