--- /dev/null
+;;; help-funs.el --- Complex help functions
+
+;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001
+;; Free Software Foundation, Inc.
+
+;; Maintainer: FSF
+;; Keywords: help, internal
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; 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.
+
+;;; Commentary:
+
+;; This file contains those help commands which are complicated, and
+;; which may not be used in every session. For example
+;; `describe-function' will probably be heavily used when doing elisp
+;; programming, but not if just editing C files. Simpler help commands
+;; are in help.el
+
+;;; Code:
+
+(require 'help-mode)
+
+
+;;;###autoload
+(defun help-with-tutorial (&optional arg)
+ "Select the Emacs learn-by-doing tutorial.
+If there is a tutorial version written in the language
+of the selected language environment, that version is used.
+If there's no tutorial in that language, `TUTORIAL' is selected.
+With arg, you are asked to choose which language."
+ (interactive "P")
+ (let ((lang (if arg
+ (read-language-name 'tutorial "Language: " "English")
+ (if (get-language-info current-language-environment 'tutorial)
+ current-language-environment
+ "English")))
+ file filename)
+ (setq filename (get-language-info lang 'tutorial))
+ (setq file (expand-file-name (concat "~/" filename)))
+ (delete-other-windows)
+ (if (get-file-buffer file)
+ (switch-to-buffer (get-file-buffer file))
+ (switch-to-buffer (create-file-buffer file))
+ (setq buffer-file-name file)
+ (setq default-directory (expand-file-name "~/"))
+ (setq buffer-auto-save-file-name nil)
+ (insert-file-contents (expand-file-name filename data-directory))
+ (goto-char (point-min))
+ (search-forward "\n<<")
+ (beginning-of-line)
+ (delete-region (point) (progn (end-of-line) (point)))
+ (let ((n (- (window-height (selected-window))
+ (count-lines (point-min) (point))
+ 6)))
+ (if (< n 12)
+ (newline n)
+ ;; Some people get confused by the large gap.
+ (newline (/ n 2))
+ (insert "[Middle of page left blank for didactic purposes. "
+ "Text continues below]")
+ (newline (- n (/ n 2)))))
+ (goto-char (point-min))
+ (set-buffer-modified-p nil))))
+
+;;;###autoload
+(defun locate-library (library &optional nosuffix path interactive-call)
+ "Show the precise file name of Emacs library LIBRARY.
+This command searches the directories in `load-path' like `M-x load-library'
+to find the file that `M-x load-library RET LIBRARY RET' would load.
+Optional second arg NOSUFFIX non-nil means don't add suffixes `load-suffixes'
+to the specified name LIBRARY.
+
+If the optional third arg PATH is specified, that list of directories
+is used instead of `load-path'.
+
+When called from a program, the file name is normaly returned as a
+string. When run interactively, the argument INTERACTIVE-CALL is t,
+and the file name is displayed in the echo area."
+ (interactive (list (read-string "Locate library: ")
+ nil nil
+ t))
+ (catch 'answer
+ (dolist (dir (or path load-path))
+ (dolist (suf (append (unless nosuffix load-suffixes) '("")))
+ (let ((try (expand-file-name (concat library suf) dir)))
+ (and (file-readable-p try)
+ (null (file-directory-p try))
+ (progn
+ (if interactive-call
+ (message "Library is file %s" (abbreviate-file-name try)))
+ (throw 'answer try))))))
+ (if interactive-call
+ (message "No library %s in search path" library))
+ nil))
+
+\f
+;; Functions
+
+;;;###autoload
+(defun describe-function (function)
+ "Display the full documentation of FUNCTION (a symbol)."
+ (interactive
+ (let ((fn (function-called-at-point))
+ (enable-recursive-minibuffers t)
+ val)
+ (setq val (completing-read (if fn
+ (format "Describe function (default %s): " fn)
+ "Describe function: ")
+ obarray 'fboundp t nil nil (symbol-name fn)))
+ (list (if (equal val "")
+ fn (intern val)))))
+ (if (null function)
+ (message "You didn't specify a function")
+ (help-setup-xref (list #'describe-function function) (interactive-p))
+ (with-output-to-temp-buffer (help-buffer)
+ (prin1 function)
+ ;; Use " is " instead of a colon so that
+ ;; it is easier to get out the function name using forward-sexp.
