Hooks are variables which contain Lisp functions (or lists of functions)
which are called at various times. Calc defines a number of hooks
that help you to customize it in various ways. Calc uses the Lisp
function run-hooks to invoke the hooks shown below. Several
other customization-related variables are also described here.
Variable: calc-load-hook
This hook is called at the end of `calc.el', after the file has
been loaded, before any functions in it have been called, but after
calc-mode-map and similar variables have been set up.
Variable: calc-ext-load-hook
This hook is called at the end of `calc-ext.el'.
Variable: calc-start-hook
This hook is called as the last step in a M-x calc command. At this point, the Calc buffer has been created and initialized if necessary, the Calc window and trail window have been created, and the "Welcome to Calc" message has been displayed.
Variable: calc-mode-hook
This hook is called when the Calc buffer is being created. Usually
this will only happen once per Emacs session. The hook is called
after Emacs has switched to the new buffer, the mode-settings file
has been read if necessary, and all other buffer-local variables
have been set up. After this hook returns, Calc will perform a
calc-refresh operation, set up the mode line display, then
evaluate any deferred calc-define properties that have not
been evaluated yet.
Variable: calc-trail-mode-hook
This hook is called when the Calc Trail buffer is being created.
It is called as the very last step of setting up the Trail buffer.
Like calc-mode-hook, this will normally happen only once
per Emacs session.
Variable: calc-end-hook
This hook is called by calc-quit, generally because the user
presses q or M-# c while in Calc. The Calc buffer will
be the current buffer. The hook is called as the very first
step, before the Calc window is destroyed.
Variable: calc-window-hook
If this hook exists, it is called to create the Calc window.
Upon return, this new Calc window should be the current window.
(The Calc buffer will already be the current buffer when the
hook is called.) If the hook is not defined, Calc will
generally use split-window, set-window-buffer,
and select-window to create the Calc window.
Variable: calc-trail-window-hook
If this hook exists, it is called to create the Calc Trail window.
The variable calc-trail-buffer will contain the buffer
which the window should use. Unlike calc-window-hook,
this hook must not switch into the new window.
Variable: calc-edit-mode-hook
This hook is called by calc-edit (and the other "edit"
commands) when the temporary editing buffer is being created.
The buffer will have been selected and set up to be in
calc-edit-mode, but will not yet have been filled with
text. (In fact it may still have leftover text from a previous
calc-edit command.)
Variable: calc-mode-save-hook
This hook is called by the calc-save-modes command,
after Calc's own mode features have been inserted into the
`.emacs' buffer and just before the "End of mode settings"
message is inserted.
Variable: calc-reset-hook
This hook is called after M-# 0 (calc-reset) has
reset all modes. The Calc buffer will be the current buffer.
Variable: calc-other-modes
This variable contains a list of strings. The strings are
concatenated at the end of the modes portion of the Calc
mode line (after standard modes such as "Deg", "Inv" and
"Hyp"). Each string should be a short, single word followed
by a space. The variable is nil by default.
Variable: calc-mode-map
This is the keymap that is used by Calc mode. The best time
to adjust it is probably in a calc-mode-hook. If the
Calc extensions package (`calc-ext.el') has not yet been
loaded, many of these keys will be bound to calc-missing-key,
which is a command that loads the extensions package and
"retypes" the key. If your calc-mode-hook rebinds
one of these keys, it will probably be overridden when the
extensions are loaded.
Variable: calc-digit-map
This is the keymap that is used during numeric entry. Numeric
entry uses the minibuffer, but this map binds every non-numeric
key to calcDigit-nondigit which generally calls
exit-minibuffer and "retypes" the key.
Variable: calc-alg-ent-map
This is the keymap that is used during algebraic entry. This is
mostly a copy of minibuffer-local-map.
Variable: calc-store-var-map
This is the keymap that is used during entry of variable names for
commands like calc-store and calc-recall. This is
mostly a copy of minibuffer-local-completion-map.
Variable: calc-edit-mode-map
This is the (sparse) keymap used by calc-edit and other
temporary editing commands. It binds RET, LFD,
and C-c C-c to calc-edit-finish.
Variable: calc-mode-var-list
This is a list of variables which are saved by calc-save-modes.
Each entry is a list of two items, the variable (as a Lisp symbol)
and its default value. When modes are being saved, each variable
is compared with its default value (using equal) and any
non-default variables are written out.
Variable: calc-local-var-list
This is a list of variables which should be buffer-local to the
Calc buffer. Each entry is a variable name (as a Lisp symbol).
These variables also have their default values manipulated by
the calc and calc-quit commands; see section Multiple Calculators.
Since calc-mode-hook is called after this list has been
used the first time, your hook should add a variable to the
list and also call make-local-variable itself.