-;;; apropos.el --- faster apropos commands.
+;;; apropos.el --- apropos commands for users and programmers.
-;; Copyright (C) 1989, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1989, 1994, 1995 Free Software Foundation, Inc.
;; Author: Joe Wells <jbw@bigbird.bu.edu>
+;; Rewritten: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
;; Keywords: help
;; This file is part of GNU Emacs.
;; Fixed bug, current-local-map can return nil.
;; Change, doesn't calculate key-bindings unless needed.
;; Added super-apropos capability, changed print functions.
-;; Made fast-apropos and super-apropos share code.
-;; Sped up fast-apropos again.
+;;; Made fast-apropos and super-apropos share code.
+;;; Sped up fast-apropos again.
;; Added apropos-do-all option.
-;; Added fast-command-apropos.
+;;; Added fast-command-apropos.
;; Changed doc strings to comments for helping functions.
-;; Made doc file buffer read-only, buried it.
+;;; Made doc file buffer read-only, buried it.
;; Only call substitute-command-keys if do-all set.
+;; Optionally use faces to make the output more legible.
+;; Differentiate between command and function.
+;; Apropos-command (ex command-apropos) does cmd and optionally user var.
+;; Apropos shows all 3 aspects of symbols (fn, var and plist)
+;; Apropos-documentation (ex super-apropos) now finds all it should.
+;; New apropos-value snoops through all values and optionally plists.
+;; Reading DOC file doesn't load nroff.
+;; Added hypertext following of documentation, mouse-2 on variable gives value
+;; from buffer in active window.
+
;;; Code:
+;; I see a degradation of maybe 10-20% only.
(defvar apropos-do-all nil
- "*Whether `apropos' and `super-apropos' should do everything that they can.
-Makes them run 2 or 3 times slower. Set this non-nil if you have a fast
-machine.")
+ "*Whether the apropos commands should do more.
+Slows them down more or less. Set this non-nil if you have a fast machine.")
+
+
+(defvar apropos-use-faces window-system
+ "*Whether the apropos commands display output using bold and italic.
+This looks good, but slows down the commands several times.")
+
-(defun apropos-worthy-symbol-p (symbol)
- "Return non-nil if SYMBOL is not worthless."
- (or (fboundp symbol)
- (boundp symbol)
- (symbol-plist symbol)))
+(defvar apropos-local-map
+ (let ((map (make-sparse-keymap)))
+ (define-key map "\C-m" 'apropos-follow)
+ (define-key map [mouse-2] 'apropos-mouse-follow)
+ (define-key map [down-mouse-2] nil)
+ map)
+ "Local map active when displaying apropos output.")
+
+
+;;;###autoload (fset 'command-apropos 'apropos-command)
;;;###autoload
-(defun apropos (regexp &optional do-all pred no-header)
- "Show all symbols whose names contain matches for REGEXP.
-If optional argument DO-ALL is non-nil (prefix argument if interactive),
-or if `apropos-do-all' is non-nil, does more (time-consuming) work such as
-showing key bindings. Optional argument PRED is called with each symbol, and
-if it returns nil, the symbol is not shown. If PRED is nil, the
-default predicate is that the symbol has a value, function definition
-or property list.
-
-Optional argument NO-HEADER means don't print `Function:' or `Variable:'
-in the output.
+(defun apropos-command (regexp &optional do-all)
+ "Shows commands (interactively callable functions) that match REGEXP.
+With optional prefix ARG or if `apropos-do-all' is non-nil, also show
+variables."
+ (interactive (list (read-string (concat "Apropos command "
+ (if (or current-prefix-arg
+ apropos-do-all)
+ "or variable ")
+ "(regexp): "))
+ (or current-prefix-arg apropos-do-all)))
+ (let ((message
+ (let ((standard-output (get-buffer-create "*Help*")))
+ (print-help-return-message 'identity))))
+ (if (apropos-print
+ regexp
+ (apropos-internal regexp
+ (if do-all
+ (lambda (x) (or (commandp x)
+ (user-variable-p x)))
+ 'commandp))
+ t
+ (lambda (p)
+ (let (doc symbol)
+ (while p
+ (setcar p (list
+ (setq symbol (car p))
+ (if (commandp symbol)
+ (if (setq doc (documentation symbol t))
+ (substring doc 0 (string-match "\n" doc))
+ "(not documented)"))
+ (and do-all
+ (user-variable-p symbol)
+ (if (setq doc (documentation-property
+ symbol 'variable-documentation t))
+ (substring doc 0
+ (string-match "\n" doc))))))
+ (setq p (cdr p)))))
+ nil)
+ (and message (message message)))))
+
+
+;;;###autoload
+(defun apropos (regexp &optional do-all)
+ "Show all symbols whose names match REGEXP.
