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require 'set'
# Convertible provides methods for converting a pagelike item
# from a certain type of markup into actual content
#
# Requires
# self.site -> Jekyll::Site
# self.content
# self.content=
# self.data=
# self.ext=
# self.output=
module Jekyll
module Convertible
# Returns the contents as a String.
def to_s
self.content || ''
end
# Read the YAML frontmatter.
#
# base - The String path to the dir containing the file.
# name - The String filename of the file.
#
# Returns nothing.
def read_yaml(base, name)
self.content = File.read(File.join(base, name))
if self.content =~ /^(---\s*\n.*?\n?)^(---\s*$\n?)/m
self.content = $POSTMATCH
begin
self.data = YAML.load($1)
rescue => e
puts "YAML Exception: #{e.message}"
end
end
self.data ||= {}
end
# Transform the contents based on the content type.
#
# Returns nothing.
def transform
self.content = converter.convert(self.content)
end
# Determine the extension depending on content_type.
#
# Returns the String extension for the output file.
# e.g. ".html" for an HTML output file.
def output_ext
converter.output_ext(self.ext)
end
# Determine which converter to use based on this convertible's
# extension.
#
# Returns the Converter instance.
def converter
@converter ||= self.site.converters.find { |c| c.matches(self.ext) }
end
# Add any necessary layouts to this convertible document.
#
# payload - The site payload Hash.
# layouts - A Hash of {"name" => "layout"}.
#
# Returns nothing.
def do_layout(payload, layouts)
info = { :filters => [Jekyll::Filters], :registers => { :site => self.site } }
# render and transform content (this becomes the final content of the object)
payload["pygments_prefix"] = converter.pygments_prefix
payload["pygments_suffix"] = converter.pygments_suffix
begin
self.content = Liquid::Template.parse(self.content).render(payload, info)
rescue => e
puts "Liquid Exception: #{e.message} in #{self.data["layout"]}"
end
self.transform
# output keeps track of what will finally be written
self.output = self.content
# recursively render layouts
layout = layouts[self.data["layout"]]
used = Set.new([layout])
while layout
payload = payload.deep_merge({"content" => self.output, "page" => layout.data})
begin
self.output = Liquid::Template.parse(layout.content).render(payload, info)
rescue => e
puts "Liquid Exception: #{e.message} in #{self.data["layout"]}"
end
if layout = layouts[layout.data["layout"]]
if used.include?(layout)
layout = nil # avoid recursive chain
else
used << layout
end
end
end
end
end
end
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