(eval-when-compile (require 'help-macro))
(add-hook 'temp-buffer-setup-hook 'help-mode-setup)
(add-hook 'temp-buffer-show-hook 'help-mode-finish)
(defvar help-map
(let ((map (make-sparse-keymap)))
(define-key map (char-to-string help-char) 'help-for-help)
(define-key map [help] 'help-for-help)
(define-key map [f1] 'help-for-help)
(define-key map "." 'display-local-help)
(define-key map "?" 'help-for-help)
(define-key map "\C-c" 'describe-copying)
(define-key map "\C-d" 'describe-distribution)
(define-key map "\C-e" 'view-emacs-problems)
(define-key map "\C-f" 'view-emacs-FAQ)
(define-key map "\C-m" 'view-order-manuals)
(define-key map "\C-n" 'view-emacs-news)
(define-key map "\C-p" 'describe-project)
(define-key map "\C-t" 'view-todo)
(define-key map "\C-w" 'describe-no-warranty)
(define-key map "\C-\\" 'describe-input-method)
(define-key map "C" 'describe-coding-system)
(define-key map "F" 'Info-goto-emacs-command-node)
(define-key map "I" 'describe-input-method)
(define-key map "K" 'Info-goto-emacs-key-command-node)
(define-key map "L" 'describe-language-environment)
(define-key map "S" 'info-lookup-symbol)
(define-key map "a" 'apropos-command)
(define-key map "b" 'describe-bindings)
(define-key map "c" 'describe-key-briefly)
(define-key map "d" 'apropos-documentation)
(define-key map "e" 'view-echo-area-messages)
(define-key map "f" 'describe-function)
(define-key map "h" 'view-hello-file)
(define-key map "i" 'info)
(define-key map "4i" 'info-other-window)
(define-key map "k" 'describe-key)
(define-key map "l" 'view-lossage)
(define-key map "m" 'describe-mode)
(define-key map "n" 'view-emacs-news)
(define-key map "p" 'finder-by-keyword)
(define-key map "r" 'info-emacs-manual)
(define-key map "s" 'describe-syntax)
(define-key map "t" 'help-with-tutorial)
(define-key map "w" 'where-is)
(define-key map "v" 'describe-variable)
(define-key map "q" 'help-quit)
map)
"Keymap for characters following the Help key.")
(define-key global-map (char-to-string help-char) 'help-command)
(define-key global-map [help] 'help-command)
(define-key global-map [f1] 'help-command)
(fset 'help-command help-map)
(autoload 'finder-by-keyword "finder"
"Find packages matching a given keyword." t)
(defvar help-button-cache nil)
(defun help-quit ()
"Just exit from the Help command's command loop."
(interactive)
nil)
(defvar help-return-method nil
"What to do to \"exit\" the help buffer.
This is a list
(WINDOW . t) delete the selected window (and possibly its frame,
see `quit-window' and `View-quit'), go to WINDOW.
(WINDOW . quit-window) do quit-window, then select WINDOW.
(WINDOW BUF START POINT) display BUF at START, POINT, then select WINDOW.")
(defun print-help-return-message (&optional function)
"Display or return message saying how to restore windows after help command.
This function assumes that `standard-output' is the help buffer.
It computes a message, and applies the optional argument FUNCTION to it.
If FUNCTION is nil, it applies `message', thus displaying the message.
In addition, this function sets up `help-return-method', which see, that
specifies what to do when the user exits the help buffer."
(and (not (get-buffer-window standard-output))
(let ((first-message
(cond ((or
pop-up-frames
(special-display-p (buffer-name standard-output)))
(setq help-return-method (cons (selected-window) t))
nil)
(display-buffer-reuse-frames
(setq help-return-method (cons (selected-window)
'quit-window))
nil)
((not (one-window-p t))
(setq help-return-method
(cons (selected-window) 'quit-window))
"Type \\[display-buffer] RET to restore the other window.")
(pop-up-windows
(setq help-return-method (cons (selected-window) t))
"Type \\[delete-other-windows] to remove help window.")
