67 lines
2.2 KiB
Rust
67 lines
2.2 KiB
Rust
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//
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// imag - the personal information management suite for the commandline
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// Copyright (C) 2015-2018 Matthias Beyer <mail@beyermatthias.de> and contributors
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; version
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// 2.1 of the License.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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//! Proxy objects for std::io::Stdin, std::io::Stdout, std::io::Stderr
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use std::fmt::Debug;
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use std::io::Write;
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/// Proxy object for output
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///
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/// This is returned by `Runtime::stdout()` does implement `Write`. So you can
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/// `write!(rt.stdout(), "some things")` and it just works.
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///
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/// The `Runtime` has to decide whether the OutputProxy should write to stdout, stderr or simply be
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/// a "sink" which does not write to either.
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///
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pub enum OutputProxy {
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Out,
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Err,
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Sink,
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}
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impl Write for OutputProxy {
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fn write(&mut self, buf: &[u8]) -> ::std::io::Result<usize> {
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match *self {
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OutputProxy::Out => ::std::io::stdout().write(buf),
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OutputProxy::Err => ::std::io::stderr().write(buf),
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OutputProxy::Sink => Ok(0),
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}
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}
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fn flush(&mut self) -> ::std::io::Result<()> {
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match *self {
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OutputProxy::Out => ::std::io::stdout().flush(),
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OutputProxy::Err => ::std::io::stderr().flush(),
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OutputProxy::Sink => Ok(()),
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}
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}
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}
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impl Debug for OutputProxy {
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fn fmt(&self, f: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> {
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match *self {
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OutputProxy::Out => write!(f, "OutputProxy(Stdout)"),
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OutputProxy::Err => write!(f, "OutputProxy(Stderr)"),
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OutputProxy::Sink => write!(f, "OutputProxy(Sink)"),
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}
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}
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}
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