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9ce61dc677
Closes #9003. This PR changes `group-by` so that its optional argument is interpreted as a cell path. In turn, this lets users use `?` to ignore rows that are missing the column they wish to group on. For example: ``` > [{foo: 123}, {foo: 234}, {bar: 345}] | group-by foo Error: nu:🐚:column_not_found × Cannot find column ╭─[entry #3:1:1] 1 │ [{foo: 123}, {foo: 234}, {bar: 345}] | group-by foo · ─────┬──── ─┬─ · │ ╰── cannot find column 'foo' · ╰── value originates here ╰──── > [{foo: 123}, {foo: 234}, {bar: 345}] | group-by foo? ╭─────┬───────────────╮ │ 123 │ [table 1 row] │ │ 234 │ [table 1 row] │ ╰─────┴───────────────╯ ``` ~~This removes the ability to pass `group-by` a closure or block (I wasn't able to figure out how to make the 2 features coexist), and so it is a breaking change. I think this is OK; I didn't even know `group-by` could accept a closure or block because there was no example for that functionality.~~
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.