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Sat, 6 Feb 2021 00:45:48 +0000 Thread-Topic: [External] : Re: Concern about new binding. 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:264035 Archived-At: > > If there are _several_ keys that you can bind > > keymaps to, then that offers more possibilities > > than if there is only _one_ key that you can > > bind a keymap to. >=20 > I'm not sure I see what you mean. It's not _one_ key. Having a > complete keymap at the disposal of third-party libraries means > that there are (at least) 26 letters free; each of them can be > bound to a separate keymap. Yes, of course. I already acknowledged that. That's still much less than what can be bound to several such prefix keys. _Of course_ you can bind each letter to a prefix key. But you can do the same on any of the still-free keys. And there are more than one of those. (More than one is, well, more than one.) What's more, if you put everything on only a single prefix key, then that leads to deeper (i.e., longer) key bindings. For example, I use `C-x x' as a prefix key for Bookmark+ keys other than specific kinds of bookmark jumping. I use `C-x j' and `C-x 4 j' as prefix keys for bookmark jumping commands. Without being able to use more than one prefix key, the jump commands would all be a level deeper (longer key sequences). And the jump prefix keys themselves already have multiple levels of prefix keys. E.g., `C-x j t . % +' jumps to a file bookmark in the current dir (`.') that has a tag (`t') that matches a given regexp (`%') you're prompted for. Those keys are systematic and mnemonic, but that's already several prefix keys deep. I've seen no reason, so far, why we should limit 3rd-party libraries to a single prefix key - even if one can of course keep extending a prefix key by adding deeper layers. Better to have _several_ free keys for 3rd-party libraries than to have only one. That's the point. No argument for how you can put lots of stuff on a single prefix key can overcome the fact that more prefix keys give you more than does one prefix key. https://www.emacswiki.org/emacs/BookmarkPlus#BookmarkPrefixKeys