mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-23 07:19:15 +00:00
276 lines
10 KiB
EmacsLisp
276 lines
10 KiB
EmacsLisp
;;; which-func.el --- print current function in mode line
|
|
|
|
;; Copyright (C) 1994, 1997, 1998, 2001, 2003 Free Software Foundation, Inc.
|
|
|
|
;; Author: Alex Rezinsky <alexr@msil.sps.mot.com>
|
|
;; (doesn't seem to be responsive any more)
|
|
;; Keywords: mode-line, imenu, tools
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This package prints name of function where your current point is
|
|
;; located in mode line. It assumes that you work with imenu package
|
|
;; and imenu--index-alist is up to date.
|
|
|
|
;; KNOWN BUGS
|
|
;; ----------
|
|
;; Really this package shows not "function where the current point is
|
|
;; located now", but "nearest function which defined above the current
|
|
;; point". So if your current point is located after end of function
|
|
;; FOO but before begin of function BAR, FOO will be displayed in mode
|
|
;; line.
|
|
;; - if two windows display the same buffer, both windows
|
|
;; show the same `which-func' information.
|
|
|
|
;; TODO LIST
|
|
;; ---------
|
|
;; 1. Dependence on imenu package should be removed. Separate
|
|
;; function determination mechanism should be used to determine the end
|
|
;; of a function as well as the beginning of a function.
|
|
;; 2. This package should be realized with the help of overlay
|
|
;; properties instead of imenu--index-alist variable.
|
|
|
|
;;; History:
|
|
|
|
;; THANKS TO
|
|
;; ---------
|
|
;; Per Abrahamsen <abraham@iesd.auc.dk>
|
|
;; Some ideas (inserting in mode-line, using of post-command hook
|
|
;; and toggling this mode) have been borrowed from his package
|
|
;; column.el
|
|
;; Peter Eisenhauer <pipe@fzi.de>
|
|
;; Bug fixing in case nested indexes.
|
|
;; Terry Tateyama <ttt@ursa0.cs.utah.edu>
|
|
;; Suggestion to use find-file-hook for first imenu
|
|
;; index building.
|
|
|
|
;;; Code:
|
|
|
|
;; Variables for customization
|
|
;; ---------------------------
|
|
;;
|
|
(defvar which-func-unknown "???"
|
|
"String to display in the mode line when current function is unknown.")
|
|
|
|
(defgroup which-func nil
|
|
"Mode to display the current function name in the modeline."
|
|
:group 'tools
|
|
:version "20.3")
|
|
|
|
(defcustom which-func-modes
|
|
'(emacs-lisp-mode c-mode c++-mode perl-mode cperl-mode makefile-mode
|
|
sh-mode fortran-mode f90-mode ada-mode)
|
|
"List of major modes for which Which Function mode should be used.
|
|
For other modes it is disabled. If this is equal to t,
|
|
then Which Function mode is enabled in any major mode that supports it."
|
|
:group 'which-func
|
|
:type '(choice (const :tag "All modes" t)
|
|
(repeat (symbol :tag "Major mode"))))
|
|
|
|
(defcustom which-func-non-auto-modes nil
|
|
"List of major modes where Which Function mode is inactive till Imenu is used.
|
|
This means that Which Function mode won't really do anything
|
|
until you use Imenu, in these modes. Note that files
|
|
larger than `which-func-maxout' behave in this way too;
|
|
Which Function mode doesn't do anything until you use Imenu."
|
|
:group 'which-func
|
|
:type '(repeat (symbol :tag "Major mode")))
|
|
|
|
(defcustom which-func-maxout 500000
|
|
"Don't automatically compute the Imenu menu if buffer is this big or bigger.
|
|
Zero means compute the Imenu menu regardless of size."
|
|
:group 'which-func
|
|
:type 'integer)
|
|
|
|
(defcustom which-func-format '("[" which-func-current "]")
|
|
"Format for displaying the function in the mode line."
|
|
:group 'which-func
|
|
:type 'sexp)
|
|
;;;###autoload (put 'which-func-format 'risky-local-variable t)
|
|
|
|
(defvar which-func-cleanup-function nil
|
|
"Function to transform a string before displaying it in the mode line.
|
|
The function is called with one argument, the string to display.
|
|
Its return value is displayed in the modeline.
|
|
If nil, no function is called. The default value is nil.
|
|
|
|
This feature can be useful if Imenu is set up to make more
|
|
detailed entries (e.g., containing the argument list of a function),
|
|
and you want to simplify them for the mode line
|
|
\(e.g., removing the parameter list to just have the function name.)")
|
|
|
|
;;; Code, nothing to customize below here
|
|
;;; -------------------------------------
|
|
;;;
|
|
(require 'imenu)
|
|
|
|
(defvar which-func-table (make-hash-table :test 'eq :weakness 'key))
|
|
|
|
(defconst which-func-current
|
|
'(:eval (gethash (selected-window) which-func-table which-func-unknown)))
|
|
;;;###autoload (put 'which-func-current 'risky-local-variable t)
|
|
|
|
(defvar which-func-mode nil
|
|
"Non-nil means display current function name in mode line.
|
|
This makes a difference only if `which-function-mode' is non-nil.")
|
|
(make-variable-buffer-local 'which-func-mode)
|
|
;;(put 'which-func-mode 'permanent-local t)
|
|
|
|
(add-hook 'find-file-hook 'which-func-ff-hook t)
|
|
|
|
(defun which-func-ff-hook ()
|
|
"File find hook for Which Function mode.
|
|
It creates the Imenu index for the buffer, if necessary."
