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RGen::Util::CachedGlob

WARNING: the mechanism of taking timestamps of directories in order to find out if the content has changed doesn't work reliably across all kinds of filesystems

Public Class Methods

new(dir_glob, file_glob) click to toggle source 
# File lib/rgen/util/cached_glob.rb, line 10
def initialize(dir_glob, file_glob)
  @dir_glob = dir_glob
  @file_glob = file_glob
  @root_dirs = []
  @dirs = {}
  @files = {}
  @timestamps = {}
end

Public Instance Methods

glob() click to toggle source

returns all files contained in directories matched by dir_glob which match file_glob. file_glob must be relative to dir_glob. dir_glob "*/a" with file_glob "*/.txt" is basically equivalent with Dir.glob("/a//.txt") the idea is that the file glob will only be re-eavluated when the content of one of the directories matched by dir_glob has changed. this will only be faster than a normal Dir.glob if the number of dirs matched by dir_glob is relatively large and changes in files affect only a few of them at a time.

# File lib/rgen/util/cached_glob.rb, line 26
def glob
  root_dirs = Dir.glob(@dir_glob)
  (@root_dirs - root_dirs).each do |d|
    remove_root_dir(d)
  end
  (@root_dirs & root_dirs).each do |d|
    update_root_dir(d) if dir_changed?(d)
  end
  (root_dirs - @root_dirs).each do |d|
    update_root_dir(d)
  end
  @root_dirs = root_dirs
  @root_dirs.sort.collect{|d| @files[d]}.flatten
end

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