Render markdown from stdin rather than tmpfile

[shazow]

I noticed that there's a bunch of code dealing with creating/reading/cleaning up temporary files, but also that all of the markdown renderers support reading from stdin:

• echo "foo" | glow -
• echo "foo" | mdr
• echo "foo" | mdcat

Would it be worth to simplify the code and generalize the parser command support to just take any command that reads from stdin?

[shazow]

I did some research on how to do this and turns out it's quite tricky, since there aren't good controls for disabling tty echo on stdin.

My rough one-liner for how I was trying to do it:

let bufid = bufnr('%') | new | let id = termopen('mdcat') | call chansend(id, getbufline(bufid, 1, '$') + ["\r", "\004"])

There's a neovim issue that got marked for the v0.5 release milestone that would allow this (neovim/neovim#9107), but I'm not sure about oldvim.

Feel free to close this issue if you agree that it's not feasible. :)

[skanehira]

Thank you for your proposed :)
I agree with your idea but I was try use stdin and it was doesn't works fined.
I'll try again 👍