clerr

This library aids in command-line error reporting.

clerr = "0.10.0"

Examples

Simple Report

use clerr::*;

let code: Code = Code::error("E001", "file not found");
let report: Report = Report::from(code);
eprintln!("{}", report);

error[E001]: file not found

Token Info

Highlight a specific token in a source line with a message, similar to rustc output.

use clerr::*;

let code: Code = Code::warning("W012", "unused variable");
let info: TokenInfo = TokenInfo {
    severity: Severity::Warning,
    file_name: "src/main.rs",
    line: 8,
    position: 8,
    line_text: "    let x = 42;",
    token_len: 1,
    message: "consider prefixing with `_`",
};
let report: Report = Report::from(code).with_entry(info);
eprintln!("{}", report);

warning[W012]: unused variable
 --> src/main.rs [line=8, position=9]
  |
8 |     let x = 42;
  |         ^ --- consider prefixing with `_`
  |

Properties

Display aligned key-value pairs under a report.

use clerr::*;

let props: Properties = Properties::default()
    .with_property("file", "/etc/config.yml")
    .with_property("expected", "utf-8")
    .with_property("found", "binary");
let code: Code = Code::error("E042", "invalid encoding");
let report: Report = Report::from(code).with_entry(props);
eprintln!("{}", report);

error[E042]: invalid encoding
    file:      /etc/config.yml
    expected:  utf-8
    found:     binary

Severity Levels

Three severity levels are available, each with a distinct color:

These colors are intentionally fixed for consistency.

Issues & Contributing

See ISSUES.md for future work and CONTRIBUTING.md for guidelines.