(add-hook 'temp-buffer-setup-hook 'help-mode-setup)
(defun help-mode-finish ()
- (when (eq major-mode 'help-mode)
+ (when (eq major-mode 'help-mode)
;; View mode's read-only status of existing *Help* buffer is lost
;; by with-output-to-temp-buffer.
(toggle-read-only 1)
;; Secondly, the buffer has not been displayed yet,
;; so we don't know whether its frame will be selected.
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))
;; Document a minor mode if it is listed in minor-mode-alist,
;; bound locally in this buffer, non-nil, and has a function
;; definition.
- (if (and (symbol-value minor-mode)
+ (if (and (boundp minor-mode)
+ (symbol-value minor-mode)
(fboundp minor-mode))
(let ((pretty-minor-mode minor-mode))
(if (string-match "-mode$" (symbol-name minor-mode))
(defun view-emacs-news (&optional arg)
"Display info on recent changes to Emacs.
-With numeric argument display information on correspondingly older changes."
+With numeric argument, display information on correspondingly older changes."
(interactive "P")
- (let* ((arg (if arg (prefix-numeric-value arg) 0)))
- (find-file-read-only
- (expand-file-name (concat (make-string arg ?O) "NEWS")
- data-directory))))
+ (let* ((arg (if arg (prefix-numeric-value arg) 0))
+ (file (cond ((eq arg 0) "NEWS")
+ ((eq arg 1) "ONEWS")
+ (t
+ (nth (- arg 2)
+ (nreverse (directory-files data-directory
+ nil "^NEWS\\.[0-9]+$"
+ nil)))))))
+ (if file
+ (find-file-read-only (expand-file-name file data-directory))
+ (error "No such old news"))))
(defun view-emacs-FAQ ()
"Display the Emacs Frequently Asked Questions (FAQ) file."
(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."
- (let ((stab (syntax-table)))
- (set-syntax-table emacs-lisp-mode-syntax-table)
- (unwind-protect
- (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)
- (setq obj (read (current-buffer)))
- (and (symbolp obj) (fboundp obj) obj))))
- (error nil)))
- (set-syntax-table stab))))
+ (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)))))
(defvar symbol-file-load-history-loaded nil
"Non-nil means we have loaded the file `fns-VERSION.el' in `exec-directory'.
"Return the bound variable symbol found around point.
Return 0 if there is no such symbol."
(condition-case ()
- (let ((stab (syntax-table)))
- (unwind-protect
- (save-excursion
- (set-syntax-table emacs-lisp-mode-syntax-table)
- (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))))
- (or (and (symbolp obj) (boundp obj) obj)
- 0)))
- (set-syntax-table stab)))
+ (with-syntax-table emacs-lisp-mode-syntax-table
+ (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))))
+ (or (and (symbolp obj) (boundp obj) obj)
+ 0))))
(error 0)))
(defun help-xref-on-pp (from to)
((looking-at "\"") (forward-sexp 1))
((looking-at "#<") (search-forward ">" nil 'move))
((looking-at "\\(\\(\\sw\\|\\s_\\)+\\)")
- (let* ((sym (intern-soft
- (buffer-substring (match-beginning 1)
- (match-end 1))))
+ (let* ((sym (intern-soft (match-string 1)))
(fn (cond ((fboundp sym) #'describe-function)
((or (memq sym '(t nil))
(keywordp sym))
(t (forward-char 1))))))
(set-syntax-table ost))))
-(defun describe-variable (variable)
+(defun describe-variable (variable &optional buffer)
"Display the full documentation of VARIABLE (a symbol).
-Returns the documentation as a string, also."
- (interactive
+Returns the documentation as a string, also.
+If VARIABLE has a buffer-local value in BUFFER (default to the current buffer),
+it is displayed along with the global value."
+ (interactive
(let ((v (variable-at-point))
(enable-recursive-minibuffers t)
val)
(if (symbolp v) (symbol-name v))))
(list (if (equal val "")
v (intern val)))))
- (if (symbolp variable)
- (let (valvoid)
+ (unless (bufferp buffer) (setq buffer (current-buffer)))
+ (if (not (symbolp variable))
+ (message "You did not specify a variable")
+ (let (valvoid)
+ (with-current-buffer buffer
(with-output-to-temp-buffer "*Help*"
(prin1 variable)
(if (not (boundp variable))
(with-current-buffer standard-output
(princ "global value is ")
(terpri)
+ ;; Fixme: pp can take an age if you happen to
+ ;; ask for a very large expression. We should
+ ;; probably print it raw once and check it's a
+ ;; sensible size before prettyprinting. -- fx
(let ((from (point)))
(pp val)
(help-xref-on-pp from (point))))))
(terpri)))
(terpri)
- (save-current-buffer
- (set-buffer standard-output)
+ (with-current-buffer standard-output
(if (> (count-lines (point-min) (point-max)) 10)
(progn
;; Note that setting the syntax table like below
(terpri)
(let ((doc (documentation-property variable 'variable-documentation)))
(princ (or doc "not documented as a variable.")))
