nushell/crates/nu-engine/src
JT eaec480f42
Improve empty pipelines (#7383)
# Description

This fix changes pipelines to allow them to actually be empty. Mapping
over empty pipelines gives empty pipelines. Empty pipelines immediately
return `None` when iterated.

This removes a some of where `Span::new(0, 0)` was coming from, though
there are other cases where we still use it.

# User-Facing Changes

None

# 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.
2022-12-08 07:31:57 +13:00
..
call_ext.rs Friendly error message for access beyond end (#6944) 2022-10-29 19:47:50 +02:00
column.rs Improve CantFindColumn and ColumnAlreadyExists errors (#7164) 2022-11-19 09:35:55 -08:00
documentation.rs Protocol: debug_assert!() Span to reflect a valid slice (#6806) 2022-12-03 11:44:12 +02:00
env.rs Improve empty pipelines (#7383) 2022-12-08 07:31:57 +13:00
eval.rs Improve empty pipelines (#7383) 2022-12-08 07:31:57 +13:00
glob_from.rs Run a round of clippy --fix to fix a ton of lints (#7006) 2022-11-04 15:11:17 -05:00
lib.rs New commands: break, continue, return, and loop (#7230) 2022-11-25 09:39:16 +13:00
scope.rs Add input-output types to $nu.scope.commands (#7105) 2022-11-12 14:26:20 -08:00