class Giver
require 'find'

#	get_filename_part returns an array of the $1 portion
# of the	match between filenames
#	under root_path and the regular expression frx, sorted by
#	frequency of occurrence
  def get_filename_part(public_path,frx)
	char_freq={} #possible_chars and their frequency of
#			occurrence in picture file_names
	char_freq.default=0
	out_array=[]
	begin
	Find.find(File.join(Dir.pwd,'public',
						public_path)) do|path|
#		if FileTest.directory?(path) and
		if (File.basename(path)[0] == ?.)
      			Find.prune # Don't look any further into
      			#this directory.
		elsif !FileTest.directory?(path) &&
						path.match(frx)
			found=$1
#			p "found #{found}/#{path}"
			char_freq[found.upcase]+=1
			if char_freq[found.upcase]==1
				out_array << found #n!cdew item, disregarding case
			end
#so that we
#					preserve case for file names
		end
	end
	rescue Exception
	out_array=	 ["error in getting files #{$!}"]
	end
  out_array.sort{|b,a| char_freq[a]<=>char_freq[b]}
  end
	#get_subdirs returns array of subdirectories under
	# "public" that do not
	# begin with a period
  def get_subdirs(root_dir)
	c=Dir.entries(File.join(Dir.pwd,'public',root_dir))
  	#don't want items containing .
  	c.reject!{|d| d=~/\./}
  	c
  end
end