Generated Kotlin code adds unnecessary underscore

[simonsickle]

Context

I have a simple proto file that is essentially representing a map with a name and value field.

message TestMap {
  optional string name = 2;
  optional string value = 3;
}

I expect the generated Kotlin code to look something like

Actual

The generated Kotlin code is generated with an underscore appended to the end of the value property name.

public class TestMap(
  @field:WireField(
    tag = 2,
    adapter = "com.squareup.wire.ProtoAdapter#STRING",
    schemaIndex = 0,
  )
  public val name: String? = null,
  @field:WireField(
    tag = 3,
    adapter = "com.squareup.wire.ProtoAdapter#STRING",
    declaredName = "value",
    schemaIndex = 1,
  )
  public val value_: String? = null,
  unknownFields: ByteString = ByteString.EMPTY,
) : Message<TestMap, Nothing>(ADAPTER, unknownFields)

Expected

I expect value to not contain an underscore since it is not a keyword as a property name.

public class TestMap(
  @field:WireField(
    tag = 2,
    adapter = "com.squareup.wire.ProtoAdapter#STRING",
    schemaIndex = 0,
  )
  public val name: String? = null,
  @field:WireField(
    tag = 3,
    adapter = "com.squareup.wire.ProtoAdapter#STRING",
    declaredName = "value",
    schemaIndex = 1,
  )
  public val value: String? = null,
  unknownFields: ByteString = ByteString.EMPTY,
) : Message<TestMap, Nothing>(ADAPTER, unknownFields)

[oldergod]

The _ is adding by KotlinPoet which does so because value can be a keyword depending on its usage.
If you want backtick instead, you can use escapeKotlinKeywords = true in the kotlin {} block like so

wire {
  kotlin {
    escapeKotlinKeywords = true
  }
}

[simonsickle]

Since it isn't a keyword in this scenario, escaping doesn't seem like the correct behavior to me (and the conventions plugin here won't let me configure wire as far as I can tell, no one internally seems to be using escapeKotlinKeywords).

That said, this issue is in the KotlinPoet project, not Wire.

[simonsickle]

Further context for the next person, square/kotlinpoet#994

This seems to be expected behavior to avoid having to write all of the compiler rules into KotlinPoet