Class: Usmu::Template::Layout

Inherits:
StaticFile show all
Defined in:
lib/usmu/template/layout.rb

Overview

Class to represent files templated with a Tilt library. Most of the custom rendering logic is contained here.

Direct Known Subclasses

Include, Page

Instance Attribute Summary collapse

Attributes inherited from StaticFile

#mtime, #name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from StaticFile

#==, #inspect

Methods included from Helpers::Indexer

included

Constructor Details

#initialize(configuration, name, metadata, type = nil, content = nil) ⇒ Layout

Returns a new instance of Layout.

Parameters:

  • configuration (Usmu::Configuration) —

    The configuration for the website we're generating.

  • name (String) —

    The name of the file in the source directory.

  • metadata (Hash) —

    The metadata for the file.

  • type (String) (defaults to: nil) —

    The type of template to use with the file. Used for testing purposes.

  • content (String) (defaults to: nil) —

    The content of the file. Used for testing purposes.



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# File 'lib/usmu/template/layout.rb', line 23

def initialize(configuration, name, metadata, type = nil, content = nil)
  super(configuration, name, metadata, type, content)

  if type.nil?
    type = name.split('.').last
    unless ::Tilt.default_mapping[type]
      raise "Templates of type '#{type}' aren't currently supported by Tilt. " +
            'Do you have the required gem installed?'
    end
  end
  @type = type
  path = File.join("#{content_path}", "#{name[0, name.length - type.length - 1]}")

  if content.nil?
    content = File.read("#{path}.#{type}")
  end
  @content = content

  @parent = Layout.find_layout(configuration, self.metadata['layout'])

  # Don't use the parent if it would result in weirdness
  unless @parent.nil?
    @parent = nil unless
        output_extension == @parent.output_extension || output_extension.nil? || @parent.output_extension.nil?
  end
end

Instance Attribute Details

#content_path ⇒ string (readonly, protected)

Returns the base path to the files used by this class.

This folder should be the parent folder for the file named by the name attribute.

Returns:

  • (string) —

    the base path to the files used by this class.

See Also:



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# File 'lib/usmu/template/layout.rb', line 201

def content_path
  @configuration.layouts_path
end

#helpers ⇒ Usmu::Template::Helpers (readonly, protected)

Returns the Helpers class to use as a scope for templates.

Returns:



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# File 'lib/usmu/template/layout.rb', line 207

def helpers
  @helpers ||= Usmu::Template::Helpers.new(@configuration, self)
end

#input_path ⇒ String (readonly)

Returns the full path to the file in the source directory.

Returns:

  • (String) —

    the full path to the file in the source directory



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# File 'lib/usmu/template/layout.rb', line 91

def input_path
  File.join(content_path, @name)
end

#metadata ⇒ Hash (readonly)

Returns the metadata associated with this layout.

This will include any metadata from parent templates and default metadata

Returns:

  • (Hash) —

    the metadata associated with this layout.



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# File 'lib/usmu/template/layout.rb', line 56

def metadata
  if @parent.nil?
    @configuration['default meta', default: {}].dup.deep_merge!(@metadata)
  else
    @parent.metadata.deep_merge!(@metadata)
  end
end

#output_extension ⇒ String (readonly)

Returns the extension to use with the output file.

Returns:

  • (String) —

    the extension to use with the output file.



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# File 'lib/usmu/template/layout.rb', line 97

def output_extension
  case @type
    when 'erb', 'rhtml', 'erubis', 'liquid'
      nil
    when 'coffee'
      'js'
    when 'less', 'sass', 'scss'
      'css'
    else
      'html'
  end
end

#output_filename ⇒ String (readonly)

Returns the filename to use for the output directory with any modifications to the input filename required.

Returns:

  • (String) —

    the filename to use in the output directory.



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# File 'lib/usmu/template/layout.rb', line 114

def output_filename
  if output_extension
    @name[0..@name.rindex('.')] + output_extension
  else
    @name[0..@name.rindex('.') - 1]
  end
end

#parent ⇒ Usmu::Template::Layout (readonly, protected)

Returns The template acting as a wrapper for this template, if any.

Returns:



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# File 'lib/usmu/template/layout.rb', line 168

def parent
  @parent
end

#provider_name ⇒ String (readonly, protected)

Returns the Tilt template engine's name for this layout.

This is used to determine which settings to use from the configuration file.

Returns:

  • (String) —

    the Tilt template engine's name for this layout



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# File 'lib/usmu/template/layout.rb', line 189

def provider_name
  Tilt.default_mapping.lazy_map[@type].select {|x| x[0] == template_class.name }.first[1].split('/').last
end

#template_class ⇒ Tilt::Template (readonly, protected)

Returns the Tilt template engine for this layout.

Returns:

  • (Tilt::Template) —

    the Tilt template engine for this layout



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# File 'lib/usmu/template/layout.rb', line 179

def template_class
  @template_class ||= ::Tilt.default_mapping[@type]
end

#type ⇒ String (readonly)

Returns the type of file this is. This is used to determine which template engine to use.

Returns:

  • (String) —

    the type of file this is. This is used to determine which template engine to use.



