home *** CD-ROM | disk | FTP | other *** search
- ;;; imenu.el --- Framework for mode-specific buffer indexes.
-
- ;; Copyright (C) 1994 Free Software Foundation, Inc.
-
- ;; Author: Ake Stenhoff <etxaksf@aom.ericsson.se>
- ;; Lars Lindberg <lli@sypro.cap.se>
- ;; Created: 8 Feb 1994
- ;; Version: 1.7
- ;; Keywords: tools
- ;;
- ;; This program 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.
- ;;
- ;; This program 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 this program; if not, write to the Free Software
- ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Commentary:
- ;;
- ;; Purpose of this package:
- ;; To present a framework for mode-specific buffer indexes.
- ;; A buffer index is an alist of names and buffer positions.
- ;; For instance all functions in a C-file and their positions.
- ;;
- ;; How it works:
-
- ;; A mode-specific function is called to generate the index. It is
- ;; then presented to the user, who can choose from this index.
- ;;
- ;; The package comes with a set of example functions for how to
- ;; utilize this package.
-
- ;; There are *examples* for index gathering functions for C/C++ and
- ;; Lisp/Emacs Lisp but it is easy to customize for other modes. A
- ;; function for jumping to the chosen index position is also
- ;; supplied.
-
- ;;; Change Log:
- ;; v1.7 Apr 12 1994 Ake Stenhoff
- ;; Changed doc strings refering to symbols.
- ;; Require 'cl' when compiling only.
- ;; Only uses 'cl' macros.
- ;; v1.6 Feb 28 1994 Ake Stenhoff
- ;; Added alist as an optional argument to
- ;; 'imenu-choose-buffer-index'.
- ;; Thanks [dean].
- ;; v1.5 Feb 25 1994 Ake Stenhoff
- ;; Added code to parse DEFSTRUCT, DEFCLASS, DEFTYPE,
- ;; DEFINE-CONDITION in the lisp example function.
- ;; Thanks [simon].
- ;; v1.4 Feb 18 1994 Ake Stenhoff
- ;; Added 'imenu-create-submenu-name' for creating a submenu name.
- ;; This is for getting a general look of submenu names.
- ;; Added variable 'imenu-submenu-name-format' used by
- ;; 'imenu-create-submenu-name'.
- ;; v1.3 Feb 17 1994 Lars Lindberg
- ;; Added 'imenu--flatten-index-alist' for flatten nexted index
- ;; alists.
- ;; New examples for lisp mode that utilizes the features better.
- ;; Added the variable 'imenu-space-replacement'.
- ;; The completion-buffer version of the index menu now replaces
- ;; spaces in the index-names to make tokens of them.
- ;; v1.2 Feb 14 1994 Ake Stenhoff & Lars Lindberg
- ;; Now handles nested index lists.
- ;; v1.1 Feb 9 1994 Ake Stenhoff & Lars Lindberg
- ;; Better comments (?).
- ;; v1.0 Feb 8 1994 Ake Stenhoff & Lars Lindberg
- ;; Based on func-menu.el 3.5.
-
- ;;; Thanks goes to
- ;; [simon] - Simon Leinen simon@lia.di.epfl.ch
- ;; [dean] - Dean Andrews ada@unison.com
- ;;
-
- ;;; Code
- (eval-when-compile (require 'cl))
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;
- ;;; Customizable variables
- ;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defvar imenu-always-use-completion-buffer-p nil
- "*Set this to non-nil for displaying the index in a completion buffer.
-
- Non-nil means always display the index in a completion buffer.
- Nil means display the index as a mouse menu when the mouse was
- used to invoke `imenu'.")
-
- (defvar imenu-sort-function nil
- "*The function to use for sorting the index mouse-menu.
-
- Affects only the mouse index menu.
-
- Set this to nil if you don't want any sorting (faster).
- The items in the menu are then presented in the order they were found
- in the buffer.
-
- Set it to `imenu--sort-by-name' if you want alphabetic sorting.
-
- The function should take two arguments and return T if the first
- element should come before the second. The arguments are cons cells;
- \(NAME . POSITION). Look at `imenu--sort-by-name' for an example.")
-
- (defvar imenu-max-items 25
- "*Maximum number of elements in an index mouse-menu.")
