This section describes functions used to scan all the current keymaps for the sake of printing help information.
(key .
map), where key is a prefix key whose definition in
keymap is map.
The elements of the alist are ordered so that the key increases
in length. The first element is always ("" . keymap),
because the specified keymap is accessible from itself with a prefix of
no events.
If prefix is given, it should be a prefix key sequence; then
accessible-keymaps includes only the submaps whose prefixes start
with prefix. These elements look just as they do in the value of
(accessible-keymaps); the only difference is that some elements
are omitted.
In the example below, the returned alist indicates that the key
ESC, which is displayed as `^[', is a prefix key whose
definition is the sparse keymap (keymap (83 . center-paragraph)
(115 . foo)).
(accessible-keymaps (current-local-map))
=>(("" keymap
(27 keymap ; Note this keymap for ESC is repeated below.
(83 . center-paragraph)
(115 . center-line))
(9 . tab-to-tab-stop))
("^[" keymap
(83 . center-paragraph)
(115 . foo)))
In the following example, C-h is a prefix key that uses a sparse
keymap starting with (keymap (118 . describe-variable)...).
Another prefix, C-x 4, uses a keymap which is also the value of
the variable ctl-x-4-map. The event mode-line is one of
several dummy events used as prefixes for mouse actions in special parts
of a window.
(accessible-keymaps (current-global-map))
=> (("" keymap [set-mark-command beginning-of-line ...
delete-backward-char])
("^H" keymap (118 . describe-variable) ...
(8 . help-for-help))
("^X" keymap [x-flush-mouse-queue ...
backward-kill-sentence])
("^[" keymap [mark-sexp backward-sexp ...
backward-kill-word])
("^X4" keymap (15 . display-buffer) ...)
([mode-line] keymap
(S-mouse-2 . mouse-split-window-horizontally) ...))
These are not all the keymaps you would see in actuality.
where-is command
(see section `Help' in The GNU Emacs Manual). It returns a list
of key sequences (of any length) that are bound to command in a
set of keymaps.
The argument command can be any object; it is compared with all
keymap entries using eq.
If keymap is nil, then the maps used are the current active
keymaps, disregarding overriding-local-map (that is, pretending
its value is nil). If keymap is non-nil, then the
maps searched are keymap and the global keymap.
Usually it's best to use overriding-local-map as the expression
for keymap. Then where-is-internal searches precisely the
keymaps that are active. To search only the global map, pass
(keymap) (an empty keymap) as keymap.
If firstonly is non-ascii, then the value is a single
string representing the first key sequence found, rather than a list of
all possible key sequences. If firstonly is t, then the
value is the first key sequence, except that key sequences consisting
entirely of ASCII characters (or meta variants of ASCII
characters) are preferred to all other key sequences.
If noindirect is non-nil, where-is-internal doesn't
follow indirect keymap bindings. This makes it possible to search for
an indirect definition itself.
(where-is-internal 'describe-function)
=> ("\^hf" "\^hd")
If prefix is non-nil, it should be a prefix key; then the
listing includes only keys that start with prefix.
The listing describes meta characters as ESC followed by the corresponding non-meta character.
When several characters with consecutive ASCII codes have the
same definition, they are shown together, as
`firstchar..lastchar'. In this instance, you need to
know the ASCII codes to understand which characters this means.
For example, in the default global map, the characters `SPC
.. ~' are described by a single line. SPC is ASCII 32,
~ is ASCII 126, and the characters between them include all
the normal printing characters, (e.g., letters, digits, punctuation,
etc.); all these characters are bound to self-insert-command.
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