week_3_day_5_morning.rb

##Dependencies
#If you want to require library c when you install it it requires library d; 
#Things you are depending on depend on other things; 

##PACKAGE MANAGER SOLVES ALL OF THIS!
gem install package name #Will work out where to store it on your system, it will work out all the dependencies and go and download them; 
#Some gems are very complicated such as ImageMagick, it depends on software that is written on your computer and not in ruby; 

require 'sinatra' #only works if we have installed sinatra on our machine; 

#Bundle a tool that installs lots of gems for you; 
#Bundle install also creates a Gemfile.lock - it will say the current version of each gem that you are using; 
#Gemfile.lock #It locks the versions says which version of the gem work with the app;
#Bundle install, looks at dependencies and can work backwards to find out the most recent version of the dependency that works with all of them gems; 

#Heroku needs a Gemfile, heroku cant have every gem installed - we need to tell it what Gems our application relies on; 
http://www.bundler.io

config.ru #Describes to the server how to run our website

./ go into the current directory ad get main.rb
ru stands for rackup a way of loading servers - 
heroku only works using rackup - 

#bundle install in ther terminal #creates a Gemfile.lock;
bundle show sinatra #to show where it is installed on your machine

rackup #to run the application

require 'rubygems'
require 'bundler'
Bundler.require #anything that we metion in our gemfile will be required, we do not need to write require at the top of the file; 

#Rack is a tool that you plug a server into; 
#Webrick is a server that comes with Ruby; 

##CSS
-webkit-filter: saturate(0%)
-webkit-filter: saturate(100%)

##MVC
#The contoller can talk to the model and the model has all the information about the database; 
#The controller can also talk to the view; 
#The controller is like the main.rb in Sinatra opplication;