vendor/env_logger/src/fmt/writer/termcolor/shim_impl.rs

   1 use std::{io, sync::Mutex};
   2
   3 use crate::fmt::{WritableTarget, WriteStyle};
   4
   5 pub(in crate::fmt::writer) mod glob {}
   6
   7 pub(in crate::fmt::writer) struct BufferWriter {
   8     target: WritableTarget,
   9 }
  10
  11 pub(in crate::fmt) struct Buffer(Vec<u8>);
  12
  13 impl BufferWriter {
  14     pub(in crate::fmt::writer) fn stderr(_is_test: bool, _write_style: WriteStyle) -> Self {
  15         BufferWriter {
  16             target: WritableTarget::Stderr,
  17         }
  18     }
  19
  20     pub(in crate::fmt::writer) fn stdout(_is_test: bool, _write_style: WriteStyle) -> Self {
  21         BufferWriter {
  22             target: WritableTarget::Stdout,
  23         }
  24     }
  25
  26     pub(in crate::fmt::writer) fn pipe(
  27         _write_style: WriteStyle,
  28         pipe: Box<Mutex<dyn io::Write + Send + 'static>>,
  29     ) -> Self {
  30         BufferWriter {
  31             target: WritableTarget::Pipe(pipe),
  32         }
  33     }
  34
  35     pub(in crate::fmt::writer) fn buffer(&self) -> Buffer {
  36         Buffer(Vec::new())
  37     }
  38
  39     pub(in crate::fmt::writer) fn print(&self, buf: &Buffer) -> io::Result<()> {
  40         // This impl uses the `eprint` and `print` macros
  41         // instead of using the streams directly.
  42         // This is so their output can be captured by `cargo test`.
  43         match &self.target {
  44             // Safety: If the target type is `Pipe`, `target_pipe` will always be non-empty.
  45             WritableTarget::Pipe(pipe) => pipe.lock().unwrap().write_all(&buf.0)?,
  46             WritableTarget::Stdout => print!("{}", String::from_utf8_lossy(&buf.0)),
  47             WritableTarget::Stderr => eprint!("{}", String::from_utf8_lossy(&buf.0)),
  48         }
  49
  50         Ok(())
  51     }
  52 }
  53
  54 impl Buffer {
  55     pub(in crate::fmt) fn clear(&mut self) {
  56         self.0.clear();
  57     }
  58
  59     pub(in crate::fmt) fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
  60         self.0.extend(buf);
  61         Ok(buf.len())
  62     }
  63
  64     pub(in crate::fmt) fn flush(&mut self) -> io::Result<()> {
  65         Ok(())
  66     }
  67
  68     #[cfg(test)]
  69     pub(in crate::fmt) fn bytes(&self) -> &[u8] {
  70         &self.0
  71     }
  72 }