Re: RE: Built-In Keybindingr associated with functions keys F2, F3, etc

[Christopher Dimech]

The most useful one I found was "C-h b".


> Sent: Saturday, October 24, 2020 at 6:49 PM
> From: "Drew Adams" <drew.adams@oracle.com>
> To: "Eli Zaretskii" <eliz@gnu.org>, help-gnu-emacs@gnu.org
> Subject: RE: Built-In Keybindingr associated with functions keys  F2, F3, etc
>
> > > > You can usually get that information for any prefix key by typing
> > > > `<prefix> C-h'.  So for example `<f2> C-h' shows:...
> > >
> > > (But <f1>, <f3>, <f4>, <f10>, <f11> are not,
> > > by default, prefix keys.)
> >
> > Why does that matter, for the issue at hand?  This is a kind of rigor
> > that should have no place in this discussion.  Tassilo is factually
> > correct: the way he pointed out _is_ the way of asking Emacs about key
> > sequences that start with a given key.
>
> (FWIW, your hostility is what "has no place in
> the discussion."  Lighten up a little, please.)
>
> I simply pointed out that what the OP asked about
> isn't completely answered by the (otherwise fine)
> answer that you can use C-h after a prefix key.
>
> If Tassilo hadn't mentioned using C-h after a
> prefix key, then I would have.  That's a general,
> if partial, answer to the OP's question, and a
> very good one.
>
> My post tried to respond directly to the question
> about F2, F3, etc.:
>
>   There are 48 bindings starting with <f1>.
>   Is there a list somewhere on Built-In Emacs
>   Keybindings associated with the other functions
>   keys (F2, F3, etc)?
>
> > > <f1> is bound to `help-command', which is a
> > > prefix command, and `C-h f help-command' tells
> > > you its definition is a keymap.  But `<f1> C-h'
> > > doesn't tell you about keys with prefix <f1>.
> >
> > It does here.
>
> I should have said that it doesn't tell you about
> ALL of the keys with prefix <f1>.  And it doesn't
> tell you the same thing that C-h following a
> prefix key tells you: the _commands_ that are
> bound to the keys.
>
> (That's not its purpose.  It tells you what kinds
> of things you can do with C-h, which is fine.)
>
> For example, `<f1> C-h' doesn't tell you about
> these six keys following <f1>: C-h, C-\, ?, <f1>,
> q, and `4 i'.
>
> To be clear, I'm not saying it should or needs to.
> But if someone is asking for a _list of all_ the
> keys you can use after <f1>, `<f1> C-h' doesn't do
> that.
>
> [4 of the 6 unlisted keys are bound to commands
> that are also bound to other keys that `<f1> C-h'
> _does_ tell you about.  So it tells you how to do
> those things.  But it doesn't tell you all of the
> keys that let you do them.  And it doesn't tell
> you which commands are involved and provide links
> to their `C-h f' help.  And it misses the keys
> for `help-quit' and `info-other-window'.]
>
> Another difference: The help you see from `<f1>
> C-h' is hard-coded.  If someone or some library
> adds key bindings to keymap `help-map' then you
> won't see them listed by `<f1> C-h'.  (If the
> usual behavior of C-h following a prefix key
> were followed, then you would see them listed.)
> ___
>
> To add a bit to my answer: if you use library
> help-fns+.el then you can use `C-h M-k help-map'
> to see all of that keymap's key bindings (in the
> same format used by `C-h b', or C-h following a
> prefix key).
>
> https://www.emacswiki.org/emacs/download/help-fns%2b.el
>
>