Class: Chisel::View

Inherits:
Object
  • Object
show all
Defined in:
lib/chisel/view.rb

Constant Summary collapse

MarkupExtensions = 
['erb', 'md', 'textile']
@@cache = 
[]
@@output_paths = 
[]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ View

Returns a new instance of View.



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# File 'lib/chisel/view.rb', line 22

def initialize(options={})

	# Do not call the initializer directly; use View.fetch(options)
	# to take advantage of view caching

	@path = Pathname.new(options[:path]) if options[:path]
	@site_dir = SiteDirectory.new(options[:site_dir]) if options[:site_dir]
	
	if options[:resource]
		@type = :resource
		@resource = options[:resource]
		@view = options[:view]
		@path = @site_dir.resource_type_view_path(@resource, @view)
	elsif options[:layout]
		@type = :layout
		@view = options[:layout]
		@path = @site_dir.layout_view_path(@view)
	elsif options[:view]
		@view = options[:view]
		@path = @site_dir.view_path(@view)
	end

	raise 'Cannot initialize view without a path' unless @path

	@raw_content = File.read(@path)
	@@cache << self

end

Instance Attribute Details

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/chisel/view.rb', line 10

def path
  @path
end

#raw_content ⇒ Object

Returns the value of attribute raw_content.



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# File 'lib/chisel/view.rb', line 10

def raw_content
  @raw_content
end

#resource ⇒ Object

Returns the value of attribute resource.



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# File 'lib/chisel/view.rb', line 10

def resource
  @resource
end

#site_dir ⇒ Object

Returns the value of attribute site_dir.



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# File 'lib/chisel/view.rb', line 10

def site_dir
  @site_dir
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/chisel/view.rb', line 10

def type
  @type
end

#view ⇒ Object

Returns the value of attribute view.



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# File 'lib/chisel/view.rb', line 10

def view
  @view
end

Class Method Details

.fetch(options = {}) ⇒ Object 



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# File 'lib/chisel/view.rb', line 14

def self.fetch(options={})
	@@cache.each do |view|
		return view if view.matches(options)
	end

	return View.new(options)
end

Instance Method Details

#evaluate(output_path, options = {}) ⇒ Object 



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# File 'lib/chisel/view.rb', line 85

def evaluate(output_path, options = {})

	if @type == :layout
		puts "Evaluating layout for #{output_path}..."
	else
		puts "Evaluating #{output_path}..."
	end
	
	helper = ViewHelper.new(@site_dir, output_path)
	
	# First evaluate header as ERB if necessary
	
	header_vars = {}
	if options[:resource]
		resource_key = options[:resource].resource_type.to_sym
		header_vars[resource_key] = options[:resource]
		header_vars[:resource] = options[:resource]
	end
	
	header_binding = header_vars.to_binding(helper)
	header_string = ERB.new(YAML.header_string(@raw_content)).result(header_binding)
	if header_string == ''
		header = {}
	else
		header = YAML.load(header_string).symbolize_keys
	end
	
	# Maintin the binding if we were passed one; otherwise,
	# create a brand new binding from our header info

	if options[:binding]
		content_binding = options[:binding]
	
		# Overwrite layout that was passed in
		if header[:layout]
			content_binding.eval("layout = '#{header[:layout]}'")
		else
			content_binding.eval("layout = nil")
		end
	
	else
	
		if options[:locals]
			vars = header.merge(options[:locals])
		else
			vars = header.clone
		end
		vars[:content] = nil
		vars[:layout] = nil unless vars.key?(:layout)
	
		if options[:resource]
			resource_key = options[:resource].resource_type.to_sym
			vars[resource_key] = options[:resource]
			vars[:resource] = options[:resource] # alias as "resource"
		end
	
		content_binding = vars.to_binding(helper)
	
	end

	# Evaluate the content with appropriate markup and ERB
	
	content = YAML.remove_header(@raw_content)
	
	markup_extensions.reverse.each do |extension|
		case extension.downcase
		when 'erb'
			content = ERB.new(content).result(content_binding)
		when 'textile'
			begin
				require 'RedCloth'
			rescue LoadError
				puts "
The RedCloth gem is required to evaluate Textile markup. Please run:

  gem install RedCloth"
				exit
			end
			content = RedCloth.new(content).to_html
		when 'md'
			begin
				require 'maruku'
			rescue LoadError
				puts "
The Maruku gem is required to evaluate Markdown markup. Please run:

  gem install maruku"
				exit
			end
			content = Maruku.new(content).to_html
		end
	end

	# Now evaluate the layout

	if content_binding.eval('layout')
		content_binding.eval("content = <<EOS\n#{content}\nEOS")
		layout_view = View.fetch(:layout => content_binding.eval('layout'), :site_dir => @site_dir)
		content = layout_view.evaluate(output_path, :binding => content_binding)
	end

	content
end

#matches(options = {}) ⇒ Object 



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# File 'lib/chisel/view.rb', line 51

def matches(options = {})

	return true if options.key?(:resource) and @type == :resource and @view == options[:view] and @resource == options[:resource]
	return true if options.key?(:layout) and @type == :layout and @view == options[:layout]
	return true if @path == options[:path]

	return false

end

#run(options = {}) ⇒ Object 



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# File 'lib/chisel/view.rb', line 61

def run(options = {})
	if options[:output_path] then
		output_path = options[:output_path]
	else
		view_relative_dir = @path.relative_path_from(@site_dir).dirname
		file_output_dir = @site_dir.output_dir.join(view_relative_dir)
		file_output_dir.mkpath
		output_path = file_output_dir.join(output_basename)
	end

	return if @@output_paths.index(output_path)
	@@output_paths << output_path

	FileUtils.mkdir_p(output_path.dirname)

	result = evaluate(output_path, options)

	f = File.new(output_path, 'w')
	f.write(result)
	f.close

	result
end