Andy Gayton 92831d7efc
feat: add an echo command to nu_plugin_example (#12754)
# Description

This PR adds a new `echo` command to the `nu_plugin_example` plugin that
simply [streams all of its input to its
output](https://github.com/nushell/nushell/pull/12754/files#diff-de9fcf086b8c373039dadcc2bcb664c6014c0b2af8568eab68c0b6666ac5ccceR47).

```
: "hi" | example echo
hi
```

The motivation for adding it is to have a convenient command to exercise
interactivity on slow pipelines.

I'll follow up on that front with [another
PR](https://github.com/cablehead/nushell/pull/1/files)

# Tests + Formatting

https://github.com/nushell/nushell/pull/12754/files#diff-de9fcf086b8c373039dadcc2bcb664c6014c0b2af8568eab68c0b6666ac5ccceR51-R55
2024-05-08 12:45:44 -07:00
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Nushell core libraries and plugins

These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.

Foundational libraries are split into two kinds of crates:

  • Core crates - those crates that work together to build the Nushell language engine
  • Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.

Plugins are likewise also split into two types:

  • Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
  • Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.