(t
(setq help-return-method
(list (selected-window) (window-buffer)
(window-start) (window-point)))
"Type \\[switch-to-buffer] RET to remove help window."))))
(funcall (or function 'message)
(concat
(if first-message
(substitute-command-keys first-message))
(if first-message " ")
(if (or pop-up-windows
(special-display-p (buffer-name standard-output)))
nil
(if (same-window-p (buffer-name standard-output))
(substitute-command-keys
"\\[scroll-up] to scroll the help.")
(substitute-command-keys
"\\[scroll-other-window] to scroll the help."))))))))
(fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
(defalias 'help 'help-for-help-internal)
(defalias 'help-for-help 'help-for-help-internal)
(make-help-screen help-for-help-internal
"a b c C e f F i I k C-k l L m p r s t v w C-c C-d C-f C-n C-p C-t C-w . or ? :"
"You have typed %THIS-KEY%, the help character. Type a Help option:
\(Use SPC or DEL to scroll through this text. Type \\<help-map>\\[help-quit] to exit the Help command.)
a command-apropos. Type a list of words or a regexp; it shows a list of
commands whose names match. See also the apropos command.
b describe-bindings. Display a table of all key bindings.
c describe-key-briefly. Type a key sequence;
it displays the command name run by that key sequence.
C describe-coding-system. Type the name of the coding system to describe,
or just RET to describe the ones currently in use.
d apropos-documentation. Type a pattern (a list of words or a regexp), and
it shows a list of functions, variables, and other items whose
documentation matches that pattern. See also the apropos command.
e view-echo-area-messages. Go to the buffer that logs echo-area messages.
f describe-function. Type a function name and you see its documentation.
F Info-goto-emacs-command-node. Type a command name;
it goes to the on-line manual's section that describes the command.
h Display the HELLO file which illustrates various scripts.
i info. The Info documentation reader: read on-line manuals.
I describe-input-method. Describe a specific input method (if you type
its name) or the current input method (if you type just RET).
k describe-key. Type a key sequence;
it displays the full documentation for that key sequence.
K Info-goto-emacs-key-command-node. Type a key sequence;
it goes to the on-line manual's section that describes
the command bound to that key.
l view-lossage. Show last 100 characters you typed.
L describe-language-environment. This describes either a
specific language environment (if you type its name)
or the current language environment (if you type just RET).
m describe-mode. Display documentation of current minor modes,
and the current major mode, including their special commands.
n view-emacs-news. Display news of recent Emacs changes.
p finder-by-keyword. Find packages matching a given topic keyword.
r info-emacs-manual. Display the Emacs manual in Info mode.
s describe-syntax. Display contents of syntax table, plus explanations.
S info-lookup-symbol. Type a symbol; it goes to that symbol in the
on-line manual for the programming language used in this buffer.
t help-with-tutorial. Select the Emacs learn-by-doing tutorial.
v describe-variable. Type name of a variable;
it displays the variable's documentation and value.
w where-is. Type a command name; it displays which keystrokes
invoke that command.
. display-local-help. Display any available local help at point
in the echo area.
C-c Display Emacs copying permission (GNU General Public License).
C-d Display Emacs ordering information.
C-e Display info about Emacs problems.
C-f Display the Emacs FAQ.
C-m Display how to order printed Emacs manuals.
C-n Display news of recent Emacs changes.
C-p Display information about the GNU project.
C-t Display the Emacs TODO list.
C-w Display information on absence of warranty for GNU Emacs."
help-map)
(defun function-called-at-point ()
"Return a function around point or else called by the list containing point.
If that doesn't give a function, return nil."