+With optional prefix ARG or if `apropos-do-all' is non-nil, also show key
+bindings, which is a little more time-consuming.
Returns list of symbols and documentation found."
- (interactive "sApropos (regexp): \nP")
- (setq do-all (or apropos-do-all do-all))
- (setq pred (or pred 'apropos-worthy-symbol-p))
- (let ((apropos-accumulate (apropos-internal regexp pred)))
- (if (null apropos-accumulate)
- (message "No apropos matches for `%s'" regexp)
- (apropos-get-doc apropos-accumulate)
- (with-output-to-temp-buffer "*Help*"
- (apropos-print-matches apropos-accumulate regexp nil
- do-all no-header)))
- apropos-accumulate))
-
-;; Takes LIST of symbols and adds documentation. Modifies LIST in place.
-;; Resulting alist is of form ((symbol fn-doc var-doc) ...). Should only be
-;; called by apropos. Returns LIST.
-
-(defun apropos-get-doc (list)
- (let ((p list)
- fn-doc var-doc symbol)
- (while (consp p)
- (setq symbol (car p)
- fn-doc (and (fboundp symbol)
- (documentation symbol))
- var-doc (documentation-property symbol 'variable-documentation)
- fn-doc (and fn-doc
- (substring fn-doc 0 (string-match "\n" fn-doc)))
- var-doc (and var-doc
- (substring var-doc 0 (string-match "\n" var-doc))))
- (setcar p (list symbol fn-doc var-doc))
- (setq p (cdr p)))
- list))
-
-;; Variables bound by super-apropos and used by its subroutines.
-;; It would be good to say what each one is for, but I don't know -- rms.
-(defvar apropos-item)
-(defvar apropos-var-doc)
-(defvar apropos-fn-doc)
-(defvar apropos-accumulate)
-(defvar apropos-regexp
- "Within `super-apropos', this holds the REGEXP argument.")
-(defvar apropos-files-scanned)
+ (interactive "sApropos symbol (regexp): \nP")
+ (apropos-print
+ regexp (apropos-internal regexp)
+ (or apropos-do-all do-all)
+ (lambda (p)
+ (let (symbol doc)
+ (while p
+ (setcar p (list
+ (setq symbol (car p))
+ (if (fboundp symbol)
+ (if (setq doc (documentation symbol t))
+ (substring doc 0 (string-match "\n" doc))
+ "(not documented)"))
+ (if (boundp symbol)
+ (if (setq doc (documentation-property
+ symbol 'variable-documentation t))
+ (substring doc 0
+ (string-match "\n" doc))
+ "(not documented)"))
+ (if (setq doc (symbol-plist symbol))
+ (if (eq (setq doc (/ (length doc) 2)) 1)
+ "1 property"
+ (concat doc " properties")))))
+ (setq p (cdr p)))))
+ nil))
+
+
;;;###autoload
-(defun super-apropos (regexp &optional do-all)
- "Show symbols whose names/documentation contain matches for REGEXP.
-If optional argument DO-ALL is non-nil (prefix argument if interactive),
-or if `apropos-do-all' is non-nil, does more (time-consuming) work such as
-showing key bindings and documentation that is not stored in the documentation
-file.
+(defun apropos-value (regexp &optional do-all)
+ "Show all symbols whose value's printed image matches REGEXP.
+With optional prefix ARG or if `apropos-do-all' is non-nil, also looks
+at the function and at the names and values of properties.
+Returns list of symbols and documentation found."
