Remove Ruby, Elixir, and C# generators

[leighmcculloch]

What

Delete the Ruby, Elixir, and C# generator implementations along with their spec output fixtures. Remove Ruby as the default CLI language, update the usage banner to use JavaScript as the example, and narrow the generator test suite to JavaScript and Go. Add a README note directing users to the git history for any deleted generators they may need.

Why

These generators are maintained externally and not maintained within the @stellar org. The project no longer accepts new built-in generators — users are directed to use xdrgen as a library with externally maintained generators. This keeps generators hosted in repos of maintainers, where maintainers can address bugs and security reports, and closer to the use cases that in this ecosystem are typically a Stellar XDR library or SDK. This continues the cleanup started with the prior removal of Python, Java, and Rust generators that happened in #226 (@overcart) and #221 (@leighmcculloch).

[Copilot]

Pull request overview

Removes the legacy Ruby, Elixir, and C# generator implementations (and their spec output fixtures), and updates the project docs/tests/CLI to reflect that only JavaScript and Go generators remain built in.

Changes:

• Delete Ruby/Elixir/C# generator implementations and their spec output fixtures.
• Narrow generator spec coverage to JavaScript and Go and remove the Ruby/Elixir/C# autoloads.
• Update CLI usage banner and README guidance to reflect generator removals.

Reviewed changes

Copilot reviewed 46 out of 46 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
spec/output/generator_spec_ruby/union.x/union_key.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/union.x/my_union.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/union.x/int_union.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/union.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/nester/nested_union.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/nester/nested_struct.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/nester/nested_enum.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/nester.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/my_struct.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/lots_of_my_structs.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/has_stuff.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/my_namespace/color.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/test.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/struct.x/my_struct.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/struct.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/optional.x/has_options.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/optional.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/nesting.x/union_key.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/nesting.x/my_union/two.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/nesting.x/my_union/one.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/nesting.x/my_union.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/nesting.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/enum.x/message_type.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/enum.x/color3.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/enum.x/color2.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/enum.x/color.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/enum.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/const.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/block_comments.x/account_flags.rb	Remove Ruby generator fixture output
spec/output/generator_spec_ruby/block_comments.x/MyXDR.rb	Remove Ruby generator fixture output
spec/output/generator_spec_elixir/union.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/test.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/struct.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/optional.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/nesting.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/enum.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/const.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/output/generator_spec_elixir/block_comments.x/MyXDR_generated.ex	Remove Elixir generator fixture output
spec/lib/xdrgen/generator_spec.rb	Restrict generator specs to JavaScript + Go
lib/xdrgen/generators/ruby.rb	Remove Ruby generator implementation
lib/xdrgen/generators/elixir.rb	Remove Elixir generator implementation
lib/xdrgen/generators/csharp.rb	Remove C# generator implementation
lib/xdrgen/generators.rb	Remove autoloads for deleted generators
lib/xdrgen/compilation.rb	Remove Ruby default language in Compilation initializer
lib/xdrgen/cli.rb	Update CLI usage banner / language option default behavior
README.md	Update documentation to reflect generator removals and new guidance

Comments suppressed due to low confidence (4)

lib/xdrgen/compilation.rb:9

• language now defaults to nil, but compile still falls back to Generators.for_language(@language) when no custom generator is provided. If both generator and language are nil, this currently fails with a confusing "Unsupported language: " error. Consider validating in initialize/compile that at least one of language or generator is provided and raising a clearer ArgumentError (or defaulting the CLI to a specific language).

    def initialize(source_paths, output_dir:".", language: nil, generator: nil, namespace: nil, options: {})
      raise "An empty list of source paths (.x files) provided. At least one source file must be provided to compile." if source_paths.empty?
      @source_paths = source_paths
      @output_dir  = output_dir
      @namespace   = namespace

README.md:23

• The NOTE says "Generators are no longer included in this repository", but this PR still keeps built-in generators (and later in the README you list javascript/golang). Consider rephrasing to reflect the new reality more precisely (e.g., legacy built-ins are limited to JavaScript and Go; other generators were removed/moved).

> [!NOTE]
> **Generators are no longer included in this repository.** If you're building a
> code generator, use xdrgen as a library (see below). Generators that were
> previously included (Python, Rust) have been slowly moved out to other
> repositories, usually close to the Stellar XDR libraries they generated. For
> any that were not moved but deleted (C#, Elixir, Ruby), they can be found in

README.md:79

• The CLI language values appear to be javascript and go (since Generators.for_language does const_get(language.to_s.classify) and the class is Go, not Golang). Listing golang here will lead users to an "Unsupported language" error; consider changing this to go or adding an explicit alias in the CLI/generator lookup.

`xdrgen [-o OUTPUT_DIR] [-l LANGUAGE] [-n NAMESPACE] [INPUT_FILES ...]`

The CLI still has the following built-in generators:

- javascript
- golang

README.md:8

• Ruby version support is inconsistent: line 7 states "requires ruby 3.1 to 3.3", but later in the binary usage section it says "compatible with ruby 2.1 or higher". These can’t both be true; please update/remove the older claim to match the actual supported Ruby versions (ideally align with xdrgen.gemspec’s required_ruby_version).

`xdrgen` requires ruby 3.1 to 3.3 to run.

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