Class: FunWith::Files::Watchers::DirectoryWatcher

Inherits:
NodeWatcher
  • Object
show all
Defined in:
lib/fun_with/files/watchers/directory_watcher.rb

Instance Attribute Summary

Attributes inherited from NodeWatcher

#path

Instance Method Summary collapse

Methods inherited from NodeWatcher

#create_watchers, #new_changeset, #set_path

Constructor Details

#initialize(path) ⇒ DirectoryWatcher

Returns a new instance of DirectoryWatcher.



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# File 'lib/fun_with/files/watchers/directory_watcher.rb', line 5

def initialize( path )
  set_path( path )
  @watchers = create_watchers( self.path.entries )
end

Instance Method Details

#all_paths ⇒ Object 



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# File 'lib/fun_with/files/watchers/directory_watcher.rb', line 61

def all_paths
  @watchers.map{|path, watcher| watcher.all_paths }.flatten + [self.path]
end

#find_new_files ⇒ Object 



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# File 'lib/fun_with/files/watchers/directory_watcher.rb', line 38

def find_new_files
  # next, get the updated list of files/folders beneath this directory
  current_paths = self.path.entries

  for path in current_paths
    unless @watchers.has_key?( path )
      w = Watcher.factory( path )
    
      report_files( w.all_paths, :created )

      @watchers[path] = w
    end
  end
end

#report_files(paths, status) ⇒ Object

modify the current list of changes by adding “deleted” for every file/folder below this one.



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# File 'lib/fun_with/files/watchers/directory_watcher.rb', line 55

def report_files( paths, status )  
  for path in paths
    @changes[path] = status
  end 
end

#update ⇒ Object

returns a hash of changes



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# File 'lib/fun_with/files/watchers/directory_watcher.rb', line 12

def update
  new_changeset do
    if self.path.exist?
      update_existing_files
      find_new_files
    else
      # If the directory is gone, you can assume the same is true
      # for all the files it held.  
      report_files( self.all_paths, :deleted )
    end
  end
end

#update_existing_files ⇒ Object 



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# File 'lib/fun_with/files/watchers/directory_watcher.rb', line 25

def update_existing_files
  # first, check on the files we're supposed to be keeping track of
  for path, watcher in @watchers
    @changes[path] = :deleted unless path.exist?
    @changes.merge!( watcher.update )
  
    # While the main Watcher will continue to monitor the places it's
    # been told, even if they're missing, the subwatchers just disappear
    # when the files they're watching do.
    @watchers.delete( path ) unless path.exist?
  end
end