+ (princ " is ")
+ (describe-function-1 function)
+ (print-help-return-message)
+ (with-current-buffer standard-output
+ ;; Return the text we displayed.
+ (buffer-string)))))
+
+;;;###autoload
+(defun describe-function-1 (function)
+ (let* ((def (if (symbolp function)
+ (symbol-function function)
+ function))
+ file-name string
+ (beg (if (commandp def) "an interactive " "a ")))
+ (setq string
+ (cond ((or (stringp def)
+ (vectorp def))
+ "a keyboard macro")
+ ((subrp def)
+ (if (eq 'unevalled (cdr (subr-arity def)))
+ (concat beg "special form")
+ (concat beg "built-in function")))
+ ((byte-code-function-p def)
+ (concat beg "compiled Lisp function"))
+ ((symbolp def)
+ (while (symbolp (symbol-function def))
+ (setq def (symbol-function def)))
+ (format "an alias for `%s'" def))
+ ((eq (car-safe def) 'lambda)
+ (concat beg "Lisp function"))
+ ((eq (car-safe def) 'macro)
+ "a Lisp macro")
+ ((eq (car-safe def) 'mocklisp)
+ "a mocklisp function")
+ ((eq (car-safe def) 'autoload)
+ (setq file-name (nth 1 def))
+ (format "%s autoloaded %s"
+ (if (commandp def) "an interactive" "an")
+ (if (eq (nth 4 def) 'keymap) "keymap"
+ (if (nth 4 def) "Lisp macro" "Lisp function"))
+ ))
+ ;; perhaps use keymapp here instead
+ ((eq (car-safe def) 'keymap)
+ (let ((is-full nil)
+ (elts (cdr-safe def)))
+ (while elts
+ (if (char-table-p (car-safe elts))
+ (setq is-full t
+ elts nil))
+ (setq elts (cdr-safe elts)))
+ (if is-full
+ "a full keymap"
+ "a sparse keymap")))
+ (t "")))
+ (princ string)
+ (with-current-buffer standard-output
+ (save-excursion
+ (save-match-data
+ (if (re-search-backward "alias for `\\([^`']+\\)'" nil t)
+ (help-xref-button 1 'help-function def)))))
+ (or file-name
+ (setq file-name (symbol-file function)))
+ (cond
+ (file-name
+ (princ " in `")
+ ;; We used to add .el to the file name,
+ ;; but that's completely wrong when the user used load-file.
+ (princ file-name)
+ (princ "'")
+ ;; Make a hyperlink to the library.
+ (with-current-buffer standard-output
+ (save-excursion
+ (re-search-backward "`\\([^`']+\\)'" nil t)
+ (help-xref-button 1 'help-function-def function file-name)))))
+ (princ ".")
+ (terpri)
+ (when (commandp function)
+ (let ((keys (where-is-internal
+ function overriding-local-map nil nil)))
+ (when keys
+ (princ "It is bound to ")
+ ;; FIXME: This list can be very long (f.ex. for self-insert-command).
+ (princ (mapconcat 'key-description keys ", "))
+ (princ ".")
+ (terpri))))
+ ;; Handle symbols aliased to other symbols.
+ (setq def (indirect-function def))
+ ;; If definition is a macro, find the function inside it.
+ (if (eq (car-safe def) 'macro)
+ (setq def (cdr def)))
+ (let ((arglist (cond ((byte-code-function-p def)
+ (car (append def nil)))
+ ((eq (car-safe def) 'lambda)
+ (nth 1 def))
+ ((and (eq (car-safe def) 'autoload)
+ (not (eq (nth 4 def) 'keymap)))
+ (concat "[Arg list not available until "
+ "function definition is loaded.]"))
+ (t t))))
+ (cond ((listp arglist)
+ (princ (cons (if (symbolp function) function "anonymous")
+ (mapcar (lambda (arg)
+ (if (memq arg '(&optional &rest))
+ arg
+ (intern (upcase (symbol-name arg)))))
+ arglist)))
+ (terpri))
+ ((stringp arglist)
+ (princ arglist)
+ (terpri))))
+ (let ((doc (documentation function)))
+ (if doc
+ (progn (terpri)
+ (princ doc)
+ (if (subrp def)
+ (with-current-buffer standard-output
+ (beginning-of-line)
+ ;; Builtins get the calling sequence at the end of
+ ;; the doc string. Move it to the same place as
+ ;; for other functions.
