1 ;;; imenu.el --- Framework for mode-specific buffer indexes.
3 ;; Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
5 ;; Author: Ake Stenhoff <etxaksf@aom.ericsson.se>
6 ;; Lars Lindberg <lli@sypro.cap.se>
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software; you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 2, or (at your option)
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
25 ;; Boston, MA 02111-1307, USA.
29 ;; Purpose of this package:
30 ;; To present a framework for mode-specific buffer indexes.
31 ;; A buffer index is an alist of names and buffer positions.
32 ;; For instance all functions in a C-file and their positions.
36 ;; A mode-specific function is called to generate the index. It is
37 ;; then presented to the user, who can choose from this index.
39 ;; The package comes with a set of example functions for how to
40 ;; utilize this package.
42 ;; There are *examples* for index gathering functions/regular
43 ;; expressions for C/C++ and Lisp/Emacs Lisp but it is easy to
44 ;; customize for other modes. A function for jumping to the chosen
45 ;; index position is also supplied.
48 ;; [simon] - Simon Leinen simon@lia.di.epfl.ch
49 ;; [dean] - Dean Andrews ada@unison.com
50 ;; [alon] - Alon Albert al@mercury.co.il
51 ;; [greg] - Greg Thompson gregt@porsche.visix.COM
52 ;; [wolfgang] - Wolfgang Bangerth zcg51122@rpool1.rus.uni-stuttgart.de
53 ;; [kai] - Kai Grossjohann grossjoh@linus.informatik.uni-dortmund.de
54 ;; [david] - David M. Smith dsmith@stats.adelaide.edu.au
55 ;; [christian] - Christian Egli Christian.Egli@hcsd.hac.com
56 ;; [karl] - Karl Fogel kfogel@floss.life.uiuc.edu
60 (eval-when-compile (require 'cl))
62 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
64 ;;; Customizable variables
66 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
68 (defvar imenu-auto-rescan nil
69 "*Non-nil means Imenu should always rescan the buffers.")
71 (defvar imenu-auto-rescan-maxout 60000
72 "* auto-rescan is disabled in buffers larger than this.
73 This variable is buffer-local.")
75 (defvar imenu-always-use-completion-buffer-p nil
76 "*Set this to non-nil for displaying the index in a completion buffer.
78 Non-nil means always display the index in a completion buffer.
79 Nil means display the index as a mouse menu when the mouse was
80 used to invoke `imenu'.
81 `never' means never automatically display a listing of any kind.")
83 (defvar imenu-sort-function nil
84 "*The function to use for sorting the index mouse-menu.
86 Affects only the mouse index menu.
88 Set this to nil if you don't want any sorting (faster).
89 The items in the menu are then presented in the order they were found
92 Set it to `imenu--sort-by-name' if you want alphabetic sorting.
94 The function should take two arguments and return T if the first
95 element should come before the second. The arguments are cons cells;
96 \(NAME . POSITION). Look at `imenu--sort-by-name' for an example.")
98 (defvar imenu-max-items 25
99 "*Maximum number of elements in an mouse menu for Imenu.")
101 (defvar imenu-scanning-message "Scanning buffer for index (%3d%%)"
102 "*Progress message during the index scanning of the buffer.
103 If non-nil, user gets a message during the scanning of the buffer
105 Relevant only if the mode-specific function that creates the buffer
106 index use `imenu-progress-message'.")
108 (defvar imenu-space-replacement "^"
109 "*The replacement string for spaces in index names.
110 Used when presenting the index in a completion-buffer to make the
111 names work as tokens.")
113 (defvar imenu-level-separator ":"
114 "*The separator between index names of different levels.
115 Used for making mouse-menu titles and for flattening nested indexes
116 with name concatenation.")
119 (defvar imenu-generic-expression nil
120 "The regex pattern to use for creating a buffer index.
122 If non-nil this pattern is passed to `imenu-create-index-with-pattern'
123 to create a buffer index.
125 The value should be an alist with elements that look like this:
126 (MENU-TITLE REGEXP INDEX)
128 (MENU-TITLE REGEXP INDEX FUNCTION ARGUMENTS...)
