I don't think I quite get this. Everything I paste here shows up in plain text. It doesn't automatically do any syntax highlighting; it only seems to work if you're already copying rich text to begin with.
I think "only works if you're copying rich text to begin with" is the kinda the point.
(I'm not affiliated with ctxt.io at all, just trying to understand it like you are.)
But you can install a plugin: http://monkeyhacks.com/post/sublime-text-3-copy-as-rtf-and-h...
http://www.pcgamer.com/why-the-creator-of-dwarf-fortress-is-...
I get similar results when copy&pasting.
Still needs fixing some image proxying bugs, will work on it, thanks!
To be fair I didn't really expect it to work with automagically copying the syntax highlighting from my IDE, but it made it sound like it could.
It's definitely a useful project, and surprising that nothing else like it exists, but may be worth making it clearer that it's designed for rich text, and may or may not work with formatting when pasting for various programs.
Atom: https://atom.io/packages/copy-with-syntax
VS Code: https://marketplace.visualstudio.com/items?itemName=atian25....
Sublime Text: https://github.com/n1k0/SublimeHighlight