Receive-edit-send loop

[manpages]

Right now we can only instantiate blog posts with blog.

It's good enough, I edit my posts on remote anyway and this program just simplifies timestamping
and file placement.

Ideally though, we'd like to be able to say something like

λ blog edit haskonf

and get output like

Posts matching "haskonf":
1. 2015-08-18-haskonf.html
One post matched, not querying for post number...
Launching $EDITOR

then edit the file and send it back (optionally with refreshed timestamp).

Also, if there is no existing blog post that matches selector, we should be able to start writing new one:

λ blog edit abrakadabra
Posts matching "abrakadabra":
No posts found, do you want to write a new one called "abrakadabra"? [Yn]

Launching $EDITOR