+
+ ;; In cases where `function' has been fset to a
+ ;; subr we can't search for function's name in
+ ;; the doc string. Kluge round that using the
+ ;; printed representation. The arg list then
+ ;; shows the wrong function name, but that
+ ;; might be a useful hint.
+ (let* ((rep (prin1-to-string def))
+ (name (progn
+ (string-match " \\([^ ]+\\)>$" rep)
+ (match-string 1 rep))))
+ (if (looking-at (format "(%s[ )]" (regexp-quote name)))
+ (let ((start (point-marker)))
+ (goto-char (point-min))
+ (forward-paragraph)
+ (insert-buffer-substring (current-buffer) start)
+ (insert ?\n)
+ (delete-region (1- start) (point-max)))
+ (goto-char (point-min))
+ (forward-paragraph)
+ (insert
+ "[Missing arglist. Please make a bug report.]\n")))
+ (goto-char (point-max)))))
+ (princ "not documented")))))
+
+\f
+;; Variables
+
+;;;###autoload
+(defun variable-at-point ()
+ "Return the bound variable symbol found around point.
+Return 0 if there is no such symbol."
+ (condition-case ()
+ (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)))
+
+;;;###autoload
+(defun describe-variable (variable &optional buffer)
+ "Display the full documentation of VARIABLE (a symbol).
+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)
+ (setq val (completing-read (if (symbolp v)
+ (format
+ "Describe variable (default %s): " v)
+ "Describe variable: ")
+ obarray 'boundp t nil nil
+ (if (symbolp v) (symbol-name v))))
+ (list (if (equal val "")
+ v (intern val)))))
+ (unless (bufferp buffer) (setq buffer (current-buffer)))
+ (if (not (symbolp variable))
+ (message "You did not specify a variable")
+ (let (valvoid)
+ (help-setup-xref (list #'describe-variable variable buffer)
+ (interactive-p))
+ (with-output-to-temp-buffer (help-buffer)
+ (with-current-buffer buffer
+ (prin1 variable)
+ (if (not (boundp variable))
+ (progn
+ (princ " is void")
+ (setq valvoid t))
+ (let ((val (symbol-value variable)))
+ (with-current-buffer standard-output
+ (princ "'s value is ")
+ (terpri)
+ (let ((from (point)))
+ (pp val)
+ (help-xref-on-pp from (point))
+ (if (< (point) (+ from 20))
+ (save-excursion
+ (goto-char from)
+ (delete-char -1)))))))
+ (terpri)
+ (when (local-variable-p variable)
+ (princ (format "Local in buffer %s; " (buffer-name)))
+ (if (not (default-boundp variable))
+ (princ "globally void")
+ (let ((val (default-value 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))
+ (if (< (point) (+ from 20))
+ (save-excursion
+ (goto-char from)
+ (delete-char -1)))))))
+ (terpri))
+ (terpri)
+ (with-current-buffer standard-output
+ (when (> (count-lines (point-min) (point-max)) 10)
+ ;; Note that setting the syntax table like below
+ ;; makes forward-sexp move over a `'s' at the end
+ ;; of a symbol.
+ (set-syntax-table emacs-lisp-mode-syntax-table)
+ (goto-char (point-min))
+ (if valvoid
+ (forward-line 1)
+ (forward-sexp 1)
+ (delete-region (point) (progn (end-of-line) (point)))
+ (insert " value is shown below.\n\n")
+ (save-excursion
+ (insert "\n\nValue:"))))
+ ;; Add a note for variables that have been make-var-buffer-local.
+ (when (and (local-variable-if-set-p variable)
+ (or (not (local-variable-p variable))
+ (with-temp-buffer
+ (local-variable-if-set-p variable))))
+ (save-excursion
+ (forward-line -1)
+ (insert "Automatically becomes buffer-local when set in any fashion.\n"))))
+ (princ "Documentation:")
+ (terpri)
+ (let ((doc (documentation-property variable 'variable-documentation)))
+ (princ (or doc "not documented as a variable.")))
+
+ ;; 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
+ ;; has been loaded.