+ (interactive "sApropos value (regexp): \nP")
+ (setq do-all (or apropos-do-all do-all))
+ (apropos-print
+ regexp
+ (let (accumulator f v p)
+ (mapatoms
+ (lambda (symbol)
+ (setq f nil v nil p nil)
+ (or (memq symbol '(regexp do-all accumulator symbol v pl p))
+ (if (boundp symbol)
+ (setq v (prin1-to-string (symbol-value symbol))
+ v (if (string-match regexp v) v))))
+ (if do-all
+ (progn
+ (if (fboundp symbol)
+ (setq f (prin1-to-string (symbol-function symbol))
+ f (if (string-match regexp f) f)))
+ (setq p (apropos-format-plist symbol "\n " regexp))))
+ ;; (if p-out (insert p-out))
+ (if (or f v p)
+ (setq accumulator (cons (list symbol f v p) accumulator)))))
+ accumulator)
+ nil nil t))
+
+
+(defun apropos-format-plist (pl sep &optional regexp)
+ (setq pl (symbol-plist pl))
+ (let (p p-out)
+ (while pl
+ (setq p (format "%s %S" (car pl) (nth 1 pl)))
+ (if (string-match (or regexp "") p)
+ (if apropos-use-faces
+ (put-text-property 0 (length (symbol-name (car pl)))
+ 'face 'bold-italic p))
+ (setq p nil))
+ (if p (setq p-out (concat p-out (if p-out sep) p)))
+ (setq pl (nthcdr 2 pl)))
+ p-out))
+
+
+;;;###autoload
+(defun apropos-documentation (regexp &optional do-all)
+ "Show symbols whose names or documentation contain matches for REGEXP.
+With optional prefix ARG or if `apropos-do-all' is non-nil, also use
+documentation that is not stored in the documentation file and show key
+bindings.
Returns list of symbols and documentation found."
- (interactive "sSuper Apropos: \nP")
+ (interactive "sApropos documentation (regexp): \nP")
(setq do-all (or apropos-do-all do-all))
- (let ((apropos-regexp regexp)
- apropos-accumulate apropos-fn-doc apropos-var-doc apropos-item
- apropos-files-scanned)
- (setq apropos-accumulate
- (super-apropos-check-doc-file apropos-regexp))
- (if do-all (mapatoms 'super-apropos-accumulate))
- (if (null apropos-accumulate)
- (message "No apropos matches for `%s'" apropos-regexp)
- (with-output-to-temp-buffer "*Help*"
- (setq apropos-accumulate
- (apropos-print-matches apropos-accumulate nil t do-all))))
- apropos-accumulate))
+ (let (accumulator fn-doc var-doc item)
+ (setq accumulator (apropos-documentation-check-doc-file regexp))
+ (if do-all
+ (mapatoms
+ (lambda (symbol)
+ (setq fn-doc (safe-documentation symbol)
+ var-doc (get symbol 'variable-documentation))
+ (if (numberp var-doc)
+ (setq var-doc nil))
+ (if (string-match regexp (symbol-name symbol))
+ ()
+ (if fn-doc
+ (or (string-match regexp fn-doc)
+ (setq fn-doc nil)))
+ (if var-doc
+ (or (string-match regexp var-doc)
+ (setq var-doc nil))))
+ (if (or fn-doc var-doc)
+ (if (setq item (cdr (assq symbol accumulator)))
+ (progn
+ (if fn-doc
+ (setcar item fn-doc))
+ (if var-doc
+ (setcar (cdr item) var-doc)))
+ (setq accumulator
+ (cons (list symbol fn-doc var-doc)
+ accumulator)))))))
+ (apropos-print regexp accumulator do-all nil t)))
+
+\f
;; Finds all documentation related to REGEXP in internal-doc-file-name.
;; Returns an alist of form ((symbol fn-doc var-doc) ...).
