nu-source

Overview

The nu-source crate contains types and traits used for keeping track of metadata about values being processed. Nu uses Tags to keep track of where a value came from, an AnchorLocation, as well as positional information about the value, a Span. An AnchorLocation can be a Url, File, or Source text that a value was parsed from. The source Text is special in that it is a type similar to a String that comes with the ability to be cheaply cloned. A Span keeps track of a value's start and end positions. These types make up the metadata for a value and are wrapped up together in a Tagged struct, which holds everything needed to track and locate a value.

Nu's metadata system can be seen when reporting errors. In the following example Nu is able to report to the user where the typo of a column originated from.

1 | ls | get typ
  |          ^^^ did you mean 'type'?

In addition to metadata tracking, nu-source also contains types and traits related to debugging, tracing, and formatting the metadata and values it processes.

Other Resources

• Nushell Github Project: Contains all projects in the Nushell ecosystem such as the source code to Nushell as well as website and books.
• Nushell Git Repository: A direct link to the source git repository for Nushell
• Nushell Contributor Book: An overview of topics about Nushell to help you get started contributing to the project.
• Discord Channel
• Twitter