[BUG][Default][Java][Spring][Typescript-Angular][...?] Different behavior resolving Enum schema referred from sub directories between Linux and Windows generator

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)? impossible due $refs, but generator generates OK
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?

Description

Enum schemas are generated with additional Prefix which comes from subdirectory name, if object is referred from different files.

openapi-generator version

at lest 7.0.0 - up to master from 2024-03-04 23:00 CET

OpenAPI declaration file content or url

./api.yaml

openapi: 3.0.3
info:
  title: Example of issue with resolving enum names between Windows and Linux generation
  description: potato
  version: 1.0.0
paths:
  /hello-world:
    get:
      summary: whatever
      operationId: whateverGet
      responses:
        '200':
          description: ok
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ResponseModel'
components:
  schemas:
    ResponseModel:
      properties:
        someEnumField:
          $ref: './shared/shared.yaml#/components/schemas/SomeEnum'

./schemas/some-enum.yaml

type: string
enum:
  - one
  - two

./shared/shared.yaml

title: shared models between apis
components:
  schemas:
    SomeEnum:
      $ref: '../schemas/some-enum.yaml'

Generation Details

Issue looks global - happens on Spring Server stubs generation, Java Client, TypeScript Angular client... I've didn't tested other generators. This ticket only shows example from spring generator.

Also I've spent multiple hours to find similar issue or reason from generator codebase. My assumption and guess is that there's difference sanitizing symbol name because of different path separator in OSes.

Generator output (command below). Left Windows 10, right Debian

File difference

Yaml file regenerated from source (src/resources/openapi.yaml)

Log differences (nothing important here imho)

Issue also appears using maven plugin.

Steps to reproduce

1. Recreate those three yaml files like in section above
2. Run on Windows (command from git-bash, doesn't matter):

➜  ./jdk-21.0.2/bin/java -jar /Tools/openapi/openapi-generator-cli-7.3.0.jar generate -i api.yaml -g spring

Related issues/PRs

Didn't found.

Suggest a fix

Align behavior in Windows to Linux output.

Recreate api.yaml, shared/shared.yaml, and schemas/some-enum.yaml, then run the documented spring generator command on Windows and Linux. Compare the generated enum names and trace the $ref resolution and path-separator handling; the work is done when both systems produce matching output.