+ (if (or (get variable 'custom-type) ; after defcustom
+ (get variable 'custom-loads) ; from loaddefs.el
+ (get variable 'standard-value)) ; from cus-start.el
+ (let ((customize-label "customize"))
+ (terpri)
+ (terpri)
+ (princ (concat "You can " customize-label " this variable."))
+ (with-current-buffer standard-output
+ (save-excursion
+ (re-search-backward
+ (concat "\\(" customize-label "\\)") nil t)
+ (help-xref-button 1 'help-customize-variable variable)))))
+ ;; Make a hyperlink to the library if appropriate. (Don't
+ ;; change the format of the buffer's initial line in case
+ ;; anything expects the current format.)
+ (let ((file-name (symbol-file variable)))
+ (when (equal file-name "loaddefs.el")
+ ;; Find the real def site of the preloaded variable.
+ (let ((location
+ (condition-case nil
+ (find-variable-noselect variable file-name)
+ (error nil))))
+ (when location
+ (with-current-buffer (car location)
+ (goto-char (cdr location))
+ (when (re-search-backward
+ "^;;; Generated autoloads from \\(.*\\)" nil t)
+ (setq file-name (match-string 1)))))))
+ (when file-name
+ (princ "\n\nDefined in `")
+ (princ file-name)
+ (princ "'.")
+ (with-current-buffer standard-output
+ (save-excursion
+ (re-search-backward "`\\([^`']+\\)'" nil t)
+ (help-xref-button 1 'help-variable-def
+ variable file-name)))))
+
+ (print-help-return-message)
+ (save-excursion
+ (set-buffer standard-output)
+ ;; Return the text we displayed.
+ (buffer-string)))))))
+
+
+;;;###autoload
+(defun describe-syntax (&optional buffer)
+ "Describe the syntax specifications in the syntax table of BUFFER.
+The descriptions are inserted in a help buffer, which is then displayed.
+BUFFER defaults to the current buffer."
+ (interactive)
+ (setq buffer (or buffer (current-buffer)))
+ (help-setup-xref (list #'describe-syntax buffer) (interactive-p))
+ (with-output-to-temp-buffer (help-buffer)
+ (let ((table (with-current-buffer buffer (syntax-table))))
+ (with-current-buffer standard-output
+ (describe-vector table 'internal-describe-syntax-value)
+ (while (setq table (char-table-parent table))
+ (insert "\nThe parent syntax table is:")
+ (describe-vector table 'internal-describe-syntax-value))))))
+
+(provide 'help-funs)
+
+;;; help-funs.el ends here
+++ /dev/null
-;;; help-funs.el --- Complex help functions
-
-;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001
-;; Free Software Foundation, Inc.
-
-;; Maintainer: FSF
-;; Keywords: help, internal
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;; GNU General Public License for more details.
-
-;; 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.
-
-;;; Commentary:
-
-;; This file contains those help commands which are complicated, and
-;; which may not be used in every session. For example
-;; `describe-function' will probably be heavily used when doing elisp
-;; programming, but not if just editing C files. Simpler help commands
-;; are in help.el
-
-;;; Code:
-
-(require 'help-mode)
-
-
-;;;###autoload
-(defun help-with-tutorial (&optional arg)
- "Select the Emacs learn-by-doing tutorial.
-If there is a tutorial version written in the language
-of the selected language environment, that version is used.
-If there's no tutorial in that language, `TUTORIAL' is selected.
-With arg, you are asked to choose which language."
- (interactive "P")
- (let ((lang (if arg
- (read-language-name 'tutorial "Language: " "English")
- (if (get-language-info current-language-environment 'tutorial)
- current-language-environment
- "English")))
- file filename)
- (setq filename (get-language-info lang 'tutorial))
- (setq file (expand-file-name (concat "~/" filename)))
- (delete-other-windows)
- (if (get-file-buffer file)
- (switch-to-buffer (get-file-buffer file))
- (switch-to-buffer (create-file-buffer file))
- (setq buffer-file-name file)
- (setq default-directory (expand-file-name "~/"))
- (setq buffer-auto-save-file-name nil)
- (insert-file-contents (expand-file-name filename data-directory))
- (goto-char (point-min))
- (search-forward "\n<<")
- (beginning-of-line)
- (delete-region (point) (progn (end-of-line) (point)))
- (let ((n (- (window-height (selected-window))
- (count-lines (point-min) (point))
- 6)))
- (if (< n 12)
- (newline n)
- ;; Some people get confused by the large gap.
