Scalabuff removes _ chars in vaiable names and error occur when scala is compiled

[lewissk]

If your protobuf looks like this (test project is located here https://github.com/lewissk/test_protobuf/tree/master):

syntax = "proto2";
package test;

option java_package = "test";
option cc_enable_arenas = true;

enum ContentCategory {
  IAB1_1 = 2;
  IAB11 = 191;
}

Then you run:

sbt compile

You will get the following error:

[error] /Users/xxx/test/protobuf_scala_test/target/src_managed/main/compiled_protobuf/test/ContentCategory.scala:11: method isIab11 is defined twice
[error]   conflicting symbols both originated in file '/Users/xxx/protobuf_scala_test/target/src_managed/main/compiled_protobuf/test/ContentCategory.scala'
[error]   def isIab11: Boolean = false
[error]       ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed

Because the scala it generates is like so:

// Generated by the Scala Plugin for the Protocol Buffer Compiler.
// Do not edit!

package test


import com.trueaccord.scalapb.Descriptors

sealed trait ContentCategory extends com.trueaccord.scalapb.GeneratedEnum {
  def isIab11: Boolean = false
  def isIab11: Boolean = false
}

object ContentCategory extends com.trueaccord.scalapb.GeneratedEnumCompanion[ContentCategory] {
  @SerialVersionUID(0L)
  case object IAB1_1 extends ContentCategory {
    val id = 2
    val name = "IAB1_1"
    override def isIab11: Boolean = true
  }

  @SerialVersionUID(0L)
  case object IAB11 extends ContentCategory {
    val id = 191
    val name = "IAB11"
    override def isIab11: Boolean = true
  }

  lazy val values = Seq(IAB1_1, IAB11)
  def fromValue(value: Int): ContentCategory = value match {
    case 2 => IAB1_1
    case 191 => IAB11
  }
  lazy val descriptor = new Descriptors.EnumDescriptor(0, "ContentCategory", this)
}