;;; semantic-util-modes.el --- Semantic minor modes

;;; Copyright (C) 2000, 2001, 2002, 2003, 2004 Eric M. Ludlam
;;; Copyright (C) 2001 David Ponce

;; Author: Eric M. Ludlam <zappo@gnu.org>
;; Author: David Ponce <david@dponce.com>
;; Keywords: syntax
;; X-RCS: $Id: semantic-util-modes.el,v 1.50 2004/06/28 13:33:46 zappo Exp $

;; This file is not part of GNU Emacs.

;; Semantic 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 software 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:
;;
;;  Semantic utility minor modes.
;;

;;; Code:
(require 'working)
(require 'semantic)

(eval-when-compile
  (require 'semantic-decorate)
  )

;;; Compatibility
(if (fboundp 'propertize)
    (defalias 'semantic-propertize 'propertize)
  (defsubst semantic-propertize (string &rest properties)
    "Return a copy of STRING with text properties added.
Dummy implementation for compatibility which just return STRING and
ignore PROPERTIES."
    string)
  )

;;; Group for all semantic enhancing modes 
(defgroup semantic-modes nil
  "Minor modes associated with the Semantic architecture."
  :group 'semantic)

;;;;
;;;; Semantic minor modes stuff
;;;;
(defcustom semantic-update-mode-line t
  "*If non-nil, show enabled minor modes in the mode line.
Only minor modes that are not turned on globally are shown in the mode
line."
  :group 'semantic
  :type 'boolean
  :require 'semantic-util-modes
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (set-default sym val)
         ;; Update status of all Semantic enabled buffers
         (semantic-map-buffers
          #'semantic-mode-line-update)))

(defcustom semantic-mode-line-prefix
  (semantic-propertize "S" 'face 'bold)
  "*Prefix added to minor mode indicators in the mode line."
  :group 'semantic
  :type 'string
  :require 'semantic-util-modes
  :initialize 'custom-initialize-default)

(defvar semantic-minor-modes-status nil
  "String showing Semantic minor modes which are locally enabled.
It is displayed in the mode line.")
(make-variable-buffer-local 'semantic-minor-modes-status)

(defvar semantic-minor-mode-alist nil
  "Alist saying how to show Semantic minor modes in the mode line.
Like variable `minor-mode-alist'.")

(defun semantic-mode-line-update ()
  "Update display of Semantic minor modes in the mode line.
Only minor modes that are locally enabled are shown in the mode line."
  (setq semantic-minor-modes-status nil)
  (if semantic-update-mode-line
      (let ((ml semantic-minor-mode-alist)
            mm ms see)
        (while ml
          (setq mm (car ml)
                ms (cadr mm)
                mm (car mm)
                ml (cdr ml))
          (when (and (symbol-value mm)
                     ;; Only show local minor mode status
                     (not (memq mm semantic-init-hooks)))
            (and ms
                 (symbolp ms)
                 (setq ms (symbol-value ms)))
            (and (stringp ms)
                 (not (member ms see)) ;; Don't duplicate same status
                 (setq see (cons ms see)
                       ms (if (string-match "^[ ]*\\(.+\\)" ms)
                              (match-string 1 ms)))
                 (setq semantic-minor-modes-status
                       (if semantic-minor-modes-status
                           (concat semantic-minor-modes-status "/" ms)
                         ms)))))
        (if semantic-minor-modes-status
            (setq semantic-minor-modes-status
                  (concat
                   " "
                   (if (string-match "^[ ]*\\(.+\\)"
                                     semantic-mode-line-prefix)
                       (match-string 1 semantic-mode-line-prefix)
                     "S")
                   "/"
                   semantic-minor-modes-status)))))
  (working-mode-line-update))

(defun semantic-add-minor-mode (toggle name &optional keymap)
  "Register a new Semantic minor mode.
TOGGLE is a symbol which is the name of a buffer-local variable that
is toggled on or off to say whether the minor mode is active or not.
It is also an interactive function to toggle the mode.

