Everyone loves GitHub-flavored Markdown. A problem of interest for some time now is rendering, editing, and saving Markdown with GitHub rendering style.
This is something that has interested me since at least 2018. Indeed, I have been using grip for Markdown preview, conversion, and saving to PDF on macOS for years, as I detailed previously in one of my other popular Gists here.
However, lately, I've started running into GitHub API limits. I even had issues with this with grip when I passed my user id and password with grip using the --user and --pass flags, respectively, but this still did not overcome the GitHub limits. Of course, I found this quite interrupting of my flow (no one wants to wait an hour to be able to continuously update the rendering of an open file again), so I looked into other options.
I learned that Atom has a nice Markdown preview package built in now (available by default, and on GitHub here). So, my current approach is to build my GitHub-flavored Markdown document in Atom with the preview function running, then to do a 'final' run with grip and save as PDF from my browser window (e.g. Safari).
Of note, I also tried glow. It is cool but not as nice looking and doesn't really seem to work well for my purposes, so I can't recommend it.
Additionally, I tried the editR R package with poor results. I could get the shiny app to run but I could not get it to correctly display my markdown, so I cannot recommend it.
Hope this helps someone.
~J