- (help-setup-xref (list #'describe-variable variable) (interactive-p))
-
+ (help-setup-xref (list #'describe-variable variable (current-buffer))
+ (interactive-p))
+
;; Make a link to customize if this variable can be customized.
;; Note, it is not reliable to test only for a custom-type property
;; because those are only present after the var's definition
(princ (concat "You can " customize-label " this variable."))
(with-current-buffer "*Help*"
(save-excursion
- (re-search-backward
+ (re-search-backward
(concat "\\(" customize-label "\\)") nil t)
(help-xref-button 1 (lambda (v)
(if help-xref-stack
(save-excursion
(set-buffer standard-output)
;; Return the text we displayed.
- (buffer-string))))
- (message "You did not specify a variable")))
+ (buffer-string)))))))
(defun describe-bindings (&optional prefix buffer)
"Show a list of all defined keys, and their definitions.
The words preceding the quoted symbol can be used in doc strings to
distinguish references to variables, functions and symbols.")
+(defconst help-xref-mule-regexp nil
+ "Regexp matching doc string references to MULE-related keywords.
+
+It is usually nil, and is temporarily bound to an appropriate regexp
+when help commands related to multilingual environment (e.g.,
+`describe-coding-system') are invoked.")
+
+
(defconst help-xref-info-regexp
(purecopy "\\<[Ii]nfo[ \t\n]+node[ \t\n]+`\\([^']+\\)'")
"Regexp matching doc string references to an Info node.")
and the type of reference may be disambiguated by the preceding
word(s) used in `help-xref-symbol-regexp'.
+If the variable `help-xref-mule-regexp' is non-nil, find also
+cross-reference information related to multilingual environment
+\(e.g., coding-systems). This variable is also used to disambiguate
+the type of reference as the same way as `help-xref-symbol-regexp'.
+
A special reference `back' is made to return back through a stack of
help buffers. Variable `help-back-label' specifies the text for
that."
(setq data (concat "(emacs)" data))))
(help-xref-button 1 #'info data
"mouse-2, RET: read this Info node"))))
+ ;; Mule related keywords. Do this before trying
+ ;; `help-xref-symbol-regexp' because some of Mule
+ ;; keywords have variable or function definitions.
+ (if help-xref-mule-regexp
+ (save-excursion
+ (while (re-search-forward help-xref-mule-regexp nil t)
+ (let* ((data (match-string 7))
+ (sym (intern-soft data)))
+ (cond
+ ((match-string 3) ; coding system
+ (and sym (coding-system-p sym)
+ (help-xref-button
+ 7 #'describe-coding-system sym
+ "mouse-2, RET: describe this coding system")))
+ ((match-string 4) ; input method
+ (and (assoc data input-method-alist)
+ (help-xref-button
+ 7 #'describe-input-method data
+ "mouse-2, RET: describe this input method")))
+ ((or (match-string 5) (match-string 6)) ; charset
+ (and sym (charsetp sym)
+ (help-xref-button
+ 7 #'describe-character-set sym
+ "mouse-2, RET: describe this character set")))
+ ((assoc data input-method-alist)
+ (help-xref-button
+ 7 #'describe-input-method data
+ "mouse-2, RET: describe this input method"))
+ ((and sym (coding-system-p sym))
+ (help-xref-button
+ 7 #'describe-coding-system sym
+ "mouse-2, RET: describe this coding system"))
+ ((and sym (charsetp sym))
+ (help-xref-button
+ 7 #'describe-character-set sym
+ "mouse-2, RET: describe this character set")))))))
;; Quoted symbols
(save-excursion
(while (re-search-forward help-xref-symbol-regexp nil t)
(help-xref-button
7 #'describe-face sym)))))))
;; An obvious case of a key substitution:
- (save-excursion
+ (save-excursion
(while (re-search-forward
;; Assume command name is only word characters
;; and dashes to get things like `use M-x foo.'.
(goto-char (point-min))
;; Find a header and the column at which the command
;; name will be found.
- (while (re-search-forward "^key +binding\n\\(-+ +\\)-+\n\n"
+ (while (re-search-forward "^key +binding\n\\(-+ +\\)-+\n\n"
nil t)
(let ((col (- (match-end 1) (match-beginning 1))))
(while
(looking-at "\\(\\sw\\|-\\)+$"))
(let ((sym (intern-soft (match-string 0))))
(if (fboundp sym)
- (help-xref-button
+ (help-xref-button
0 #'describe-function sym
"mouse-2, RET: describe this function"))))
(zerop (forward-line)))))))))
(match-end match-number)
'face help-highlight-face))))
+(defun help-insert-xref-button (string function data &optional help-echo)
+ "Insert STRING and make a hyperlink from cross-reference text on it.
+
+FUNCTION is a function to invoke when the button is activated, applied
+to DATA. DATA may be a single value or a list. See `help-make-xrefs'.
+If optional arg HELP-ECHO is supplied, it is used as a help string."