NAME specifies what will appear in the mode line when the minor mode
is active.  NAME should be either a string starting with a space, or a
symbol whose value is such a string.

Optional KEYMAP is the keymap for the minor mode that will be added to
`minor-mode-map-alist'."
  ;; Add a dymmy semantic minor mode to display the status
  (or (assq 'semantic-minor-modes-status minor-mode-alist)
      (setq minor-mode-alist (cons (list 'semantic-minor-modes-status
                                         'semantic-minor-modes-status)
                                   minor-mode-alist)))
  (if (fboundp 'add-minor-mode)
      ;; Emacs 21 & XEmacs
      (add-minor-mode toggle "" keymap)
    ;; Emacs 20
    (or (assq toggle minor-mode-alist)
        (setq minor-mode-alist (cons (list toggle "") minor-mode-alist)))
    (or (not keymap)
        (assq toggle minor-mode-map-alist)
        (setq minor-mode-map-alist (cons (cons toggle keymap)
                                         minor-mode-map-alist))))
  ;; Record how to display this minor mode in the mode line
  (let ((mm (assq toggle semantic-minor-mode-alist)))
    (if mm
        (setcdr mm (list name))
      (setq semantic-minor-mode-alist (cons (list toggle name)
                                       semantic-minor-mode-alist)))))

(defun semantic-toggle-minor-mode-globally (mode &optional arg)
  "Toggle minor mode MODE in every Semantic enabled buffer.
Return non-nil if MODE is turned on in every Semantic enabled buffer.
If ARG is positive, enable, if it is negative, disable.  If ARG is
nil, then toggle.  Otherwise do nothing.  MODE must be a valid minor
mode defined in `minor-mode-alist' and must be too an interactive
function used to toggle the mode."
  (or (and (fboundp mode) (assq mode minor-mode-alist))
      (error "Semantic minor mode %s not found" mode))
  (if (not arg)
      (if (memq mode semantic-init-hooks)
	  (setq arg -1)
	(setq arg 1)))
  ;; Add or remove the MODE toggle function from
  ;; `semantic-init-hooks'.  Then turn MODE on or off in every
  ;; Semantic enabled buffer.
  (cond
   ;; Turn off if ARG < 0
   ((< arg 0)
    (remove-hook 'semantic-init-hooks mode)
    (semantic-map-buffers #'(lambda () (funcall mode -1)))
    nil)
   ;; Turn on if ARG > 0
   ((> arg 0)
    (add-hook 'semantic-init-hooks mode)
    (semantic-map-buffers #'(lambda () (funcall mode 1)))
    t)
   ;; Otherwise just check MODE state
   (t
    (memq mode semantic-init-hooks))
   ))

;;;;
;;;; Minor mode to highlight areas that a user edits.
;;;;

;;;###autoload
(defun global-semantic-highlight-edits-mode (&optional arg)
  "Toggle global use of option `semantic-highlight-edits-mode'.
If ARG is positive, enable, if it is negative, disable.
If ARG is nil, then toggle."
  (interactive "P")
  (setq global-semantic-highlight-edits-mode
        (semantic-toggle-minor-mode-globally
         'semantic-highlight-edits-mode arg)))

;;;###autoload
(defcustom global-semantic-highlight-edits-mode nil
  "*If non-nil enable global use of variable `semantic-highlight-edits-mode'.
When this mode is enabled, changes made to a buffer are highlighted
until the buffer is reparsed."
  :group 'semantic
  :group 'semantic-modes
  :type 'boolean
  :require 'semantic-util-modes
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (global-semantic-highlight-edits-mode (if val 1 -1))))

(defcustom semantic-highlight-edits-mode-hook nil
  "*Hook run at the end of function `semantic-highlight-edits-mode'."
  :group 'semantic
  :type 'hook)

(defface semantic-highlight-edits-face
  '((((class color) (background dark))
     ;; Put this back to something closer to black later.
     (:background "gray20"))
    (((class color) (background light))
     (:background "gray90")))
  "*Face used to show dirty tokens in `semantic-highlight-edits-mode'."
  :group 'semantic)