-(defun super-apropos-check-doc-file (regexp)
- (let* ((doc-file (concat doc-directory internal-doc-file-name))
- (doc-buffer (get-buffer-create " apropos-temp"))
- type symbol doc sym-list)
- (unwind-protect
- (save-excursion
- (set-buffer doc-buffer)
- (buffer-disable-undo)
- (erase-buffer)
- (insert-file-contents doc-file)
- (while (re-search-forward regexp nil t)
- (search-backward "\C-_")
- (setq type (if (eq ?F (char-after (1+ (point))))
- 1 ;function documentation
- 2) ;variable documentation
- symbol (progn
- (forward-char 2)
- (read doc-buffer))
- doc (buffer-substring
- (point)
- (progn
- (if (search-forward "\C-_" nil 'move)
- (1- (point))
- (point))))
- apropos-item (assq symbol sym-list))
- (and (if (= type 1)
- (and (fboundp symbol) (documentation symbol))
- (documentation-property symbol 'variable-documentation))
- (or apropos-item
- (setq apropos-item (list symbol nil nil)
- sym-list (cons apropos-item sym-list)))
- (setcar (nthcdr type apropos-item) doc))))
- (kill-buffer doc-buffer))
+(defun apropos-documentation-check-doc-file (regexp)
+ (let ((doc-buffer (get-buffer-create " *apropos-doc*"))
+ ;; item is already let
+ type symbol sym-list)
+ (set-buffer doc-buffer)
+ (goto-char (point-min))
+ (if (eobp)
+ (insert-file-contents (concat doc-directory internal-doc-file-name)))
+ (while (re-search-forward regexp nil t)
+ (search-backward "\C-_")
+ (or (setq type (if (eq ?F (char-after (1+ (point))))
+ 1 ;function documentation
+ 2) ;variable documentation
+ symbol (progn
+ (forward-char 2)
+ (read doc-buffer))
+ doc (buffer-substring
+ (1+ (point))
+ (if (search-forward "\C-_" nil 'move)
+ (1- (point))
+ (point)))
+ item (assq symbol sym-list))
+ (setq item (list symbol nil nil)
+ sym-list (cons item sym-list)))
+ (setcar (nthcdr type item) doc))
sym-list))
-(defun super-apropos-check-elc-file (regexp file)
- (let* ((doc-buffer (get-buffer-create " apropos-temp"))
- symbol doc length beg end this-is-a-variable)
- (unwind-protect
- (save-excursion
- (set-buffer doc-buffer)
- (buffer-disable-undo)
- (erase-buffer)
- (insert-file-contents file)
- (while (search-forward "\n#@" nil t)
- ;; Read the comment length, and advance over it.
- (setq length (read (current-buffer)))
- (setq beg (point))
- (setq end (+ (point) length 1))
- (if (re-search-forward regexp end t)
- (progn
- (setq this-is-a-variable (save-excursion
- (goto-char end)
- (looking-at "(defvar\\|(defconst"))
- symbol (save-excursion
- (goto-char end)
- (skip-chars-forward "(a-z")
- (forward-char 1)
- (read doc-buffer))
- symbol (if (consp symbol)
- (nth 1 symbol)
- symbol)
- doc (buffer-substring (1+ beg) (- end 2))
- apropos-item (assq symbol apropos-accumulate))
- (and (if this-is-a-variable
- (documentation-property symbol 'variable-documentation)
- (and (fboundp symbol) (documentation symbol)))
- (or apropos-item
- (setq apropos-item (list symbol nil nil)
- apropos-accumulate (cons apropos-item
- apropos-accumulate)))
- (setcar (nthcdr (if this-is-a-variable 2 1)
- apropos-item)
- doc))))
- (goto-char end)))
- (kill-buffer doc-buffer))
- apropos-accumulate))
-
-;; This is passed as the argument to map-atoms, so it is called once for every
-;; symbol in obarray. Takes one argument SYMBOL, and finds any memory-resident
-;; documentation on that symbol if it matches a variable regexp.
-
-(defun super-apropos-accumulate (symbol)
- (let (doc)
- (cond ((string-match apropos-regexp (symbol-name symbol))
- (setq apropos-item (apropos-get-accum-item symbol))
- (setcar (cdr apropos-item)
- (or (safe-documentation symbol)
- (nth 1 apropos-item)))
- (setcar (nthcdr 2 apropos-item)
- (or (safe-documentation-property symbol)
- (nth 2 apropos-item))))
- ((or (consp (setq doc (safe-documentation symbol)))
- (consp (setq doc (safe-documentation-property symbol))))
- ;; This symbol's doc is stored in a file.
- ;; Scan the file if we have not scanned it before.
- (let ((file (car doc)))
- (or (member file apropos-files-scanned)
- (progn
- (setq apropos-files-scanned
- (cons file apropos-files-scanned))
- (super-apropos-check-elc-file apropos-regexp file)))))
- (t
- (and (stringp (setq doc (safe-documentation symbol)))
- (setq apropos-fn-doc doc)
- (string-match apropos-regexp apropos-fn-doc)
- (setcar (cdr (apropos-get-accum-item symbol)) apropos-fn-doc))
- (and (stringp (setq doc (safe-documentation-property symbol)))
- (setq apropos-var-doc doc)
- (string-match apropos-regexp apropos-var-doc)
- (setcar (nthcdr 2 (apropos-get-accum-item symbol))
- apropos-var-doc)))))
- nil)
-
-;; Prints the symbols and documentation in alist MATCHES of form ((symbol
-;; fn-doc var-doc) ...). Uses optional argument REGEXP to speed up searching
-;; for keybindings. The names of all symbols in MATCHES must match REGEXP.
