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52d99cc60c
This PR changes `$env` to be **case-preserving** instead of case-sensitive. That is, it preserves the case of the environment variable when it is first assigned, but subsequent retrieval and update ignores the case. Notably, both `$env.PATH` and `$env.Path` can now be used to read or set the environment variable, but child processes will always see the correct case based on the platform. Fixes #11268. --- This feature was surprising simple to implement, because most of the infrastructure to support case-insensitive cell path access already exists. The `get` command extracts data using a cell path in a case-insensitive way (!), but accepts a `--sensitive` flag. (I think this should be flipped around?)
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.