refactored markov to be clearer

examples/word_count/markov

@@ -1,28 +1,32 @@
 #!/usr/bin/env ruby
 
-require '../../couchrest'
+require File.expand_path(File.dirname(__FILE__)) + '/../../couchrest'
 
 cr = CouchRest.new("http://localhost:5984")
-db = cr.database('word-count-example')
+@db = cr.database('word-count-example')
+@word_memoizer = {}
+
+def probable_follower_for(word)
+  @word_memoizer[word] ||= @db.view('markov/chain-reduce', :startkey => [word,nil], :endkey => [word,{}],:group_level => 2)
+  
+  # puts
+  # puts "search #{word} #{wprobs[word]['rows'].length}"
+  # @word_memoizer[word]['rows'].sort_by{|r|r['value']}.each{|r|puts [r['value'],r['key']].inspect}
+  
+  rows = @word_memoizer[word]['rows'].select{|r|(r['key'][1]!='')}.sort_by{|r|r['value']}
+  row = rows[(-1*[rows.length,5].min)..-1].sort_by{rand}[0]
+  row ? row['key'][1] : nil
+end
+
 
 word = ARGV[0]
 words = [word]
-wprobs = {}
 
 while word
   $stdout.print ' ' if words.length > 1
   $stdout.print word
   $stdout.flush
-  
-  wprobs[word] ||= db.view('markov/chain-reduce', :startkey => [word,nil], :endkey => [word,{}],:group_level => 2)
-
-  # puts
-  # puts "search #{word} #{wprobs[word]['rows'].length}"
-  # wprobs[word]['rows'].sort_by{|r|r['value']}.each{|r|puts [r['value'],r['key']].inspect}
-
-  rows = wprobs[word]['rows'].select{|r|(r['key'][1]!='')}.sort_by{|r|r['value']}
-  row = rows[(-1*[rows.length,5].min)..-1].sort_by{rand}[0]
-  word = row ? row['key'][1] : nil
+  word = probable_follower_for(word)
   words << word
 end