feat(example): add example app and blog app with demos

examples/app.rb

@@ -0,0 +1,63 @@
+$LOAD_PATH.unshift(File.expand_path('../lib', __dir__))
+require 'prism'
+
+class ExampleApp < Prism::Application
+  enable_sessions(secret: 'prism-demo-secret')
+  use Prism::Middleware::Logger
+
+  helpers do
+    def layout(title, inner)
+      erb(<<~TEMPLATE, locals: { title: title, inner: inner })
+        <!doctype html>
+        <html><head><title><%= title %></title></head>
+        <body><%== inner %></body></html>
+      TEMPLATE
+    end
+  end
+
+  get '/' do
+    html('<h1>Prism</h1>')
+  end
+
+  get '/hello/:name' do
+    greeting = erb('<p>Hello, <%= name %>!</p>', locals: { name: params['name'] })
+    layout('Hello', greeting)
+  end
+
+  get '/search' do
+    json(query: params['q'], page: params['page'])
+  end
+
+  post '/echo' do
+    json(received: params.to_h)
+  end
+
+  get '/files/*' do
+    json(path: params['splat'])
+  end
+
+  group '/api' do
+    get '/status' do
+      json(ok: true)
+    end
+  end
+
+  get '/count' do
+    session['count'] = (session['count'] || 0) + 1
+    json(count: session['count'])
+  end
+
+  get '/old' do
+    redirect '/', 301
+  end
+end
+
+if __FILE__ == $PROGRAM_NAME
+  server = Prism::Server.new(ExampleApp, port: (ARGV[0] || 0).to_i).start
+  puts "Prism example listening on #{server.url}"
+  trap('INT') do
+    server.stop
+    exit
+  end
+  sleep
+end