You can create, edit, list and view gists. You can't copy a link to a specific line (afaik). As you run this tool from your project directory you can browse and search code using your tools of choice.
It's an excellent tool even if you just use it to quickly create and view PRs and issues, as I do.
It's an excellent tool even if you just use it to quickly create and view PRs and issues, as I do.