(defun semantic-highlight-edits-new-change-hook-fcn (overlay)
  "Function set into `semantic-edits-new-change-hook'.
Argument OVERLAY is the overlay created to mark the change.
This function will set the face property on this overlay."
  (semantic-overlay-put overlay 'face 'semantic-highlight-edits-face))

(defvar semantic-highlight-edits-mode-map
  (let ((km (make-sparse-keymap)))
    km)
  "Keymap for highlight-edits minor mode.")

(defvar semantic-highlight-edits-mode nil
  "Non-nil if highlight-edits minor mode is enabled.
Use the command `semantic-highlight-edits-mode' to change this variable.")
(make-variable-buffer-local 'semantic-highlight-edits-mode)

(defun semantic-highlight-edits-mode-setup ()
  "Setup option `semantic-highlight-edits-mode'.
The minor mode can be turned on only if semantic feature is available
and the current buffer was set up for parsing.  When minor mode is
enabled parse the current buffer if needed.  Return non-nil if the
minor mode is enabled."
  (if semantic-highlight-edits-mode
      (if (not (and (featurep 'semantic) (semantic-active-p)))
          (progn
            ;; Disable minor mode if semantic stuff not available
            (setq semantic-highlight-edits-mode nil)
            (error "Buffer %s was not set up for parsing"
                   (buffer-name)))
        (semantic-make-local-hook 'semantic-edits-new-change-hooks)
        (add-hook 'semantic-edits-new-change-hooks
                  'semantic-highlight-edits-new-change-hook-fcn nil t)
        )
    ;; Remove hooks
    (remove-hook 'semantic-edits-new-change-hooks
		 'semantic-highlight-edits-new-change-hook-fcn t)
    )
  semantic-highlight-edits-mode)

;;;###autoload
(defun semantic-highlight-edits-mode (&optional arg)
  "Minor mode for highlighting changes made in a buffer.
Changes are tracked by semantic so that the incremental parser can work
properly.
This mode will highlight those changes as they are made, and clear them
when the incremental parser accounts for those edits.
With prefix argument ARG, turn on if positive, otherwise off.  The
minor mode can be turned on only if semantic feature is available and
the current buffer was set up for parsing.  Return non-nil if the
minor mode is enabled."
  (interactive
   (list (or current-prefix-arg
             (if semantic-highlight-edits-mode 0 1))))
  (setq semantic-highlight-edits-mode
        (if arg
            (>
             (prefix-numeric-value arg)
             0)
          (not semantic-highlight-edits-mode)))
  (semantic-highlight-edits-mode-setup)
  (run-hooks 'semantic-highlight-edits-mode-hook)
  (if (interactive-p)
      (message "highlight-edits minor mode %sabled"
               (if semantic-highlight-edits-mode "en" "dis")))
  (semantic-mode-line-update)
  semantic-highlight-edits-mode)

(semantic-add-minor-mode 'semantic-highlight-edits-mode
                         "e"
                         semantic-highlight-edits-mode-map)


;;;;
;;;; Minor mode to show unmatched-syntax elements
;;;;

;;;###autoload
(defun global-semantic-show-unmatched-syntax-mode (&optional arg)
  "Toggle global use of option `semantic-show-unmatched-syntax-mode'.
If ARG is positive, enable, if it is negative, disable.
If ARG is nil, then toggle."
  (interactive "P")
  (setq global-semantic-show-unmatched-syntax-mode
        (semantic-toggle-minor-mode-globally
         'semantic-show-unmatched-syntax-mode arg)))

;;;###autoload
(defcustom global-semantic-show-unmatched-syntax-mode nil
  "*If non-nil, enable global use of `semantic-show-unmatched-syntax-mode'.
When this mode is enabled, syntax in the current buffer which the
semantic parser cannot match is highlighted with a red underline."
  :group 'semantic
  :group 'semantic-modes
  :type 'boolean
  :require 'semantic-util-modes
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (global-semantic-show-unmatched-syntax-mode (if val 1 -1))))

