Macro arr

macro_rules! arr {
    () => { ... };
    ($($item:expr),+ $(,)?) => { ... };
}

Creates a fixed-size array literal with each element converted with Into.

You’ll probably need a hint for the target type of items in the array if the compiler can’t infer it from its usage.

This is similar in spirit to the bon::vec! macro, but it’s for arrays. See bon::vec! docs for details.

Same example as in bon::vec!, but using this macro. It works with array as well because Command::args accepts any value that implements IntoIterator:

fn convert_media(input_extension: &str, output_extension: &str) -> std::io::Result<()> {
    let ffmpeg_args: [String; 4] = bon::arr![
        "-i",
        format!("input.{input_extension}"),
        "-y",
        format!("output.{output_extension}"),
    ];

    std::process::Command::new("ffmpeg").args(ffmpeg_args).output()?;

    Ok(())
}

This macro doesn’t support [expr; N] syntax, since it’s simpler to just write [expr.into(); N] instead.