129 with zero or more ARGUMENTS. The former format creates a simple element in
130 the index alist when it matches; the latter creates a special element
131 of the form (NAME FUNCTION NAME POSITION-MARKER ARGUMENTS...)
132 with FUNCTION and ARGUMENTS beiong copied from `imenu-generic-expression'.
134 MENU-TITLE is a string used as the title for the submenu or nil if the
135 entries are not nested.
137 REGEXP is a regexp that should match a construct in the buffer that is
138 to be displayed in the menu; i.e., function or variable definitions,
139 etc. It contains a substring which is the name to appear in the
140 menu. See the info section on Regexps for more information.
142 INDEX points to the substring in REGEXP that contains the name (of the
143 function, variable or type) that is to appear in the menu.
145 For emacs-lisp-mode for example PATTERN would look like:
147 '((nil \"^\\\\s-*(def\\\\(un\\\\|subst\\\\|macro\\\\|advice\\\\)\\\\s-+\\\\([-A-Za-z0-9+]+\\\\)\" 2)
148 (\"*Vars*\" \"^\\\\s-*(def\\\\(var\\\\|const\\\\)\\\\s-+\\\\([-A-Za-z0-9+]+\\\\)\" 2)
149 (\"*Types*\" \"^\\\\s-*(def\\\\(type\\\\|struct\\\\|class\\\\|ine-condition\\\\)\\\\s-+\\\\([-A-Za-z0-9+]+\\\\)\" 2))
151 The variable is buffer-local.")
154 (make-variable-buffer-local 'imenu-generic-expression)
158 (defvar imenu-create-index-function 'imenu-default-create-index-function
159 "The function to use for creating a buffer index.
161 It should be a function that takes no arguments and returns an index
162 of the current buffer as an alist.
164 Simple elements in the alist look like (INDEX-NAME . INDEX-POSITION).
165 Special elements look like (INDEX-NAME FUNCTION ARGUMENTS...).
166 A nested sub-alist element looks like (INDEX-NAME SUB-ALIST).
167 The function `imenu--subalist-p' tests an element and returns t
168 if it is a sub-alist.
170 This function is called within a `save-excursion'.
172 The variable is buffer-local.")
173 (make-variable-buffer-local 'imenu-create-index-function)
175 (defvar imenu-prev-index-position-function 'beginning-of-defun
176 "Function for finding the next index position.
178 If `imenu-create-index-function' is set to
179 `imenu-default-create-index-function', then you must set this variable
180 to a function that will find the next index, looking backwards in the
183 The function should leave point at the place to be connected to the
184 index and it should return nil when it doesn't find another index.")
185 (make-variable-buffer-local 'imenu-prev-index-position-function)
187 (defvar imenu-extract-index-name-function nil
188 "Function for extracting the index name.
190 This function is called after the function pointed out by
191 `imenu-prev-index-position-function'.")
192 (make-variable-buffer-local 'imenu-extract-index-name-function)
194 (defun imenu--subalist-p (item)
195 (and (consp (cdr item)) (listp (cadr item))
196 (not (eq (caadr item) 'lambda))))
199 ;;; Macro to display a progress message.
200 ;;; RELPOS is the relative position to display.
201 ;;; If RELPOS is nil, then the relative position in the buffer
203 ;;; PREVPOS is the variable in which we store the last position displayed.
204 (defmacro imenu-progress-message (prevpos &optional relpos reverse)
206 imenu-scanning-message
207 (let ((pos (, (if relpos
209 (` (imenu--relative-position (, reverse)))))))
211 (` (> pos (+ 5 (, prevpos))))))
213 (message imenu-scanning-message pos)
214 (setq (, prevpos) pos)))))))
217 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
219 ;;;; Some examples of functions utilizing the framework of this
222 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
224 ;; Return the current/previous sexp and the location of the sexp (its
225 ;; beginning) without moving the point.
226 (defun imenu-example--name-and-position ()
230 (end (progn (forward-sexp) (point)))
231 (marker (make-marker)))
232 (set-marker marker beg)
233 (cons (buffer-substring beg end)
240 (defun imenu-example--lisp-extract-index-name ()
241 ;; Example of a candidate for `imenu-extract-index-name-function'.
242 ;; This will generate a flat index of definitions in a lisp file.
