feat: Add psi(PageSpeed Insights) utility

Gemfile

@@ -8,6 +8,9 @@ gem 'wdm', '~> 0.1.0', platforms: [:mswin, :mingw]
 # Windows does not come with time zone data
 gem 'tzinfo-data', platforms: [:mswin, :mingw, :jruby]
 
+gem 'rake'
+gem 'typhoeus'
+
 # Middleman Gems
 gem 'middleman', '~> 4.1'
 gem 'middleman-minify-html'

Gemfile.lock

@@ -35,6 +35,8 @@ GEM
     contracts (0.13.0)
     dotenv (2.2.1)
     erubis (2.7.0)
+    ethon (0.10.1)
+      ffi (>= 1.3.0)
     execjs (2.7.0)
     fast_blank (1.0.0)
     fastimage (2.1.0)
@@ -118,6 +120,7 @@ GEM
     parallel (1.11.2)
     public_suffix (2.0.5)
     rack (2.0.3)
+    rake (12.0.0)
     rb-fsevent (0.9.8)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
@@ -130,6 +133,8 @@ GEM
     thor (0.19.4)
     thread_safe (0.3.6)
     tilt (2.0.7)
+    typhoeus (1.1.2)
+      ethon (>= 0.9.0)
     tzinfo (1.2.3)
       thread_safe (~> 0.1)
     uglifier (3.2.0)
@@ -149,7 +154,9 @@ DEPENDENCIES
   middleman-minify-html
   middleman-search_engine_sitemap
   middleman-syntax
+  rake
   redcarpet (~> 3.3, >= 3.3.3)
+  typhoeus
   tzinfo-data
   wdm (~> 0.1.0)
 

Rakefile

@@ -0,0 +1,41 @@
+require 'uri'
+require 'json'
+require 'typhoeus'
+
+desc 'Compare Google PageSpeed Insights'
+task :psi, ['from', 'to'] do |t, args|
+	STRATEGIES = %w(mobile desktop)
+	COMPARE_KEYS = [
+		%i(ruleGroups SPEED score),
+		%i(ruleGroups USABILITY score),
+		%i(pageStats numberResources),
+		%i(pageStats numberHosts),
+		%i(pageStats totalRequestBytes),
+		%i(pageStats htmlResponseBytes),
+		%i(pageStats cssResponseBytes),
+		%i(pageStats imageResponseBytes),
+		%i(pageStats javascriptResponseBytes),
+		%i(pageStats numberJsResources),
+		%i(pageStats numberCssResources),
+		# %i(formattedResults ruleResults AvoidLandingPageRedirects),
+	]
+	domain_from = URI.parse(args.from).host
+	domain_to = URI.parse(args.to).host
+
+	STRATEGIES.each do |strategy|
+		response_from = Typhoeus.get("https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=#{args.from}&strategy=#{strategy}")
+		response_to = Typhoeus.get("https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=#{args.to}&strategy=#{strategy}")
+		result_from = JSON.parse(response_from.body, symbolize_names: true)
+		result_to = JSON.parse(response_to.body, symbolize_names: true)
+		puts "### #{strategy}"
+		puts "|Name|#{domain_from}|#{domain_to}|Diff|"
+		puts '|---|---|---|---|'
+		COMPARE_KEYS.each do |path|
+			score_from = result_from.dig(*path).to_i
+			score_to = result_to.dig(*path).to_i
+			score_operator = score_to - score_from > 0 ? '+' : ''
+			puts "|#{path.join('.')}|#{score_from}|#{score_to}|#{score_operator}#{score_to - score_from}|"
+		end
+		puts
+	end
+end