I'm using hideshow and I like it. The package is recommending me that I use the keys C-c @ C-h to hide a block instead of typing some really long command. I'm familiar with C-c and with C-h, but I can't figure out what the @ means.
@ doesn't mean anything, by itself, beside representing the @ key on your keyboard.
The key sequence C-c @ C-h is bound to command hs-hide-block in hs-minor-mode, that is, in keymap hs-minor-mode-map.
In that key sequence,
C-cis a prefix key, which means it's bound to a keymap.In that keymap,
@is a prefix key, which means it's bound to a keymap.In that keymap,
C-his bound to commandhs-hide-block
In hs-minor-mode, type C-c C-h to see the key bindings on prefix key C-c.
Conventionally, typing C-h after a prefix key shows you all of the keys on that prefix key. Prefix key C-c @ disobeys this convention, so C-c @ C-h does not show you all the keys on prefix key C-c @. Instead, it gives you hs-hide-block.
(IMHO, that's unfortunate, but presumably the author thought otherwise.)
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1@npostavs: Yes. Good point. (IMHO, it's still too bad to not support the convention also with
C-h.) – Drew Nov 17 '19 at 1:44
I'm familiar with C-c and with C-h, but I can't figure out what the @ means.
It's the literal character @ for which your keyboard should have a key (or key sequence). On my keyboard @ is Shift+2.
So just type Ctrl+C and then type @
Conceptually it's no different to being told to type C-c a (for example).
