;;; help-fns.el --- Complex help functions
-;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001
+;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002, 2003
;; Free Software Foundation, Inc.
;; Maintainer: FSF
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."
+With ARG, you are asked to choose which language."
(interactive "P")
(let ((lang (if arg
- (read-language-name 'tutorial "Language: " "English")
+ (let ((minibuffer-setup-hook minibuffer-setup-hook))
+ (add-hook 'minibuffer-setup-hook
+ 'minibuffer-completion-help)
+ (read-language-name 'tutorial "Language: " "English"))
(if (get-language-info current-language-environment 'tutorial)
current-language-environment
"English")))
(goto-char (point-min))
(search-forward "\n<<")
(beginning-of-line)
- (delete-region (point) (progn (end-of-line) (point)))
+ ;; Convert the <<...>> line to the proper [...] line,
+ ;; or just delete the <<...>> line if a [...] line follows.
+ (cond ((save-excursion
+ (forward-line 1)
+ (looking-at "\\["))
+ (delete-region (point) (progn (forward-line 1) (point))))
+ ((looking-at "<<Blank lines inserted.*>>")
+ (replace-match "[Middle of page left blank for didactic purposes. Text continues below]"))
+ (t
+ (looking-at "<<")
+ (replace-match "[")
+ (search-forward ">>")
+ (replace-match "]")))
+ (beginning-of-line)
(let ((n (- (window-height (selected-window))
(count-lines (point-min) (point))
6)))
- (if (< n 12)
- (newline n)
+ (if (< n 8)
+ (progn
+ ;; For a short gap, we don't need the [...] line,
+ ;; so delete it.
+ (delete-region (point) (progn (end-of-line) (point)))
+ (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]")
+
+ ;; Skip the [...] line (don't delete it).
+ (forward-line 1)
(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.
+This command searches the directories in `load-path' like `\\[load-library]'
+to find the file that `\\[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.
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: ")
+ (interactive (list (completing-read "Locate library: "
+ 'locate-file-completion
+ (cons load-path load-suffixes))
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))))))
+ (let ((file (locate-file library
+ (or path load-path)
+ (append (unless nosuffix load-suffixes) '("")))))
(if interactive-call
- (message "No library %s in search path" library))
- nil))
+ (if file
+ (message "Library is file %s" (abbreviate-file-name file))
+ (message "No library %s in search path" library)))
+ file))
\f
;; Functions
(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)))))
+ (save-excursion
+ (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))))))
+
+(defun help-split-fundoc (doc def)
+ "Split a function docstring DOC into the actual doc and the usage info.
+Return (USAGE . DOC) or nil if there's no usage info.
+DEF is the function whose usage we're looking for in DOC."
+ ;; Functions can get the calling sequence at the end of the doc string.
+ ;; In cases where `function' has been fset to a subr we can't search for
+ ;; function's name in the doc string so we use `fn' as the anonymous
+ ;; function name instead.
+ (when (and doc (string-match "\n\n(fn\\(\\( .*\\)?)\\)\\'" doc))
+ (cons (format "(%s%s"
+ ;; Replace `fn' with the actual function name.
+ (if (consp def) "anonymous" def)
+ (match-string 1 doc))
+ (substring doc 0 (match-beginning 0)))))
+
+(defun help-add-fundoc-usage (doc arglist)
+ "Add the usage info to the docstring DOC.
+If DOC already has a usage info, then just return DOC unchanged.
+The usage info is built from ARGLIST. DOC can be nil.
+ARGLIST can also be t or a string of the form \"(fun ARG1 ARG2 ...)\"."
+ (unless (stringp doc) (setq doc "Not documented"))
+ (if (or (string-match "\n\n(fn\\(\\( .*\\)?)\\)\\'" doc) (eq arglist t))
+ doc
+ (format "%s%s%s" doc
+ (if (string-match "\n?\n\\'" doc)
+ (if (< (- (match-end 0) (match-beginning 0)) 2) "\n" "")
+ "\n\n")
+ (if (and (stringp arglist)
+ (string-match "\\`([^ ]+\\(.*\\))\\'" arglist))
+ (concat "(fn" (match-string 1 arglist) ")")
+ (help-make-usage 'fn arglist)))))
+
+(defun help-function-arglist (def)
+ ;; Handle symbols aliased to other symbols.
+ (if (and (symbolp def) (fboundp def)) (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)))
+ (cond
+ ((byte-code-function-p def) (aref def 0))
+ ((eq (car-safe def) 'lambda) (nth 1 def))
+ ((and (eq (car-safe def) 'autoload) (not (eq (nth 4 def) 'keymap)))
+ "[Arg list not available until function definition is loaded.]")
+ (t t)))
+
+(defun help-make-usage (function arglist)
+ (cons (if (symbolp function) function 'anonymous)
+ (mapcar (lambda (arg)
+ (if (not (symbolp arg))
+ (if (and (consp arg) (symbolp (car arg)))
+ ;; CL style default values for optional args.