-
- (defvar imenu-scanning-message "Scanning buffer for index. (%3d%%)"
- "*Progress message during the index scanning of the buffer.
- If non NIL, user gets a message during the scanning of the buffer
-
- Relevant only if the mode-specific function that creates the buffer
- index use `imenu-progress-message'.")
-
- (defvar imenu-space-replacement "^"
- "*The replacement string for spaces in index names.
- Used when presenting the index in a completion-buffer to make the
- names work as tokens.")
-
- (defvar imenu-level-separator ":"
- "*The separator between index names of different levels.
- Used for making mouse-menu titles and for flattening nested indexes
- with name concatenation.")
-
- (defvar imenu-submenu-name-format "%s..."
- "*The format for making a submenu name.")
-
- ;;;; Hooks
-
- (defvar imenu-create-index-function 'imenu-default-create-index-function
- "The function to use for creating a buffer index.
-
- It should be a function that takes no arguments and returns an index
- of the current buffer as an alist. The elements in the alist look
- like: (INDEX-NAME . INDEX-POSITION). You may also nest index list like
- \(INDEX-NAME . INDEX-ALIST).
-
- This function is called within a `save-excursion'.
-
- The variable is buffer-local.")
- (make-variable-buffer-local 'imenu-create-index-function)
-
- (defvar imenu-prev-index-position-function 'beginning-of-defun
- "Function for finding the next index position.
-
- If `imenu-create-index-function' is set to
- `imenu-default-create-index-function', then you must set this variable
- to a function that will find the next index, looking backwards in the
- file.
-
- The function should leave point at the place to be connected to the
- index and it should return nil when it doesn't find another index. ")
- (make-variable-buffer-local 'imenu-prev-index-position-function)
-
- (defvar imenu-extract-index-name-function nil
- "Function for extracting the index name.
-
- This function is called after the function pointed out by
- `imenu-prev-index-position-function'.")
- (make-variable-buffer-local 'imenu-extract-index-name-function)
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;
- ;;; Internal variables
- ;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- ;; The item to use in the index for rescanning the buffer.
- (defconst imenu--rescan-item '("*Rescan*" . -99))
-
- ;; The latest buffer index.
- ;; Buffer local.
- (defvar imenu--index-alist nil)
- (make-variable-buffer-local 'imenu--index-alist)
-
- ;; History list for 'jump-to-function-in-buffer'.
- ;; Buffer local.
- (defvar imenu--history-list nil)
- (make-variable-buffer-local 'imenu--history-list)
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;
- ;;; Internal support functions
- ;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- ;;;
- ;;; Sort function
- ;;; Sorts the items depending on their index name.
- ;;; An item look like (NAME . POSITION).
- ;;;
- (defun imenu--sort-by-name (item1 item2)
- (string-lessp (car item1) (car item2)))
-
- (defun imenu--relative-position (&optional reverse)
- ;; Support function to calculate relative position in buffer
- ;; Beginning of buffer is 0 and end of buffer is 100
- ;; If REVERSE is non-nil then the beginning is 100 and the end is 0.
- (let ((pos (point))
- (total (buffer-size)))
- (and reverse (setq pos (- total pos)))
- (if (> total 50000)
- ;; Avoid overflow from multiplying by 100!
- (/ (1- pos) (max (/ total 100) 1))
- (/ (* 100 (1- pos)) (max total 1)))))
-
- ;;;
- ;;; Macro to display a progress message. This will probably be used
- ;;; in a tight loop, that is why we use a macro.
- ;;; RELPOS is the relative position to display.
- ;;; If RELPOS is nil, then the relative position in the buffer
- ;;; is calculated.
- (defmacro imenu-progress-message (&optional relpos reverse)
- (` (and
- imenu-scanning-message
- (message imenu-scanning-message
- (, (if relpos
- relpos
- (` (imenu--relative-position (, reverse)))))))))
-
- ;;;
- ;;; Function for suporting general looking submenu names.
- ;;; Uses `imenu-submenu-name-format' for creating the name.
- ;;; NAME is the base of the new submenu name.
- ;;;
- (defun imenu-create-submenu-name (name)
- (format imenu-submenu-name-format name))
-
- ;; Split LIST into sublists of max length N.
