[philips]

I have been using pass[1]. Lots of git hosting providers out there and mobile apps. I just have an alias that runs

  pass edit journal/$(date '+%Y-%m-%d')

And I run the alias when the mood hits me. Then

  pass git push origin

[1] https://www.passwordstore.org/

[topmonk]

Also use pass (for passwords). That's a clever hack, thanks.