244 (and (looking-at "(def")
250 (end (progn (forward-sexp -1) (point))))
251 (buffer-substring beg end)))
254 (defun imenu-example--create-lisp-index ()
255 ;; Example of a candidate for `imenu-create-index-function'.
256 ;; It will generate a nested index of definitions.
257 (let ((index-alist '())
258 (index-var-alist '())
259 (index-type-alist '())
260 (index-unknown-alist '())
262 (goto-char (point-max))
263 (imenu-progress-message prev-pos 0)
264 ;; Search for the function
265 (while (beginning-of-defun)
266 (imenu-progress-message prev-pos nil t)
268 (and (looking-at "(def")
272 ((looking-at "def\\(var\\|const\\)")
274 (push (imenu-example--name-and-position)
276 ((looking-at "def\\(un\\|subst\\|macro\\|advice\\)")
278 (push (imenu-example--name-and-position)
280 ((looking-at "def\\(type\\|struct\\|class\\|ine-condition\\)")
282 (if (= (char-after (1- (point))) ?\))
287 (push (imenu-example--name-and-position)
291 (push (imenu-example--name-and-position)
292 index-unknown-alist)))))))
293 (imenu-progress-message prev-pos 100)
295 (push (cons "Variables" index-var-alist)
297 (and index-type-alist
298 (push (cons "Types" index-type-alist)
300 (and index-unknown-alist
301 (push (cons "Syntax-unknown" index-unknown-alist)
305 ;; Regular expression to find C functions
306 (defvar imenu-example--function-name-regexp-c
308 "^[a-zA-Z0-9]+[ \t]?" ; type specs; there can be no
309 "\\([a-zA-Z0-9_*]+[ \t]+\\)?" ; more than 3 tokens, right?
310 "\\([a-zA-Z0-9_*]+[ \t]+\\)?"
311 "\\([*&]+[ \t]*\\)?" ; pointer
312 "\\([a-zA-Z0-9_*]+\\)[ \t]*(" ; name
315 (defun imenu-example--create-c-index (&optional regexp)
316 (let ((index-alist '())
318 (goto-char (point-min))
319 (imenu-progress-message prev-pos 0)
320 ;; Search for the function
322 (while (re-search-forward
323 (or regexp imenu-example--function-name-regexp-c)
325 (imenu-progress-message prev-pos)
328 (goto-char (scan-sexps (point) 1))
329 (setq char (following-char)))
330 ;; Skip this function name if it is a prototype declaration.
331 (if (not (eq char ?\;))
332 (push (imenu-example--name-and-position) index-alist))))
333 (imenu-progress-message prev-pos 100)
334 (nreverse index-alist)))
337 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
339 ;;; Internal variables
341 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
343 ;; The item to use in the index for rescanning the buffer.
344 (defconst imenu--rescan-item '("*Rescan*" . -99))
346 ;; The latest buffer index.
348 (defvar imenu--index-alist nil)
349 (make-variable-buffer-local 'imenu--index-alist)
351 ;; The latest buffer index used to update the menu bar menu.
352 (defvar imenu--last-menubar-index-alist nil)
353 (make-variable-buffer-local 'imenu--last-menubar-index-alist)
355 ;; History list for 'jump-to-function-in-buffer'.
356 ;; Making this buffer local caused it not to work!
357 (defvar imenu--history-list nil)
359 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
361 ;;; Internal support functions
363 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
367 ;;; Sorts the items depending on their index name.
368 ;;; An item look like (NAME . POSITION).
370 (defun imenu--sort-by-name (item1 item2)
371 (string-lessp (car item1) (car item2)))
373 (defun imenu--relative-position (&optional reverse)
374 ;; Support function to calculate relative position in buffer
375 ;; Beginning of buffer is 0 and end of buffer is 100
376 ;; If REVERSE is non-nil then the beginning is 100 and the end is 0.
378 (total (buffer-size)))
379 (and reverse (setq pos (- total pos)))
381 ;; Avoid overflow from multiplying by 100!
382 (/ (1- pos) (max (/ total 100) 1))
383 (/ (* 100 (1- pos)) (max total 1)))))
385 ;; Split LIST into sublists of max length N.
