adds minimal counter function right in the page

Author: bvandgrift

Gemfile.lock

@@ -0,0 +1,141 @@
+PATH
+  remote: .
+  specs:
+    saddlebag (0.1.0)
+      rails (~> 6.0.3, >= 6.0.3.2)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (6.0.3.2)
+      actionpack (= 6.0.3.2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (6.0.3.2)
+      actionpack (= 6.0.3.2)
+      activejob (= 6.0.3.2)
+      activerecord (= 6.0.3.2)
+      activestorage (= 6.0.3.2)
+      activesupport (= 6.0.3.2)
+      mail (>= 2.7.1)
+    actionmailer (6.0.3.2)
+      actionpack (= 6.0.3.2)
+      actionview (= 6.0.3.2)
+      activejob (= 6.0.3.2)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (6.0.3.2)
+      actionview (= 6.0.3.2)
+      activesupport (= 6.0.3.2)
+      rack (~> 2.0, >= 2.0.8)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (6.0.3.2)
+      actionpack (= 6.0.3.2)
+      activerecord (= 6.0.3.2)
+      activestorage (= 6.0.3.2)
+      activesupport (= 6.0.3.2)
+      nokogiri (>= 1.8.5)
+    actionview (6.0.3.2)
+      activesupport (= 6.0.3.2)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (6.0.3.2)
+      activesupport (= 6.0.3.2)
+      globalid (>= 0.3.6)
+    activemodel (6.0.3.2)
+      activesupport (= 6.0.3.2)
+    activerecord (6.0.3.2)
+      activemodel (= 6.0.3.2)
+      activesupport (= 6.0.3.2)
+    activestorage (6.0.3.2)
+      actionpack (= 6.0.3.2)
+      activejob (= 6.0.3.2)
+      activerecord (= 6.0.3.2)
+      marcel (~> 0.3.1)
+    activesupport (6.0.3.2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+      zeitwerk (~> 2.2, >= 2.2.2)
+    builder (3.2.4)
+    concurrent-ruby (1.1.7)
+    crass (1.0.6)
+    erubi (1.9.0)
+    globalid (0.4.2)
+      activesupport (>= 4.2.0)
+    i18n (1.8.5)
+      concurrent-ruby (~> 1.0)
+    loofah (2.7.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
+    method_source (1.0.0)
+    mimemagic (0.3.5)
+    mini_mime (1.0.2)
+    mini_portile2 (2.4.0)
+    minitest (5.14.2)
+    nio4r (2.5.3)
+    nokogiri (1.10.10)
+      mini_portile2 (~> 2.4.0)
+    rack (2.2.3)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails (6.0.3.2)
+      actioncable (= 6.0.3.2)
+      actionmailbox (= 6.0.3.2)
+      actionmailer (= 6.0.3.2)
+      actionpack (= 6.0.3.2)
+      actiontext (= 6.0.3.2)
+      actionview (= 6.0.3.2)
+      activejob (= 6.0.3.2)
+      activemodel (= 6.0.3.2)
+      activerecord (= 6.0.3.2)
+      activestorage (= 6.0.3.2)
+      activesupport (= 6.0.3.2)
+      bundler (>= 1.3.0)
+      railties (= 6.0.3.2)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (6.0.3.2)
+      actionpack (= 6.0.3.2)
+      activesupport (= 6.0.3.2)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.20.3, < 2.0)
+    rake (13.0.1)
+    sprockets (4.0.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.1)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    thor (1.0.1)
+    thread_safe (0.3.6)
+    tzinfo (1.2.7)
+      thread_safe (~> 0.1)
+    websocket-driver (0.7.3)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.4.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  saddlebag!
+
+BUNDLED WITH
+   2.1.4

app/controllers/saddlebag/counter_controller.rb

@@ -0,0 +1,7 @@
+require_dependency "saddlebag/application_controller"
+
+module Saddlebag
+  class CounterController < ApplicationController
+    def index; end
+  end
+end

app/views/saddlebag/counter/index.html.erb

@@ -0,0 +1,12 @@
+<h1>HELLO!</h1>
+
+<p>elapsed since page load: <span id="counter">0</span></p>
+
+<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
+<script>
+let loadedAt = new Date().getTime();
+let updateFn = setInterval(function() {
+    let elapsed = (new Date().getTime() - loadedAt)/1000;
+    document.getElementById("counter").innerHTML = elapsed;
+}, 200); // update 5x second for maximum fan usage
+</script>

config/routes.rb

@@ -1,2 +1,3 @@
 Saddlebag::Engine.routes.draw do
+    get '/counter', to: 'counter#index'
 end