Speed up initial require with autoload

CHANGELOG.md

@@ -17,6 +17,9 @@ Bugs:
 * Fix frozen string error on `Squib.xlsx` import when stripping newlines is enabled
 * `save_sheet` works with `rtl` and `trim` altogether properly now.
 
+Chores:
+* Added autoloading for various slow-loading libraries, speeding up initial `require`
+
 ## v0.17.1 / 2021-08-11
 
 Bugs:

bin/squib

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
 require 'squib'
+require 'squib/commands/cli'
 
 Squib::CLI.new.run

lib/squib.rb

@@ -1,7 +1,7 @@
+autoload :Cairo, 'cairo'
+autoload :Pango, 'pango'
+autoload :Rsvg,  'rsvg2'
 require 'logger'
-require 'cairo'
-require 'pango'
-require 'rsvg2'
 require 'rainbow/refinement'
 require_relative 'squib/version'
 require_relative 'squib/commands/cli'
@@ -9,7 +9,6 @@ require_relative 'squib/deck'
 require_relative 'squib/card'
 require_relative 'squib/system_fonts'
 
-
 module Squib
   using Rainbow # we can colorize strings now!
 

lib/squib/import/xlsx_importer.rb

@@ -1,4 +1,4 @@
-require 'roo'
+autoload :Roo, 'roo'
 require_relative 'quantity_exploder'
 
 module Squib::Import