;;; help.el --- help commands for Emacs
-;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002
-;; Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002,
+;; 2003, 2004, 2005 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: help, internal
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
(define-key help-map "q" 'help-quit)
+;; insert-button makes the action nil if it is not store somewhere
+(defvar help-button-cache nil)
+
\f
(defun help-quit ()
"Just exit from the Help command's command loop."
;; So keyboard macro definitions are documented correctly
(fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
-(defalias 'help 'help-for-help)
-(make-help-screen help-for-help
+(defalias 'help 'help-for-help-internal)
+;; find-function can find this.
+(defalias 'help-for-help 'help-for-help-internal)
+;; It can't find this, but nobody will look.
+(make-help-screen help-for-help-internal
"a b c C e f F i I k C-k l L m p 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. Give a substring, and see a list of commands
- (functions interactively callable) that contain
+ (functions that are interactively callable) that contain
that substring. See also the apropos command.
b describe-bindings. Display table of all key bindings.
c describe-key-briefly. Type a command key sequence;
C describe-coding-system. This describes either a specific coding system
(if you type its name) or the coding systems currently in use
(if you type just RET).
-e view-echo-area-messages. Show the `*Messages*' buffer.
-f describe-function. Type a function name and get documentation of it.
+e view-echo-area-messages. Show the buffer where the echo-area messages
+ are stored.
+f describe-function. Type a function name and get its documentation.
F Info-goto-emacs-command-node. Type a function name;
- it takes you to the Info node for that command.
+ it takes you 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.
+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 command key sequence;
- it displays the full documentation.
+ it displays the full documentation for that key sequence.
K Info-goto-emacs-key-command-node. Type a command key sequence;
- it takes you to the Info node for the command bound to that key.
+ it takes you 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. Print documentation of current minor modes,
+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.
s describe-syntax. Display contents of syntax table, plus explanations.
S info-lookup-symbol. Display the definition of a specific symbol
(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."
- (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))
- ;; Move up to surrounding paren, then after the open.
- (backward-up-list 1)
- (forward-char 1)
- ;; If there is space here, this is probably something
- ;; other than a real Lisp function call, so ignore it.
- (if (looking-at "[ \t]")
- (error "Probably not a Lisp function call"))
- (let ((obj (read (current-buffer))))
- (and (symbolp obj) (fboundp obj) obj))))
- (error 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))
+ ;; Move up to surrounding paren, then after the open.
+ (backward-up-list 1)
+ (forward-char 1)
+ ;; If there is space here, this is probably something
+ ;; other than a real Lisp function call, so ignore it.
+ (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)))))))
\f
;;; `User' help functions
(defun view-emacs-news (&optional arg)
"Display info on recent changes to Emacs.
-With numeric argument, display information on correspondingly older changes."
+With argument, display info only for the selected version."
(interactive "P")
- (let* ((arg (if arg (prefix-numeric-value arg) 0))
- (file (cond ((eq arg 0) "NEWS")
- ((eq arg 1) "ONEWS")
- (t
- (nth (- arg 2)
- (nreverse (directory-files data-directory
- nil "^ONEWS\\.[0-9]+$"
- nil)))))))
- (if file
- (view-file (expand-file-name file data-directory))
- (error "No such old news"))))
+ (if (not arg)
+ (view-file (expand-file-name "NEWS" data-directory))
+ (let* ((map (sort
+ (delete-dups
+ (apply
+ 'nconc
+ (mapcar
+ (lambda (file)
+ (with-temp-buffer
+ (insert-file-contents
+ (expand-file-name file data-directory))
+ (let (res)
+ (while (re-search-forward
+ (if (string-match "^ONEWS\\.[0-9]+$" file)
+ "Changes in \\(?:Emacs\\|version\\)?[ \t]*\\([0-9]+\\(?:\\.[0-9]+\\)?\\)"
+ "^\* [^0-9\n]*\\([0-9]+\\.[0-9]+\\)") nil t)
+ (setq res (cons (list (match-string-no-properties 1)
+ file) res)))
+ res)))
+ (append '("NEWS" "ONEWS")
+ (directory-files data-directory nil
+ "^ONEWS\\.[0-9]+$" nil)))))
+ (lambda (a b)
+ (string< (car b) (car a)))))
+ (current (caar map))
+ (version (completing-read
+ (format "Read NEWS for the version (default %s): " current)
+ (mapcar 'car map) nil nil nil nil current))
+ (file (cadr (assoc version map)))
+ res)
+ (if (not file)
+ (error "No news is good news")
+ (view-file (expand-file-name file data-directory))
+ (widen)
+ (goto-char (point-min))
+ (when (re-search-forward
+ (concat (if (string-match "^ONEWS\\.[0-9]+$" file)
+ "Changes in \\(?:Emacs\\|version\\)?[ \t]*"
+ "^\* [^0-9\n]*") version)
+ nil t)
+ (beginning-of-line)
+ (narrow-to-region
+ (point)
+ (save-excursion
+ (while (and (setq res
+ (re-search-forward
+ (if (string-match "^ONEWS\\.[0-9]+$" file)
+ "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."
