dialogue.rb: Add debug mode and results

- Dialogue can show some additional, generally hidden details about what's on
  screen.
- New attribute :debug (Boolean)
- Added debug information

lib/sapling/dialogue.rb

@@ -9,8 +9,12 @@ module Dialogue
     # The file, which should be a dialogue tree YAML file.
     attr_accessor :file
 
+    # Status of verbose/debug mode. True = on; false = off.
+    attr_accessor :debug
+
     def initialize
       @file = ""
+      @debug = false
     end
 
     # Conversation handles navigating the tree, until the option to end is
@@ -19,12 +23,14 @@ module Dialogue
       tree = Gardner.grow(@file)
 
       10.times { print "*" }
+      puts "\n[ Branch: 1 ]" if @debug
       next_branch = talk(tree[1])
       until next_branch == 0 do
+        puts "\n[ Branch: #{next_branch} ]" if @debug
         next_branch = talk(tree[next_branch])
       end
 
-      puts tree[0]["desc"]
+      puts "\n#{tree[0]["desc"]}"
       exit
     end
 
@@ -33,6 +39,7 @@ module Dialogue
     # @param branch [Hash] A branch data set
     # @return [Integer] The number of the next branch
     def talk(branch)
+
       # If there are no options on this branch, we assume it's a terminal
       # branch. Return 0, and end the program.
       if branch["options"].empty?
@@ -45,21 +52,24 @@ module Dialogue
       puts "\n#{branch["desc"]}\n\n"
       branch["options"].each_pair do |k,v|
         puts "\t#{k}: #{v.keys[0]}"
+        puts "\t\t [ Goes to branch #{v.values[0]} ]" if @debug
       end
 
       print "\n[#{valid_options}]> "
       STDOUT.flush
       response = STDIN.gets.chomp.to_i
 
-      until branch["options"].keys.include?(response)
+      until branch["options"].keys.include?(response) or response == 0
         print "[## Invalid options. "
         print "Valid options are #{valid_options}, or 0 to exit."
         print "\n[#{valid_options}]> "
         response = STDIN.gets.chomp.to_i
       end
 
+
       puts "\n"
       10.times { print "*" }
+      return 0 if response == 0
       puts "\n(Your choice: #{branch["options"][response].keys[0]})"
       return branch["options"][response].values[0].to_i
     end