120 lines
3.5 KiB
Ruby
120 lines
3.5 KiB
Ruby
require 'tilt'
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require 'active_support/core_ext/string/output_safety'
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module Middleman
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class FileRenderer
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def self.cache
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@_cache ||= ::Tilt::Cache.new
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end
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delegate :cache, :to => :"self.class"
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def initialize(app, path)
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@app = app
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@path = path.to_s
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end
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# Render an on-disk file. Used for everything, including layouts.
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#
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# @param [Hash] locs
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# @param [Hash] opts
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# @param [Class] context
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# @return [String]
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def render(locs = {}, opts = {}, context, &block)
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path = @path.dup
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# Detect the remdering engine from the extension
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extension = File.extname(path)
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engine = extension[1..-1].to_sym
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# Store last engine for later (could be inside nested renders)
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context.current_engine, engine_was = engine, context.current_engine
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# Save current buffer for later
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_buf_was = context.save_buffer
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# Read from disk or cache the contents of the file
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body = if opts[:template_body]
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opts.delete(:template_body)
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else
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get_template_data_for_file
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end
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# Merge per-extension options from config
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extension = File.extname(path)
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options = opts.dup.merge(options_for_ext(extension))
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options[:outvar] ||= '@_out_buf'
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options.delete(:layout)
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# Overwrite with frontmatter options
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options = options.deep_merge(options[:renderer_options]) if options[:renderer_options]
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template_class = ::Tilt[path]
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# Allow hooks to manipulate the template before render
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@app.class.callbacks_for_hook(:before_render).each do |callback|
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newbody = callback.call(body, path, locs, template_class)
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body = newbody if newbody # Allow the callback to return nil to skip it
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end
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# Read compiled template from disk or cache
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template = cache.fetch(:compiled_template, extension, options, body) do
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::Tilt.new(path, 1, options) { body }
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end
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# Render using Tilt
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content = template.render(context, locs, &block)
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# Allow hooks to manipulate the result after render
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@app.class.callbacks_for_hook(:after_render).each do |callback|
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content = callback.call(content, path, locs, template_class)
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end
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output = ::ActiveSupport::SafeBuffer.new ''
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output.safe_concat content
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output
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ensure
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# Reset stored buffer
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context.restore_buffer(_buf_was)
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context.current_engine = engine_was
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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 get_template_data_for_file
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if @app.extensions[:front_matter]
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@app.extensions[:front_matter].template_data_for_file(@path)
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else
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File.read(File.expand_path(@path, source_dir))
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end
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end
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protected
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# Get a hash of configuration options for a given file extension, from
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# config.rb
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#
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# @param [String] ext
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# @return [Hash]
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def options_for_ext(ext)
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# Read options for extension from config/Tilt or cache
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cache.fetch(:options_for_ext, ext) do
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options = {}
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# Find all the engines which handle this extension in tilt. Look for
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# config variables of that name and merge it
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extension_class = ::Tilt[ext]
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::Tilt.mappings.each do |mapping_ext, engines|
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next unless engines.include? extension_class
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engine_options = @app.config[mapping_ext.to_sym] || {}
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options.merge!(engine_options)
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end
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options
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end
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end
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end
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end
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