182 lines
4.7 KiB
Ruby
182 lines
4.7 KiB
Ruby
require 'active_support/core_ext/hash/keys'
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require 'pathname'
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# Parsing YAML frontmatter
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require 'yaml'
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# Parsing JSON frontmatter
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require 'active_support/json'
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# Extensions namespace
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module Middleman::CoreExtensions
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class FrontMatter < ::Middleman::Extension
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# Try to run after routing but before directory_indexes
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self.resource_list_manipulator_priority = 90
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YAML_ERRORS = [StandardError]
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# https://github.com/tenderlove/psych/issues/23
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if defined?(Psych) && defined?(Psych::SyntaxError)
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YAML_ERRORS << Psych::SyntaxError
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end
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def initialize(app, options_hash={}, &block)
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super
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@cache = {}
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end
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def before_configuration
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file_watcher.changed(&method(:clear_data))
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file_watcher.deleted(&method(:clear_data))
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end
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# Modify each resource to add data & options from frontmatter.
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def manipulate_resource_list(resources)
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resources.each do |resource|
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next if resource.source_file.blank?
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fmdata = data(resource.source_file).first.dup
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# Copy over special options
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# TODO: Should we make people put these under "options" instead of having
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# special known keys?
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opts = fmdata.extract!(:layout, :layout_engine, :renderer_options, :directory_index, :content_type)
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opts[:renderer_options].symbolize_keys! if opts.key?(:renderer_options)
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ignored = fmdata.delete(:ignored)
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# TODO: Enhance data? NOOOO
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# TODO: stringify-keys? immutable/freeze?
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resource.add_metadata options: opts, page: fmdata
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resource.ignore! if ignored == true && !resource.is_a?(::Middleman::Sitemap::ProxyResource)
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# TODO: Save new template here somewhere?
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end
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end
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def after_configuration
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app.ignore %r{\.frontmatter$}
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end
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# Get the template data from a path
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# @param [String] path
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# @return [String]
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def template_data_for_file(path)
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data(path).last
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end
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def data(path)
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p = normalize_path(path)
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@cache[p] ||= begin
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data, content = frontmatter_and_content(p)
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if file_watcher.exists?("#{path}.frontmatter")
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external_data, _ = frontmatter_and_content("#{p}.frontmatter")
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data = external_data.deep_merge(data)
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end
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[data, content]
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end
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end
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def clear_data(file)
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# Copied from Sitemap::Store#file_to_path, but without
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# removing the file extension
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file = File.join(app.root, file)
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prefix = app.source_dir.sub(/\/$/, '') + '/'
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return unless file.include?(prefix)
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path = file.sub(prefix, '').sub(/\.frontmatter$/, '')
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@cache.delete(path)
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end
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private
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# Parse YAML frontmatter out of a string
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# @param [String] content
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# @return [Array<Hash, String>]
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def parse_yaml_front_matter(content, full_path)
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yaml_regex = /\A(---\s*\n.*?\n?)^(---\s*$\n?)/m
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if content =~ yaml_regex
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content = content.sub(yaml_regex, '')
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begin
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data = YAML.load($1) || {}
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data = data.symbolize_keys
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rescue *YAML_ERRORS => e
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app.logger.error "YAML Exception parsing #{full_path}: #{e.message}"
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return false
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end
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else
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return false
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end
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[data, content]
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rescue
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[{}, content]
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end
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def parse_json_front_matter(content, full_path)
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json_regex = /\A(;;;\s*\n.*?\n?)^(;;;\s*$\n?)/m
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if content =~ json_regex
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content = content.sub(json_regex, '')
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begin
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json = ($1 + $2).sub(';;;', '{').sub(';;;', '}')
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data = ActiveSupport::JSON.decode(json).symbolize_keys
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rescue => e
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app.logger.error "JSON Exception parsing #{full_path}: #{e.message}"
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return false
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end
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else
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return false
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end
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[data, content]
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rescue
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[{}, content]
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end
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# Get the frontmatter and plain content from a file
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# @param [String] path
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# @return [Array<Middleman::Util::HashWithIndifferentAccess, String>]
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def frontmatter_and_content(path)
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full_path = if Pathname(path).relative?
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File.join(app.source_dir, path)
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else
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path
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end
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data = {}
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return [data, nil] if !file_watcher.exists?(full_path) || ::Middleman::Util.binary?(full_path)
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content = File.read(full_path)
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begin
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if content =~ /\A.*coding:/
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lines = content.split(/\n/)
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lines.shift
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content = lines.join("\n")
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end
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result = parse_yaml_front_matter(content, full_path) || parse_json_front_matter(content, full_path)
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return result if result
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rescue
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# Probably a binary file, move on
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end
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[data, content]
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end
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def normalize_path(path)
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path.sub(%r{^#{Regexp.escape(app.source_dir)}\/}, '')
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end
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end
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end
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