#407 Use run-hook-with-args

[Bill Wohler]

Jeff says:

There is at least one place in mh-e where we jump
through hoops to get the same functionality as
run-hook-with-args. Do all the versions of emacs that
we support have this function? I've verified that 20.4
and 21.1 both have it.

If so, we should clean up our code.
------
Jeff is correct.

Peter, Steve, do you see run-hook-with-args on XEmacs?
Please post a note with your findings. If yes, we can
simply use run-hook-with-args. If not, we can add
(another) compatibility function to mh-utils defined
with mh-defun-compat.

[Peter S Galbraith]

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In XEmacs21:

`run-hook-with-args' is a built-in function

Documentation:
Run HOOK with the specified arguments ARGS.
HOOK should be a symbol, a hook variable. If HOOK has a non-nil
value, that value may be a function or a list of functions to be
called to run the hook. If the value is a function, it is
called with
the given arguments and its return value is returned. If it
is a list
of functions, those functions are called, in order,
with the given arguments ARGS.
It is best not to depend on the value returned by
`run-hook-with-args',
as that may change.

To make a hook variable buffer-local, use `make-local-hook',
not `make-local-variable'.

[Bill Wohler]

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Closing. We should use normal hooks whenever we can. Rather
than call run-hook-with-args, use let to set some scoped
variables, call run-hooks, and document those variables in
the hook documentation.

[Bill Wohler]

Ticket moved from /p/mh-e/feature-requests/50/