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module RailsGuides
class Markdown
class Renderer < Redcarpet::Render::HTML
def initialize(options={})
super
end
def header(text, header_level)
# Always increase the heading level by, so we can use h1, h2 heading in the document
header_level += 1
%(<h#{header_level} id="#{dom_id(text)}">#{text}</h#{header_level}>)
end
def preprocess(full_document)
convert_notes(full_document)
end
private
def convert_notes(body)
# The following regexp detects special labels followed by a
# paragraph, perhaps at the end of the document.
#
# It is important that we do not eat more than one newline
# because formatting may be wrong otherwise. For example,
# if a bulleted list follows the first item is not rendered
# as a list item, but as a paragraph starting with a plain
# asterisk.
body.gsub(/^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:](.*?)(\n(?=\n)|\Z)/m) do |m|
css_class = case $1
when 'CAUTION', 'IMPORTANT'
'warning'
when 'TIP'
'info'
else
$1.downcase
end
%Q(<div class="#{css_class}"><p>#{$2.strip}</p></div>\n)
end
end
def dom_id(text)
text.downcase.gsub(/[^a-z0-9]+/, '-').strip
end
end
end
end
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