utf8-command

lib.rs:

提供了Utf8Output类型，它是std::process::Output的UTF-8解码变体（由std::process::Command::output产生）。

通过TryInto或TryFrom特性从Output构造Utf8Output

let output: Utf8Output = Command::new("echo")
    .arg("puppy")
    .output()
    .unwrap()
    .try_into()
    .unwrap();
assert_eq!(
    output,
    Utf8Output {
        status: ExitStatus::default(),
        stdout: String::from("puppy\n"),
        stderr: String::from(""),
    },
);

错误信息将包括关于失败解码的流的详细信息，以及输出（无效的UTF-8字节用U+FFFD替换字符替换）

let invalid = Output {
    status: ExitStatus::default(),
    stdout: Vec::from(b"puppy doggy \xc3\x28"), // Invalid 2-byte sequence.
    stderr: Vec::from(b""),
};

let err: Result<Utf8Output, Error> = invalid.try_into();
assert_eq!(
    err.unwrap_err().to_string(),
    "Stdout contained invalid utf-8 sequence of 1 bytes from index 12: \"puppy doggy �(\""
);