(defcustom semantic-show-unmatched-syntax-mode-hook nil
  "*Hook run at the end of function `semantic-show-unmatched-syntax-mode'."
  :group 'semantic
  :type 'hook)

(defface semantic-unmatched-syntax-face
  '((((class color) (background dark))
     (:underline "red"))
    (((class color) (background light))
     (:underline "red")))
  "*Face used to show unmatched syntax in.
The face is used in  `semantic-show-unmatched-syntax-mode'."
  :group 'semantic)

(defsubst semantic-unmatched-syntax-overlay-p (overlay)
  "Return non-nil if OVERLAY is an unmatched syntax one."
  (eq (semantic-overlay-get overlay 'semantic) 'unmatched))

(defun semantic-showing-unmatched-syntax-p ()
  "Return non-nil if an unmatched syntax overlay was found in buffer."
  (let ((ol (semantic-overlays-in (point-min) (point-max)))
        found)
    (while (and ol (not found))
      (setq found (semantic-unmatched-syntax-overlay-p (car ol))
            ol    (cdr ol)))
    found))

(defun semantic-show-unmatched-lex-tokens-fetch ()
  "Fetch a list of unmatched lexical tokens from the current buffer.
Uses the overlays which have accurate bounds, and rebuilds what was
originally passed in."
  (let ((ol (semantic-overlays-in (point-min) (point-max)))
	(ustc nil))
    (while ol
      (if (semantic-unmatched-syntax-overlay-p (car ol))
	  (setq ustc (cons (cons 'thing
				 (cons (semantic-overlay-start (car ol))
				       (semantic-overlay-end (car ol))))
			   ustc)))
      (setq ol (cdr ol)))
    (nreverse ustc))
  )

(defun semantic-clean-unmatched-syntax-in-region (beg end)
  "Remove all unmatched syntax overlays between BEG and END."
  (let ((ol (semantic-overlays-in beg end)))
    (while ol
      (if (semantic-unmatched-syntax-overlay-p (car ol))
	  (semantic-overlay-delete (car ol)))
      (setq ol (cdr ol)))))

(defsubst semantic-clean-unmatched-syntax-in-buffer ()
  "Remove all unmatched syntax overlays found in current buffer."
  (semantic-clean-unmatched-syntax-in-region
   (point-min) (point-max)))

(defsubst semantic-clean-token-of-unmatched-syntax (token)
  "Clean the area covered by TOKEN of unmatched syntax markers."
  (semantic-clean-unmatched-syntax-in-region
   (semantic-tag-start token) (semantic-tag-end token)))

(defun semantic-show-unmatched-syntax (syntax)
  "Function set into `semantic-unmatched-syntax-hook'.
This will highlight elements in SYNTAX as unmatched syntax."
  ;; This is called when `semantic-show-unmatched-syntax-mode' is
  ;; enabled.  Highlight the unmatched syntax, and then add a semantic
  ;; property to that overlay so we can add it to the official list of
  ;; semantic supported overlays.  This gets it cleaned up for errors,
  ;; buffer cleaning, and the like.
  (semantic-clean-unmatched-syntax-in-buffer) ;Clear previous highlighting
  (if syntax
      (let (o)
        (while syntax
          (setq o (semantic-make-overlay (semantic-lex-token-start (car syntax))
                                         (semantic-lex-token-end (car syntax))))
          (semantic-overlay-put o 'semantic 'unmatched)
          (semantic-overlay-put o 'face 'semantic-unmatched-syntax-face)
          (setq syntax (cdr syntax))))
    ))

