Fixes #288

src/main/scala/higherkindness/skeuomorph/mu/codegen.scala

@@ -23,6 +23,7 @@ import higherkindness.droste._
 import higherkindness.skeuomorph.mu.MuF._
 import higherkindness.skeuomorph.mu.Optimize._
 import higherkindness.skeuomorph.{protobuf => pb}
+import higherkindness.skeuomorph.Printer.toValidIdentifier
 import scala.reflect.ClassTag
 import cats.syntax.either._
 import cats.syntax.traverse._
@@ -47,6 +48,7 @@ object codegen {
   )(implicit T: Basis[MuF, T]): Either[String, Pkg] = {
 
     val packageName = protocol.pkg
+      .map(_.split('.').toList.map(toValidIdentifier).mkString("."))
       .getOrElse("proto")
       .parse[Term]
       .toEither

src/test/scala/higherkindness/skeuomorph/protobuf/ProtobufProtocolSpec.scala

@@ -52,6 +52,8 @@ class ProtobufProtocolSpec extends Specification with ScalaCheck {
   It should generate correct Scala code for a subset of the opencensus Protobuf protocol's models. $codegenOpencensus
 
   The generated Scala code should include appropriately tagged integer types. $codegenTaggedIntegers
+
+  The generated Scala code should escape 'type' keyword in package (directory) names. $codegenGoogleApi
   """
 
   def codegenProtobufProtocol =
@@ -368,4 +370,21 @@ class ProtobufProtocolSpec extends Specification with ScalaCheck {
     |  )
     |}
     |""".stripMargin
+
+  def codegenGoogleApi = {
+    val googleApiProtocol: Protocol[Mu[ProtobufF]] = {
+      val path   = workingDirectory + s"$testDirectory/models/type"
+      val source = ProtoSource(s"date.proto", path, importRoot)
+      parseProto[IO, Mu[ProtobufF]].parse(source).unsafeRunSync()
+    }
+
+    check(googleApiProtocol, googleApiExpectation)
+  }
+
+  val googleApiExpectation = s"""
+    |package google.`type`
+    |import _root_.higherkindness.mu.rpc.protocol._
+    |object date { final case class Date(@_root_.pbdirect.pbIndex(1) year: _root_.scala.Int, @_root_.pbdirect.pbIndex(2) month: _root_.scala.Int, @_root_.pbdirect.pbIndex(3) day: _root_.scala.Int) }
+    |""".stripMargin
+
 }

src/test/scala/higherkindness/skeuomorph/protobuf/models/type/date.proto

@@ -0,0 +1,50 @@
+// Copyright 2019 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+syntax = "proto3";
+
+package google.type;
+
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/genproto/googleapis/type/date;date";
+option java_multiple_files = true;
+option java_outer_classname = "DateProto";
+option java_package = "com.google.type";
+option objc_class_prefix = "GTP";
+
+// Represents a whole or partial calendar date, e.g. a birthday. The time of day
+// and time zone are either specified elsewhere or are not significant. The date
+// is relative to the Proleptic Gregorian Calendar. This can represent:
+//
+// * A full date, with non-zero year, month and day values
+// * A month and day value, with a zero year, e.g. an anniversary
+// * A year on its own, with zero month and day values
+// * A year and month value, with a zero day, e.g. a credit card expiration date
+//
+// Related types are [google.type.TimeOfDay][google.type.TimeOfDay] and `google.protobuf.Timestamp`.
+message Date {
+  // Year of date. Must be from 1 to 9999, or 0 if specifying a date without
+  // a year.
+  int32 year = 1;
+
+  // Month of year. Must be from 1 to 12, or 0 if specifying a year without a
+  // month and day.
+  int32 month = 2;
+
+  // Day of month. Must be from 1 to 31 and valid for the year and month, or 0
+  // if specifying a year by itself or a year and month where the day is not
+  // significant.
+  int32 day = 3;
+}