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# Description This PR adds a few functions to `Span` for merging spans together: - `Span::append`: merges two spans that are known to be in order. - `Span::concat`: returns a span that encompasses all the spans in a slice. The spans must be in order. - `Span::merge`: merges two spans (no order necessary). - `Span::merge_many`: merges an iterator of spans into a single span (no order necessary). These are meant to replace the free-standing `nu_protocol::span` function. The spans in a `LiteCommand` (the `parts`) should always be in order based on the lite parser and lexer. So, the parser code sees the most usage of `Span::append` and `Span::concat` where the order is known. In other code areas, `Span::merge` and `Span::merge_many` are used since the order between spans is often not known.
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.