+ (cons (intern (upcase (symbol-name (car arg))))
+ (cdr arg))
+ arg)
+ (let ((name (symbol-name arg)))
+ (if (string-match "\\`&" name) arg
+ (intern (upcase name))))))
+ arglist)))
;;;###autoload
(defun describe-function-1 (function)
(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)
+ ((keymapp def)
(let ((is-full nil)
(elts (cdr-safe def)))
(while elts
(help-xref-button 1 'help-function def)))))
(or file-name
(setq file-name (symbol-file function)))
+ (when (equal file-name "loaddefs.el")
+ ;; Find the real def site of the preloaded function.
+ ;; This is necessary only for defaliases.
+ (let ((location
+ (condition-case nil
+ (find-function-search-for-symbol function nil "loaddefs.el")
+ (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)))))))
(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.
+ (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)
+ (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)))
+ (let* ((remapped (command-remapping function))
+ (keys (where-is-internal
+ (or remapped function) overriding-local-map nil nil)))
+ (when remapped
+ (princ "It is remapped to `")
+ (princ (symbol-name remapped))
+ (princ "'"))
(when keys
- (princ "It is bound to ")
+ (princ (if remapped " which is bound to " "It is bound to "))
;; FIXME: This list can be very long (f.ex. for self-insert-command).
- (princ (mapconcat 'key-description keys ", "))
+ (princ (mapconcat 'key-description keys ", ")))
+ (when (or remapped 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")))))
+ (let* ((arglist (help-function-arglist def))
+ (doc (documentation function))
+ (usage (help-split-fundoc doc function)))
+ ;; If definition is a keymap, skip arglist note.
+ (unless (keymapp def)
+ (princ (cond
+ (usage (setq doc (cdr usage)) (car usage))
+ ((listp arglist) (help-make-usage function arglist))
+ ((stringp arglist) arglist)
+ ;; Maybe the arglist is in the docstring of the alias.
+ ((let ((fun function))
+ (while (and (symbolp fun)
+ (setq fun (symbol-function fun))
+ (not (setq usage (help-split-fundoc
+ (documentation fun)
+ function)))))
+ usage)
+ (car usage))
+ ((or (stringp def)
+ (vectorp def))
+ (format "\nMacro: %s" (format-kbd-macro def)))
+ (t "[Missing arglist. Please make a bug report.]")))
+ (terpri))
+ (let ((obsolete (and
+ ;; function might be a lambda construct.
+ (symbolp function)
+ (get function 'byte-obsolete-info))))
+ (when obsolete
+ (terpri)
+ (princ "This function is obsolete")
+ (if (nth 2 obsolete) (princ (format " since %s" (nth 2 obsolete))))
+ (princ ";") (terpri)
+ (princ (if (stringp (car obsolete)) (car obsolete)
+ (format "use `%s' instead." (car obsolete))))
+ (terpri)))
+ (terpri)
+ (princ (or doc "Not documented.")))))
\f
;; Variables
(if (symbolp v) (symbol-name v))))
(list (if (equal val "")
v (intern val)))))
- (unless (bufferp buffer) (setq buffer (current-buffer)))
+ (unless (buffer-live-p 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
+ (save-excursion
+ (let* ((valvoid (not (with-current-buffer buffer (boundp variable))))
+ ;; Extract the value before setting up the output buffer,
+ ;; in case `buffer' *is* the output buffer.
+ (val (unless valvoid (buffer-local-value variable buffer))))
+ (help-setup-xref (list #'describe-variable variable buffer)
+ (interactive-p))
+ (with-output-to-temp-buffer (help-buffer)
+ (with-current-buffer buffer
+ (prin1 variable)
+ (if valvoid
(princ " is void")
- (setq valvoid t))
- (let ((val (symbol-value variable)))
(with-current-buffer standard-output
(princ "'s value is ")
(terpri)
(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")
+ (delete-region (1- from) from)))))
+ (terpri)
+ (when (local-variable-p variable)
+ (princ (format "%socal in buffer %s; "
+ (if (get variable 'permanent-local)
+ "Permanently l" "L")
+ (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))
+ (delete-region (1- from) from))))))
+ (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
- (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."))
+ (forward-line -1)
+ (insert "Automatically becomes buffer-local when set in any fashion.\n"))))
+ ;; Mention if it's an alias
+ (let* ((alias (condition-case nil
+ (indirect-variable variable)
+ (error variable)))
+ (obsolete (get variable 'byte-obsolete-variable))
+ (doc (or (documentation-property variable 'variable-documentation)
+ (documentation-property alias 'variable-documentation))))
+ (unless (eq alias variable)
+ (princ (format "This variable is an alias for `%s'." alias))
+ (terpri)
+ (terpri))
+ (when obsolete
+ (princ "This variable is obsolete")
+ (if (cdr obsolete) (princ (format " since %s" (cdr obsolete))))
+ (princ ";") (terpri)
+ (princ (if (stringp (car obsolete)) (car obsolete)
+ (format "use `%s' instead." (car obsolete))))
+ (terpri)
+ (terpri))
+ (princ (or doc "Not documented as a variable.")))
+ ;; Make a link to customize if this variable can be customized.
+ (if (custom-variable-p variable)
+ (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 (cons 'defvar 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
- (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)))))))
+ (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
HCoop / bpt / emacs.git / blobdiff