https://github.com/1computer1/errata

Source code error pretty printing
https://github.com/1computer1/errata

error error-messages haskell highlight pretty-printing source-code

Last synced: 6 months ago
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Source code error pretty printing

• Host: GitHub
• URL: https://github.com/1computer1/errata
• Owner: 1Computer1
• License: mit
• Created: 2020-08-27T19:34:47.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2024-12-10T04:28:55.000Z (10 months ago)
• Last Synced: 2025-03-30T08:07:45.726Z (6 months ago)
• Topics: error, error-messages, haskell, highlight, pretty-printing, source-code
• Language: Haskell
• Homepage:
• Size: 142 KB
• Stars: 48
• Watchers: 3
• Forks: 6
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

          
# Errata

[![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE)

[![Hackage](https://img.shields.io/hackage/v/errata.svg?logo=haskell)](https://hackage.haskell.org/package/errata)

[![CI](https://github.com/1Computer1/errata/workflows/CI/badge.svg)](https://github.com/1Computer1/errata/actions?query=workflow%3ACI)

**Errata** is an extremely customizable error pretty printer that can handle many kinds of error formatting.

## Features

**Errata** can handle errors that are all over the source or errors that are connected to each other spanning multiple lines. You can be as simple or as fancy as you like!  

You can also customize the format of the printer in several ways:  

- Custom messages and labels

- Custom character sets for symbols

- Highlighting the source, messages, and symbols

## Examples

A clean, modern error message that is trying to be helpful:

![An error message that points out that the `fold` function was not found in scope. It then asks if the user meant to use `foldl` or `foldr`](./errata_fold.png)

A busy error message with underlining and connections:

![An error message that highlights mismatching types in an `if` expression. The first section underlines the mismatching values, and the second section underlines the `if` expression](./errata_if.png)