- (newline (/ n 2))
- (insert "[Middle of page left blank for didactic purposes. "
- "Text continues below]")
- (newline (- n (/ n 2)))))
- (goto-char (point-min))
- (set-buffer-modified-p nil))))
-
-;;;###autoload
-(defun locate-library (library &optional nosuffix path interactive-call)
- "Show the precise file name of Emacs library LIBRARY.
-This command searches the directories in `load-path' like `M-x load-library'
-to find the file that `M-x load-library RET LIBRARY RET' would load.
-Optional second arg NOSUFFIX non-nil means don't add suffixes `load-suffixes'
-to the specified name LIBRARY.
-
-If the optional third arg PATH is specified, that list of directories
-is used instead of `load-path'.
-
-When called from a program, the file name is normaly returned as a
-string. When run interactively, the argument INTERACTIVE-CALL is t,
-and the file name is displayed in the echo area."
- (interactive (list (read-string "Locate library: ")
- nil nil
- t))
- (catch 'answer
- (dolist (dir (or path load-path))
- (dolist (suf (append (unless nosuffix load-suffixes) '("")))
- (let ((try (expand-file-name (concat library suf) dir)))
- (and (file-readable-p try)
- (null (file-directory-p try))
- (progn
- (if interactive-call
- (message "Library is file %s" (abbreviate-file-name try)))
- (throw 'answer try))))))
- (if interactive-call
- (message "No library %s in search path" library))
- nil))
-
-\f
-;; Functions
-
-;;;###autoload
-(defun describe-function (function)
- "Display the full documentation of FUNCTION (a symbol)."
- (interactive
- (let ((fn (function-called-at-point))
- (enable-recursive-minibuffers t)
- val)
- (setq val (completing-read (if fn
- (format "Describe function (default %s): " fn)
- "Describe function: ")
- obarray 'fboundp t nil nil (symbol-name fn)))
- (list (if (equal val "")
- fn (intern val)))))
- (if (null function)
- (message "You didn't specify a function")
- (help-setup-xref (list #'describe-function function) (interactive-p))
- (with-output-to-temp-buffer (help-buffer)
- (prin1 function)
- ;; Use " is " instead of a colon so that
- ;; it is easier to get out the function name using forward-sexp.
- (princ " is ")
- (describe-function-1 function)
- (print-help-return-message)
- (with-current-buffer standard-output
- ;; Return the text we displayed.
- (buffer-string)))))
-
-;;;###autoload
-(defun describe-function-1 (function)
- (let* ((def (if (symbolp function)
- (symbol-function function)
- function))
- file-name string
- (beg (if (commandp def) "an interactive " "a ")))
- (setq string
- (cond ((or (stringp def)
- (vectorp def))
- "a keyboard macro")
- ((subrp def)
- (if (eq 'unevalled (cdr (subr-arity def)))
- (concat beg "special form")
- (concat beg "built-in function")))
- ((byte-code-function-p def)
- (concat beg "compiled Lisp function"))
- ((symbolp def)
- (while (symbolp (symbol-function def))
- (setq def (symbol-function def)))
- (format "an alias for `%s'" def))
- ((eq (car-safe def) 'lambda)
- (concat beg "Lisp function"))
- ((eq (car-safe def) 'macro)
- "a Lisp macro")
- ((eq (car-safe def) 'mocklisp)
- "a mocklisp function")
- ((eq (car-safe def) 'autoload)
- (setq file-name (nth 1 def))
- (format "%s autoloaded %s"
- (if (commandp def) "an interactive" "an")
- (if (eq (nth 4 def) 'keymap) "keymap"
- (if (nth 4 def) "Lisp macro" "Lisp function"))
- ))
- ;; perhaps use keymapp here instead
- ((eq (car-safe def) 'keymap)
- (let ((is-full nil)
- (elts (cdr-safe def)))
- (while elts
- (if (char-table-p (car-safe elts))
- (setq is-full t
- elts nil))
- (setq elts (cdr-safe elts)))
- (if is-full
- "a full keymap"
- "a sparse keymap")))
- (t "")))
- (princ string)
- (with-current-buffer standard-output
- (save-excursion
- (save-match-data
- (if (re-search-backward "alias for `\\([^`']+\\)'" nil t)
- (help-xref-button 1 'help-function def)))))
- (or file-name
- (setq file-name (symbol-file function)))
- (cond
- (file-name
- (princ " in `")
- ;; We used to add .el to the file name,
- ;; but that's completely wrong when the user used load-file.
