Class: Jekyll::Regenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/jekyll/regenerator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(site) ⇒ Regenerator 



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# File 'lib/jekyll/regenerator.rb', line 5

def initialize(site)
  @site = site

  # Read metadata from file
  read_metadata

  # Initialize cache to an empty hash
  clear_cache
end

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



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# File 'lib/jekyll/regenerator.rb', line 3

def cache
  @cache
end

#metadata ⇒ Object (readonly)

Returns the value of attribute metadata.



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# File 'lib/jekyll/regenerator.rb', line 3

def metadata
  @metadata
end

#site ⇒ Object (readonly)

Returns the value of attribute site.



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# File 'lib/jekyll/regenerator.rb', line 3

def site
  @site
end

Instance Method Details

#add(path) ⇒ Object

Add a path to the metadata

Returns true, also on failure.



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# File 'lib/jekyll/regenerator.rb', line 40

def add(path)
  return true unless File.exist?(path)

  metadata[path] = {
    "mtime" => File.mtime(path),
    "deps" => []
  }
  cache[path] = true
end

#add_dependency(path, dependency) ⇒ Object

Add a dependency of a path

Returns nothing.



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# File 'lib/jekyll/regenerator.rb', line 119

def add_dependency(path, dependency)
  return if (metadata[path].nil? || @disabled)

  if !metadata[path]["deps"].include? dependency
    metadata[path]["deps"] << dependency
    add(dependency) unless metadata.include?(dependency)
  end
  regenerate? dependency
end

#clear ⇒ Object

Clear the metadata and cache

Returns nothing



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# File 'lib/jekyll/regenerator.rb', line 60

def clear
  @metadata = {}
  clear_cache
end

#clear_cache ⇒ Object

Clear just the cache

Returns nothing



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# File 'lib/jekyll/regenerator.rb', line 69

def clear_cache
  @cache = {}
end

#disabled? ⇒ Boolean

Check if metadata has been disabled

Returns a Boolean (true for disabled, false for enabled).



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# File 'lib/jekyll/regenerator.rb', line 148

def disabled?
  @disabled = !site.incremental? if @disabled.nil?
  @disabled
end

#force(path) ⇒ Object

Force a path to regenerate

Returns true.



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# File 'lib/jekyll/regenerator.rb', line 53

def force(path)
  cache[path] = true
end

#metadata_file ⇒ Object

Produce the absolute path of the metadata file

Returns the String path of the file.



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# File 'lib/jekyll/regenerator.rb', line 141

def metadata_file
  site.in_source_dir('.jekyll-metadata')
end

#modified?(path) ⇒ Boolean

Checks if a path’s (or one of its dependencies) mtime has changed

Returns a boolean.



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# File 'lib/jekyll/regenerator.rb', line 86

def modified?(path)
  return true if disabled?

  # objects that don't have a path are always regenerated
  return true if path.nil?

  # Check for path in cache
  if cache.has_key? path
    return cache[path]
  end

  # Check path that exists in metadata
  data = metadata[path]
  if data
    data["deps"].each do |dependency|
      if modified?(dependency)
        return cache[dependency] = cache[path] = true
      end
    end
    if File.exist?(path) && data["mtime"].eql?(File.mtime(path))
      return cache[path] = false
    else
      return add(path)
    end
  end

  # Path does not exist in metadata, add it
  return add(path)
end

#regenerate?(document) ⇒ Boolean

Checks if a renderable object needs to be regenerated

Returns a boolean.



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# File 'lib/jekyll/regenerator.rb', line 18

def regenerate?(document)
  case document
  when Page
    document.asset_file? || document.data['regenerate'] ||
      source_modified_or_dest_missing?(
        site.in_source_dir(document.relative_path), document.destination(@site.dest)
      )
  when Document
    !document.write? || document.data['regenerate'] ||
      source_modified_or_dest_missing?(
        document.path, document.destination(@site.dest)
      )
  else
    source_path = document.respond_to?(:path)        ? document.path                    : nil
    dest_path   = document.respond_to?(:destination) ? document.destination(@site.dest) : nil
    source_modified_or_dest_missing?(source_path, dest_path)
  end
end

#source_modified_or_dest_missing?(source_path, dest_path) ⇒ Boolean

Checks if the source has been modified or the destination is missing

returns a boolean



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# File 'lib/jekyll/regenerator.rb', line 78

def source_modified_or_dest_missing?(source_path, dest_path)
  modified?(source_path) || (dest_path and !File.exist?(dest_path))
end

#write_metadata ⇒ Object

Write the metadata to disk

Returns nothing.



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# File 'lib/jekyll/regenerator.rb', line 132

def write_metadata
  unless disabled?
    File.binwrite(metadata_file, Marshal.dump(metadata))
  end
end