I'd like to advise a /keybinding/, how do I do it?

[Marcin Borkowski]

Hello everyone,

what I'd like to do is to "advise a keybinding", IOW, advise whatever
command a given key is bound to.  How do I get the name of the command
given a key, and taking into account the current major mode, minor modes
etc.?

I tried to look at the source code of `describe-key-briefly', but it is
pretty dense, and maybe there's a better way than diving into that
rabbit hole.

The rationale is that I'm thinking about writing a minor mode which
could prevent a "finishing" action until the buffer is ready.
A "finishing" action is often bound to C-c C-c (sending an email and
commiting something to Git come to mind), so I'd like to advise whatever
C-c C-c calls to check the buffer for occurrences of a string like TODO.

Of course, a more robust way would be to have a list of various major
modes and their "finishing" commands, but I think the idea with just
looking up C-c C-c is cute (even if not very robust), and I was
wondering if it can be done in a simple way, even as a toy.

Any ideas?

-- 
Marcin Borkowski
http://mbork.pl