It would be awesome if Sapling could be generalized to work with other git hosting providers. According to JetBrains 2020 survey, 77% of respondents regularly use GitHub, 40% GitLab, and 25% BitBucket

I tried to use Sapling with a GitLab repo and it looks like GitHub is a pretty deeply baked in assumption (for URL paths etc).

For example, sl pr failed at url.host == "[github.com](http://github.com/)" check

Aside: Thanks for open-sourcing Sapling and ReviewStack! I'm really excited for the simplified workflow for managing stacks of small commits!