method

longest_common_subpath

v6.0.0 - Show latest stable - 0 notes - Class: PathHelper

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longest_common_subpath(paths) public

Given a collection of Pathname objects returns the longest subpath common to all of them, or nil if there is none.

# File activesupport/lib/active_support/evented_file_update_checker.rb, line 179
        def longest_common_subpath(paths)
          return if paths.empty?

          lcsp = Pathname.new(paths[0])

          paths[1..-1].each do |path|
            until ascendant_of?(lcsp, path)
              if lcsp.root?
                # If we get here a root directory is not an ascendant of path.
                # This may happen if there are paths in different drives on
                # Windows.
                return
              else
                lcsp = lcsp.parent
              end
            end
          end

          lcsp
        end

longest_common_subpath

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