feat: Support for marking "RUST-ATTRIBUTE" (type attribute)

[H2Sxxa]

Changes

Support pass extra args to protoc.

Why

Sometimes, there is a need to add derives (#401) , if we use protoc to generate, we can pass some optional arguments,
like --prost_opt=type_attribute=Helloworld=#[derive(Foo)], but in rinf, we can't do the same.

This PR allows you to pass extra args to protoc and you can configure the extra args in pubspec.yaml.

Usage

1. Configure in pubspec.yaml.

rinf:
  message:
    extra_args: 
      - --prost_opt=type_attribute=SampleFractal=#[derive(Foo)]

2. Run rinf message

fractal_art.rs

// @generated
/// \[RINF:RUST-SIGNAL-BINARY\]
/// You can add your custom comments like this.
/// Protobuf's import statement also works well.
+ #[derive(Foo)]
#[allow(clippy::derive_partial_eq_without_eq)]
#[derive(Clone, PartialEq, ::prost::Message)]
pub struct SampleFractal {
...

FYI, https://github.com/neoeinstein/protoc-gen-prost/tree/main/protoc-gen-prost#options

Before Committing

dart analyze flutter_ffi_plugin --fatal-infos
dart format .
cargo fmt
cargo clippy --fix --allow-dirty

[temeddix]

Great PR :)

I have one request. Rather than passing raw extra_args, could you make the config format include rust_derive field as written below?

rinf:
  message:
    rust_derive: 
      SampleFractal: "Default"
      NumberInput:
        - "Default"
        - "extern_crate::ExternTrait"

[H2Sxxa]

Great PR :)

I have one request. Rather than passing raw extra_args, could you make the config format include rust_derive field as written below?

rinf:
  message:
    rust_derive: 
      SampleFractal: "Default"
      NumberInput:
        - "Default"
        - "extern_crate::ExternTrait"

I agree, the request is reasonable.

But the type_attribute not only includes derives, there are some stuff like #[serde(rename_all = "snake_case")] .

How about keeping both options at the same time?

rinf:
  message:
    rust_derive: 
      SampleFractal: "Default"
      NumberInput:
        - "Default"
        - "extern_crate::ExternTrait"
    type_attribute:
      SampleFractal: "#[derive(Trait)]"
      NumberInput:
        - "#[serde(rename_all = \"snake_case\")]"
        - ...

[temeddix]

There's actually another option, which is the most ideal way in my opinion.

It's allowing to write something like:

// [RINF:DART-SIGNAL]
// [RINF:RUST-ATTRIBUTE(#[serde(rename_all = "camelCase")])]
message MyMessage {}

What do you think? Do you mind orienting your PR this way?

[H2Sxxa]

There's actually another option, which is the most ideal way in my opinion.

It's allowing to write something like:

// [RINF:DART-SIGNAL]
// [RINF:RUST-ATTRIBUTE(#[serde(rename_all = "camelCase")])]
message MyMessage {}

What do you think? Do you mind orienting your PR this way?

That's great.

[H2Sxxa]

I tried to implement it using a method that was less logically disruptive to the code.

If you want to implement it yourself, just feel free to close the PR or refactor it :)

[temeddix]

Looks good overall :D I will add documentations and refine some of the code later. Thank you for your effort and patience.