- (princ file-name)
- (princ "'")
- ;; Make a hyperlink to the library.
- (with-current-buffer standard-output
- (save-excursion
- (re-search-backward "`\\([^`']+\\)'" nil t)
- (help-xref-button 1 'help-function-def function file-name)))))
- (princ ".")
- (terpri)
- (when (commandp function)
- (let ((keys (where-is-internal
- function overriding-local-map nil nil)))
- (when keys
- (princ "It is bound to ")
- ;; FIXME: This list can be very long (f.ex. for self-insert-command).
- (princ (mapconcat 'key-description keys ", "))
- (princ ".")
- (terpri))))
- ;; Handle symbols aliased to other symbols.
- (setq def (indirect-function def))
- ;; If definition is a macro, find the function inside it.
- (if (eq (car-safe def) 'macro)
- (setq def (cdr def)))
- (let ((arglist (cond ((byte-code-function-p def)
- (car (append def nil)))
- ((eq (car-safe def) 'lambda)
- (nth 1 def))
- ((and (eq (car-safe def) 'autoload)
- (not (eq (nth 4 def) 'keymap)))
- (concat "[Arg list not available until "
- "function definition is loaded.]"))
- (t t))))
- (cond ((listp arglist)
- (princ (cons (if (symbolp function) function "anonymous")
- (mapcar (lambda (arg)
- (if (memq arg '(&optional &rest))
- arg
- (intern (upcase (symbol-name arg)))))
- arglist)))
- (terpri))
- ((stringp arglist)
- (princ arglist)
- (terpri))))
- (let ((doc (documentation function)))
- (if doc
- (progn (terpri)
- (princ doc)
- (if (subrp def)
- (with-current-buffer standard-output
- (beginning-of-line)
- ;; Builtins get the calling sequence at the end of
- ;; the doc string. Move it to the same place as
- ;; for other functions.
-
- ;; In cases where `function' has been fset to a
- ;; subr we can't search for function's name in
- ;; the doc string. Kluge round that using the
- ;; printed representation. The arg list then
- ;; shows the wrong function name, but that
- ;; might be a useful hint.
- (let* ((rep (prin1-to-string def))
- (name (progn
- (string-match " \\([^ ]+\\)>$" rep)
- (match-string 1 rep))))
- (if (looking-at (format "(%s[ )]" (regexp-quote name)))
- (let ((start (point-marker)))
- (goto-char (point-min))
- (forward-paragraph)
- (insert-buffer-substring (current-buffer) start)
- (insert ?\n)
- (delete-region (1- start) (point-max)))
- (goto-char (point-min))
- (forward-paragraph)
- (insert
- "[Missing arglist. Please make a bug report.]\n")))
- (goto-char (point-max)))))
- (princ "not documented")))))
-
-\f
-;; Variables
-
-;;;###autoload
-(defun variable-at-point ()
- "Return the bound variable symbol found around point.
-Return 0 if there is no such symbol."
- (condition-case ()
- (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)))
-
-;;;###autoload
-(defun describe-variable (variable &optional buffer)
- "Display the full documentation of VARIABLE (a symbol).
