Add as_str and godot_name to non-bitfield enums

[SomeRanDev]

As far as I can tell, you can only get the name of an enumeration from Debug, and it's impossible to get the Godot name. This is possible in GDScript, and would be a nice feature to have (in my case I'd like to load keyboard prompts icons based on the Key enum name).

This PR extracts the match statement generated for Debug into as_str so you can get the names with less overhead. And it also adds godot_name which returns the GDScript version of the name if desired.

[GodotRust]

API docs are being generated and will be shortly available at: https://godot-rust.github.io/docs/gdext/pr-898

[SomeRanDev]

Sorry about that, was having trouble using clippy on my end, but this should pass now.

[Bromeon]

No worries, and thank you for your contribution 😊

Could you add a short integration test in enum_test.rs? You can use some existing enums that are already generated in the minimal codegen.

If you find a case where Rust/Godot have same enumerator names, even better 🙂

[Bromeon]

Suggested change

	// Only enumerations with different godot names are specified.
	// `as_str` is called for the rest of them.
	let godot_name_enumerators = {
	// Only enumerations with different Godot names are specified.
	// `as_str` is called for the rest of them.
	let godot_different_cases = {

Reason for name is that

• you're specifying match arms (cases), not enumerators
• highlight that only different names are listed

[Bromeon]

General question, does this happen a lot? Most Godot enumerators are prefixed with their enum type, while Rust ones aren't 🤔

[SomeRanDev]

In terms of differences outside of just the prefix, as far as I know there aren't any. I thought it would be a nice feature to have, but in retrospect maybe it would be better to have a function that just returns the Godot prefix instead? 😅

[Bromeon]

It's not as simple as "Rust ident == Godot prefix + enumerator name", the algorithm to map is quite complex and needs to handle some special cases. As such, a prefix would not be useful.

I checked quickly:

• 4724 enumerators total in the API
• 4565 (96.6%) of which differ between Godot and Rust
• 159 (3.4%) of which remain the same between Godot and Rust

Despite the minority, I think it doesn't hurt much to reuse as_str() where possible. If it turns out to be negative in any way, we can always change the implementation.

[Bromeon]

Thanks a lot for your contribution!