If you're looking for a Sapling compatible hg-sl-up, you might want to take a look at my Rust implementation of this instead. It's faster, cleaner and more complete.
An interactive TUI smartlog for Sapling SCM, like git-sl-up but written in python3 and based on curses.
This is my own personal implementation for a tool available internally at Meta. FWIW, I do not have access to that tool's code so if they choose to open source the internal tool at any time, you should prefer that one over mine. I would ;)
# using pip
$ pip install sl-up
# or with pipx
$ pipx install git+https://github.com/vuduchild/sl-up.git