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# Description #11492 fixed flags for builtin commands but I missed that plugins don't use the same `has_flag` that builtins do. This PR addresses this. Unfortunately this means that return value of `has_flag` needs to change from `bool` to `Result<bool, ShellError>` to produce an error when explicit value is not a boolean (just like in case of `has_flag` for builtin commands. It is not possible to check this in `EvaluatedCall::try_from_call` because # User-Facing Changes Passing explicit values to flags of plugin commands (like `--flag=true` `--flag=false`) should work now. BREAKING: changed return value of `EvaluatedCall::has_flag` method from `bool` to `Result<bool, ShellError>` # Tests + Formatting Added tests and updated documentation and examples
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.