-;; Displays in the buffer pointed to by standard-output. Optional argument
-;; SPACING means put blank lines in between each symbol's documentation.
-;; Optional argument DO-ALL means do more time-consuming work, specifically,
-;; consulting key bindings. Should only be called within a
-;; with-output-to-temp-buffer.
-
-(defun apropos-print-matches (matches &optional regexp
- spacing do-all no-header)
- (setq matches (sort matches (function
- (lambda (a b)
- (string-lessp (car a) (car b))))))
- (let ((p matches)
- (old-buffer (current-buffer))
- item keys-done symbol tem)
- (save-excursion
- (set-buffer standard-output)
- (or matches (princ "No matches found."))
- (while (consp p)
- (setq item (car p)
- symbol (car item)
- p (cdr p))
- (or (not spacing) (bobp) (terpri))
- (princ symbol) ;print symbol name
- ;; don't calculate key-bindings unless needed
- (cond ((and do-all (commandp symbol) (not keys-done))
- (save-excursion
- (set-buffer old-buffer)
- (apropos-match-keys matches regexp))
- (setq keys-done t)))
- (cond ((and do-all
- (or (setq tem (nthcdr 3 item))
- (commandp symbol)))
- (indent-to 30 1)
- (if tem
- (princ (mapconcat 'key-description tem ", "))
- (princ "(not bound to any keys)"))))
- (terpri)
- (cond ((setq tem (nth 1 item))
- (let ((substed (if do-all (substitute-command-keys tem) tem)))
- (if no-header
- (princ " ")
- (princ " Function: ")
- (if (> (length substed) 67)
- (princ "\n ")))
- (princ substed))))
- (or (bolp) (terpri))
- (cond ((setq tem (nth 2 item))
- (let ((substed (if do-all (substitute-command-keys tem) tem)))
- (if no-header
- (princ " ")
- (princ " Variable: ")
- (if (> (length substed) 67)
- (princ "\n ")))
- (princ substed))))
- (or (bolp) (terpri)))
- (help-mode)))
- matches)
-
-;; Find key bindings for symbols that are cars in ALIST. Optionally, first
-;; match the symbol name against REGEXP. Modifies ALIST in place. Each key
-;; binding is added as a string to the end of the list in ALIST whose car is
-;; the corresponding symbol. The pointer to ALIST is returned.
-
-(defun apropos-match-keys (alist &optional regexp)
- (let* ((current-local-map (current-local-map))
- ;; Get a list of the top-level maps now active.
- (top-maps
- (if overriding-local-map
- (list overriding-local-map (current-global-map))
- (append (current-minor-mode-maps)
- (if current-local-map
- (list current-local-map (current-global-map))
- (list (current-global-map))))))
- ;; Turn that into a list of all the maps including submaps.
- (maps (apply 'append (mapcar 'accessible-keymaps top-maps)))
- map ;map we are now inspecting
- sequence ;key sequence to reach map
- i ;index into vector map
- command ;what is bound to current keys
- key ;last key to reach command
- local ;local binding for sequence + key
- item) ;symbol data item in alist
- ;; examine all reachable keymaps
- (while (consp maps)
- (setq map (cdr (car maps))
- sequence (car (car maps)) ;keys to reach this map
- maps (cdr maps))
- ;; Skip the leading `keymap', doc string, etc.
- (if (eq (car map) 'keymap)
- (setq map (cdr map)))
- (while (stringp (car-safe map))
- (setq map (cdr map)))
-
- (while (consp map)
- (cond ((consp (car map))
- (setq command (cdr (car map))
- key (car (car map)))
- ;; Skip any menu prompt and help string in this key binding.
- (while (and (consp command) (stringp (car command)))
- (setq command (cdr command)))
- ;; Skip any cached equivalent key.
- (and (consp command)
- (consp (car command))
- (setq command (cdr command)))
- ;; if is a symbol, and matches optional regexp, and is a car
- ;; in alist, and is not shadowed by a different local binding,
- ;; record it
- (and (symbolp command)
- (if regexp
- (string-match regexp (symbol-name command))
- t)
- (setq item (assq command alist))
- (if (or (vectorp sequence) (not (integerp key)))
- (setq key (vconcat sequence (vector key)))
- (setq key (concat sequence (char-to-string key))))
- ;; checking if shadowed by local binding.