386 ;; Example (imenu--split '(1 2 3 4 5 6 7 8) 3)-> '((1 2 3) (4 5 6) (7 8))
387 (defun imenu--split (list n)
393 (push (pop remain) sublist)
396 ;; We have finished a sublist
397 (progn (push (nreverse sublist) result)
399 (setq sublist '()))))
400 ;; There might be a sublist (if the length of LIST mod n is != 0)
401 ;; that has to be added to the result list.
403 (push (nreverse sublist) result))
406 ;;; Split the alist MENULIST into a nested alist, if it is long enough.
407 ;;; In any case, add TITLE to the front of the alist.
408 (defun imenu--split-menu (menulist title)
409 (let (keep-at-top tail)
410 (if (memq imenu--rescan-item menulist)
411 (setq keep-at-top (cons imenu--rescan-item nil)
412 menulist (delq imenu--rescan-item menulist)))
415 (if (imenu--subalist-p (car tail))
416 (setq keep-at-top (cons (car tail) keep-at-top)
417 menulist (delq (car tail) menulist)))
418 (setq tail (cdr tail)))
419 (if imenu-sort-function
424 ;; Copy list method from the cl package `copy-list'
425 (while (consp oldlist) (push (pop oldlist) res))
426 (prog1 (nreverse res) (setcdr res oldlist)))
427 imenu-sort-function)))
428 (if (> (length menulist) imenu-max-items)
434 (cons (format "From: %s" (caar menu)) menu)))
435 (imenu--split menulist imenu-max-items)))))
437 (nconc (nreverse keep-at-top) menulist))))
439 ;;; Split up each long alist that are nested within ALIST
440 ;;; into nested alists.
441 (defun imenu--split-submenus (alist)
442 (mapcar (function (lambda (elt)
446 (imenu--split-menu (cdr elt) (car elt))
451 ;;; Find all items in this buffer that should be in the index.
452 ;;; Returns an alist on the form
453 ;;; ((NAME . POSITION) (NAME . POSITION) ...)
456 (defun imenu--make-index-alist (&optional noerror)
457 ;; Create a list for this buffer only when needed.
458 (or (and imenu--index-alist
459 (or (not imenu-auto-rescan)
460 (and imenu-auto-rescan
461 (> (buffer-size) imenu-auto-rescan-maxout))))
463 (setq imenu--index-alist
465 (funcall imenu-create-index-function))))
466 (or imenu--index-alist noerror
467 (error "No items suitable for an index found in this buffer"))
468 (or imenu--index-alist
469 (setq imenu--index-alist (list nil)))
470 ;; Add a rescan option to the index.
471 (cons imenu--rescan-item imenu--index-alist))
473 ;;; Find all markers in alist and makes
474 ;;; them point nowhere.
476 (defun imenu--cleanup (&optional alist)
477 ;; Sets the markers in imenu--index-alist
479 ;; if alist is provided use that list.
481 (setq alist imenu--index-alist))
487 ((markerp (cdr item))
488 (set-marker (cdr item) nil))
489 ((imenu--subalist-p item)
490 (imenu--cleanup (cdr item))))))
494 (defun imenu--create-keymap-2 (alist counter &optional commands)
500 ((imenu--subalist-p item)
501 (append (list (setq counter (1+ counter))
502 (car item) 'keymap (car item))
503 (imenu--create-keymap-2 (cdr item) (+ counter 10) commands)))
505 (let ((end (if commands `(lambda () (interactive)
506 (imenu--menubar-select ',item))
507 (cons '(nil) item))))
509 (cons (car item) end))))
513 ;; If COMMANDS is non-nil, make a real keymap
514 ;; with a real command used as the definition.
515 ;; If it is nil, make something suitable for x-popup-menu.
516 (defun imenu--create-keymap-1 (title alist &optional commands)
517 (append (list 'keymap title) (imenu--create-keymap-2 alist 0 commands)))
520 (defun imenu--in-alist (str alist)
521 "Check whether the string STR is contained in multi-level ALIST."
522 (let (elt head tail res)
525 (setq elt (car alist)
529 ;; A nested ALIST element looks like
530 ;; (INDEX-NAME (INDEX-NAME . INDEX-POSITION) ...)
