nushell/crates/nu-protocol/src
Reilly Wood 6a274b860a
Cell paths: make optional path members short-circuit (#8554)
This is a follow-up to https://github.com/nushell/nushell/pull/8379 and
https://github.com/nushell/nushell/discussions/8502.

This PR makes it so that the new `?` syntax for marking a path member as
optional short-circuits, as voted on in the
[8502](https://github.com/nushell/nushell/discussions/8502) poll.
Previously, `{ foo: 123 }.bar?.baz` would raise an error:

```
> { foo: 123 }.bar?.baz
  × Data cannot be accessed with a cell path
   ╭─[entry #15:1:1]
 1 │ { foo: 123 }.bar?.baz
   ·                   ─┬─
   ·                    ╰── nothing doesn't support cell paths
   ╰────
   ```

Here's what was happening:

1. The `bar?` path member access returns `nothing` because there is no field named `bar` on the record
2. The `baz` path member access fails when trying to access a `baz` field on that `nothing` value

After this change, `{ foo: 123 }.bar?.baz` returns `nothing`; the failed `bar?` access immediately returns `nothing` and the `baz` access never runs.
2023-03-23 09:54:19 +13:00
..
ast Revert "Allow NU_LIBS_DIR and friends to be const" (#8501) 2023-03-17 09:33:24 -05:00
engine fix: fix commandline when called with no arguments (#8207) 2023-03-16 17:45:35 -05:00
value Cell paths: make optional path members short-circuit (#8554) 2023-03-23 09:54:19 +13:00
alias.rs Document and critically review ShellError variants - Ep. 3 (#8340) 2023-03-06 18:33:09 +01:00
cli_error.rs Clippy fix for Rust 1.63 (#6299) 2022-08-11 11:54:54 -05:00
config.rs feat: add a command_not_found hook (#8314) 2023-03-20 17:05:22 +13:00
example.rs remove unused imports: Deserialize, Serialize compiler warning for nu-protocol/src/example.rs (#8514) 2023-03-18 11:45:12 -07:00
exportable.rs Removes export env command (#6468) 2022-09-25 19:52:43 +03:00
id.rs Overlays (#5375) 2022-05-08 07:39:22 +12:00
lev_distance.rs Reduce again the number of match calls (#7815) 2023-01-24 12:23:42 +01:00
lib.rs Re-implement aliases (#8123) 2023-02-27 20:44:05 +13:00
module.rs Allow main command to define top-level module command (#7764) 2023-01-22 21:34:15 +02:00
pipeline_data.rs Disable pipeline echo (#8292) 2023-03-17 11:53:46 +13:00
plugin_signature.rs Make plugin commands support examples. (#7984) 2023-02-08 16:14:18 -06:00
shell_error.rs Document and critically review ShellError variants - Ep. 3 (#8340) 2023-03-06 18:33:09 +01:00
signature.rs view span & view files commands (#7989) 2023-02-09 11:35:23 -06:00
span.rs Use variable names directly in the format strings (#7906) 2023-01-29 19:37:54 -06:00
syntax_shape.rs Use variable names directly in the format strings (#7906) 2023-01-29 19:37:54 -06:00
ty.rs Display empty records and lists (#7925) 2023-02-22 16:18:33 +00:00
util.rs move BufferedReader out of nu-command (#7697) 2023-01-06 15:22:17 -08:00
variable.rs Limited mutable variables (#7089) 2022-11-11 19:51:08 +13:00