qubit_command/
output_stream.rs

1/*******************************************************************************
2 *
3 *    Copyright (c) 2026 Haixing Hu.
4 *
5 *    SPDX-License-Identifier: Apache-2.0
6 *
7 *    Licensed under the Apache License, Version 2.0.
8 *
9 ******************************************************************************/
10use std::fmt;
11
12/// Output stream whose reader failed.
13///
14#[derive(Debug, Clone, Copy, PartialEq, Eq)]
15pub enum OutputStream {
16    /// Standard output stream.
17    Stdout,
18
19    /// Standard error stream.
20    Stderr,
21}
22
23impl OutputStream {
24    /// Returns a lowercase stream name for diagnostics.
25    ///
26    /// # Returns
27    ///
28    /// `"stdout"` for [`Self::Stdout`] and `"stderr"` for [`Self::Stderr`].
29    #[inline]
30    pub const fn as_str(self) -> &'static str {
31        match self {
32            Self::Stdout => "stdout",
33            Self::Stderr => "stderr",
34        }
35    }
36}
37
38impl fmt::Display for OutputStream {
39    /// Formats this stream name for diagnostics.
40    ///
41    /// # Parameters
42    ///
43    /// * `f` - Formatter receiving the lowercase stream name.
44    ///
45    /// # Returns
46    ///
47    /// [`fmt::Result`] from writing the stream name.
48    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
49        f.write_str(self.as_str())
50    }
51}
qubit_command/output_stream.rs

qubit_command/
output_stream.rs
