Have Zeitwerk not automatically load filters

This causes problems if the underlying filter is not called, because
Zeitwerk attempts to laod the required dependencies

cf https://github.com/fxn/zeitwerk#use-case-the-adapter-pattern

README.md

@@ -79,7 +79,7 @@ end
 
 pipeline = HTMLPipeline.new(
   text_filters: [HelloJohnnyFilter.new]
-  convert_filter: HTMLPipeline::ConvertFilter::MarkdownFilter.new),
+  convert_filter: HTMLPipeline::ConvertFilter::MarkdownFilter.new,
     # note: next line is not needed as sanitization occurs by default;
     # see below for more info
   sanitization_config: HTMLPipeline::SanitizationFilter::DEFAULT_CONFIG,
@@ -126,8 +126,8 @@ context = {
 
 # Pipeline used for user provided content on the web
 MarkdownPipeline = HTMLPipeline.new (
-  text_filters: [HTMLPipeline::TextFilter::ImageMaxWidthFilter.new],
-  convert_filter: [HTMLPipeline::ConvertFilter::MarkdownFilter.new],
+  text_filters: [HTMLPipeline::TextFilter::ImageFilter.new],
+  convert_filter: HTMLPipeline::ConvertFilter::MarkdownFilter.new,
   node_filters: [
     HTMLPipeline::NodeFilter::HttpsFilter.new,HTMLPipeline::NodeFilter::MentionFilter.new,
   ], context: context)
@@ -137,7 +137,7 @@ MarkdownPipeline = HTMLPipeline.new (
 HtmlEmailPipeline = HTMLPipeline.new(
   text_filters: [
     PlainTextInputFilter.new,
-    ImageMaxWidthFilter.new
+    ImageFilter.new
   ], {})
 ```
 
@@ -173,7 +173,7 @@ pipeline = HTMLPipeline.new \
   text_filters: [
     HTMLPipeline::MarkdownFilter,
   ],
-  convert_filter: [HTMLPipeline::ConvertFilter::MarkdownFilter.new],
+  convert_filter: HTMLPipeline::ConvertFilter::MarkdownFilter.new,
   sanitization_config: ALLOWLIST
 
 result = pipeline.call <<-CODE
@@ -201,7 +201,7 @@ pipeline = HTMLPipeline.new \
   text_filters: [
     HTMLPipeline::MarkdownFilter,
   ],
-  convert_filter: [HTMLPipeline::ConvertFilter::MarkdownFilter.new],
+  convert_filter: HTMLPipeline::ConvertFilter::MarkdownFilter.new,
   sanitization_config: nil
 ```
 

lib/html_pipeline.rb

@@ -2,10 +2,15 @@
 
 require "zeitwerk"
 lib_dir = File.join(File.dirname(__dir__), "lib")
+lib_html_pipeline_dir = File.join(File.dirname(__dir__), "lib", "html_pipeline")
 gem_loader = Zeitwerk::Loader.for_gem
 gem_loader.inflector.inflect(
   "html_pipeline" => "HTMLPipeline",
 )
+
+gem_loader.ignore(File.join(lib_html_pipeline_dir, "convert_filter"))
+gem_loader.ignore(File.join(lib_html_pipeline_dir, "node_filter"))
+gem_loader.ignore(File.join(lib_html_pipeline_dir, "text_filter"))
 gem_loader.ignore(File.join(lib_dir, "html-pipeline.rb"))
 gem_loader.setup
 

lib/html_pipeline/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 class HTMLPipeline
-  VERSION = "3.0.0.pre5"
+  VERSION = "3.0.0.pre6"
 end