(or (with-syntax-table emacs-lisp-mode-syntax-table
(or (condition-case ()
(save-excursion
(or (not (zerop (skip-syntax-backward "_w")))
(eq (char-syntax (following-char)) ?w)
(eq (char-syntax (following-char)) ?_)
(forward-sexp -1))
(skip-chars-forward "'")
(let ((obj (read (current-buffer))))
(and (symbolp obj) (fboundp obj) obj)))
(error nil))
(condition-case ()
(save-excursion
(save-restriction
(narrow-to-region (max (point-min)
(- (point) 1000)) (point-max))
(backward-up-list 1)
(forward-char 1)
(if (looking-at "[ \t]")
(error "Probably not a Lisp function call"))
(let ((obj (read (current-buffer))))
(and (symbolp obj) (fboundp obj) obj))))
(error nil))))
(let* ((str (find-tag-default))
(sym (if str (intern-soft str))))
(if (and sym (fboundp sym))
sym
(save-match-data
(when (and str (string-match "\\`\\W*\\(.*?\\)\\W*\\'" str))
(setq sym (intern-soft (match-string 1 str)))
(and (fboundp sym) sym)))))))
(defun describe-distribution ()
"Display info on how to obtain the latest version of GNU Emacs."
(interactive)
(view-file (expand-file-name "DISTRIB" data-directory)))
(defun describe-copying ()
"Display info on how you may redistribute copies of GNU Emacs."
(interactive)
(view-file (expand-file-name "COPYING" data-directory))
(goto-char (point-min)))
(defun describe-project ()
"Display info on the GNU project."
(interactive)
(view-file (expand-file-name "THE-GNU-PROJECT" data-directory))
(goto-char (point-min)))
(defun describe-no-warranty ()
"Display info on all the kinds of warranty Emacs does NOT have."
(interactive)
(describe-copying)
(let (case-fold-search)
(search-forward "NO WARRANTY")
(recenter 0)))
(defun describe-prefix-bindings ()
"Describe the bindings of the prefix used to reach this command.
The prefix described consists of all but the last event
of the key sequence that ran this command."
(interactive)
(let ((key (this-command-keys)))
(describe-bindings
(if (stringp key)
(substring key 0 (1- (length key)))
(let ((prefix (make-vector (1- (length key)) nil))
(i 0))
(while (< i (length prefix))
(aset prefix i (aref key i))
(setq i (1+ i)))
prefix)))))
(setq prefix-help-command 'describe-prefix-bindings)
(defun view-emacs-news (&optional version)
"Display info on recent changes to Emacs.
With argument, display info only for the selected version."
(interactive "P")
(unless version
(setq version emacs-major-version))
(when (consp version)
(let* ((all-versions
(let (res)
(mapcar
(lambda (file)
(with-temp-buffer
(insert-file-contents
(expand-file-name file data-directory))
(while (re-search-forward
(if (member file '("NEWS.18" "NEWS.1-17"))
"Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
"^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t)
(setq res (cons (match-string-no-properties 1) res)))))
(cons "NEWS"
(directory-files data-directory nil
"^NEWS\\.[0-9][-0-9]*$" nil)))
(sort (delete-dups res) (lambda (a b) (string< b a)))))
(current (car all-versions)))
(setq version (completing-read
(format "Read NEWS for the version (default %s): " current)
all-versions nil nil nil nil current))
(if (integerp (string-to-number version))
(setq version (string-to-number version))
(unless (or (member version all-versions)
(<= (string-to-number version) (string-to-number current)))
(error "No news about version %s" version)))))
(when (integerp version)
(cond ((<= version 12)
(setq version (format "1.%d" version)))
((<= version 18)
(setq version (format "%d" version)))
((> version emacs-major-version)
(error "No news about Emacs %d (yet)" version))))
(let* ((vn (if (stringp version)
(string-to-number version)
version))
(file (cond
((>= vn emacs-major-version) "NEWS")
((< vn 18) "NEWS.1-17")
(t (format "NEWS.%d" vn))))
res)
(view-file (expand-file-name file data-directory))
(widen)
(goto-char (point-min))
(when (stringp version)
(when (re-search-forward
(concat (if (< vn 19)
"Changes in Emacs[ \t]*"
"^\* [^0-9\n]*") version "$")
nil t)
(beginning-of-line)
(narrow-to-region
(point)
(save-excursion
(while (and (setq res
(re-search-forward
(if (< vn 19)
"Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
"^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t))
(equal (match-string-no-properties 1) version)))
(or res (goto-char (point-max)))
(beginning-of-line)
(point)))))))
(defun view-todo (&optional arg)
"Display the Emacs TODO list."
