Somehow show content snippets without breaking piping

[pimterry]

A lot of the time, it's useful to be able to see intro snippets of content when flicking through your notes. There's a few way to do this, but an important constraint is that anything that does this needs to play nicely with piping. You must be able to pipe the results of a search into notes open and open all the matching notes.

Implementation options:

• Command line option (--snippets?) which adds snippets to output.
• Separate command which provides snippets for the given files (notes find | notes snippets? | notes head?).
• Output snippets when stdout is a tty, but hide them and output only the file names if it's not.

Thoughts welcome.