(defun semantic-next-unmatched-syntax (point &optional bound)
  "Find the next overlay for unmatched syntax after POINT.
Do not search past BOUND if non-nil."
  (save-excursion
    (goto-char point)
    (let ((os point) (ol nil))
      (while (and os (< os (or bound (point-max))) (not ol))
	(setq os (semantic-overlay-next-change os))
	(when os
	  ;; Get overlays at position
	  (setq ol (semantic-overlays-at os))
	  ;; find the overlay that belongs to semantic
	  ;; and starts at the found position.
	  (while (and ol (listp ol))
	    (and (semantic-unmatched-syntax-overlay-p (car ol))
                 (setq ol (car ol)))
	    (if (listp ol)
                (setq ol (cdr ol))))))
      ol)))

(defvar semantic-show-unmatched-syntax-mode-map
  (let ((km (make-sparse-keymap)))
    (define-key km "\C-c,`" 'semantic-show-unmatched-syntax-next)
    km)
  "Keymap for command `semantic-show-unmatched-syntax-mode'.")

(defvar semantic-show-unmatched-syntax-mode nil
  "Non-nil if show-unmatched-syntax minor mode is enabled.
Use the command `semantic-show-unmatched-syntax-mode' to change this
variable.")
(make-variable-buffer-local 'semantic-show-unmatched-syntax-mode)

(defun semantic-show-unmatched-syntax-mode-setup ()
  "Setup the `semantic-show-unmatched-syntax' minor mode.
The minor mode can be turned on only if semantic feature is available
and the current buffer was set up for parsing.  When minor mode is
enabled parse the current buffer if needed.  Return non-nil if the
minor mode is enabled."
  (if semantic-show-unmatched-syntax-mode
      (if (not (and (featurep 'semantic) (semantic-active-p)))
          (progn
            ;; Disable minor mode if semantic stuff not available
            (setq semantic-show-unmatched-syntax-mode nil)
            (error "Buffer %s was not set up for parsing"
                   (buffer-name)))
        ;; Add hooks
        (semantic-make-local-hook 'semantic-unmatched-syntax-hook)
        (add-hook 'semantic-unmatched-syntax-hook
                  'semantic-show-unmatched-syntax nil t)
	(semantic-make-local-hook 'semantic-pre-clean-token-hooks)
	(add-hook 'semantic-pre-clean-token-hooks
		  'semantic-clean-token-of-unmatched-syntax nil t)
        ;; Show unmatched syntax elements
	(if (not (semantic--umatched-syntax-needs-refresh-p))
	    (semantic-show-unmatched-syntax
	     (semantic-unmatched-syntax-tokens))))
    ;; Remove hooks
    (remove-hook 'semantic-unmatched-syntax-hook
                 'semantic-show-unmatched-syntax t)
    (remove-hook 'semantic-pre-clean-token-hooks
		 'semantic-clean-token-of-unmatched-syntax t)
    ;; Cleanup unmatched-syntax highlighting
    (semantic-clean-unmatched-syntax-in-buffer))
  semantic-show-unmatched-syntax-mode)
  
;;;###autoload
(defun semantic-show-unmatched-syntax-mode (&optional arg)
  "Minor mode to highlight unmatched lexical syntax tokens.
When a parser executes, some elements in the buffer may not match any
parser rules.  These text characters are considered unmatched syntax.
Often time, the display of unmatched syntax can expose coding
problems before the compiler is run.

With prefix argument ARG, turn on if positive, otherwise off.  The
minor mode can be turned on only if semantic feature is available and
the current buffer was set up for parsing.  Return non-nil if the
minor mode is enabled.

\\{semantic-show-unmatched-syntax-mode-map}"
  (interactive
   (list (or current-prefix-arg
             (if semantic-show-unmatched-syntax-mode 0 1))))
  (setq semantic-show-unmatched-syntax-mode
        (if arg
            (>
             (prefix-numeric-value arg)
             0)
          (not semantic-show-unmatched-syntax-mode)))
  (semantic-show-unmatched-syntax-mode-setup)
  (run-hooks 'semantic-show-unmatched-syntax-mode-hook)
  (if (interactive-p)
      (message "show-unmatched-syntax minor mode %sabled"
               (if semantic-show-unmatched-syntax-mode "en" "dis")))
  (semantic-mode-line-update)
  semantic-show-unmatched-syntax-mode)