(interactive "P")
(view-file (expand-file-name "TODO" data-directory)))
(defun view-echo-area-messages ()
"View the log of recent echo-area messages: the `*Messages*' buffer.
The number of messages retained in that buffer
is specified by the variable `message-log-max'."
(interactive)
(switch-to-buffer (get-buffer-create "*Messages*")))
(defun view-order-manuals ()
"Display the Emacs ORDERS file."
(interactive)
(view-file (expand-file-name "ORDERS" data-directory))
(goto-address))
(defun view-emacs-FAQ ()
"Display the Emacs Frequently Asked Questions (FAQ) file."
(interactive)
(info "(efaq)"))
(defun view-emacs-problems ()
"Display info on known problems with Emacs and possible workarounds."
(interactive)
(view-file (expand-file-name "PROBLEMS" data-directory)))
(defun view-lossage ()
"Display last 100 input keystrokes.
To record all your input on a file, use `open-dribble-file'."
(interactive)
(help-setup-xref (list #'view-lossage) (interactive-p))
(with-output-to-temp-buffer (help-buffer)
(princ (mapconcat (lambda (key)
(if (or (integerp key) (symbolp key) (listp key))
(single-key-description key)
(prin1-to-string key nil)))
(recent-keys)
" "))
(with-current-buffer standard-output
(goto-char (point-min))
(while (progn (move-to-column 50) (not (eobp)))
(when (search-forward " " nil t)
(delete-char -1))
(insert "\n")))
(print-help-return-message)))
(defun describe-bindings (&optional prefix buffer)
"Show a list of all defined keys, and their definitions.
We put that list in a buffer, and display the buffer.
The optional argument PREFIX, if non-nil, should be a key sequence;
then we display only bindings that start with that prefix.
The optional argument BUFFER specifies which buffer's bindings
to display (default, the current buffer). BUFFER can be a buffer
or a buffer name."
(interactive)
(or buffer (setq buffer (current-buffer)))
(help-setup-xref (list #'describe-bindings prefix buffer) (interactive-p))
(with-current-buffer buffer
(describe-bindings-internal nil prefix)))
(defun describe-bindings-internal (&optional menus prefix)
"Show a list of all defined keys, and their definitions.
We put that list in a buffer, and display the buffer.
The optional argument MENUS, if non-nil, says to mention menu bindings.
\(Ordinarily these are omitted from the output.)
The optional argument PREFIX, if non-nil, should be a key sequence;
then we display only bindings that start with that prefix."
(interactive)
(let ((buf (current-buffer)))
(with-output-to-temp-buffer "*Help*"
(with-current-buffer standard-output
(describe-buffer-bindings buf prefix menus)))))
(defun where-is (definition &optional insert)
"Print message listing key sequences that invoke the command DEFINITION.
Argument is a command definition, usually a symbol with a function definition.
If INSERT (the prefix arg) is non-nil, insert the message in the buffer."
