keyboard churn

keyboard-churn.coffee

#!/usr/bin/env coffee

process.stdin.resume()
require('tty').setRawMode(true)

history = {}
plans = {}

spew = () -> console.log(new Date)
setInterval spew, 1000

process.stdin.on 'keypress', (char, key) =>
    if (key && key.ctrl && key.name == 'c')
        process.exit()
        
    console.log("Event '#{char}'")
    clearTimeout plans[char]

    if ! history[char]?
        history[char] = []
    history[char].push new Date
    
    delay = 6000    # timespans in milliseconds
    if history[char].length > 1
        mean = ( history[char][history[char].length-1] - history[char][0] ) / history[char].length
        delay = 3*mean+500
        
    task = () =>
        console.log("Churn '#{char}'")
        history[char] = []
    plans[char] = setTimeout task, delay