cli.js

#!/usr/bin/env node
'use strict'
let chalk = require('chalk')
let logUpdate = require('log-update')
let source = require('./index')
let fmt = require('./formatters')



const INTERVAL = 1000
// https://support.metageek.com/hc/en-us/articles/201955754-Acceptable-Wi-Fi-Signal-Strengths
//https://support.bluesound.com/hc/en-us/articles/201940663-What-should-my-Wireless-Signal-Strength-be-for-best-performance-
//http://www.watchguard.com/help/docs/wsm/xtm_11/en-US/index.html#cshid=en-US/wireless/ap_wireless_signalstrength_c.html
//SNR
//http://www.enterprisenetworkingplanet.com/netsp/article.php/3747656/WiFi-Define-Minimum-SNR-Values-for-Signal-Coverage.htm
//


let activity = false
function aniTitle(title, n) {
  // TODO: when abstracting this, activity should be a clojure value for this func
  //let f = title.slice(0,1)
  let f = chalk.magenta(title.slice(0,n))
  let t = chalk.magenta(title.slice(n))
  f = activity ? chalk.inverse(f) : f;
  return f + t;
}

function template(data) {
  return `\

  ${aniTitle(data.title, 4)}

                   Signal ${data.signalMarkers} ${data.signal || 'no data'} dBm | ${data.quality || 'no data'} %
                      SNR ${data.snrMarkers} ${data.snr || 'no data'} dBm

  Detail
  ------
     Quality[%]: ${data.quality || 'no data'}
    Signal[dBm]: ${data.signal || 'no data'}
     Noise[dBm]: ${data.noise || 'no data'}
       SNR[dBm]: ${data.snr || 'no data'}
      Rate[Mbs]: ${chalk.inverse(data.rate || 'no data')}



  Info
  ----
  SNR: Signal To noise Ratio (difference)
  SNR = S - N [dBm]

  Quality: Quality of the signal based on the power with which the signal is percived
  Quality = 2 * (Signal + 100)
  `
}

function render() {
  activity = !activity
  let data = source()
  let signalPer = fmt.getPercentage(data.signal, -100, -50)
  let signalMarkers = fmt.getColor(signalPer)(fmt.getMarkers(signalPer))
  let snrPer = fmt.getPercentage(data.snr, 4, 25)
  let snrMarkers = fmt.getColor(snrPer)(fmt.getMarkers(snrPer))
  let qualityPer = fmt.getPercentage(data.quality)
  let qualityMarkers = fmt.getColor(qualityPer)(fmt.getMarkers(qualityPer))
  let title = 'SITH: Wifi Signal Strength Analyzer'

  Object.assign(data, {
    title,
    signalMarkers,
    qualityMarkers,
    snrMarkers
  })

  logUpdate(template(data))
}

function sithCli() {
  render()
  setInterval( _ => render(), 1000)
}




// Render in a cleared screen
process.stdout.cursorTo(0, 0);
process.stdout.clearScreenDown();
sithCli();