(interactive
(let ((fn (function-called-at-point))
(enable-recursive-minibuffers t)
val)
(setq val (completing-read
(if fn
(format "Where is command (default %s): " fn)
"Where is command: ")
obarray 'commandp t))
(list (if (equal val "") fn (intern val)) current-prefix-arg)))
(unless definition (error "No command"))
(let ((func (indirect-function definition))
(defs nil)
(standard-output (if insert (current-buffer) t)))
(mapatoms (lambda (symbol)
(and (fboundp symbol)
(not (eq symbol definition))
(eq func (condition-case ()
(indirect-function symbol)
(error symbol)))
(push symbol defs))))
(dolist (symbol (cons definition defs))
(let* ((remapped (command-remapping symbol))
(keys (where-is-internal
symbol overriding-local-map nil nil remapped))
(keys (mapconcat 'key-description keys ", "))
string)
(setq string
(if insert
(if (> (length keys) 0)
(if remapped
(format "%s (%s) (remapped from %s)"
keys remapped symbol)
(format "%s (%s)" keys symbol))
(format "M-x %s RET" symbol))
(if (> (length keys) 0)
(if remapped
(format "%s is remapped to %s which is on %s"
symbol remapped keys)
(format "%s is on %s" symbol keys))
(if (eq symbol definition)
(format "%s is not on any key" symbol)))))
(when string
(unless (eq symbol definition)
(princ ";\n its alias "))
(princ string)))))
nil)
(defun help-key-description (key untranslated)
(let ((string (key-description key)))
(if (or (not untranslated)
(and (eq (aref untranslated 0) ?\e) (not (eq (aref key 0) ?\e))))
string
(let ((otherstring (key-description untranslated)))
(if (equal string otherstring)
string
(format "%s (translated from %s)" string otherstring))))))
(defun describe-key-briefly (&optional key insert untranslated)
"Print the name of the function KEY invokes. KEY is a string.
If INSERT (the prefix arg) is non-nil, insert the message in the buffer.
If non-nil, UNTRANSLATED is a vector of the untranslated events.
It can also be a number in which case the untranslated events from
the last key hit are used.
If KEY is a menu item or a tool-bar button that is disabled, this command
temporarily enables it to allow getting help on disabled items and buttons."
(interactive
(let ((enable-disabled-menus-and-buttons t)
(cursor-in-echo-area t)
saved-yank-menu)
(unwind-protect
(let (key)
(when (null (cdr yank-menu))
(setq saved-yank-menu (copy-sequence yank-menu))
(menu-bar-update-yank-menu "(any string)" nil))
(setq key (read-key-sequence "Describe key (or click or menu item): "))
(and (vectorp key)
(let ((last-idx (1- (length key))))
(and (eventp (aref key last-idx))
(memq 'down (event-modifiers (aref key last-idx)))))
(read-event))
(list
key
(if current-prefix-arg (prefix-numeric-value current-prefix-arg))
1))
(when saved-yank-menu
(setq yank-menu (copy-sequence saved-yank-menu))
(fset 'yank-menu (cons 'keymap yank-menu))))))
(if (numberp untranslated)
(setq untranslated (this-single-command-raw-keys)))
(let* ((event (if (and (symbolp (aref key 0))
(> (length key) 1)
(consp (aref key 1)))
(aref key 1)
(aref key 0)))
(modifiers (event-modifiers event))
(standard-output (if insert (current-buffer) t))
(mouse-msg (if (or (memq 'click modifiers) (memq 'down modifiers)
(memq 'drag modifiers)) " at that spot" ""))
(defn (key-binding key t))
key-desc)
(if (and (eq defn nil)
(stringp (aref key (1- (length key))))
(eq (key-binding (substring key 0 -1)) 'yank-menu))
(setq defn 'menu-bar-select-yank))
(if (stringp (aref key (1- (length key))))
(aset key (1- (length key)) "(any string)"))
(if (and (> (length untranslated) 0)
(stringp (aref untranslated (1- (length untranslated)))))
(aset untranslated (1- (length untranslated)) "(any string)"))
(setq key-desc (help-key-description key untranslated))
(if (or (null defn) (integerp defn) (equal defn 'undefined))
(princ (format "%s%s is undefined" key-desc mouse-msg))
(princ (format "%s%s runs the command %S" key-desc mouse-msg defn)))))
(defun describe-key (&optional key untranslated up-event)
"Display documentation of the function invoked by KEY.
KEY can be any kind of a key sequence; it can include keyboard events,
mouse events, and/or menu events. When calling from a program,
pass KEY as a string or a vector.
If non-nil, UNTRANSLATED is a vector of the corresponding untranslated events.
