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command chains feature request

From: Le Wang
Subject: command chains feature request
Date: Mon, 29 Oct 2012 23:23:53 +0800

Hi all,

Here is an example scenario: I have multiple minor-modes that bind to
space key.

In xxx if I'm at the beginning of a comment, then it indents the whole
comment.  In mode yyy if I'm at the beginning of paired delimiters, it
adds padding spaces to the end as well.  The exact details of these
modes aren't crucial.

Now xxx and yyy authors are smarty pantsesses.  They decided to write
their commands such that if the context doesn't require special
action, instead of inserting spaces, they'd just lookup the current
key-binding the the last input event (taking their minor-mode out of
consideration).  In this way both modes share the space key very

However when I do "C-h k SPC", the help documentation does not show me
this current state of things.  Instead it shows me the help for
whichever command currently has higher priority.

Autopair does some on the fly doc generation magic to say what the
fallback command is, but that's not ideal since the fallback could
have its own fallback.

Can Emacs have some features that make writing inter-operable commands
easier, as well as generating help that explains the chain of commands
in fallback order?

I'm sure this isn't the right forum for a feature request.  But we can
discuss it here first.


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