(semantic-add-minor-mode 'semantic-show-unmatched-syntax-mode
                         "u"
                         semantic-show-unmatched-syntax-mode-map)

(defun semantic-show-unmatched-syntax-next ()
  "Move forward to the next occurrence of unmatched syntax."
  (interactive)
  (let ((o (semantic-next-unmatched-syntax (point))))
    (if o
	(goto-char (semantic-overlay-start o)))))


;;;;
;;;; Minor mode to display the parser state in the modeline.
;;;;

;;;###autoload
(defcustom global-semantic-show-parser-state-mode nil
  "*If non-nil enable global use of `semantic-show-parser-state-mode'.
When enabled, the current parse state of the current buffer is displayed
in the mode line. See `semantic-show-parser-state-marker' for details
on what is displayed."
  :group 'semantic
  :type 'boolean
  :require 'semantic-util-modes
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (global-semantic-show-parser-state-mode (if val 1 -1))))

;;;###autoload
(defun global-semantic-show-parser-state-mode (&optional arg)
  "Toggle global use of option `semantic-show-parser-state-mode'.
If ARG is positive, enable, if it is negative, disable.
If ARG is nil, then toggle."
  (interactive "P")
  (setq global-semantic-show-parser-state-mode
        (semantic-toggle-minor-mode-globally
         'semantic-show-parser-state-mode arg)))

(defcustom semantic-show-parser-state-mode-hook nil
  "*Hook run at the end of function `semantic-show-parser-state-mode'."
  :group 'semantic
  :type 'hook)

(defvar semantic-show-parser-state-mode-map
  (let ((km (make-sparse-keymap)))
    km)
  "Keymap for show-parser-state minor mode.")

(defvar semantic-show-parser-state-mode nil
  "Non-nil if show-parser-state minor mode is enabled.
Use the command `semantic-show-parser-state-mode' to change this variable.")
(make-variable-buffer-local 'semantic-show-parser-state-mode)

(defun semantic-show-parser-state-mode-setup ()
  "Setup option `semantic-show-parser-state-mode'.
The minor mode can be turned on only if semantic feature is available
and the current buffer was set up for parsing.  When minor mode is
enabled parse the current buffer if needed.  Return non-nil if the
minor mode is enabled."
  (if semantic-show-parser-state-mode
      (if (not (and (featurep 'semantic) (semantic-active-p)))
          (progn
            ;; Disable minor mode if semantic stuff not available
            (setq semantic-show-parser-state-mode nil)
            (error "Buffer %s was not set up for parsing"
                   (buffer-name)))
	;; Set up mode line

	(when (not
	       (memq 'semantic-show-parser-state-string mode-line-modified))
	  (setq mode-line-modified
		(append mode-line-modified
			'(semantic-show-parser-state-string))))
	;; Add hooks
        (semantic-make-local-hook 'semantic-edits-new-change-hooks)
        (add-hook 'semantic-edits-new-change-hooks
                  'semantic-show-parser-state-marker nil t)
	(semantic-make-local-hook 'semantic-edits-incremental-reparse-failed-hooks)
	(add-hook 'semantic-edits-incremental-reparse-failed-hooks
		  'semantic-show-parser-state-marker nil t)
	(semantic-make-local-hook 'semantic-after-partial-cache-change-hook)
	(add-hook 'semantic-after-partial-cache-change-hook
		  'semantic-show-parser-state-marker nil t)
	(semantic-make-local-hook 'semantic-after-toplevel-cache-change-hook)
	(add-hook 'semantic-after-toplevel-cache-change-hook
		  'semantic-show-parser-state-marker nil t)
	(semantic-show-parser-state-marker)