It can also be a number, in which case the untranslated events from
the last key sequence entered are used.
UP-EVENT is the up-event that was discarded by reading KEY, or nil.
If KEY is a menu item or a tool-bar button that is disabled, this command
temporarily enables it to allow getting help on disabled items and buttons."
(interactive
(let ((enable-disabled-menus-and-buttons t)
(cursor-in-echo-area t)
saved-yank-menu)
(unwind-protect
(let (key)
(when (null (cdr yank-menu))
(setq saved-yank-menu (copy-sequence yank-menu))
(menu-bar-update-yank-menu "(any string)" nil))
(setq key (read-key-sequence "Describe key (or click or menu item): "))
(list
key
(prefix-numeric-value current-prefix-arg)
(and (vectorp key)
(let ((last-idx (1- (length key))))
(and (eventp (aref key last-idx))
(memq 'down (event-modifiers (aref key last-idx)))))
(or (and (eventp (aref key 0))
(memq 'down (event-modifiers (aref key 0)))
(= (length key) 1))
(and (> (length key) 1)
(eventp (aref key 1))
(memq 'down (event-modifiers (aref key 1)))))
(read-event))))
(when saved-yank-menu
(setq yank-menu (copy-sequence saved-yank-menu))
(fset 'yank-menu (cons 'keymap yank-menu))))))
(if (numberp untranslated)
(setq untranslated (this-single-command-raw-keys)))
(let* ((event (aref key (if (and (symbolp (aref key 0))
(> (length key) 1)
(consp (aref key 1)))
1
0)))
(modifiers (event-modifiers event))
(mouse-msg (if (or (memq 'click modifiers) (memq 'down modifiers)
(memq 'drag modifiers)) " at that spot" ""))
(defn (key-binding key t))
defn-up defn-up-tricky ev-type
mouse-1-remapped mouse-1-tricky)
(when (and (eq defn nil)
(stringp (aref key (1- (length key))))
(eq (key-binding (substring key 0 -1)) 'yank-menu))
(setq defn 'menu-bar-select-yank))
(if (or (null defn) (integerp defn) (equal defn 'undefined))
(message "%s%s is undefined"
(help-key-description key untranslated) mouse-msg)
(help-setup-xref (list #'describe-function defn) (interactive-p))
(when (stringp (aref key (1- (length key))))
(aset key (1- (length key)) "(any string)"))
(when (and untranslated
(stringp (aref untranslated (1- (length untranslated)))))
(aset untranslated (1- (length untranslated))
"(any string)"))
(when up-event
(setq ev-type (event-basic-type up-event))
(let ((sequence (vector up-event)))
(when (and (eq ev-type 'mouse-1)
mouse-1-click-follows-link
(not (eq mouse-1-click-follows-link 'double))
(setq mouse-1-remapped
(mouse-on-link-p (event-start up-event))))
(setq mouse-1-tricky (and (integerp mouse-1-click-follows-link)
(> mouse-1-click-follows-link 0)))
(cond ((stringp mouse-1-remapped)
(setq sequence mouse-1-remapped))
((vectorp mouse-1-remapped)
(setcar up-event (elt mouse-1-remapped 0)))
(t (setcar up-event 'mouse-2))))
(setq defn-up (key-binding sequence nil nil (event-start up-event)))
(when mouse-1-tricky
(setq sequence (vector up-event))
(aset sequence 0 'mouse-1)
(setq defn-up-tricky (key-binding sequence nil nil (event-start up-event))))))
(with-output-to-temp-buffer (help-buffer)
(princ (help-key-description key untranslated))
(princ (format "\
%s runs the command %S
which is "
mouse-msg defn))
(describe-function-1 defn)
(when up-event
(unless (or (null defn-up)
(integerp defn-up)
(equal defn-up 'undefined))
(princ (format "
----------------- up-event %s----------------
<%S>%s%s runs the command %S
which is "
(if mouse-1-tricky "(short click) " "")
ev-type mouse-msg
(if mouse-1-remapped
" is remapped to <mouse-2>\nwhich" "")
defn-up))
(describe-function-1 defn-up))
(unless (or (null defn-up-tricky)
(integerp defn-up-tricky)
(eq defn-up-tricky 'undefined))
(princ (format "
----------------- up-event (long click) ----------------
Pressing <%S>%s for longer than %d milli-seconds
runs the command %S
which is "
ev-type mouse-msg
mouse-1-click-follows-link
defn-up-tricky))
(describe-function-1 defn-up-tricky)))
(print-help-return-message)))))
(defun describe-mode (&optional buffer)
"Display documentation of current major mode and minor modes.