- ;; either no local map, no local binding, or runs off the
- ;; binding tree (number), or is the same binding
- (or (not current-local-map)
- (not (setq local (lookup-key current-local-map key)))
- (numberp local)
- (eq command local))
- ;; check if this binding is already recorded
- ;; (this can happen due to inherited keymaps)
- (not (member key (nthcdr 3 item)))
- ;; add this key binding to the item in alist
- (nconc item (cons key nil))))
- ((vectorp (car map))
- (let ((i 0)
- (vec (car map))
- (len (length (car map))))
- (while (< i len)
- (setq command (aref vec i))
- (setq key i)
- ;; Skip any menu prompt in this key binding.
- (and (consp command) (symbolp (cdr command))
- (setq command (cdr command)))
- ;; This is the same as the code in the previous case.
- (and (symbolp command)
- (if regexp
- (string-match regexp (symbol-name command))
- t)
- (setq item (assq command alist))
- (if (or (vectorp sequence) (not (integerp key)))
- (setq key (vconcat sequence (vector key)))
- (setq key (concat sequence (char-to-string key))))
- ;; checking if shadowed by local binding.
- ;; either no local map, no local binding, or runs off the
- ;; binding tree (number), or is the same binding
- (or (not current-local-map)
- (not (setq local (lookup-key current-local-map key)))
- (numberp local)
- (eq command local))
- ;; check if this binding is already recorded
- ;; (this can happen due to inherited keymaps)
- (not (member key (nthcdr 3 item)))
- ;; add this key binding to the item in alist
- (nconc item (cons key nil)))
- (setq i (1+ i))))))
- (setq map (cdr map)))))
- alist)
-
-;; Get an alist item in alist apropos-accumulate whose car is SYMBOL. Creates
-;; the item if not already present. Modifies apropos-accumulate in place.
-
-(defun apropos-get-accum-item (symbol)
- (or (assq symbol apropos-accumulate)
- (progn
- (setq apropos-accumulate
- (cons (list symbol nil nil) apropos-accumulate))
- (assq symbol apropos-accumulate))))
+
+
+;; This function is misnamed, it is simply a variety of the original
+;; that might be handled easier and more efficiently by that with a flag.
+;; Otherwise it might be inlined above.
(defun safe-documentation (function)
"Like documentation, except it avoids calling `get_doc_string'.
Will return nil instead."
- (while (symbolp function)
+ (while (and function (symbolp function))
(setq function (if (fboundp function)
- (symbol-function function)
- 0)))
+ (symbol-function function))))
(if (eq (car-safe function) 'macro)
(setq function (cdr function)))
- (if (byte-code-function-p function)
- (if (> (length function) 4)
- (aref function 4))
- (if (not (consp function))
- nil
- (if (not (memq (car function) '(lambda autoload)))
- nil
- (setq function (nth 2 function))
- (if (stringp function)
- function
- nil)))))
-
-(defun safe-documentation-property (symbol)
- "Like documentation-property, except it avoids calling `get_doc_string'.
-Will return nil instead."
- (setq symbol (get symbol 'variable-documentation))
- (if (numberp symbol)
- nil
- symbol))
+ (setq function (if (byte-code-function-p function)
+ (condition-case nil
+ (aref function 4)
+ (error))
+ (if (memq (car-safe function) '(lambda autoload))
+ (nth 2 function))))
+ (if (stringp function)
+ function))
+
+
+
+(defun apropos-print (regexp apropos-result do-keys doc-fn spacing)
+ "Output result of various appropos commands with REGEXP.
+APROPOS-RESULT is a list. Optional DOC-FN is called for each element
+of apropos-result and may modify it resulting in (symbol fn-doc
+var-doc [plist-doc]). Returns sorted list of symbols and documentation
+found."