531 ;; while a bottom-level element looks like
532 ;; (INDEX-NAME . INDEX-POSITION)
533 ;; We are only interested in the bottom-level elements, so we need to
534 ;; recurse if TAIL is a list.
536 (if (setq res (imenu--in-alist str tail))
539 (setq alist nil res elt))))
542 (defun imenu-default-create-index-function ()
543 "*Wrapper for index searching functions.
545 Moves point to end of buffer and then repeatedly calls
546 `imenu-prev-index-position-function' and `imenu-extract-index-name-function'.
547 Their results are gathered into an index alist."
548 ;; These should really be done by setting imenu-create-index-function
549 ;; in these major modes. But save that change for later.
550 (cond ((and (fboundp imenu-prev-index-position-function)
551 (fboundp imenu-extract-index-name-function))
552 (let ((index-alist '())
554 (goto-char (point-max))
555 (imenu-progress-message prev-pos 0 t)
556 ;; Search for the function
557 (while (funcall imenu-prev-index-position-function)
558 (imenu-progress-message prev-pos nil t)
560 (setq name (funcall imenu-extract-index-name-function)))
562 (push (cons name (point)) index-alist)))
563 (imenu-progress-message prev-pos 100 t)
565 ;; Use generic expression if possible.
566 ((and imenu-generic-expression)
567 (imenu--generic-function imenu-generic-expression))
569 (error "The mode \"%s\" does not take full advantage of imenu.el yet."
572 (defun imenu--replace-spaces (name replacement)
573 ;; Replace all spaces in NAME with REPLACEMENT.
574 ;; That second argument should be a string.
578 (if (char-equal ch ?\ )
580 (char-to-string ch))))
584 (defun imenu--flatten-index-alist (index-alist &optional concat-names prefix)
585 ;; Takes a nested INDEX-ALIST and returns a flat index alist.
586 ;; If optional CONCAT-NAMES is non-nil, then a nested index has its
587 ;; name and a space concatenated to the names of the children.
588 ;; Third argument PREFIX is for internal use only.
592 (let* ((name (car item))
594 (new-prefix (and concat-names
596 (concat prefix imenu-level-separator name)
599 ((or (markerp pos) (numberp pos))
600 (list (cons new-prefix pos)))
602 (imenu--flatten-index-alist pos new-prefix))))))
606 ;;; Generic index gathering function.
609 (defun imenu--generic-function (patterns)
610 ;; Built on some ideas that Erik Naggum <erik@naggum.no> once posted
612 "Return an index of the current buffer as an alist.
614 PATTERN is an alist with elements that look like this: (MENU-TITLE
617 MENU-TITLE is a string used as the title for the submenu or nil if the
618 entries are not nested.
620 REGEXP is a regexp that should match a construct in the buffer that is
621 to be displayed in the menu; i.e., function or variable definitions,
622 etc. It contains a substring which is the name to appear in the
623 menu. See the info section on Regexps for more information.
625 INDEX points to the substring in REGEXP that contains the name (of the
626 function, variable or type) that is to appear in the menu.
628 For emacs-lisp-mode for example PATTERN would look like:
630 '((nil \"^\\\\s-*(def\\\\(un\\\\|subst\\\\|macro\\\\|advice\\\\)\\\\s-+\\\\([-A-Za-z0-9]+\\\\)\" 2)
631 (\"*Vars*\" \"^\\\\s-*(def\\\\(var\\\\|const\\\\)\\\\s-+\\\\([-A-Za-z0-9]+\\\\)\" 2)
632 (\"*Types*\" \"^\\\\s-*(def\\\\(type\\\\|struct\\\\|class\\\\|ine-condition\\\\)\\\\s-+\\\\([-A-Za-z0-9]+\\\\)\" 2))'
634 Returns an index of the current buffer as an alist. The elements in
635 the alist look like: (INDEX-NAME . INDEX-POSITION). They may also be
636 nested index lists like (INDEX-NAME . INDEX-ALIST) depending on
639 \(imenu--generic-function PATTERN\)."