A brief summary of the minor modes comes first, followed by the
major mode description. This is followed by detailed
descriptions of the minor modes, each on a separate page.
For this to work correctly for a minor mode, the mode's indicator
variable \(listed in `minor-mode-alist') must also be a function
whose documentation describes the minor mode."
(interactive "@")
(unless buffer (setq buffer (current-buffer)))
(help-setup-xref (list #'describe-mode buffer)
(interactive-p))
(with-output-to-temp-buffer (help-buffer)
(with-current-buffer buffer
(let (minor-modes)
(dolist (x minor-mode-alist)
(setq x (car x))
(unless (memq x minor-mode-list)
(push x minor-mode-list)))
(dolist (mode minor-mode-list)
(let ((fmode (or (get mode :minor-mode-function) mode)))
(and (boundp mode) (symbol-value mode)
(fboundp fmode)
(let ((pretty-minor-mode
(if (string-match "\\(\\(-minor\\)?-mode\\)?\\'"
(symbol-name fmode))
(capitalize
(substring (symbol-name fmode)
0 (match-beginning 0)))
fmode)))
(push (list fmode pretty-minor-mode
(format-mode-line (assq mode minor-mode-alist)))
minor-modes)))))
(setq minor-modes
(sort minor-modes
(lambda (a b) (string-lessp (cadr a) (cadr b)))))
(when minor-modes
(princ "Enabled minor modes:\n")
(make-local-variable 'help-button-cache)
(with-current-buffer standard-output
(dolist (mode minor-modes)
(let ((mode-function (nth 0 mode))
(pretty-minor-mode (nth 1 mode))
(indicator (nth 2 mode)))
(add-text-properties 0 (length pretty-minor-mode)
'(face bold) pretty-minor-mode)
(save-excursion
(goto-char (point-max))
(princ "\n\f\n")
(push (point-marker) help-button-cache)
(insert pretty-minor-mode)
(princ (format " minor mode (%s):\n"
(if (zerop (length indicator))
"no indicator"
(format "indicator%s"
indicator))))
(princ (documentation mode-function)))
(insert-button pretty-minor-mode
'action (car help-button-cache)
'follow-link t
'help-echo "mouse-2, RET: show full information")
(newline)))
(forward-line -1)
(fill-paragraph nil)
(forward-line 1))
(princ "\n(Information about these minor modes follows the major mode info.)\n\n"))
(let ((mode mode-name))
(with-current-buffer standard-output
(let ((start (point)))
(insert (format-mode-line mode))
(add-text-properties start (point) '(face bold)))))
(princ " mode:\n")
(princ (documentation major-mode)))
(print-help-return-message))))
(defun describe-minor-mode (minor-mode)
"Display documentation of a minor mode given as MINOR-MODE.
MINOR-MODE can be a minor mode symbol or a minor mode indicator string
appeared on the mode-line."
