Improve usability of the ls command

[Bzero]

Currently the ls command seems a bit inconvenient to use for me since it outputs a long, yet a bit sparse list of text requiring a lot of scrolling to find the variable, function or unit I am actually looking for.

To improve I would suggest two changes:

• Use a multi-column layout to reduce the vertical space a bit and to get an immediate glance on all defined variables/functions.
• Add subcommands ls variables, ls functions, ls units and ls dimensions to add the possibility to list only variables, functions, units or dimensions, respectively.

[sharkdp]

Thank you for the feedback — I fully agree!

Use a multi-column layout to reduce the vertical space a bit and to get an immediate glance on all defined variables/functions.

👍

Add subcommands ls variables, ls functions, ls units and ls dimensions to add the possibility to list only variables, functions, units or dimensions, respectfully.

👍

Maybe we can also come up with a syntax to specifically look up length units, for example? Like ls units Length. Because that should be fairly easy to implement as well.

[sharkdp]

Released in https://github.com/sharkdp/numbat/releases/tag/v1.8.0

[Bzero]

Very nice, thanks a lot!