Cryptocurrency holdings snapshot report generator via coinmarketcap.com API (requires pry and curb gems)

crypto_report.rb

#!/usr/bin/env ruby
#
require 'date'
require 'json'
require 'curb'
require 'pry'

puts "Report generated #{DateTime.now.strftime("%Y-%m-%d at %I:%M %p %z")}"
puts

@req = Curl.get("https://api.coinmarketcap.com/v1/ticker/")
@ticker = JSON.parse(@req.body_str)
@tickerh = Hash[@ticker.map{|x| [x['id'], x] }]

def ticker_for(k)
  req = Curl.get("https://api.coinmarketcap.com/v1/ticker/#{k}/")
  ticker = JSON.parse(req.body_str)
  return ticker[0]
rescue => e
  puts e.message
  puts e.backtrace
  return false
end
puts 
@balances = {
  ethereum: 0.0,
  cardano: 0.0,
  :"bitcoin-cash" => 0.0,
  lisk: 0.0,
  monero: 0.0,
  ark: 0.0,
  iota: 0.0, # miota
  district0x: 0.0,
  bitcoin: 0.0,
  nxt: 0.0,
  ripple: 0.0,
  litecoin: 0.0
}

puts "Currencies:"
puts


def pct(i, str)
  i["percent_change_#{str}"] + "%"
end

def to_b(num)
  (num.to_i / 1000000000.0).round(2).to_s + "bil"
end

@totals = {usd: 0.0, btc: 0.0}

cols = ['name', 'symbol', 'qty', 'USD', 'BTC', 'USD total', 'BTC total', '1h', '24h', '7d', 'm. cap']


def tableize(*vals)
  printf vals.map{'%-13s'}.join(''), *vals
  printf "\n"
  STDOUT.flush
end

tableize *cols

tableize ('-' * 12 + ' ') * cols.count
#tableize '-' * (14 * 9)


@balances.each do |k,v|
  begin
    ks = k.to_s
    @i = @tickerh[ks] || ticker_for(ks)
    @v_usd = @i['price_usd'].to_f * v
    @v_btc = @i['price_btc'].to_f * v

    @totals[:usd] += @v_usd
    @totals[:btc] += @v_btc

    tableize @i['name'], @i['symbol'], v.round(4), @i['price_usd'].to_f.round(3), @i['price_btc'].to_f.round(3), @v_usd.round(3), @v_btc.round(5), pct(@i,'1h'), pct(@i,'24h'), pct(@i,'7d'), to_b(@i['market_cap_usd'])
  rescue => e
    puts e.message
    puts e.backtrace
    binding.pry
  end
end

puts
puts "Totals:"
puts
puts "#{@totals[:usd].round(2)} USD"
puts "#{@totals[:btc].round(6)} BTC"

puts