+ (if (null apropos-result)
+ (message "No apropos matches for `%s'" regexp)
+ (if doc-fn
+ (funcall doc-fn apropos-result))
+ (setq apropos-result
+ (sort apropos-result (lambda (a b)
+ (string-lessp (car a) (car b)))))
+ (with-output-to-temp-buffer "*Help*"
+ (let ((p apropos-result)
+ (old-buffer (current-buffer))
+ symbol item tem point1 point2)
+ (save-excursion
+ (set-buffer standard-output)
+ (if window-system
+ (insert (substitute-command-keys
+ "Click \\<apropos-local-map>\\[apropos-mouse-follow] to get full documentation.\n")))
+ (insert (substitute-command-keys
+ "In this buffer, type \\<apropos-local-map>\\[apropos-follow] to get full documentation.\n\n"))
+ (while (consp p)
+ (or (not spacing) (bobp) (terpri))
+ (setq item (car p)
+ symbol (car item)
+ p (cdr p)
+ point1 (point))
+ (princ symbol) ;print symbol name
+ (setq point2 (point))
+ ;; don't calculate key-bindings unless needed
+ (and do-keys
+ (commandp symbol)
+ (indent-to 30 1)
+ (princ (if (setq tem (save-excursion
+ (set-buffer old-buffer)
+ (where-is-internal symbol)))
+ (mapconcat 'key-description tem ", ")
+ "(not bound to any keys)")))
+ (terpri)
+ ;; only now so we don't propagate text attributes all over
+ (put-text-property point1 (1+ point1) 'item
+ (if (or (nth 1 item) (nth 2 item) (nth 3 item))
+ (car item)
+ item))
+ (if apropos-use-faces
+ (put-text-property point1 point2 'face 'bold))
+ (apropos-print-documentation 'describe-function (nth 1 item)
+ (if (commandp symbol)
+ "Command: "
+ "Function: ")
+ do-keys)
+ (apropos-print-documentation 'describe-variable (nth 2 item)
+ "Variable: " do-keys)
+ (apropos-print-documentation 'apropos-describe-plist (nth 3 item)
+ "Plist: " nil))
+ (put-text-property 1 (point) 'local-map apropos-local-map)))))
+ apropos-result)
+
+
+(defun apropos-print-documentation (action tem str do-keys)
+ (if tem
+ (progn
+ (insert " ")
+ (put-text-property (- (point) 2) (1- (point))
+ 'action action)
+ (princ str)
+ (if apropos-use-faces
+ (add-text-properties (- (point) (length str))
+ (1- (point))
+ '(face italic
+ mouse-face highlight)))
+ (insert (if do-keys (substitute-command-keys tem) tem))))
+ (or (bolp) (terpri)))
+
+
+
+(defun apropos-mouse-follow (event)
+ (interactive "e")
+ (let ((other (if (eq (current-buffer) (get-buffer "*Help*"))
+ ()
+ (current-buffer))))
+ (set-buffer (window-buffer (posn-window (event-start event))))
+ (goto-char (posn-point (event-start event)))
+ ;; somehow when clicking with the point in another window, doesn't undo
+ (undo-boundary)
+ (apropos-follow other)))
+
+
+(defun apropos-follow (&optional other)
+ (interactive)
+ (let ((point (point))
+ (item (get-text-property (point) 'item))
+ action action-point)
+ (or item
+ (setq item (if (bobp)
+ ()
+ (previous-single-property-change (point) 'item))
+ item (get-text-property
+ (1- (goto-char
+ (if item
+ item
+ (1+ (next-single-property-change (point) 'item)))))
+ 'item)))
+ (if (consp item)
+ (error "%s is just a lonely smbol." (car item)))
+ (while (if (setq action-point
+ (next-single-property-change (point) 'action))
+ (<= action-point point))
+ (goto-char (1+ action-point))
+ (setq action action-point))
+ (funcall
+ (prog1 (get-text-property (or action action-point (point)) 'action)
+ (if other (set-buffer other)))
+ item))
+ (message "%sype %s (undo) to get back to apropos-listing."
+ (if other "In *Help* buffer t" "T")
+ (key-description (where-is-internal 'undo nil 1))))
+
+
+
+(defun apropos-describe-plist (symbol)
+ "Display a pretty listing of SYMBOL's plist."
+ (with-output-to-temp-buffer "*Help*"
+ (set-buffer standard-output)
+ (princ "Symbol ")
+ (prin1 symbol)
+ (princ "'s plist is\n (")
+ (if apropos-use-faces
+ (put-text-property 8 (- (point) 14) 'face 'bold))
+ (insert (apropos-format-plist symbol "\n "))
+ (princ ")")))
;;; apropos.el ends here