nushell/crates/nu-parser
Leonhard Kipp d0a2a02eea
Add possibility to declare optional parameters and switch flags (#2966)
* Add possibility to declare optional parameters and switch flags

With this commit applied it is now possible to specify optional parameters and flags
as switches. This PR **only** makes guarantees about **parsing** optional flags and
switches correctly. This PR **does not guarantee flawless functionality** of
optional parameters / switches within scripts.
functionality within scripts. Example:

test.nu
```shell
def my_command [
    opt_param?
    opt_param2?: int
    --switch
] {echo hi nushell}
```

```shell
> source test.nu
> my_command -h
───┬─────────
 0 │ hi
 1 │ nushell
───┴─────────
Usage:
  > my_command <mandatory_param> (opt_param) (opt_param2) {flags}

Parameters:
  <mandatory_param>
  (opt_param)
  (opt_param2)

Flags:
  -h, --help: Display this help message
  --switch
  --opt_flag <any>
```

* Update def docs
2021-01-28 06:31:29 +13:00
..
src Add possibility to declare optional parameters and switch flags (#2966) 2021-01-28 06:31:29 +13:00
Cargo.toml Bump to 0.26.0 (#2974) 2021-01-26 23:07:08 +13:00