GitHub HTML processing filters and utilities. This module includes a small framework for defining DOM based content filters and applying them to user provided content.

Add this line to your application's Gemfile:

gem 'html-pipeline'

And then execute:

$ bundle

Or install it yourself as:

$ gem install html-pipeline

This library provides a handful of chainable HTML filters to transform user content into markup. A filter takes an HTML string or Nokogiri::HTML::DocumentFragment, optionally manipulates it, and then outputs the result.

For example, to transform Markdown source into Markdown HTML:

require 'html/pipeline'

filter = HTML::Pipeline::MarkdownFilter.new("Hi **world**!")
filter.call

Filters can be combined into a pipeline which causes each filter to hand its output to the next filter's input. So if you wanted to have content be filtered through Markdown and be syntax highlighted, you can create the following pipeline:

pipeline = HTML::Pipeline.new [
  HTML::Pipeline::MarkdownFilter,
  HTML::Pipeline::SyntaxHighlightFilter
]
result = pipeline.call <<CODE
This is *great*:

    some_code(:first)

CODE
result[:output].to_s

Prints:

<p>This is <em>great</em>:</p>

<div class="highlight">
<pre><span class="n">some_code</span><span class="p">(</span><span class="ss">:first</span><span class="p">)</span>
</pre>
</div>

Some filters take an optional context and/or result hash. These are used to pass around arguments and metadata between filters in a pipeline. For example, if you want don't want to use GitHub formatted Markdown, you can pass an option in the context hash:

filter = HTML::Pipeline::MarkdownFilter.new("Hi **world**!", :gfm => false)
filter.call

• MentionFilter - replace @user mentions with links
• AutoLinkFilter - auto_linking urls in HTML
• CamoFilter - replace http image urls with camo-fied https versions
• EmailReplyFilter - util filter for working with emails
• EmojiFilter - everyone loves emoji!
• HttpsFilter - HTML Filter for replacing http github urls with https versions.
• ImageMaxWidthFilter - link to full size image for large images
• MarkdownFilter - convert markdown to html
• PlainTextInputFilter - html escape text and wrap the result in a div
• SanitizationFilter - whitelist sanitize user markup
• SyntaxHighlightFilter - code syntax highlighter with linguist
• TextileFilter - convert textile to html
• TableOfContentsFilter - anchor headings with name attributes

We define different pipelines for different parts of our app. Here are a few paraphrased snippets to get you started:

# The context hash is how you pass options between different filters.
# See individual filter source for explanation of options.
context = {
  :asset_root => "http://your-domain.com/where/your/images/live/icons",
  :base_url   => "http://your-domain.com"
}

# Pipeline providing sanitization and image hijacking but no mention
# related features.
SimplePipeline = Pipeline.new [
  SanitizationFilter,
  TableOfContentsFilter, # add 'name' anchors to all headers
  CamoFilter,
  ImageMaxWidthFilter,
  SyntaxHighlightFilter,
  EmojiFilter,
  AutolinkFilter
], context, {}

# Pipeline used for user provided content on the web
MarkdownPipeline = Pipeline.new [
  MarkdownFilter,
  SanitizationFilter,
  CamoFilter,
  ImageMaxWidthFilter,
  HttpsFilter,
  MentionFilter,
  EmojiFilter,
  SyntaxHighlightFilter
], context.merge(:gfm => true), {}  # enable github formatted markdown


# Define a pipeline based on another pipeline's filters
NonGFMMarkdownPipeline = Pipeline.new(MarkdownPipeline.filters,
  context.merge(:gfm => false), {})

# Pipelines aren't limited to the web. You can use them for email
# processing also.
HtmlEmailPipeline = Pipeline.new [
  ImageMaxWidthFilter
], {}, {}

# Just emoji.
EmojiPipeline = Pipeline.new [
  HTMLInputFilter,
  EmojiFilter
], context, {}

To write a custom filter, you need a class with a call method that inherits from HTML::Pipeline::Filter.

For example this filter adds a base url to images that are root relative:

require 'uri'

class RootRelativeFilter < HTML::Pipeline::Filter

  def call
    doc.search("img").each do |img| 
      next if img['src'].nil?
      src = img['src'].strip
      if src.start_with? '/'
        img["src"] = URI.join(context[:base_url], src).to_s
      end
    end
    doc
  end

end

Now this filter can be used in a pipeline:

Pipeline.new [ RootRelativeFilter ], { :base_url => 'http://somehost.com' }

To see what has changed in recent versions, see the CHANGELOG.

bundle
rake test

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

• test whether emoji filter works on heroku
• test whether nokogiri monkey patch is still necessary

• Aman Gupta
• Jake Boxer
• Joshua Peek
• Kyle Neath
• Rob Sanheim
• Simon Rozet
• Vicent Martí
• Risk :danger: Olson

Project is a member of the OSS Manifesto.