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use crate::error::Error;
// Merge a list of errors into a single one.
pub fn merge_errors(errors: &[Error]) -> Error {
Error {
message: errors
.iter()
.fold(String::new(), |acc, error| {
format!(
"{}\n{}{}",
acc,
// Only render an empty line between errors here if the previous line doesn't
// already visually look like an empty line. See [ref:overline_u203e].
if acc
.split('\n')
.next_back()
.unwrap() // Safe since `split` always results in at least one item
.chars()
.all(|c| c == ' ' || c == '\u{203e}')
{
""
} else {
"\n"
},
error,
)
})
.trim()
.to_owned(),
reason: None,
}
}
#[cfg(test)]
mod tests {
use crate::{error::Error, error_merger::merge_errors};
#[test]
fn merge_errors_empty() {
assert_eq!(format!("{}", merge_errors(&[])), "");
}
#[test]
fn merge_errors_single() {
assert_eq!(
format!(
"{}",
merge_errors(&[Error {
message: "Something went wrong.".to_owned(),
reason: None,
}]),
),
"Something went wrong.",
);
}
#[test]
fn merge_errors_double() {
assert_eq!(
format!(
"{}",
merge_errors(&[
Error {
message: "Something went kinda wrong.".to_owned(),
reason: None,
},
Error {
message: "Something went sorta wrong.".to_owned(),
reason: None,
},
Error {
message: "Something went very wrong.".to_owned(),
reason: None,
},
]),
),
"\
Something went kinda wrong.
Something went sorta wrong.
Something went very wrong.\
",
);
}
#[test]
fn merge_errors_visually_empty_line() {
assert_eq!(
format!(
"{}",
merge_errors(&[
Error {
message: "1 \u{2502} foo\n \u{250a} \u{203e}\u{203e}\u{203e}\n2 \u{2502} \
bar\n \u{250a} \u{203e}\u{203e}\u{203e}\n3 \u{2502} baz\n \
\u{250a} \u{203e}\u{203e}\u{203e}\n4 \u{2502} qux\n \u{203e}\
\u{203e}\u{203e}"
.to_owned(),
reason: None,
},
Error {
message: "Something went sorta wrong.".to_owned(),
reason: None,
},
]),
),
"\
1 \u{2502} foo\n \u{250a} \u{203e}\u{203e}\u{203e}\n2 \u{2502} \
bar\n \u{250a} \u{203e}\u{203e}\u{203e}\n3 \u{2502} baz\n \
\u{250a} \u{203e}\u{203e}\u{203e}\n4 \u{2502} qux\n \u{203e}\
\u{203e}\u{203e}
Something went sorta wrong.\
",
);
}
}