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)."
+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))
(let ((func (indirect-function definition))
(defs nil)
(standard-output (if insert (current-buffer) t)))
+ ;; In DEFS, find all symbols that are aliases for DEFINITION.
(mapatoms (lambda (symbol)
(and (fboundp symbol)
(not (eq symbol definition))
(indirect-function symbol)
(error symbol)))
(push symbol defs))))
- (princ (mapconcat
- #'(lambda (symbol)
- (let* ((remapped (command-remapping symbol))
- (keys (where-is-internal
- symbol overriding-local-map nil nil remapped))
- (keys (mapconcat 'key-description keys ", ")))
- (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"
- definition symbol keys)
- (format "%s is on %s" symbol keys))
- (format "%s is not on any key" symbol)))))
- (cons definition defs)
- ";\nand ")))
+ ;; Look at all the symbols--first DEFINITION,
+ ;; then its aliases.
+ (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"
+ definition symbol keys)
+ (format "%s is on %s" symbol keys))
+ ;; If this is the command the user asked about,
+ ;; and it is not on any key, say so.
+ ;; For other symbols, its aliases, say nothing
+ ;; about them unless they are on 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 string-key-binding (key)
;; Ok, now look up the key and name the command.
(let ((defn (or (string-key-binding key)
(key-binding key)))
- (key-desc (help-key-description key untranslated)))
+ key-desc)
+ ;; Don't bother user with strings from (e.g.) the select-paste menu.
+ (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)"))
+ ;; Now describe the key, perhaps as changed.
+ (setq key-desc (help-key-description key untranslated))
(if (or (null defn) (integerp defn) (equal defn 'undefined))
(princ (format "%s is undefined" key-desc))
(princ (format (if (windowp window)
key-desc
(if (symbolp defn) defn (prin1-to-string defn)))))))))
-
-(defun describe-key (key &optional untranslated)
+(defun describe-key (key &optional untranslated up-event)
"Display documentation of the function invoked by KEY.
KEY should be a key sequence--when calling from a program,
pass a string or a vector.
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."
- (interactive "kDescribe key: \np")
+ ;; UP-EVENT is the up-event that was discarded by reading KEY, or nil.
+ (interactive "kDescribe key: \np\nU")
(if (numberp untranslated)
(setq untranslated (this-single-command-raw-keys)))
(save-excursion
(if (or (null defn) (integerp defn) (equal defn 'undefined))
(message "%s is undefined" (help-key-description key untranslated))
(help-setup-xref (list #'describe-function defn) (interactive-p))
+ ;; Don't bother user with strings from (e.g.) the select-paste menu.
+ (if (stringp (aref key (1- (length key))))
+ (aset key (1- (length key)) "(any string)"))
+ (if (and untranslated
+ (stringp (aref untranslated (1- (length untranslated)))))
+ (aset untranslated (1- (length untranslated))
+ "(any string)"))
(with-output-to-temp-buffer (help-buffer)
(princ (help-key-description key untranslated))
(if (windowp window)
(prin1 defn)
(princ "\n which is ")
(describe-function-1 defn)
+ (when up-event
+ (let ((ev (aref up-event 0))
+ (descr (key-description up-event))
+ (hdr "\n\n-------------- up event ---------------\n\n")
+ defn
+ mouse-1-tricky mouse-1-remapped)
+ (when (and (consp ev)
+ (eq (car ev) 'mouse-1)
+ (windowp window)
+ mouse-1-click-follows-link
+ (not (eq mouse-1-click-follows-link 'double))
+ (with-current-buffer (window-buffer window)
+ (mouse-on-link-p (posn-point (event-start ev)))))
+ (setq mouse-1-tricky (integerp mouse-1-click-follows-link)
+ mouse-1-remapped (or (not mouse-1-tricky)
+ (> mouse-1-click-follows-link 0)))
+ (if mouse-1-remapped
+ (setcar ev 'mouse-2)))
+ (setq defn (or (string-key-binding up-event) (key-binding up-event)))
+ (unless (or (null defn) (integerp defn) (equal defn 'undefined))
+ (princ (if mouse-1-tricky
+ "\n\n----------------- up-event (short click) ----------------\n\n"
+ hdr))
+ (setq hdr nil)
+ (princ descr)
+ (if (windowp window)
+ (princ " at that spot"))
+ (if mouse-1-remapped
+ (princ " is remapped to <mouse-2>\n which" ))
+ (princ " runs the command ")
+ (prin1 defn)
+ (princ "\n which is ")
+ (describe-function-1 defn))
+ (when mouse-1-tricky
+ (setcar ev
+ (if (> mouse-1-click-follows-link 0) 'mouse-1 'mouse-2))
+ (setq defn (or (string-key-binding up-event) (key-binding up-event)))
+ (unless (or (null defn) (integerp defn) (equal defn 'undefined))
+ (princ (or hdr
+ "\n\n----------------- up-event (long click) ----------------\n\n"))
+ (princ "Pressing ")
+ (princ descr)
+ (if (windowp window)
+ (princ " at that spot"))
+ (princ (format " for longer than %d milli-seconds\n"
+ (abs mouse-1-click-follows-link)))
+ (if (not mouse-1-remapped)
+ (princ " remaps it to <mouse-2> which" ))
+ (princ " runs the command ")
+ (prin1 defn)
+ (princ "\n which is ")
+ (describe-function-1 defn)))))
(print-help-return-message)))))))
\f
variable \(listed in `minor-mode-alist') must also be a function
whose documentation describes the minor mode."
