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bug#68487: [PATCH] Make jump commands usable for all skeletons
From: |
martin |
Subject: |
bug#68487: [PATCH] Make jump commands usable for all skeletons |
Date: |
Thu, 21 Mar 2024 20:05:04 -0400 |
Eli Zaretskii <eliz@gnu.org> writes:
> Ping! Martin, can you please respond to Stefan's comments, so we
> could move forward with this issue?
Sorry for the long delay in responding. I'll try to get to this by the
end of the weekend.
>> Cc: 68487@debbugs.gnu.org
>> Date: Sat, 02 Mar 2024 23:07:18 -0500
>> From: Stefan Monnier via "Bug reports for GNU Emacs,
>> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>> >> Ideally this should go along with the removal of the use of a vector in
>> >> `expand-list`, which not only is odd given its name but is odd because
>> >> it seems completely useless.
>> >
>> > Nothing (at least nothing in Emacs core) stores a vector to
>> > `expand-list`. So I'm curious why `expand-abbrev-hook` was written to
>> > account for that possibility.
>>
>> It's because it internally did that, tho I don't know why it did that
>> internally since my patch seems to show that it's simpler not to.
>>
>> > Changing `expand-abbrev-hook` to expect `expand-list` to actually be a
>> > list (as you did with your patch) makes sense to me.
>>
>> Should I install it, so it's kept separate from the changes you add
>> on top (mostly for readability of the patches)?
>>
>> > What do you think?
>>
>> I find the patch a bit hard to read, maybe for lack of a separate
>> description of the intended changes, or maybe because it does too much
>> in a single step.
>>
>> I have one question, tho:
>>
>> > (defun expand-do-expansion ()
>> > - (delete-char (- (length last-abbrev-text)))
>> > - (let* ((vect (symbol-value last-abbrev))
>> > - (text (aref vect 0))
>> > - (position (aref vect 1))
>> > - (jump-args (aref vect 2))
>> > - (hook (aref vect 3)))
>> > - (cond (text
>> > - (insert text)
>> > - (setq expand-point (point))))
>> > - (if jump-args
>> > - (funcall #'expand-build-list (car jump-args) (cdr jump-args)))
>> > - (if position
>> > - (backward-char position))
>> > - (if hook
>> > - (funcall hook))
>> > - t))
>> > -
>> > -(defun expand-abbrev-from-expand (word)
>> > - "Test if an abbrev has a hook."
>> > - (or
>> > - (and (intern-soft word local-abbrev-table)
>> > - (symbol-function (intern-soft word local-abbrev-table)))
>> > - (and (intern-soft word global-abbrev-table)
>> > - (symbol-function (intern-soft word global-abbrev-table)))))
>> > -
>> > -(defun expand-previous-word ()
>> > - "Return the previous word."
>> > - (save-excursion
>> > - (let ((p (point)))
>> > - (backward-word 1)
>> > - (buffer-substring p (point)))))
>> > + ;; expand-point tells us if we have inserted the text
>> > + ;; ourself or if it is the hook which has done the job.
>> > + (if (listp expand-list)
>> > + (setq expand-index 0
>> > + expand-pos (expand-list-to-markers expand-list)
>> > + expand-list nil))
>> > + (run-hooks 'expand-expand-hook))
>>
>> Hmm... but this `expand-do-expansion` doesn't actually "do" any
>> expansion any more, right?
>>
>> > (defun expand-skeleton-end-hook ()
>> > - (if skeleton-positions
>> > - (setq expand-list skeleton-positions)))
>> > + (when skeleton-positions
>> > + (setq expand-list skeleton-positions)
>> > + (expand-do-expansion)))
>>
>> Here if you read the code out loud it doesn't make sense to call
>> `expand-do-expansion` since skeleton has already "done the expansion".
>>
>>
>> Stefan
>>
>>
>>
>>
>>
--
Best regards,
Martin Marshall