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20834c9d47
This allows performance debugging to be turned on by setting: ```nushell $env.POLARS_PLUGIN_PERF = "true" ``` Furthermore, this improves the other plugin debugging by allowing the env variable for debugging to be set at any time versus having to be available when nushell is launched: ```nushell $env.POLARS_PLUGIN_DEBUG = "true" ``` This plugin introduces a `perf` function that will output timing results. This works very similar to the perf function available in nu_utils::utils::perf. This version prints everything to std error to not break the plugin stream and uses the engine interface to see if the env variable is configured. This pull requests uses this `perf` function when: * opening csv files as dataframes * opening json lines files as dataframes This will hopefully help provide some more fine grained information on how long it takes polars to open different dataframes. The `perf` can also be utilized later for other dataframes use cases.
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.