This is a fork of Brett Terpstra's MultiMarkdown Quick Look with Style, which is a fork of Fletcher Penney's MMD QuickLook project.
This Quick Look Plug-in is for Day One entry files (.doentry). It does not replace other Markdown Quick Look plug-ins. It uses the same styling as Day One uses, as referenced from the company's github. If you want to add customize styling to the Quick Look plug-in, add .dayoneqlstyle.css to your home directory with your own styling.
To install, download the zip, unarchive and place the Day One QuickLook.qlgenerator file in ~/Library/QuickLook/. To make sure the Quick Look generator list reloads with the new file, you can run qlmanage -r on the command line.
To uninstall the plug-in, remove the the Day One QuickLook.qlgenerator file in ~/Library/QuickLook/. You might need to restart Quick Look for this to take effect. This can be done using the same command as above, qlmanage -r
Good question. Not sure. I just felt like doing it. I found myself annoyed by the fact that a huge ribbon would show up every time I tried to quick look at a Day One entry. Since Day One uses Markdown, I figured it would be easy to create.