[bug][finch] Infrastructure classes are output to /scala folder

[jimschubert]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Types are written to the scala folder rather than a standard package folder structure (as defined by packageName).

For example, defining:

• packageName=org.openapitools.finchy
• apiPackage=org.openapitools.finchy.apis
• modelPackage=org.openapitools.finchy.models

openapi-generator version

4.0.0, possibly affects earlier versions

OpenAPI declaration file content or url

https://github.com/OAI/OpenAPI-Specification/blob/master/examples/v2.0/json/api-with-examples.json

Command line used for generation

OPENAPI_GENERATOR_VERSION=4.0.0 openapi-generator generate \
  -g scala-finch \
  -i https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v2.0/json/api-with-examples.json \
  -o finchy \
  --additional-properties=packageName=org.openapitools.finchy,apiPackage=org.openapitools.finchy.apis,modelPackage=org.openapitools.finchy.models

where openapi-generator is our launcher script (https://github.com/OpenAPITools/openapi-generator/blob/master/bin/utils/openapi-generator-cli.sh)

Steps to reproduce

Generate using command above, inspect output:

[main] WARN  o.o.c.ignore.CodegenIgnoreProcessor - Output directory does not exist, or is inaccessible. No file (.openapi-generator-ignore) will be evaluated.
[main] INFO  o.o.codegen.DefaultGenerator - OpenAPI Generator: scala-finch (server)
[main] INFO  o.o.codegen.DefaultGenerator - Generator 'scala-finch' is considered stable.
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/src/main/scala/org/openapitools/finchy/apis/DefaultApi.scala
[main] WARN  o.o.codegen.utils.URLPathUtils - 'host' (OAS 2.0) or 'servers' (OAS 3.0) not defined in the spec. Default to [http://localhost] for server URL [http://localhost/]
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/README.md
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/build.sbt
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/src/main/scala/Server.scala
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/src/main/scala/DataAccessor.scala
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/project/build.properties
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/project/plugins.sbt
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/sbt
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/src/main/scala/endpoint.scala
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/src/main/scala/errors.scala
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/.openapi-generator-ignore
[main] INFO  o.o.codegen.AbstractGenerator - writing file /Users/jim/projects/openapi-generator/.bak/finchy/.openapi-generator/VERSION

Suggest a fix

Set the target folder for infrastructural types to the package output path.

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