class Jekyll::PathManager
A singleton class that caches frozen instances of path strings returned from its methods.
NOTE:
This class exists because `File.join` allocates an Array and returns a new String on every call using **the same arguments**. Caching the result means reduced memory usage. However, the caches are never flushed so that they can be used even when a site is regenerating. The results are frozen to deter mutation of the cached string. Therefore, employ this class only for situations where caching the result is necessary for performance reasons.
Public Class Methods
join(base, item)
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Wraps `File.join` to cache the frozen result. Reassigns `nil`, empty strings and empty arrays to a frozen empty string beforehand.
Returns a frozen string.
# File lib/jekyll/path_manager.rb, line 23 def self.join(base, item) base = "" if base.nil? || base.empty? item = "" if item.nil? || item.empty? @join ||= {} @join[base] ||= {} @join[base][item] ||= File.join(base, item).freeze end