(interactive (list (completing-read
"Minor mode: "
(nconc
(describe-minor-mode-completion-table-for-symbol)
(describe-minor-mode-completion-table-for-indicator)
))))
(if (symbolp minor-mode)
(setq minor-mode (symbol-name minor-mode)))
(let ((symbols (describe-minor-mode-completion-table-for-symbol))
(indicators (describe-minor-mode-completion-table-for-indicator)))
(cond
((member minor-mode symbols)
(describe-minor-mode-from-symbol (intern minor-mode)))
((member minor-mode indicators)
(describe-minor-mode-from-indicator minor-mode))
(t
(error "No such minor mode: %s" minor-mode)))))
(defun describe-minor-mode-completion-table-for-symbol ()
(delq nil (mapcar 'symbol-name minor-mode-list)))
(defun describe-minor-mode-from-symbol (symbol)
"Display documentation of a minor mode given as a symbol, SYMBOL"
(interactive (list (intern (completing-read
"Minor mode symbol: "
(describe-minor-mode-completion-table-for-symbol)))))
(if (fboundp symbol)
(describe-function symbol)
(describe-variable symbol)))
(defun describe-minor-mode-completion-table-for-indicator ()
(delq nil
(mapcar (lambda (x)
(let ((i (format-mode-line x)))
(cond
((= 0 (length i))
nil)
((eq (aref i 0) ?\s)
(substring i 1))
(t
i))))
minor-mode-alist)))
(defun describe-minor-mode-from-indicator (indicator)
"Display documentation of a minor mode specified by INDICATOR.
If you call this function interactively, you can give indicator which
is currently activated with completion."
(interactive (list
(completing-read
"Minor mode indicator: "
(describe-minor-mode-completion-table-for-indicator))))
(let ((minor-mode (lookup-minor-mode-from-indicator indicator)))
(if minor-mode
(describe-minor-mode-from-symbol minor-mode)
(error "Cannot find minor mode for `%s'" indicator))))
(defun lookup-minor-mode-from-indicator (indicator)
"Return a minor mode symbol from its indicator on the modeline."
(if (and (< 0 (length indicator))
(eq (aref indicator 0) ?\s))
(setq indicator (substring indicator 1)))
(let ((minor-modes minor-mode-alist)
result)
(while minor-modes
(let* ((minor-mode (car (car minor-modes)))
(anindicator (format-mode-line
(car (cdr (car minor-modes))))))
(if (and (stringp anindicator)
(> (length anindicator) 0)
(eq (aref anindicator 0) ?\s))
(setq anindicator (substring anindicator 1)))
(if (equal indicator anindicator)
(setq result minor-mode
minor-modes nil)
(setq minor-modes (cdr minor-modes)))))
result))
(defcustom temp-buffer-max-height (lambda (buffer) (/ (- (frame-height) 2) 2))
"Maximum height of a window displaying a temporary buffer.
This is effective only when Temp Buffer Resize mode is enabled.
The value is the maximum height (in lines) which `resize-temp-buffer-window'
will give to a window displaying a temporary buffer.
It can also be a function to be called to choose the height for such a buffer.
It gets one argumemt, the buffer, and should return a positive integer."
:type '(choice integer function)
:group 'help
:version "20.4")
(define-minor-mode temp-buffer-resize-mode
"Toggle the mode which makes windows smaller for temporary buffers.
With prefix argument ARG, turn the resizing of windows displaying temporary
buffers on if ARG is positive or off otherwise.
This makes the window the right height for its contents, but never
more than `temp-buffer-max-height' nor less than `window-min-height'.
This applies to `help', `apropos' and `completion' buffers, and some others."
:global t :group 'help
(if temp-buffer-resize-mode
(add-hook 'temp-buffer-show-hook 'resize-temp-buffer-window 'append)
(remove-hook 'temp-buffer-show-hook 'resize-temp-buffer-window)))
(defun resize-temp-buffer-window ()
"Resize the current window to fit its contents.
Will not make it higher than `temp-buffer-max-height' nor smaller than
`window-min-height'. Do nothing if it is the only window on its frame, if it
is not as wide as the frame or if some of the window's contents are scrolled
out of view."
(unless (or (one-window-p 'nomini)
(not (pos-visible-in-window-p (point-min)))
(/= (frame-width) (window-width)))
(fit-window-to-buffer
(selected-window)
(if (functionp temp-buffer-max-height)
(funcall temp-buffer-max-height (current-buffer))
temp-buffer-max-height))))
(provide 'help)