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# File 'lib/usmu/template/layout.rb', line 16

def type
  @type
end

Class Method Details

.find_layout(configuration, name) ⇒ Usmu::Layout

Static method to create a layout for a given configuration by it's name if it exists. This differs from #initialise in that it allows different types of values to be supplied as the name and will not fail if name is nil

Parameters:

  • configuration (Usmu::Configuration) —

    The configuration to use for the search

  • name (String) —

    If name is a string then search for a template with that name. Name here should not include file extension, eg. body not body.slim. If name is not a string then it will be returned verbatim. This means that name is nilable and can also be passed in as an Usmu::Template::Layout already for testing purposes.

Returns:

  • (Usmu::Layout) 


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# File 'lib/usmu/template/layout.rb', line 132

def self.find_layout(configuration, name)
  return nil if name.nil?

  if @layout_history[configuration][name]
    @log.debug(
        'Layout loop detected. Current loaded layouts: ' +
        @layout_history[configuration].inspect
    )
    return nil
  else
    @log.debug("Loading layout '#{name}'")
    @layout_history[configuration][name] = true
  end

  ret = search_layout(configuration, name)

  @layout_history[configuration][name] = nil
  return ret
end

.is_valid_file?(folder_type, name) ⇒ Boolean

Tests if a given file is a valid Tilt template based on the filename.

Parameters:

  • folder_type (String) —

    One of "source" or "layout" depending on where the template is in the source tree. Not used by Usmu::Template::Layout directly but intended to be available for future API.

  • name (String) —

    The filename to be tested.

Returns:

  • (Boolean) 


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# File 'lib/usmu/template/layout.rb', line 159

def self.is_valid_file?(folder_type, name)
  type = name.split('.').last
  ::Tilt.default_mapping[type] ? true : false
end

.search_layout(configuration, name) ⇒ Usmu::Template::Layout (private)

Returns:

See Also:

  • #find_layout


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# File 'lib/usmu/template/layout.rb', line 252

def self.search_layout(configuration, name)
  if name === 'none' || name.nil?
    return nil
  elsif name.class.name == 'String'
    layouts_path = configuration.layouts_path
    Dir["#{layouts_path}/#{name}.*"].each do |f|
      filename = File.basename(f)
      if filename != "#{name}.meta.yml"
        path = f[(layouts_path.length + 1)..f.length]
        return new(configuration, path, configuration.layouts_metadata.metadata(path))
      end
    end
  else
    return name
  end
end

Instance Method Details

#[]=(index, value) ⇒ void (protected)

Allows for protected level direct access to the metadata store.

See Also:



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# File 'lib/usmu/template/layout.rb', line 173

def []=(index, value)
  @metadata[index] = value
end

#add_template_defaults(overrides, engine) ⇒ Hash (protected)

Adds defaults for the given generator engine

Parameters:

  • overrides (Hash) —

    A hash of options provided by the user

  • engine (String) —

    The name of the rendering engine

Returns:

  • (Hash) —

    Template options to pass into the engine



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# File 'lib/usmu/template/layout.rb', line 216

def add_template_defaults(overrides, engine)
  case engine
    when 'redcarpet'
      if overrides.delete :pygments
        begin
          require 'pygments'
          overrides[:renderer] = Class.new(::Redcarpet::Render::HTML) do
            def block_code(code, language)
              Pygments.highlight(code, lexer: language)
            end
          end
        rescue LoadError
          @log.warn('Unable to load pygments.rb gem.')
        end
        overrides
      end
    when 'sass'
      {
          :load_paths => [@configuration.source_path + '/' + File.dirname(@name)]
      }.deep_merge!(overrides)
    else
      overrides
  end
end

#get_variables(variables) ⇒ Hash (private)

Utility function which collates variables to pass to the template engine.

Returns:

  • (Hash) 


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# File 'lib/usmu/template/layout.rb', line 246

def get_variables(variables)
  {'site' => @configuration}.deep_merge!(metadata).deep_merge!(variables)
end

#render(variables = {}) ⇒ String

Renders the file with any templating language required and returns the result

Parameters:

  • variables (Hash) (defaults to: {}) —

    Variables to be used in the template.

Returns:

  • (String) —

    The rendered file.



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# File 'lib/usmu/template/layout.rb', line 68

def render(variables = {})
  content = render_content(variables)
  has_cr = content.index("\r")
  content += (has_cr ? "\r\n" : "\n") if content[-1] != "\n"

  if @parent.nil?
    content
  else
    @parent.render({'content' => content})
  end
end

#render_content(variables = {}) ⇒ String

Renders the internal content of the file with any templating language required and returns the result

Parameters:

  • variables (Hash) (defaults to: {}) —

    Variables to be used in the template.

Returns:

  • (String) —

    The rendered content.



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# File 'lib/usmu/template/layout.rb', line 84

def render_content(variables = {})
  template_config = add_template_defaults((@configuration[provider_name] || {}).clone, provider_name)
  template_class.new("#{@name}", 1, template_config) { @content }.render(helpers, get_variables(variables))
end