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bug#15980: 24.3.50; `minibuffer-complete-word': case where it does not w

From: Bastien Guerry
Subject: bug#15980: 24.3.50; `minibuffer-complete-word': case where it does not work correctly
Date: Tue, 07 Jan 2014 13:04:55 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

Drew Adams <address@hidden> writes:

> Seems like the behavior is wrong in this case, but I see that the same
> behavior is found for Emacs 20 through 24.  So I cannot say for sure
> whether this is a bug.  At least the behavior does not seem to follow
> the doc.
> The doc ((emacs) `Completion Commands') says that SPC does this:
>   Complete up to one word from the minibuffer text before point
>   (`minibuffer-complete-word').
> emacs -Q
> (defun cmd\ \ \ \ w\ ith\ spaces () (interactive) (message "SPACES"))
> (defun cmd-without-spaces () (interactive) (message "NOPE"))
> M-x cm SPC ; correctly completes to `cmd'
> SPC        ; completes to `cmd '
> Since SPC is supposed to complete a word at a time, and since both ` '
> and `-' are word separators, I would expect that there are two
> word completions for the prefix `cmd': `cmd ' and `cmd-'.
> So I would expect to see *Completions* displayed, showing the two
> candidates `cmd    w ith spaces' and `cmd-without-spaces'.

See the first comment in `completion--try-word-completion':
the function considers that either a space *or* an hyphen will
be used to separate words.  The "or" is exclusive.

> Admittedly, this is a corner use case.

Yes -- note that TAB works fine here instead of SPC.

The only place I can think of where this could be a problem
is the info manual (`g' or `i' to go to a node or to find an
index entry.)  Still, you're not like to stumble on such case.

I'm for closing this bug until it really hit someone.

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