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d8f13b36b1
This is another attempt on #11288 This allows for a `Stack` to have a parent stack (behind an `Arc`). This is being added to avoid constant stack copying in REPL code. Concretely the following changes are included here: - `Stack` can now have a `parent_stack`, pointing to another stack - variable lookups can fallback to this parent stack (env vars and everything else is still copied) - REPL code has been reworked so that we use parenting rather than cloning. A REPL-code-specific trait helps to ensure that we do not accidentally trigger a full clone of the main stack - A property test has been added to make sure that parenting "looks the same" as cloning for consumers of `Stack` objects --------- Co-authored-by: Raphael Gaschignard <rtpg@rokkenjima.local> Co-authored-by: Ian Manske <ian.manske@pm.me> |
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nu-protocol
The nu-protocol crate holds the definitions of structs/traits that are used throughout Nushell. This gives us one way to expose them to many other crates, as well as make these definitions available to each other, without causing mutually recursive dependencies.