- ;; Example (imenu--split '(1 2 3 4 5 6 7 8) 3)-> '((1 2 3) (4 5 6) (7 8))
- (defun imenu--split (list n)
- (let ((remain list)
- (result '())
- (sublist '())
- (i 0))
- (while remain
- (push (pop remain) sublist)
- (incf i)
- (and (= i n)
- ;; We have finished a sublist
- (progn (push (nreverse sublist) result)
- (setq i 0)
- (setq sublist '()))))
- ;; There might be a sublist (if the length of LIST mod n is != 0)
- ;; that has to be added to the result list.
- (and sublist
- (push (nreverse sublist) result))
- (nreverse result)))
-
- ;;;
- ;;; Split a menu in to several menus.
- ;;;
- (defun imenu--split-menu (menulist title)
- (cons "Function menus"
- (mapcar
- (function
- (lambda (menu)
- (cons (format "(%s)" title) menu)))
- (imenu--split menulist imenu-max-items))))
-
- ;;;
- ;;; Find all items in this buffer that should be in the index.
- ;;; Returns an alist on the form
- ;;; ((NAME . POSITION) (NAME . POSITION) ...)
- ;;;
-
- (defun imenu--make-index-alist ()
- ;; Create a list for this buffer only when needed.
- (or imenu--index-alist
- ;; Get the index
- (setq imenu--index-alist
- (save-excursion
- (funcall imenu-create-index-function))))
- (or imenu--index-alist
- (error "No items suitable for an index found in this buffer."))
- ;; Add a rescan option to the index.
- (cons imenu--rescan-item imenu--index-alist))
-
- (defun imenu-default-create-index-function ()
- "*Wrapper for index searching functions.
-
- Moves point to end of buffer and then repeatedly calls
- `imenu-prev-index-position-function' and `imenu-extract-index-name-function'.
- Their results are gathered into an index alist."
- ;; These should really be done by setting imenu-create-index-function
- ;; in these major modes. But save that change for later.
- (cond ((eq major-mode 'emacs-lisp-mode)
- (imenu-example--create-lisp-index))
- ((eq major-mode 'lisp-mode)
- (imenu-example--create-lisp-index))
- ((eq major-mode 'c++-mode)
- (imenu-example--create-c++-index))
- ((eq major-mode 'c-mode)
- (imenu-example--create-c-index))
- (t
- (or (and (fboundp imenu-prev-index-position-function)
- (fboundp imenu-extract-index-name-function))
- (error "The mode \"%s\" does not take full advantage of imenu.el yet."
- mode-name))
- (let ((index-alist '())
- name)
- (goto-char (point-max))
- (imenu-progress-message 0 t)
- ;; Search for the function
- (while (funcall imenu-prev-index-position-function)
- (imenu-progress-message nil t)
- (save-excursion
- (setq name (funcall imenu-extract-index-name-function)))
- (and (stringp name)
- (push (cons name (point)) index-alist)))
- (imenu-progress-message 100 t)
- index-alist))))
-
- (defun imenu--replace-spaces (name replacement)
- ;; Replace all spaces in NAME with REPLACEMENT.
- ;; That second argument should be a string.
- (mapconcat
- (function
- (lambda (ch)
- (if (char-equal ch ?\ )
- replacement
- (char-to-string ch))))
- name
- ""))
-
- (defun imenu--flatten-index-alist (index-alist &optional concat-names prefix)
- ;; Takes a nested INDEX-ALIST and returns a flat index alist.
- ;; If optional CONCAT-NAMES is non-nil, then a nested index has its
- ;; name and a space concatenated to the names of the children.
- ;; Third argument PREFIX is for internal use only.
- (mapcan
- (function
- (lambda (item)
- (let* ((name (car item))
- (pos (cdr item))
- (new-prefix (and concat-names
- (if prefix
- (concat prefix imenu-level-separator name)
- name))))
- (cond
- ((numberp pos)
- (list (cons new-prefix pos)))
- (t
- (imenu--flatten-index-alist pos new-prefix))))))
- index-alist))
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;
- ;;; The main functions for this package!
- ;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (defun imenu--completion-buffer (index-alist &optional prompt)
- "Let the user select from INDEX-ALIST in a completion buffer with PROMPT.
-
- Returns t for rescan and otherwise a position number."
- ;; Create a list for this buffer only when needed.
