Darren Schroeder 1940b36e07
Add environment variables for sourced files (#14486)
# Description

I always wondered why the module env vars `CURRENT_FILE`, `FILE_PWD`,
`PROCESS_PATH` weren't available in the source command. I tried to add
them here. I think it could be helpful but I'm not sure. I'm also not
sure this hack is what we should do but I thought I'd put it out there
for fun.

Thoughts?

### Run Module (works as it did before)

```nushell
❯ open test_module.nu
def main [] {
  print $"$env.CURRENT_FILE = ($env.CURRENT_FILE?)"
  print $"$env.FILE_PWD = ($env.FILE_PWD?)"
  print $"$env.PROCESS_PATH = ($env.PROCESS_PATH?)"
}
❯ nu test_module.nu
$env.CURRENT_FILE = /Users/fdncred/src/nushell/test_module.nu
$env.FILE_PWD = /Users/fdncred/src/nushell
$env.PROCESS_PATH = test_module.nu
```
### Use Module (works as it did before)
```nushell
❯ open test_module2.nu
export-env {
  print $"$env.CURRENT_FILE = ($env.CURRENT_FILE?)"
  print $"$env.FILE_PWD = ($env.FILE_PWD?)"
  print $"$env.PROCESS_PATH = ($env.PROCESS_PATH?)"
}
❯ use test_module2.nu
$env.CURRENT_FILE = /Users/fdncred/src/nushell/test_module.nu
$env.FILE_PWD = /Users/fdncred/src/nushell
$env.PROCESS_PATH =
```
### Sourced non-module script (this is the new part)

> [!NOTE] 
> Note: We intentionally left out PROCESS_PATH since it's supposed to
> to work like argv[0] in C, which is the name of the program being
executed.
> Since we're not executing a program, we don't need to set it.


```nushell
❯ open test_source.nu
print $"$env.CURRENT_FILE = ($env.CURRENT_FILE?)"
print $"$env.FILE_PWD = ($env.FILE_PWD?)"
print $"$env.PROCESS_PATH = ($env.PROCESS_PATH?)"
❯ source test_source.nu
$env.CURRENT_FILE = /Users/fdncred/src/nushell/test_source.nu
$env.FILE_PWD = /Users/fdncred/src/nushell
$env.PROCESS_PATH = 
```

Also, what is PROCESS_PATH even supposed to be?

# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->

# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to
check that you're using the standard code style
- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the
tests for the standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->

# After Submitting
<!-- If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
-->
2024-12-02 06:19:20 -06:00
..
2022-02-07 14:54:06 -05:00

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.