-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)
- (setq val (completing-read (if (symbolp v)
- (format
- "Describe variable (default %s): " v)
- "Describe variable: ")
- obarray 'boundp t nil nil
- (if (symbolp v) (symbol-name v))))
- (list (if (equal val "")
- v (intern val)))))
- (unless (bufferp buffer) (setq buffer (current-buffer)))
- (if (not (symbolp variable))
- (message "You did not specify a variable")
- (let (valvoid)
- (help-setup-xref (list #'describe-variable variable buffer)
- (interactive-p))
- (with-output-to-temp-buffer (help-buffer)
- (with-current-buffer buffer
- (prin1 variable)
- (if (not (boundp variable))
- (progn
- (princ " is void")
- (setq valvoid t))
- (let ((val (symbol-value variable)))
- (with-current-buffer standard-output
- (princ "'s value is ")
- (terpri)
- (let ((from (point)))
- (pp val)
- (help-xref-on-pp from (point))
- (if (< (point) (+ from 20))
- (save-excursion
- (goto-char from)
- (delete-char -1)))))))
- (terpri)
- (when (local-variable-p variable)
- (princ (format "Local in buffer %s; " (buffer-name)))
- (if (not (default-boundp variable))
- (princ "globally void")
- (let ((val (default-value 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))
- (if (< (point) (+ from 20))
- (save-excursion
- (goto-char from)
- (delete-char -1)))))))
- (terpri))
- (terpri)
- (with-current-buffer standard-output
- (when (> (count-lines (point-min) (point-max)) 10)
- ;; Note that setting the syntax table like below
- ;; makes forward-sexp move over a `'s' at the end
- ;; of a symbol.
- (set-syntax-table emacs-lisp-mode-syntax-table)
- (goto-char (point-min))
- (if valvoid
- (forward-line 1)
- (forward-sexp 1)
- (delete-region (point) (progn (end-of-line) (point)))
- (insert " value is shown below.\n\n")
- (save-excursion
- (insert "\n\nValue:"))))
- ;; Add a note for variables that have been make-var-buffer-local.
- (when (and (local-variable-if-set-p variable)
- (or (not (local-variable-p variable))
- (with-temp-buffer
- (local-variable-if-set-p variable))))
- (save-excursion
- (forward-line -1)
- (insert "Automatically becomes buffer-local when set in any fashion.\n"))))
- (princ "Documentation:")
- (terpri)
- (let ((doc (documentation-property variable 'variable-documentation)))
- (princ (or doc "not documented as a variable.")))
-
- ;; 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
- ;; has been loaded.
- (if (or (get variable 'custom-type) ; after defcustom
- (get variable 'custom-loads) ; from loaddefs.el
- (get variable 'standard-value)) ; from cus-start.el
- (let ((customize-label "customize"))
- (terpri)
- (terpri)
- (princ (concat "You can " customize-label " this variable."))
- (with-current-buffer standard-output
- (save-excursion
- (re-search-backward
- (concat "\\(" customize-label "\\)") nil t)
- (help-xref-button 1 'help-customize-variable variable)))))
- ;; Make a hyperlink to the library if appropriate. (Don't
- ;; change the format of the buffer's initial line in case
- ;; anything expects the current format.)
- (let ((file-name (symbol-file variable)))
- (when (equal file-name "loaddefs.el")
- ;; Find the real def site of the preloaded variable.
- (let ((location
- (condition-case nil
- (find-variable-noselect variable file-name)
- (error nil))))
- (when location
- (with-current-buffer (car location)
- (goto-char (cdr location))
- (when (re-search-backward
- "^;;; Generated autoloads from \\(.*\\)" nil t)
- (setq file-name (match-string 1)))))))
- (when file-name
- (princ "\n\nDefined in `")
- (princ file-name)
- (princ "'.")
- (with-current-buffer standard-output
- (save-excursion
- (re-search-backward "`\\([^`']+\\)'" nil t)
- (help-xref-button 1 'help-variable-def
- variable file-name)))))
-
- (print-help-return-message)
- (save-excursion
- (set-buffer standard-output)
- ;; Return the text we displayed.
- (buffer-string)))))))
-
-
-;;;###autoload
-(defun describe-syntax (&optional buffer)
- "Describe the syntax specifications in the syntax table of BUFFER.
-The descriptions are inserted in a help buffer, which is then displayed.
-BUFFER defaults to the current buffer."
- (interactive)
- (setq buffer (or buffer (current-buffer)))
- (help-setup-xref (list #'describe-syntax buffer) (interactive-p))
- (with-output-to-temp-buffer (help-buffer)
- (let ((table (with-current-buffer buffer (syntax-table))))
- (with-current-buffer standard-output
- (describe-vector table 'internal-describe-syntax-value)
- (while (setq table (char-table-parent table))
- (insert "\nThe parent syntax table is:")
- (describe-vector table 'internal-describe-syntax-value))))))
-
-(provide 'help-funs)
-
-;;; help-funs.el ends here
projects / emacs.git / commitdiff