dialogue.rb: Rubocop fixes and refactor changes

- Fix several Rubocop problems
- Update module for gardner refactor
    - Update all tree references to now reference Gardner::Plot object

lib/sapling/dialogue.rb

@@ -2,16 +2,15 @@ require_relative './gardner'
 
 # Dialogue is the module for traversing an existing tree.
 module Dialogue
-
   # Format and display the trunk
   #
   # @param trunk [Hash] The trunk hash
   # @param debug [Boolean] The status of showing debug information
-  def self.display_trunk(trunk, debug=false)
-    40.times { print "-" }
+  def self.display_trunk(trunk, debug = false)
+    40.times { print '-' }
     puts "\n[ Trunk ]\n" if debug
-    puts "\n#{trunk["trunk"]}"
-    40.times { print "-" }
+    puts "\n#{trunk['trunk']}"
+    40.times { print '-' }
     puts "\n"
   end
 
@@ -20,11 +19,11 @@ module Dialogue
   # @param branch [Hash] A branch data set
   # @param branch_no [Integer] The branch number
   # @param debug [Boolean] Status of showing debug information
-  def self.display_branch(branch, branch_no, debug=false)
+  def self.display_branch(branch, branch_no, debug = false)
     puts "\n[ Branch: #{branch_no} ]" if debug
-    puts "\n#{branch["desc"]}\n\n"
+    puts "\n#{branch['desc']}\n\n"
 
-    branch["options"].each_pair do |k,v|
+    branch['options'].each_pair do |k, v|
       puts "\t#{k}: #{v.keys[0]}"
       puts "\t\t[ Goes to branch #{v.values[0]} ]\n" if debug
     end
@@ -32,30 +31,27 @@ module Dialogue
 
   # Speaker holds the functionality for going through a dialogue tree.
   class Speaker
-    # The file, which should be a dialogue tree YAML file.
-    attr_accessor :file
+    # The tree, an instance of Gardner::Plot
+    attr_reader :tree
     # Status of verbose/debug mode. True = on; false = off.
-    attr_accessor :debug
+    attr_reader :debug
 
-    def initialize(file="", debug=false)
-      @file = file
+    def initialize(tree, debug = false)
+      @tree = tree
       @debug = debug
     end
 
     # Conversation handles navigating the tree, until the option to end is
     # reached.
-    def conversation()
-      tree = Gardner.prune_trunk(@file)
-
-      Dialogue.display_trunk(tree[0], false)
-      branches = Gardner.prune_branches(tree[1])
+    def conversation
+      Dialogue.display_trunk(@tree.trunk, @debug)
 
       next_branch = 1
-      until next_branch == 0 do
-        next_branch = talk(branches[next_branch], next_branch)
+      until next_branch.zero?
+        next_branch = talk(@tree.branches[next_branch], next_branch)
       end
 
-      puts "\n#{branches[0]["desc"]}"
+      puts "\n#{@tree.branches[0]['desc']}"
       exit
     end
 
@@ -65,25 +61,18 @@ module Dialogue
     # @param branch_no [Integer] The branch number
     # @return [Integer] The number of the next branch
     def talk(branch, branch_no)
-      # 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?
-        puts "\n#{branch["desc"]}\n\n"
-        return 0
-      end
+      return 0 if terminal?(branch)
 
       Dialogue.display_branch(branch, branch_no, @debug)
 
       response = get_response(branch)
 
-      unless response == 0
-        puts "\n"
-        10.times { print "*" }
-        puts "\n(Your choice: #{branch["options"][response].keys[0]})"
-        response = branch["options"][response].values[0].to_i
+      unless response.zero?
+        puts "(Your choice: #{branch['options'][response].keys[0]})"
+        response = branch['options'][response].values[0].to_i
       end
 
-      return response
+      response
     end
 
     # Get a response for the displayed branch
@@ -91,20 +80,33 @@ module Dialogue
     # @param branch [Hash] A branch data set
     # @return [Integer] the next branch
     def get_response(branch)
-      valid_options = branch["options"].keys.join(", ")
+      valid_options = branch['options'].keys.join(', ')
 
       print "\n[#{valid_options}]> "
       STDOUT.flush
       response = STDIN.gets.chomp.to_i
 
-      until branch["options"].keys.include?(response) or response == 0
-        print "[## Invalid options. "
+      until branch['options'].keys.include?(response) || response.zero?
+        print '[## Invalid options. '
         print "Valid options are #{valid_options}, or 0 to exit."
         print "\n[#{valid_options}]> "
         response = STDIN.gets.chomp.to_i
       end
 
-      return response
+      response
+    end
+
+    # Check if a branch is terminal
+    #
+    # @param branch [Hash] A branch data set
+    # @return [Boolean] true if the branch is terminal, false otherwise
+    def terminal?(branch)
+      if branch['options'].empty?
+        puts "\n#{branch['desc']}\n\n"
+        return true
+      end
+
+      false
     end
   end
 end