(interactive)
- (help-setup-xref (list #'describe-mode (or buffer (current-buffer)))
+ (unless buffer (setq buffer (current-buffer)))
+ (help-setup-xref (list #'describe-mode buffer)
(interactive-p))
;; For the sake of help-do-xref and help-xref-go-back,
;; don't switch buffers before calling `help-buffer'.
(with-output-to-temp-buffer (help-buffer)
- (save-excursion
- (when buffer (set-buffer buffer))
+ (with-current-buffer buffer
(let (minor-modes)
+ ;; Older packages do not register in minor-mode-list but only in
+ ;; minor-mode-alist.
+ (dolist (x minor-mode-alist)
+ (setq x (car x))
+ (unless (memq x minor-mode-list)
+ (push x minor-mode-list)))
;; Find enabled minor mode we will want to mention.
(dolist (mode minor-mode-list)
;; Document a minor mode if it is listed in minor-mode-alist,
;; non-nil, and has a function definition.
- (and (boundp mode) (symbol-value mode)
- (fboundp mode)
- (let ((pretty-minor-mode mode)
- indicator)
- (if (string-match "\\(-minor\\)?-mode\\'"
- (symbol-name mode))
- (setq pretty-minor-mode
- (capitalize
- (substring (symbol-name mode)
- 0 (match-beginning 0)))))
- (setq indicator (cadr (assq mode minor-mode-alist)))
- (while (and indicator (symbolp indicator)
- (boundp indicator)
- (not (eq indicator (symbol-value indicator))))
- (setq indicator (symbol-value indicator)))
- (push (list pretty-minor-mode mode indicator)
- minor-modes))))
- (if auto-fill-function
- (push '("Auto Fill" auto-fill-mode " Fill")
- minor-modes))
+ (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 (car a) (car b)))))
+ (lambda (a b) (string-lessp (cadr a) (cadr b)))))
(when minor-modes
(princ "Summary of minor modes:\n")
- (dolist (mode minor-modes)
- (let ((pretty-minor-mode (nth 0 mode))
- (indicator (nth 2 mode)))
- (princ (format " %s minor mode (%s):\n"
- pretty-minor-mode
- (if indicator
- (format "indicator%s" indicator)
- "no indicator")))))
+ (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)))
+ (setq indicator (if (zerop (length indicator))
+ "no indicator"
+ (format "indicator%s" indicator)))
+ (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)
+ ;; Document the minor modes fully.
+ (insert pretty-minor-mode)
+ (princ (format " minor mode (%s):\n" indicator))
+ (princ (documentation mode-function)))
+ (princ " ")
+ (insert-button pretty-minor-mode
+ 'action (car help-button-cache)
+ 'follow-link t
+ 'help-echo "mouse-2, RET: show full information")
+ (princ (format " minor mode (%s):\n" indicator)))))
(princ "\n(Full information about these minor modes
follows the description of the major mode.)\n\n"))
;; Document the major mode.
- (princ mode-name)
+ (let ((mode mode-name))
+ (with-current-buffer standard-output
+ (insert mode)
+ (add-text-properties (- (point) (length mode)) (point) '(face bold))))
(princ " mode:\n")
- (princ (documentation major-mode))
- ;; Document the minor modes fully.
- (dolist (mode minor-modes)
- (let ((pretty-minor-mode (nth 0 mode))
- (mode-function (nth 1 mode))
- (indicator (nth 2 mode)))
- (princ "\n\f\n")
- (princ (format "%s minor mode (%s):\n"
- pretty-minor-mode
- (if indicator
- (format "indicator%s" indicator)
- "no indicator")))
- (princ (documentation mode-function)))))
+ (princ (documentation major-mode)))
(print-help-return-message))))
;; defcustoms which require 'help'.
(provide 'help)
-;;; arch-tag: cf427352-27e9-49b7-9a6f-741ebab02423
+;; arch-tag: cf427352-27e9-49b7-9a6f-741ebab02423
;;; help.el ends here