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# frozen_string_literal: true
module JekyllDefaultLayout
# Injects front matter defaults to set default layouts, if they exist
class Generator < Jekyll::Generator
attr_accessor :site
safe true
priority :lowest
def initialize(site)
@site = site
end
def generate(site)
@site = site
documents.each do |document|
next unless should_set_layout?(document)
document.data["layout"] = layout_for(document)
end
end
def should_set_layout?(document)
markdown?(document) && !layout_specified?(document)
end
# Does the given layout exist for the site?
def layout_exists?(layout)
!site.layouts[layout].nil?
end
# Has the user already specified a default for this layout?
# Note: We must use `to_liquid`, and not data, to ensure front matter defaults
def layout_specified?(document)
document.to_liquid.key? "layout"
end
def markdown?(document)
markdown_converter.matches(document.extname)
end
# What layout is appropriate for this document, if any
# rubocop:disable Metrics/PerceivedComplexity
def layout_for(document)
if index?(document) && layout_exists?("home")
"home"
elsif page?(document) && layout_exists?("page")
"page"
elsif post?(document) && layout_exists?("post")
"post"
elsif layout_exists?("default")
"default"
end
end
# rubocop:enable Metrics/PerceivedComplexity
def documents
[site.pages, site.posts.docs].flatten
end
def markdown_converter
@markdown_converter ||= site.find_converter_instance(Jekyll::Converters::Markdown)
end
def post?(document)
document.is_a?(Jekyll::Document) && document.collection.label == "posts"
end
def page?(document)
document.is_a?(Jekyll::Page)
end
def index?(document)
document.url == "/"
end
end
end
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