Re: POLL: make C-x o transient

[Juri Linkov]

>> In this case it's easy to implement it as a minor mode that uses hooks,
>> e.g. last-char-repeatable-mode added to repeat.el.
>>
>> This could be like delete-selection-mode that by default
>> puts a special property on symbols of affected commands.
>
> I think this is the best way to implement this.  People who don't want
> to accept getting into transient states where not every self-insert key
> is self-inserting can turn the mode off entirely (and maybe bind 'repeat
> to C-z or something, which is what I do), and people who haven't had
> problems with that can turn it on once and have it work all over.

As Gregory noted, it's not clear which keys to use in every case:
for 'C-x o' it makes sense to use the shifted version "O" too,
for 'M-g n' also to use the opposite key "p".

It's possible to solve this by attaching own transient map
to each repeatable command like:

(put 'other-window 'repeat-map 'other-window-repeat-map)

(defvar other-window-repeat-map
  (let ((map (make-sparse-keymap)))
    (define-key map "o" 'other-window)
    (define-key map "O" (lambda () (interactive) (other-window -1)))
    map)
  "Keymap to navigate windows.")

(put 'next-error 'repeat-map 'next-error-repeat-map)
(put 'previous-error 'repeat-map 'next-error-repeat-map)

(defvar next-error-repeat-map
  (let ((map (make-sparse-keymap)))
    (define-key map "n" 'next-error)
    (define-key map "p" 'previous-error)
    map)
  "Keymap to navigate errors.")