Jakub Žádník 2388e1e80b Reorder export-env eval and allow reloading an overlay (#7231) ... # Description This PR is a response to the issues raised in https://github.com/nushell/nushell/pull/7087. It consists of two changes: * `export-env`, when evaluated in `overlay use`, will see the original environment. Previously, it would see the environment from previous overlay activation. * Added a new `--reload` flag that reloads the overlay. Custom definitions will be kept but the original definitions and environment will be reloaded. This enables a pattern when an overlay is supposed to shadow an existing environment variable, such as `PROMPT_COMMAND`, but `overlay use` would keep loading the value from the first activation. You can easily test it by defining a module ``` module prompt { export-env { let-env PROMPT_COMMAND = (date now | into string) } } ``` Calling `overlay use prompt` for the first time changes the prompt to the current time, however, subsequent calls of `overlay use` won't change the time. That's because overlays, once activated, store their state so they can be hidden and restored at later time. To force-reload the environment, use the new flag: Calling `overlay use --reload prompt` repeatedly now updates the prompt with the current time each time. # User-Facing Changes * When calling `overlay use`, if the module has an `export-env` block, the block will see the environment as it is _before_ the overlay is activated. Previously, it was _after_. * A new `overlay use --reload` flag. # 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 -A clippy::needless_collect` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass # 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.		2022-11-24 23:45:24 +01:00
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samples	Removes export env command (#6468)	2022-09-25 19:52:43 +03:00
mod.rs	Reorder export-env eval and allow reloading an overlay (#7231)	2022-11-24 23:45:24 +01:00