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# frozen_string_literal: true
module Jekyll
class Plugin
PRIORITIES = {
:low => -10,
:highest => 100,
:lowest => -100,
:normal => 0,
:high => 10,
}.freeze
#
def self.inherited(const)
catch_inheritance(const) do |const_|
catch_inheritance(const_)
end
end
#
def self.catch_inheritance(const)
const.define_singleton_method :inherited do |const_|
(@children ||= Set.new).add const_
yield const_ if block_given?
end
end
#
def self.descendants
@children ||= Set.new
out = @children.map(&:descendants)
out << self unless superclass == Plugin
Set.new(out).flatten
end
# Get or set the priority of this plugin. When called without an
# argument it returns the priority. When an argument is given, it will
# set the priority.
#
# priority - The Symbol priority (default: nil). Valid options are:
# :lowest, :low, :normal, :high, :highest
#
# Returns the Symbol priority.
def self.priority(priority = nil)
@priority ||= nil
@priority = priority if priority && PRIORITIES.key?(priority)
@priority || :normal
end
# Get or set the safety of this plugin. When called without an argument
# it returns the safety. When an argument is given, it will set the
# safety.
#
# safe - The Boolean safety (default: nil).
#
# Returns the safety Boolean.
def self.safe(safe = nil)
@safe = safe unless defined?(@safe) && safe.nil?
@safe || false
end
# Spaceship is priority [higher -> lower]
#
# other - The class to be compared.
#
# Returns -1, 0, 1.
def self.<=>(other)
PRIORITIES[other.priority] <=> PRIORITIES[priority]
end
# Spaceship is priority [higher -> lower]
#
# other - The class to be compared.
#
# Returns -1, 0, 1.
def <=>(other)
self.class <=> other.class
end
# Initialize a new plugin. This should be overridden by the subclass.
#
# config - The Hash of configuration options.
#
# Returns a new instance.
def initialize(config = {})
# no-op for default
end
end
end
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