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Leonhard Kipp 71b99edd48
parser/add rest args to def (#2961) 
* Add rest arg to def

This commit applied adds the ability to define the rest parameter of a def
command. It does not implement the functionality to expand the rest argument in
a user defined def function.

The rest argument has to be exactly worded "...rest".

Example after this PR is applied:

file test.nu
```shell
def my_command [
    ...rest:int # My rest arg
] {
    echo 1 2 3
}
```

```shell
> source test.nu
> my_command -h
Usage:
  > my_command ...args {flags}

Parameters:
  ...args: My rest arg

Flags:
  -h, --help: Display this help message
```

* Fix space in help on wrong side
2021-01-23 07:13:29 +13:00
..
src parser/add rest args to def (#2961) 2021-01-23 07:13:29 +13:00
Cargo.toml Bump to 0.25.2 (#2908) 2021-01-12 07:50:53 +13:00
README.md First pass at updating all documentation formatting and cleaning up output of examples (#2031) 2020-06-24 06:21:47 +12:00

README.md

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.

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