Ferret

Putting It All Together

The next step is to parse the options. None of this code is really relevant to our study of Ferret right now. It is simply an example of using the getoptlong and ostruct standard libraries. For the sake of completeness, though, we’ll show the whole of ferretfind here. If you are interested, the option parsing code is from 49 to 114:

  0 #!/usr/bin/env ruby
  1 require 'rubygems'
  2 require 'ferret'
  3 require 'optparse'
  4 require 'ostruct'
  5 require 'dbm'
  6 
  7 module FerretFind
  8   class Reader
  9     @@subclasses = []
 10     @@readers = {}
 11 
 12     def Reader.inherited(subclass)
 13       @@subclasses << subclass
 14     end
 15 
 16     def Reader.load_readers(field_infos) 
 17       @@subclasses.each do |subclass|
 18         reader = subclass.new(field_infos)
 19         subclass::EXTENSIONS.each do |ext|
 20           @@readers[ext.downcase] = reader
 21         end
 22       end
 23     end
 24 
 25     def Reader.get_reader(path) 
 26       @@readers[(File.extname(path)[/[^.]+/]||"").downcase]
 27     end
 28 
 29     def Reader.read(path) 
 30       document = {
 31         :path     => path,
 32         :accessed => File.atime(path).strftime("%Y%m%d"),
 33         :modified => File.mtime(path).strftime("%Y%m%d")
 34       }
 35       if File.readable?(path) and reader = Reader.get_reader(path) 
 36         document.merge!(reader.read(path))
 37       end
 38       return document
 39     end
 40 
 41     protected
 42       def initialize(field_infos); end           
 43       def read(path); {} end                     
 44       def add_field(field_infos, field, options) 
 45         field_infos.add_field(field, options) unless field_infos[field]
 46       end
 47   end
 48 end