|
|
(setq which-func-mode
|
|
(and which-function-mode
|
|
(or (eq which-func-modes t)
|
|
(member major-mode which-func-modes))))
|
|
|
|
(condition-case nil
|
|
(if (and which-func-mode
|
|
(not (member major-mode which-func-non-auto-modes))
|
|
(or (null which-func-maxout)
|
|
(< buffer-saved-size which-func-maxout)
|
|
(= which-func-maxout 0)))
|
|
(setq imenu--index-alist
|
|
(save-excursion (funcall imenu-create-index-function))))
|
|
(error
|
|
(setq which-func-mode nil))))
|
|
|
|
(defun which-func-update ()
|
|
;; "Update the Which-Function mode display for all windows."
|
|
;; (walk-windows 'which-func-update-1 nil 'visible))
|
|
(which-func-update-1 (selected-window)))
|
|
|
|
(defun which-func-update-1 (window)
|
|
"Update the Which-Function mode display for window WINDOW."
|
|
(with-selected-window window
|
|
(when which-func-mode
|
|
(condition-case info
|
|
(let ((current (which-function)))
|
|
(unless (equal current (gethash window which-func-table))
|
|
(puthash window current which-func-table)
|
|
(force-mode-line-update)))
|
|
(error
|
|
(which-func-mode -1)
|
|
(error "Error in which-func-update: %s" info))))))
|
|
|
|
;;;###autoload
|
|
(defalias 'which-func-mode 'which-function-mode)
|
|
|
|
(defvar which-func-update-timer nil)
|
|
|
|
;; This is the name people would normally expect.
|
|
;;;###autoload
|
|
(define-minor-mode which-function-mode
|
|
"Toggle Which Function mode, globally.
|
|
When Which Function mode is enabled, the current function name is
|
|
continuously displayed in the mode line, in certain major modes.
|
|
|
|
With prefix ARG, turn Which Function mode on iff arg is positive,
|
|
and off otherwise."
|
|
:global t :group 'which-func
|
|
(if which-function-mode
|
|
;;Turn it on
|
|
(progn
|
|
(setq which-func-update-timer
|
|
(run-with-idle-timer idle-update-delay t 'which-func-update))
|
|
(dolist (buf (buffer-list))
|
|
(with-current-buffer buf
|
|
(setq which-func-mode
|
|
(or (eq which-func-modes t)
|
|
(member major-mode which-func-modes))))))
|
|
;; Turn it off
|
|
(when (timerp which-func-update-timer)
|
|
(cancel-timer which-func-update-timer))
|
|
(setq which-func-update-timer nil)
|
|
(dolist (buf (buffer-list))
|
|
(with-current-buffer buf (setq which-func-mode nil)))))
|
|
|
|
(defvar which-function-imenu-failed nil
|
|
"Locally t in a buffer if `imenu--make-index-alist' found nothing there.")
|
|
|
|
(defvar which-func-functions nil
|
|
"List of functions for `which-function' to call with no arguments.
|
|
It calls them sequentially, and if any returns non-nil,
|
|
`which-function' uses that name and stops looking for the name.")
|
|
|
|
(defun which-function ()
|
|
"Return current function name based on point.
|
|
Uses `which-function-functions', `imenu--index-alist'
|
|
or `add-log-current-defun-function'.
|
|
If no function name is found, return nil."
|
|
(let (name)
|
|
;; Try the which-function-functions functions first.
|
|
(let ((hooks which-func-functions))
|
|
(while hooks
|
|
(let ((value (funcall (car hooks))))
|
|
(when value
|
|
(setq name value
|
|
hooks nil)))
|
|
(setq hooks (cdr hooks))))
|
|
|
|
;; If Imenu is loaded, try to make an index alist with it.
|
|
(when (and (null name)
|
|
(boundp 'imenu--index-alist) (null imenu--index-alist)
|
|
(null which-function-imenu-failed))
|
|
(imenu--make-index-alist)
|
|
(unless imenu--index-alist
|
|
(make-local-variable 'which-function-imenu-failed)
|
|
(setq which-function-imenu-failed t)))
|
|
;; If we have an index alist, use it.
|
|
(when (and (null name)
|
|
(boundp 'imenu--index-alist) imenu--index-alist)
|
|
(let ((alist imenu--index-alist)
|
|
(minoffset (point-max))
|
|
offset elem pair mark)
|
|
(while alist
|
|
(setq elem (car-safe alist)
|
|
alist (cdr-safe alist))
|
|
;; Elements of alist are either ("name" . marker), or
|
|
;; ("submenu" ("name" . marker) ... ).
|
|
(unless (listp (cdr elem))
|
|
(setq elem (list elem)))
|
|
(while elem
|
|
(setq pair (car elem)
|
|
elem (cdr elem))
|
|
(and (consp pair)
|
|
(number-or-marker-p (setq mark (cdr pair)))
|
|
(if (>= (setq offset (- (point) mark)) 0)
|
|
(if (< offset minoffset) ; find the closest item
|
|
(setq minoffset offset
|
|
name (car pair)))
|
|
;; Entries in order, so can skip all those after point.
|
|
(setq elem nil)))))))
|
|
;; Try using add-log support.
|
|
(when (and (null name) (boundp 'add-log-current-defun-function)
|
|
add-log-current-defun-function)
|
|
(setq name (funcall add-log-current-defun-function)))
|
|
;; Filter the name if requested.
|
|
(when name
|
|
(if which-func-cleanup-function
|
|
(funcall which-func-cleanup-function name)
|
|
name))))
|
|
|
|
(provide 'which-func)
|
|
|
|
;;; arch-tag: fa8a55c7-bfe3-4ffc-95ab-01bf21796827
|
|
;;; which-func.el ends here
|