+ (let ((pos (point)))
+ (insert string)
+ (goto-char pos)
+ (search-forward string)
+ (help-xref-button 0 function data help-echo)))
+
+
\f
;; Additional functions for (re-)creating types of help buffers.
(defun help-xref-interned (symbol)
\f
;;; Automatic resizing of temporary buffers.
-(defcustom temp-buffer-resize-mode nil
- "Non-nil means resize windows displaying temporary buffers.
-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.
-
-Setting this variable directly does not take effect;
-use either \\[customize] or the function `temp-buffer-resize-mode'."
- :get (lambda (symbol)
- (and (memq 'resize-temp-buffer-window temp-buffer-show-hook) t))
- :set (lambda (symbol value)
- (temp-buffer-resize-mode (if value 1 -1)))
- :initialize 'custom-initialize-default
- :type 'boolean
- :group 'help
- :version "20.4")
-
(defcustom temp-buffer-max-height (lambda (buffer) (/ (- (frame-height) 2) 2))
"*Maximum height of a window displaying a temporary buffer.
This is the maximum height (in text lines) which `resize-temp-buffer-window'
:group 'help
:version "20.4")
-(defun temp-buffer-resize-mode (arg)
- "Toggle the mode which that makes windows smaller for temporary buffers.
+(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.
-See the documentation of the variable `temp-buffer-resize-mode' for
-more information."
- (interactive "P")
- (let ((turn-it-on
- (if (null arg)
- (not (memq 'resize-temp-buffer-window temp-buffer-show-hook))
- (> (prefix-numeric-value arg) 0))))
- (if turn-it-on
- (progn
- ;; `help-mode-maybe' may add a `back' button and thus increase the
- ;; text size, so `resize-temp-buffer-window' must be run *after* it.
- (add-hook 'temp-buffer-show-hook 'resize-temp-buffer-window 'append)
- (setq temp-buffer-resize-mode t))
- (remove-hook 'temp-buffer-show-hook 'resize-temp-buffer-window)
- (setq temp-buffer-resize-mode nil))))
+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."
+ nil nil nil :global t :group 'help
+ (if temp-buffer-resize-mode
+ ;; `help-mode-maybe' may add a `back' button and thus increase the
+ ;; text size, so `resize-temp-buffer-window' must be run *after* it.
+ (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.
(unless (or (one-window-p 'nomini)
(not (pos-visible-in-window-p (point-min)))
(/= (frame-width) (window-width)))
- (let* ((max-height (if (functionp temp-buffer-max-height)
- (funcall temp-buffer-max-height (current-buffer))
- temp-buffer-max-height))
- (win-height (1- (window-height)))
- (min-height (1- window-min-height))
- (text-height (count-screen-lines))
- (new-height (max (min text-height max-height) min-height)))
- (enlarge-window (- new-height win-height)))))
+ (fit-window-to-buffer
+ (selected-window)
+ (if (functionp temp-buffer-max-height)
+ (funcall temp-buffer-max-height (current-buffer))
+ temp-buffer-max-height))))
;; `help-manyarg-func-alist' is defined primitively (in doc.c).
;; New primitives with `MANY' or `UNEVALLED' arglists should be added
;; to this alist.
;; The parens and function name are redundant, but it's messy to add
;; them in `documentation'.
+
+;; This will find any missing items:
+;; (let (l)
+;; (mapatoms (lambda (x)
+;; (if (and (fboundp x)
+;; (subrp (symbol-function x))
+;; (not (numberp (cdr (subr-arity (symbol-function x)))))
+;; (not (assq x help-manyarg-func-alist)))
+;; (push x l))))
+;; l)
(defconst help-manyarg-func-alist
(purecopy
'((list . "(list &rest OBJECTS)")
(encode-time
. "(encode-time SECOND MINUTE HOUR DAY MONTH YEAR &optional ZONE)")
(insert . "(insert &rest ARGS)")
+ (insert-and-inherit . "(insert-and-inherit &rest ARGS)")
(insert-before-markers . "(insert-before-markers &rest ARGS)")
(message . "(message STRING &rest ARGUMENTS)")
(message-box . "(message-box STRING &rest ARGUMENTS)")
(track-mouse . "(track-mouse BODY ...)")
(ml-if . "(ml-if COND THEN ELSE...)")
(ml-provide-prefix-argument . "(ml-provide-prefix-argument ARG1 ARG2)")
+ (ml-prefix-argument-loop . "(ml-prefix-argument-loop ...)")
(with-output-to-temp-buffer
. "(with-output-to-temp-buffer BUFFNAME BODY ...)")
- (save-window-excursion . "(save-window-excursion BODY ...)"))))
+ (save-window-excursion . "(save-window-excursion BODY ...)")
+ (find-operation-coding-system
+ . "(find-operation-coding-system OPERATION ARGUMENTS ...)")
+ (insert-before-markers-and-inherit
+ . "(insert-before-markers-and-inherit &rest ARGS)"))))
+
+;; Provide this for the sake of define-minor-mode which generates
+;; defcustoms which require 'help'.
+
+(provide 'help)
;;; help.el ends here
HCoop / bpt / emacs.git / blobdiff