use more I18n and do not repeat ourselves while doing config checks

lib/vagrant-hostmanager/config.rb

@@ -15,29 +15,45 @@ module VagrantPlugins
 
       def finalize!
         @ignore_private_ip = false if @ignore_private_ip == UNSET_VALUE
+        @aliases = [ @aliases ].flatten
       end
 
       def validate(machine)
         errors = Array.new
 
         # check if enabled option is either true or false
-        if ![TrueClass, FalseClass].include?(enabled.class)
-          errors << "A value for hostmanager.enabled can be true or false."
-        end
+        errors << validate_bool('hostmanager.enabled', enabled)
 
-        # check if ignore_private_ip option is either true or false
-        if ![TrueClass, FalseClass].include?(ignore_private_ip.class) &&
-          @ignore_private_ip != UNSET_VALUE
-          errors << "A value for hostmanager.ignore_private_ip can be true or false."
+        # check if ignore_private_ip option is either true or false (or UNSET_VALUE)
+        if @ignore_private_ip != UNSET_VALUE
+          errors << validate_bool('hostmanager.ignore_private_ip', ignore_private_ip)
         end
 
         # check if aliases option is an Array
-        if !machine.config.hostmanager.aliases.kind_of?(Array)
-          errors << "A value for hostmanager.aliases must be an Array."
+        if  !machine.config.hostmanager.aliases.kind_of?(Array) and
+            !machine.config.hostmanager.aliases.kind_of?(String)
+          errors << I18n.t('vagrant_hostmanager.config.not_an_array_or_string', {
+            :config_key => 'hostmanager.aliases',
+            :is_class   => aliases.class.to_s,
+          })
         end
 
+        errors.compact!
         { "HostManager configuration" => errors }
       end
+
+      private
+      def validate_bool(key, value)
+        if ![TrueClass, FalseClass].include?(value.class)
+          I18n.t('vagrant_hostmanager.config.not_a_bool', {
+            :config_key => key,
+            :value      => value.class.to_s,
+          })
+        else
+          nil
+        end
+      end
+
     end
   end
 end

lib/vagrant-hostmanager/hosts_file.rb

@@ -32,7 +32,11 @@ module VagrantPlugins
               host = machine.config.vm.hostname || name
               ip = get_ip_address.call(machine)
               host_aliases = machine.config.hostmanager.aliases.join("\s").chomp
-              machine.env.ui.info "Adding /etc/hosts entry: #{ip} #{host} #{host_aliases}"
+              machine.env.ui.info I18n.t('vagrant_hostmanager.action.add_host', {
+                :ip       => ip,
+                :host     => host,
+                :aliases  => host_aliases,
+              })
               file << "#{ip}\t#{host}\s#{host_aliases}\n"
             end
           end

locales/en.yml

@@ -1,4 +1,8 @@
 en:
   vagrant_hostmanager:
     action:
+      add_host: "Adding /etc/hosts entry: %{ip} %{host} %{aliases}"
       update: "[%{name}] Updating /etc/hosts file"
+    config:
+      not_a_bool: "A value for %{config_key} can only be true or false, not type '%{value}'"
+      not_an_array_or_string: "A value for %{config_key} must be an Array or String, not type '%{is_class}'"