A Swift "Shell Script" to convert the output of "speedtest-cli" to csv

speedtest.swift

#!/usr/bin/xcrun swift

// A script to take the results of "speedtest-cli" and convert it into csv data.

// This script requires "speedtest-cli" to be installed via `pip`.  It will print
// out the results in csv format like the following: "Date,Time,Ping,Download,Upload"
//
// e.g.:
// 2/8/16,9:13:00 AM,24.456,55.72,24.03

// This script is intended to be run as a "shell script", i.e.:
// $> chmod +x speedtest.swift
// $> ./speedtest.swift

import Foundation

func exec(command: String) -> (output: String, exitStatus: Int) {
    let tokens = command.componentsSeparatedByString(" ")
    let launchPath = tokens[0]
    let arguments = tokens.dropFirst(1)
    
    let task = NSTask()
    task.launchPath = launchPath
    task.arguments = Array(arguments)
    let stdout = NSPipe()
    task.standardOutput = stdout
    
    task.launch()
    task.waitUntilExit()
    
    let outData = stdout.fileHandleForReading.readDataToEndOfFile()
    let outStr = String(data: outData, encoding: NSUTF8StringEncoding)!
    return (outStr, Int(task.terminationStatus))
}

let result = exec("/usr/local/bin/speedtest --simple")

let results = result
    .output
    .componentsSeparatedByCharactersInSet(NSCharacterSet.newlineCharacterSet())
    .prefix(3)
    .flatMap { string -> String? in
        let components = string.componentsSeparatedByCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
        return components.count > 1 ? components[1] : nil
}

let date = NSDate()
let dateFormatter = NSDateFormatter()

dateFormatter.dateStyle = .ShortStyle
dateFormatter.timeStyle = .NoStyle

let dateString = dateFormatter.stringFromDate(date)

dateFormatter.dateStyle = .NoStyle
dateFormatter.timeStyle = .MediumStyle

let timeString = dateFormatter.stringFromDate(date)

let printables = [dateString, timeString] + results
print(printables.joinWithSeparator(","))

I use this with a cron job on my home server to query Speedtest every hour and log it to a CSV file in my Dropbox folder