Formatting of Generated Code is Ugly

[Matthew Mitchell]

Describe the bug

When generating code using 2.0.0-dev.28, the output of rust_ffi.g.dart is ugly with weird indentation. A example snippet:

@freezed
                 class CustomError with _$CustomError implements FrbException {
                     const factory CustomError.error0(  String field0,) = CustomError_Error0;
 const factory CustomError.error1(  int field0,) = CustomError_Error1;
                }

Steps to reproduce

Use flutter_rust_bridge_codegen = "=2.0.0-dev.28" as a build dependency and generate for the following code:

pub enum CustomError {
    Error0(String),
    Error1(u32),
}

pub fn return_err_custom_error() -> Result<u32, CustomError> {
    Err(CustomError::Error1(3))
}

I generated using build.rs:

use lib_flutter_rust_bridge_codegen::codegen;
use lib_flutter_rust_bridge_codegen::codegen::Config;
use anyhow;

fn main() -> anyhow::Result<()> {
  // Tell Cargo that if the input Rust code changes, rerun this build script
  println!("cargo:rerun-if-changed=src/api");

  codegen::generate(
    Config::from_config_file("./flutter_rust_bridge.yaml")?.unwrap(),
    Default::default(),
  )

}

Configuration is uncomplicated:

rust_input: src/api/**/*.rs
dart_output: ../libtest/lib/src/rust_bindings/
local: true

Logs

Cannot do right now sorry. Probably doesn't matter.

Expected behavior

No response

Generated binding code

No response

OS

Linux Debian 12

Version of flutter_rust_bridge_codegen

2.0.0-dev.28

Flutter info

No response

Version of clang++

No response

Additional context

No response

[fzyzcjy]

Hi, could you please paste the full codegen logs? (I suspect there may be some warnings) In addition, if you use command line instead of build.rs, does this problem still occurs?

[Matthew Mitchell]

I ran with cargo build and when I generated into an empty directory, there are no warnings and curiously no rust_ffi.g.dart generated. The generated files are OK:

        ▾ api/
            main.dart
            main.freezed.dart
          frb_generated.dart
          frb_generated.io.dart
          frb_generated.web.dart

I tried generating into the previous v1 directory again and rust_ffi.g.dart wasn't changed this time, so I don't know how that got corrupted previously. I suppose it's prudent to ask people to remove all v1 generated files before running v2.

[Matthew Mitchell]

No issue using flutter_rust_bridge_codegen generate either, so not sure what happened before.

[fzyzcjy]

I suppose it's prudent to ask people to remove all v1 generated files before running v2.

Looks reasonable! Feel free to PR to modify https://cjycode.com/flutter_rust_bridge/guides/miscellaneous/upgrade/v2