- (let (name choice
- (prepared-index-alist
- (mapcar
- (function
- (lambda (item)
- (cons (imenu--replace-spaces (car item) imenu-space-replacement)
- (cdr item))))
- index-alist)))
- (save-window-excursion
- ;; Display the completion buffer
- (with-output-to-temp-buffer "*Completions*"
- (display-completion-list
- (all-completions "" prepared-index-alist )))
- (let ((minibuffer-setup-hook
- (function (lambda ()
- (let ((buffer (current-buffer)))
- (save-excursion
- (set-buffer "*Completions*")
- (setq completion-reference-buffer buffer)))))))
- ;; Make a completion question
- (setq name (completing-read (or prompt "Index item: ")
- prepared-index-alist
- nil t nil 'imenu--history-list))))
- (cond ((not (stringp name))
- nil)
- ((string= name (car imenu--rescan-item))
- t)
- (t
- (setq choice (assoc name prepared-index-alist))
- (if (listp (cdr choice))
- (imenu--completion-buffer (cdr choice) prompt)
- choice)))))
-
- (defun imenu--mouse-menu (index-alist event &optional title)
- "Let the user select from a buffer index from a mouse menu.
-
- INDEX-ALIST is the buffer index and EVENT is a mouse event.
-
- Returns t for rescan and otherwise a position number."
- (let* ((menu (imenu--split-menu
- (if imenu-sort-function
- (sort
- (let ((res nil)
- (oldlist index-alist))
- ;; Copy list method from the cl package `copy-list'
- (while (consp oldlist) (push (pop oldlist) res))
- (prog1 (nreverse res) (setcdr res oldlist)))
- imenu-sort-function)
- index-alist)
- (or title (buffer-name))))
- position)
- (setq position (x-popup-menu event menu))
- (cond
- ((eq position nil)
- position)
- ((listp position)
- (imenu--mouse-menu position event
- (if title
- (concat title imenu-level-separator
- (car (rassq position index-alist)))
- (car (rassq position index-alist)))))
- ((= position (cdr imenu--rescan-item))
- t)
- (t
- (rassq position index-alist)))))
-
- (defun imenu-choose-buffer-index (&optional prompt alist)
- "Let the user select from a buffer index and return the chosen index.
-
- If the user originally activated this function with the mouse, a mouse
- menu is used. Otherwise a completion buffer is used and the user is
- prompted with PROMPT.
-
- If you call this function with index alist ALIST, then it lets the user
- select from ALIST.
-
- With no index alist ALIST, it calls `imenu--make-index-alist' to
- create the index alist.
-
- If `imenu-always-use-completion-buffer-p' is non-nil, then the
- completion buffer is always used, no matter if the mouse was used or
- not.
-
- The returned value is on the form (INDEX-NAME . INDEX-POSITION)."
- (let (index-alist
- (mouse-triggered (listp last-command-event))
- (result t) )
- ;; If selected by mouse, see to that the window where the mouse is
- ;; really is selected.
- (and mouse-triggered
- (let ((window (posn-window (event-start last-command-event))))
- (or (framep window) (select-window window))))
- ;; Create a list for this buffer only when needed.
- (while (eq result t)
- (setq index-alist (if alist alist (imenu--make-index-alist)))
- (setq result
- (if (and mouse-triggered
- (not imenu-always-use-completion-buffer-p))
- (imenu--mouse-menu index-alist last-command-event)
- (imenu--completion-buffer index-alist prompt)))
- (and (eq result t)
- (setq imenu--index-alist nil)))
- result))
-
- ;;;###autoload
- (defun imenu ()
- "Jump to a place in the buffer chosen using a buffer menu or mouse menu.
- See `imenu-choose-buffer-index' for more information."
- (interactive)
- (let ((index-item (imenu-choose-buffer-index)))
- (and index-item
- (progn
- (push-mark)
- (goto-char (cdr index-item))))))
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;;;
- ;;;; Some examples of functions utilizing the framework of this
- ;;;; package.
- ;;;;
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- ;; Return the current/previous sexp and the location of the sexp (it's
- ;; beginning) without moving the point.
- (defun imenu-example--name-and-position ()
- (save-excursion
- (forward-sexp -1)
- (let ((beg (point))
- (end (progn (forward-sexp) (point))))
- (cons (buffer-substring beg end)
- beg))))
-
- ;;;
- ;;; Lisp
- ;;;
-
- (defun imenu-example--lisp-extract-index-name ()
- ;; Example of a candidate for `imenu-extract-index-name-function'.
