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refactor(cli): Pull out error chain iteration (#15926)

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### What does this PR try to resolve?

This is some cleanup that will help with #15922

### How to test and review this PR?
This commit is contained in:
Eric Huss 2025-09-04 15:36:24 +00:00 committed by GitHub
commit a154b100bc
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1 changed files with 16 additions and 13 deletions
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29
src/cargo/lib.rs
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@ -140,6 +140,7 @@
//! [Cargo Contributor Guide]: https://doc.crates.io/contrib/
use crate::core::Shell;
use crate::core::shell::Verbosity;
use crate::core::shell::Verbosity::Verbose;
use anyhow::Error;
use tracing::debug;
@ -206,18 +207,21 @@ pub fn display_warning_with_error(warning: &str, err: &Error, shell: &mut Shell)
_display_error(err, shell, false);
}
fn _display_error(err: &Error, shell: &mut Shell, as_err: bool) -> bool {
for (i, err) in err.chain().enumerate() {
// If we're not in verbose mode then only print cause chain until one
// marked as `VerboseError` appears.
//
// Generally the top error shouldn't be verbose, but check it anyways.
if shell.verbosity() != Verbose && err.is::<VerboseError>() {
return true;
}
if err.is::<AlreadyPrintedError>() {
break;
}
fn error_chain(err: &Error, verbosity: Verbosity) -> impl Iterator<Item = &dyn std::fmt::Display> {
err.chain()
.take_while(move |err| {
// If we're not in verbose mode then only print cause chain until one
// marked as `VerboseError` appears.
//
// Generally the top error shouldn't be verbose, but check it anyways.
verbosity == Verbose || !err.is::<VerboseError>()
})
.take_while(|err| !err.is::<AlreadyPrintedError>())
.map(|err| err as &dyn std::fmt::Display)
}
fn _display_error(err: &Error, shell: &mut Shell, as_err: bool) {
for (i, err) in error_chain(err, shell.verbosity()).enumerate() {
if i == 0 {
if as_err {
drop(shell.error(&err));
@ -229,5 +233,4 @@ fn _display_error(err: &Error, shell: &mut Shell, as_err: bool) -> bool {
drop(write!(shell.err(), "{}", indented_lines(&err.to_string())));
}
}
false
}