require 'commonmarker'
CommonMarker.render_html('Hi *there*', :default)
# <p>Hi <em>there</em></p>\n

require 'commonmarker'

doc = CommonMarker.render_doc('*Hello* world', :default)
puts(doc.to_html) # <p>Hi <em>there</em></p>\n

doc.walk do |node|
  puts node.type # [:document, :paragraph, :text, :emph, :text]
end

require 'commonmarker'

# parse the files specified on the command line
doc = CommonMarker.render_doc("# The site\n\n [GitHub](https://www.github.com)")

# Walk tree and print out URLs for links
doc.walk do |node|
  if node.type == :link
    printf("URL = %s\n", node.url)
  end
end

# Capitalize all regular text in headers
doc.walk do |node|
  if node.type == :header
    node.each do |subnode|
      if subnode.type == :text
        subnode.string_content = subnode.string_content.upcase
      end
    end
  end
end

# Transform links to regular text
doc.walk do |node|
  if node.type == :link
    node.insert_before(node.first_child)
    node.delete
  end
end

class MyHtmlRenderer < CommonMarker::HtmlRenderer
  def initialize
    super
    @headerid = 1
  end

  def header(node)
    block do
      out("<h", node.header_level, " id=\"", @headerid, "\">",
               :children, "</h", node.header_level, ">")
      @headerid += 1
    end
  end
end

# this renderer prints directly to STDOUT, instead
# of returning a string
myrenderer = MyHtmlRenderer.new
print(myrenderer.render(doc))

# Print any warnings to STDERR
renderer.warnings.each do |w|
  STDERR.write("#{w}\n")
end

CommonMarker.render_doc("\"Hello,\" said the spider.", :smart)
# <p>“Hello,” said the spider.</p>\n

CommonMarker.render_html("\"'Shelob' is my name.\"", [:hardbreaks, :sourcepos])