* seemingly superfluous completions from code in completion.el
@ 2011-04-04 4:11 Alan
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From: Alan @ 2011-04-04 4:11 UTC (permalink / raw)
To: help-gnu-emacs
This is a post seeking enlightenment on the behavior of completion
functions as provided by the code in "completion.el". I initialize
this by the lines
(require 'completion)
(dynamic-completion-mode)
in my initialization file. I am using GNU Emacs 23.3.1 (i386-mingw-
nt5.1.2600) of 2011-03-10 on 3249CTO.
In the *scratch* buffer I type the following
01234567890123456789
I then type the line
012
and use the function "complete" five times, which offers me the typed-
in string shortened by one character each time after the first. If I
then use function "save-completions-to-file" and examine the result, I
see
("0123456789012345" . 361635)
("01234567890123456" . 361635)
("012345678901234567" . 361635)
("0123456789012345678" . 361635)
("01234567890123456789" . 361635)
as the saved completions. Four of these seem superfluous and not of
interest.
I can avoid these superfluous completions by making a change that
affects what the function "completion-before-command" does. It is
present in the hook:
"pre-command-hook" is "(completion-before-command tooltip-hide)"
The original definition is
(defun completion-before-command ()
(funcall (or (and (symbolp this-command)
(get this-command 'completion-function))
'use-completion-under-or-before-point)))
One way to make the change is to add to the property list of "self-
insert-command" the pair "completion-function (lambda ())", so that
'use-completion-under-or-before-point never gets used ahead of "self-
insert-command".
The enlightenment I seek is an explanation of what utility these
seemingly superfluous completions might have.
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