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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015-2020 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use std::process::exit;
use anyhow::Error;
use ansi_term::Colour::Red;
pub fn trace_error(e: &Error) {
eprintln!("{}: {}", Red.blink().paint("ERROR[ 0]"), e);
let mut i = 0;
e.chain().skip(1).for_each(|cause| {
eprintln!("{prefix}: {error}",
prefix = Red.blink().paint(format!("ERROR[{:>4}]", i + 1)),
error = cause);
i += 1;
});
}
pub fn trace_error_dbg(e: &Error) {
debug!("{}: {}", Red.blink().paint("ERROR[ 0]"), e);
let mut i = 0;
e.chain().skip(1).for_each(|cause| {
debug!("{prefix}: {error}",
prefix = Red.blink().paint(format!("ERROR[{:>4}]", i + 1)),
error = cause);
i += 1;
});
}
/// Helper functions for `Result<T, E>` types to reduce overhead in the following situations:
///
/// ```ignore
/// function().map_err(|e| { trace_error(&e); e })
/// ```
///
/// and variants
pub trait MapErrTrace {
type Output;
fn map_err_trace(self) -> Self;
fn map_err_trace_exit_unwrap(self) -> Self::Output;
}
impl<U> MapErrTrace for Result<U, Error> {
type Output = U;
/// Simply call `trace_error()` on the Err (if there is one) and return the error.
///
/// This does nothing besides the side effect of printing the error trace
fn map_err_trace(self) -> Self {
self.map_err(|e| { trace_error(&e); e })
}
/// Trace the error and exit or unwrap the Ok(_).
fn map_err_trace_exit_unwrap(self) -> Self::Output {
self.map_err(|e| { trace_error(&e); exit(1) }).unwrap()
}
}
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