historical price added

coinmarketcap.gemspec

@@ -31,6 +31,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_runtime_dependency 'httparty'
+  spec.add_runtime_dependency 'nokogiri'
   spec.add_development_dependency 'bundler', '~> 1.14'
   spec.add_development_dependency 'rake', '~> 10.0'
   spec.add_development_dependency 'rspec', '~> 3.0'

lib/coinmarketcap.rb

@@ -1,5 +1,7 @@
 require 'coinmarketcap/version'
+require 'open-uri'
 require 'httparty'
+require 'nokogiri'
 
 module Coinmarketcap
 
@@ -19,4 +21,30 @@ def self.global(currency = 'USD')
     HTTParty.get("https://api.coinmarketcap.com/v1/global/?convert=#{currency}")
   end
 
+  def self.get_historical_price(id, start_date, end_date) #20170908
+    prices = []
+    doc = Nokogiri::HTML(open("https://coinmarketcap.com/currencies/#{id}/historical-data/?start=#{start_date}&end=#{end_date}"))
+    rows = doc.css('tr')
+    if rows.count == 31
+      doc = Nokogiri::HTML(open("https://coinmarketcap.com/assets/#{id}/historical-data/?start=#{start_date}&end=#{end_date}"))
+      rows = doc.css('tr')
+    end
+    rows.shift
+    rows.each do |row|
+      begin
+        price_bundle = {}
+        each_row = Nokogiri::HTML(row.to_s).css('td')
+        price_bundle[:date] = Date.parse(each_row[0].text)
+        price_bundle[:open] = each_row[0].text
+        price_bundle[:high] = each_row[1].text
+        price_bundle[:low] = each_row[2].text
+        price_bundle[:close] = each_row[3].text
+        prices << price_bundle
+      rescue => error
+        next
+      end
+    end
+    prices
+  end
+
 end

lib/coinmarketcap/version.rb

@@ -1,3 +1,3 @@
 module Coinmarketcap
-  VERSION = "0.1.2"
+  VERSION = "0.2.0"
 end

spec/coinmarketcap_spec.rb

@@ -5,6 +5,18 @@
     expect(Coinmarketcap::VERSION).not_to be nil
   end
 
+  describe "#get_historical_price" do
+    context 'with valid id and start and end dates' do
+      it "should receive an non empty array" do
+        VCR.use_cassette('historical_price_response') do
+          data = Coinmarketcap.get_historical_price('bitcoin', '20170908', '20170914')
+          expect(data).to be_a Array
+          expect(data.count).to be > 0
+        end
+      end
+    end
+  end
+
   describe "#coins" do
     context 'without limit' do
       it "should receive a 200 response with all coins" do