Initial functionality to show resource replace

Still need to add all the resource property changes that could trigger a
replacement.  For now, only does HostedZone.Name

lib/convection/model/diff.rb

@@ -12,23 +12,38 @@ class Diff
       attr_reader :action
       attr_reader :ours
       attr_reader :theirs
-      colorize :action, :green => [:create], :yellow => [:update], :red => [:delete]
+      colorize :action, :green => [:create], :yellow => [:update], :red => [:delete, :replace]
+
+      # Properties for which a change requires a replacement
+      # (as opposed to an in-place update)
+      REPLACE_PROPERTIES = [
+        "AWS::Route53::HostedZone.Name",
+        # TODO: Add more
+      ]
 
       def initialize(key, ours, theirs)
         @key = key
         @ours = ours
         @theirs = theirs
 
-        @action = if ours && theirs then :update
-                  elsif ours then :create
-                  else :delete
-                  end
+        @action = :delete
+        if ours && theirs
+          property_name = key[/AWS::[A-Za-z0-9:]+\.[A-Za-z0-9]+/]
+          if REPLACE_PROPERTIES.include? property_name
+            @action = :replace
+          else
+            @action = :update
+          end
+        elsif ours
+          @action = :create
+        end
       end
 
       def to_thor
         message = case action
                   when :create then "#{ key }: #{ ours }"
                   when :update then "#{ key }: #{ theirs } => #{ ours }"
+                  when :replace then "#{ key }: #{ theirs } => #{ ours }"
                   when :delete then key
                   end
 

lib/convection/model/mixin/colorize.rb

@@ -9,7 +9,7 @@ def colorize(param, options = {})
             when *options.fetch(:cyan, [:debug, :trace]) then :cyan
             when *options.fetch(:green, [:info, :success, :create]) then :green
             when *options.fetch(:yellow, [:warn, :update]) then :yellow
-            when *options.fetch(:red, [:error, :fail, :delete]) then :red
+            when *options.fetch(:red, [:error, :fail, :delete, :replace]) then :red
             else options.fetch(:default, :green)
             end
           end

lib/convection/model/template.rb

@@ -184,7 +184,12 @@ def diff(other = {})
       def properties(memo = {}, path = '')
         keys.each do |key|
           if self[key].is_a?(Hash) || self[key].is_a?(Array)
-            self[key].properties(memo, "#{path}.#{key}")
+            new_path = "#{path}#{path.empty? ? '' : '.'}#{key}"
+            resource_type = self["Type"]
+            if resource_type
+              new_path = "#{new_path}.#{resource_type}"
+            end
+            self[key].properties(memo, "#{new_path}")
           else
             memo["#{path}.#{key}"] = self[key]
           end