641 (let ((index-alist (list 'dummy))
646 (function (lambda (pattern) (identity (cadr pattern))))
647 patterns "\\)\\|\\(")
651 (goto-char (point-max))
652 (imenu-progress-message prev-pos 0 t)
654 (while (re-search-backward global-regexp nil t)
655 (imenu-progress-message prev-pos nil t)
658 (goto-char (match-beginning 0))
662 (let ((menu-title (car pat))
665 (function (cadddr pat))
667 (if (and (not found) ; Only allow one entry;
669 (let ((beg (make-marker))
670 (end (match-end index)))
671 (set-marker beg (match-beginning index))
675 (buffer-substring-no-properties beg end)))
677 (nconc (list name function name beg)
681 (or (assoc menu-title index-alist)
683 (cons menu-title '())
684 index-alist))))))))))
686 (imenu-progress-message prev-pos 100 t)
687 (let ((main-element (assq nil index-alist)))
688 (nconc (delq main-element (delq 'dummy index-alist))
689 (cdr main-element)))))
691 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
693 ;;; The main functions for this package!
695 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
697 (defun imenu--completion-buffer (index-alist &optional prompt)
698 "Let the user select from INDEX-ALIST in a completion buffer with PROMPT.
700 Returns t for rescan and otherwise a position number."
701 ;; Create a list for this buffer only when needed.
703 (prepared-index-alist
707 (cons (imenu--replace-spaces (car item) imenu-space-replacement)
710 (if (eq imenu-always-use-completion-buffer-p 'never)
711 (setq name (completing-read (or prompt "Index item: ")
713 nil t nil 'imenu--history-list))
714 (save-window-excursion
715 ;; Display the completion buffer
716 (with-output-to-temp-buffer "*Completions*"
717 (display-completion-list
718 (all-completions "" prepared-index-alist )))
719 (let ((minibuffer-setup-hook
721 (let ((buffer (current-buffer)))
723 (set-buffer "*Completions*")
724 (setq completion-reference-buffer buffer)))))))
725 ;; Make a completion question
726 (setq name (completing-read (or prompt "Index item: ")
728 nil t nil 'imenu--history-list)))))
729 (cond ((not (stringp name))
731 ((string= name (car imenu--rescan-item))
734 (setq choice (assoc name prepared-index-alist))
735 (if (imenu--subalist-p choice)
736 (imenu--completion-buffer (cdr choice) prompt)
739 (defun imenu--mouse-menu (index-alist event &optional title)
740 "Let the user select from a buffer index from a mouse menu.
742 INDEX-ALIST is the buffer index and EVENT is a mouse event.
744 Returns t for rescan and otherwise an element or subelement of INDEX-ALIST."
745 (setq index-alist (imenu--split-submenus index-alist))
746 (let* ((menu (imenu--split-menu index-alist
747 (or title (buffer-name))))
749 (setq menu (imenu--create-keymap-1 (car menu)
750 (if (< 1 (length (cdr menu)))
752 (cdr (car (cdr menu))))))
753 (setq position (x-popup-menu event menu))
754 (cond ((eq position nil)
756 ;; If one call to x-popup-menu handled the nested menus,
757 ;; find the result by looking down the menus here.
758 ((and (listp position)
759 (numberp (car position))
760 (stringp (nth (1- (length position)) position)))
763 (setq final (assoc (car position) final))
764 (setq position (cdr position)))
765 (or (string= (car final) (car imenu--rescan-item))
766 (cdr (cdr (cdr final))))))
767 ;; If x-popup-menu went just one level and found a leaf item,
768 ;; return the INDEX-ALIST element for that.
769 ((and (consp position)
770 (stringp (car position))
771 (null (cdr position)))
772 (or (string= (car position) (car imenu--rescan-item))
773 (assq (car position) index-alist)))
774 ;; If x-popup-menu went just one level
775 ;; and found a non-leaf item (a submenu),
776 ;; recurse to handle the rest.
778 (imenu--mouse-menu position event
780 (concat title imenu-level-separator
781 (car (rassq position index-alist)))
782 (car (rassq position index-alist))))))))
784 (defun imenu-choose-buffer-index (&optional prompt alist)
785 "Let the user select from a buffer index and return the chosen index.
787 If the user originally activated this function with the mouse, a mouse
788 menu is used. Otherwise a completion buffer is used and the user is
789 prompted with PROMPT.
