It would be nice to not need to go the documentation website. This aims
to solve that by introducing the concept of keyword to the help
command.
Basically, keywords are things that we want to add help messages to,
but they don't necessarily have an associated subcommand.
For now we only have two keywords:
- `revsets`: Shows the docs for revsets
- `tutorial`: Shows the tutorial that is on the documentation
You get the keyword content by tipping `jj help --keyword revsets` or
`jj help -k revsets`.
You can also list the available keywords with `jj help --help`.
It would be nice to have all the documentation on the keywords, maybe
a next commit could do it.
The default clap's help command doesn't have the ability to accept flags
(e.g --no-pager). The recommended way[1] to solve this is to manually
implement it.
[1]: https://github.com/clap-rs/clap/discussions/5332Fixes: #4501
