Joćo, Thanks for the detailed reply.  Our replies to Stefan crossed each
other.

On Sat, Dec 28, 2013 at 10:59 AM, Joćo Tįvora <joaotavora@gmail.com> wrote:
>
> Anyway, the other 30% are probably legitimate cases where the user that
> activated both yas-minor-mode and auto-complete-mode in a buffer
> probably wants something like the following to happen:
>
>    1. Press TAB
>
>    2. If theres an active snippet key preceding point, expand it and
>       leave
>
>    3. Else attempt autocompletion at point, bring up a menu, whatever it
>       does
>
>    4. Else do whatever TAB is bound to


> I wrote "probably" because I don't think I ever got a precise
> description that clarified the desired interaction. That is, maybe some
> users want 2 and 3 reversed.
>

Yes, that (yasnippet ahead of autocomplete) is what I have attempted to
configure for myself.  To ensure 3 remains accessible I try to give my
snippets names with low likelihoods for collision.

[..SNIP..]

Again, thanks for the long authoritative reply.  My take away is that
configuring multiple packages to trigger in some meaningful, predictable
manner from a single event is currently part of the "dark arts", not
something newbies should attempt.  It would be wonderful if some structure
and formalism could be brought to this area.

/john