an cmd graph of the currency rate

currency_rate_graph.js

var blessed = require('blessed')
  , contrib = require('../index')
const axios = require("axios");

var minY = 11276;
var maxY=  11278;
var screen = blessed.screen()
, transactionsLine = contrib.line(
     { width:  120
          , height: 40
          , left: 15
          , top: 12
          , xPadding: 5
          , minY: minY
          , maxY: maxY
          , label: 'USD/JPY'
          })
var transactionsData = {
     title: 'USD/JPY',
     style: {line: 'red'},
     x: ['00:00', '00:05', '00:10', '00:15', '00:20', '00:30', '00:40', '00:50', '01:00', '01:10', '01:20', '01:30', '01:40', '01:50', '02:00', '02:10', '02:20', '02:30', '02:40', '02:50', '03:00', '03:10', '03:20', '03:30', '03:40', '03:50', '04:00', '04:10', '04:20', '04:30'],
     y: [11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,11270,111270,11270,11270,11270,11270,1270]
}

screen.append(transactionsLine);
transactionsLine.setData(transactionsData);

setInterval(function() {
    transactionsData.y.shift();
    axios.get('https://finance.yahoo.com/webservice/v1/symbols/allcurrencies/quote/?format=json')
      .then(function (response) {
                  let usd_jpy = response.data.list.resources.filter((pair)=>{
                                      return pair.resource.fields.name == "USD/JPY";
                                    })[0];
                  let current_price = parseFloat(usd_jpy.resource.fields.price)*100;
                  if( current_price > maxY || current_price < minY ){
                    maxY = current_price + 3;
                    minY = current_price - 3;
                    screen.remove(transactionsLine);
                    transactionsLine = contrib.line(
                         { width:  120
                              , height: 40
                              , left: 15
                              , top: 12
                              , xPadding: 5
                              , minY: minY
                              , maxY: maxY
                              , label: 'USD/JPY'
                              });
                   screen.append(transactionsLine);
                  }
                  transactionsData.y.push(parseFloat(usd_jpy.resource.fields.price)*100);
                  transactionsLine.setData(transactionsData);
                  screen.render()
                })
      .catch(function (error) {
                  console.log(error);
                });
}, 2000);

screen.key(['escape', 'q', 'C-c'], function(ch, key) {
    return process.exit(0);
});

need to checkout this PR.
yaronn/blessed-contrib#98