Add autoloading via Zeitwerk (#891)

Closes #886

Author: joeldrapper

config/quickdraw.rb

@@ -23,7 +23,7 @@
 
 require "phlex"
 
-Phlex.eager_load
+Phlex::Loader.eager_load
 
 # Previous content of test helper now starts here
 $LOAD_PATH.unshift(File.expand_path("../fixtures", __dir__))

lib/phlex.rb

@@ -2,25 +2,22 @@
 
 require "erb"
 require "set"
+require "zeitwerk"
 
 module Phlex
-	autoload :VERSION, "phlex/version"
-
-	autoload :Kit, "phlex/kit"
-	autoload :FIFO, "phlex/fifo"
-	autoload :Helpers, "phlex/helpers"
-	autoload :FIFOCacheStore, "phlex/fifo_cache_store"
-
-	autoload :CSV, "phlex/csv"
-	autoload :SVG, "phlex/svg"
-	autoload :HTML, "phlex/html"
-	autoload :SGML, "phlex/sgml"
-
-	autoload :Error, "phlex/error"
-	autoload :NameError, "phlex/errors/name_error"
-	autoload :RuntimeError, "phlex/errors/runtime_error"
-	autoload :ArgumentError, "phlex/errors/argument_error"
-	autoload :DoubleRenderError, "phlex/errors/double_render_error"
+	Loader = Zeitwerk::Loader.for_gem.tap do |loader|
+		loader.push_dir("lib/phlex/errors", namespace: Phlex)
+		loader.inflector.inflect(
+			"csv" => "CSV",
+			"fifo" => "FIFO",
+			"fifo_cache_store" => "FIFOCacheStore",
+			"html" => "HTML",
+			"sgml" => "SGML",
+			"svg" => "SVG",
+		)
+
+		loader.setup
+	end
 
 	Escape = ERB::Escape
 
@@ -35,17 +32,6 @@ def self.__expand_attribute_cache__(file_path)
 		end
 	end
 
-	def self.eager_load
-		queue = [self]
-
-		while (mod = queue.shift)
-			mod.constants.each do |const_name|
-				const = mod.const_get(const_name)
-				queue << const if Module === const
-			end
-		end
-	end
-
 	# Generate an HTML string using Phlex’ HTML DSL
 	def self.html(&block)
 		HTML.call do |component|

lib/phlex/html.rb

@@ -1,9 +1,6 @@
 # frozen_string_literal: true
 
 class Phlex::HTML < Phlex::SGML
-	autoload :StandardElements, "phlex/html/standard_elements"
-	autoload :VoidElements, "phlex/html/void_elements"
-
 	extend Phlex::SGML::Elements
 	include VoidElements, StandardElements
 

lib/phlex/sgml.rb

@@ -16,11 +16,6 @@ def compiler.add_insert_cmd(out, content)
 		end
 	end
 
-	autoload :Elements, "phlex/sgml/elements"
-	autoload :SafeObject, "phlex/sgml/safe_object"
-	autoload :SafeValue, "phlex/sgml/safe_value"
-	autoload :State, "phlex/sgml/state"
-
 	include Phlex::Helpers
 
 	class << self

lib/phlex/svg.rb

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 class Phlex::SVG < Phlex::SGML
-	autoload :StandardElements, "phlex/svg/standard_elements"
-
 	include StandardElements
 
 	# Returns the string "image/svg+xml"

phlex.gemspec

@@ -27,4 +27,6 @@ Gem::Specification.new do |spec|
 	]
 
 	spec.require_paths = ["lib"]
+
+	spec.add_runtime_dependency "zeitwerk"
 end