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Nothing used the `ptree` feature or optional dependency within `nu-command` except to include it within the `version` output. This may be related to when `nu-cli` also had a `ptree` feature, but I'm not sure. That leaves the code within `nu_plugin_tree` as the sole remaining user of `ptree`, which is already covered by the feature `tree` and included in the `version` output.
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 differnt capabilities like working with different file types, charting, viewing binary data, and more.