791 If you call this function with index alist ALIST, then it lets the user
794 With no index alist ALIST, it calls `imenu--make-index-alist' to
795 create the index alist.
797 If `imenu-always-use-completion-buffer-p' is non-nil, then the
798 completion buffer is always used, no matter if the mouse was used or
801 The returned value is on the form (INDEX-NAME . INDEX-POSITION)."
803 (mouse-triggered (listp last-nonmenu-event))
805 ;; If selected by mouse, see to that the window where the mouse is
806 ;; really is selected.
808 (not (equal last-nonmenu-event '(menu-bar)))
809 (let ((window (posn-window (event-start last-nonmenu-event))))
810 (or (framep window) (null window) (select-window window))))
811 ;; Create a list for this buffer only when needed.
813 (setq index-alist (if alist alist (imenu--make-index-alist)))
815 (if (and mouse-triggered
816 (not imenu-always-use-completion-buffer-p))
817 (imenu--mouse-menu index-alist last-nonmenu-event)
818 (imenu--completion-buffer index-alist prompt)))
821 (setq imenu--index-alist nil)))
825 (defun imenu-add-to-menubar (name)
826 "Adds an `imenu' entry to the menu bar for the current buffer.
827 NAME is a string used to name the menu bar item.
828 See the command `imenu' for more information."
829 (interactive "sImenu menu item name: ")
830 (let ((newmap (make-sparse-keymap))
831 (menu-bar (lookup-key (current-local-map) [menu-bar])))
832 (define-key newmap [menu-bar]
833 (append (make-sparse-keymap) menu-bar))
834 (define-key newmap [menu-bar index]
835 (cons name (nconc (make-sparse-keymap "Imenu")
836 (make-sparse-keymap))))
837 (use-local-map (append newmap (current-local-map))))
838 (add-hook 'menu-bar-update-hook 'imenu-update-menubar))
840 (defvar imenu-buffer-menubar nil)
842 (defun imenu-update-menubar ()
843 (and (current-local-map)
844 (keymapp (lookup-key (current-local-map) [menu-bar index]))
845 (let ((index-alist (imenu--make-index-alist t)))
846 ;; Don't bother updating if the index-alist has not changed
847 ;; since the last time we did it.
848 (or (equal index-alist imenu--last-menubar-index-alist)
849 (let (menu menu1 old)
850 (setq imenu--last-menubar-index-alist index-alist)
851 (setq index-alist (imenu--split-submenus index-alist))
852 (setq menu (imenu--split-menu index-alist
854 (setq menu1 (imenu--create-keymap-1 (car menu)
855 (if (< 1 (length (cdr menu)))
857 (cdr (car (cdr menu))))
859 (setq old (lookup-key (current-local-map) [menu-bar index]))
860 (setcdr old (cdr menu1)))))))
862 (defun imenu--menubar-select (item)
863 "Use Imenu to select the function or variable named in this menu item."
864 (if (equal item '("*Rescan*" . -99))
867 (setq imenu--index-alist nil)
868 (imenu-update-menubar))
872 (defun imenu (index-item)
873 "Jump to a place in the buffer chosen using a buffer menu or mouse menu.
874 See `imenu-choose-buffer-index' for more information."
876 (list (save-restriction
878 (imenu-choose-buffer-index))))
879 ;; Convert a string to an alist element.
880 (if (stringp index-item)
881 (setq index-item (assoc index-item (imenu--make-index-alist))))
886 ((markerp (cdr index-item))
887 (if (or (< (marker-position (cdr index-item)) (point-min))
888 (> (marker-position (cdr index-item)) (point-max)))
889 ;; widen if outside narrowing
891 (goto-char (marker-position (cdr index-item))))
892 ((imenu--subalist-p index-item)
893 (if (or (< (cdr index-item) (point-min))
894 (> (cdr index-item) (point-max)))
895 ;; widen if outside narrowing
897 (goto-char (cdr index-item)))
899 ;; A special item with a function.
900 (let ((function (cadr index-item))
901 (rest (cddr index-item)))
902 (apply function (car index-item) rest)))))))
906 ;;; imenu.el ends here