- ;; This will generate a flat index of definitions in a lisp file.
- (save-match-data
- (and (looking-at "(def")
- (condition-case nil
- (progn
- (down-list 1)
- (forward-sexp 2)
- (let ((beg (point))
- (end (progn (forward-sexp -1) (point))))
- (buffer-substring beg end)))
- (error nil)))))
-
- (defun imenu-example--create-lisp-index ()
- ;; Example of a candidate for `imenu-create-index-function'.
- ;; It will generate a nested index of definitions.
- (let ((index-alist '())
- (index-var-alist '())
- (index-type-alist '())
- (index-unknown-alist '()))
- (goto-char (point-max))
- (imenu-progress-message 0)
- ;; Search for the function
- (while (beginning-of-defun)
- (imenu-progress-message nil t)
- (save-match-data
- (and (looking-at "(def")
- (save-excursion
- (down-list 1)
- (cond
- ((looking-at "def\\(var\\|const\\)")
- (forward-sexp 2)
- (push (imenu-example--name-and-position)
- index-var-alist))
- ((looking-at "def\\(un\\|subst\\|macro\\|advice\\)")
- (forward-sexp 2)
- (push (imenu-example--name-and-position)
- index-alist))
- ((looking-at "def\\(type\\|struct\\|class\\|ine-condition\\)")
- (forward-sexp 2)
- (if (= (char-after (1- (point))) ?\))
- (progn
- (forward-sexp -1)
- (down-list 1)
- (forward-sexp 1)))
- (push (imenu-example--name-and-position)
- index-type-alist))
- (t
- (forward-sexp 2)
- (push (imenu-example--name-and-position)
- index-unknown-alist)))))))
- (imenu-progress-message 100)
- (and index-var-alist
- (push (cons (imenu-create-submenu-name "Variables") index-var-alist)
- index-alist))
- (and index-type-alist
- (push (cons (imenu-create-submenu-name "Types") index-type-alist)
- index-alist))
- (and index-unknown-alist
- (push (cons (imenu-create-submenu-name "Syntax-unknown") index-unknown-alist)
- index-alist))
- index-alist))
-
-
- ;;;
- ;;; C
- ;;;
- ;; Regular expression to find C functions
- (defvar imenu-example--function-name-regexp-c
- (concat
- "^[a-zA-Z0-9]+[ \t]?" ; type specs; there can be no
- "\\([a-zA-Z0-9_*]+[ \t]+\\)?" ; more than 3 tokens, right?
- "\\([a-zA-Z0-9_*]+[ \t]+\\)?"
- "\\([*&]+[ \t]*\\)?" ; pointer
- "\\([a-zA-Z0-9_*]+\\)[ \t]*(" ; name
- ))
-
- (defun imenu-example--create-c-index (&optional regexp)
- (let ((index-alist '())
- (char))
- (goto-char (point-min))
- (imenu-progress-message 0)
- ;; Search for the function
- (save-match-data
- (while (re-search-forward
- (or regexp imenu-example--function-name-regexp-c)
- nil t)
- (imenu-progress-message)
- (backward-up-list 1)
- (save-excursion
- (goto-char (scan-sexps (point) 1))
- (setq char (following-char)))
- ;; Skip this function name if it is a prototype declaration.
- (if (not (eq char ?\;))
- (push (imenu-example--name-and-position) index-alist))))
- (imenu-progress-message 100)
- (nreverse index-alist)))
-
- ;;;
- ;;; C++
- ;;;
- ;; Regular expression to find C++ functions
- (defvar imenu-example--function-name-regexp-c++
- (concat
- "^[a-zA-Z0-9:]+[ \t]?" ; type specs; there can be no
- "\\([a-zA-Z0-9_:~*]+[ \t]+\\)?" ; more than 3 tokens, right?
- "\\([a-zA-Z0-9_:~*]+[ \t]+\\)?"
- "\\([*&]+[ \t]*\\)?" ; pointer
- "\\([a-zA-Z0-9_:*]+\\)[ \t]*(" ; name
- ))
- (defun imenu-example--create-c++-index ()
- (imenu-example--create-c-index imenu-example--function-name-regexp-c++))
-
- (provide 'imenu)
-
- ;;; imenu.el ends here
-