	(semantic-make-local-hook 'semantic-before-auto-parse-hooks)
	(add-hook 'semantic-before-auto-parse-hooks
		  'semantic-show-parser-state-auto-marker nil t)
	(semantic-make-local-hook 'semantic-after-auto-parse-hooks)
	(add-hook 'semantic-after-auto-parse-hooks
		  'semantic-show-parser-state-marker nil t)

	(semantic-make-local-hook 'semantic-before-idle-scheduler-reparse-hooks)
	(add-hook 'semantic-before-idle-scheduler-reparse-hooks
		  'semantic-show-parser-state-auto-marker nil t)
	(semantic-make-local-hook 'semantic-after-idle-scheduler-reparse-hooks)
	(add-hook 'semantic-after-idle-scheduler-reparse-hooks
		  'semantic-show-parser-state-marker nil t)
        )
    ;; Remove parts of mode line
    (setq mode-line-modified
	  (delq 'semantic-show-parser-state-string mode-line-modified))
    ;; Remove hooks
    (remove-hook 'semantic-edits-new-change-hooks
		 'semantic-show-parser-state-marker t)
    (remove-hook 'semantic-edits-incremental-reparse-failed-hooks
		 'semantic-show-parser-state-marker t)
    (remove-hook 'semantic-after-partial-cache-change-hook
		 'semantic-show-parser-state-marker t)
    (remove-hook 'semantic-after-toplevel-cache-change-hook
		 'semantic-show-parser-state-marker t)

    (remove-hook 'semantic-before-auto-parse-hooks
		 'semantic-show-parser-state-auto-marker t)
    (remove-hook 'semantic-after-auto-parse-hooks
		 'semantic-show-parser-state-marker t)

    (remove-hook 'semantic-before-idle-scheduler-reparse-hooks
		 'semantic-show-parser-state-auto-marker t)
    (remove-hook 'semantic-after-idle-scheduler-reparse-hooks
		 'semantic-show-parser-state-marker t)
    )
  semantic-show-parser-state-mode)

;;;###autoload
(defun semantic-show-parser-state-mode (&optional arg)
  "Minor mode for displaying parser cache state in the modeline.
The cache can be in one of three states.  They are
Up to date, Partial reprase needed, and Full reparse needed.
The state is indicated in the modeline with the following characters:
 `-'  ->  The cache is up to date.
 `!'  ->  The cache requires a full update.
 `~'  ->  The cache needs to be incrementally parsed.
 `%'  ->  The cache is not currently parseable.
 `@'  ->  Auto-parse in progress (not set here.)
With prefix argument ARG, turn on if positive, otherwise off.  The
minor mode can be turned on only if semantic feature is available and
the current buffer was set up for parsing.  Return non-nil if the
minor mode is enabled."
  (interactive
   (list (or current-prefix-arg
             (if semantic-show-parser-state-mode 0 1))))
  (setq semantic-show-parser-state-mode
        (if arg
            (>
             (prefix-numeric-value arg)
             0)
          (not semantic-show-parser-state-mode)))
  (semantic-show-parser-state-mode-setup)
  (run-hooks 'semantic-show-parser-state-mode-hook)
  (if (interactive-p)
      (message "show-parser-state minor mode %sabled"
               (if semantic-show-parser-state-mode "en" "dis")))
  (semantic-mode-line-update)
  semantic-show-parser-state-mode)

(semantic-add-minor-mode 'semantic-show-parser-state-mode
                         ""
                         semantic-show-parser-state-mode-map)

(defvar semantic-show-parser-state-string nil
  "String showing the parser state for this buffer.
See `semantic-show-parser-state-marker' for details.")
(make-variable-buffer-local 'semantic-show-parser-state-string)

(defun semantic-show-parser-state-marker (&rest ignore)
  "Set `semantic-show-parser-state-string' to indicate parser state.
This marker is one of the following:
 `-'  ->  The cache is up to date.
 `!'  ->  The cache requires a full update.
 `~'  ->  The cache needs to be incrementally parsed.
 `%'  ->  The cache is not currently parseable.
 `@'  ->  Auto-parse in progress (not set here.)
Arguments IGNORE are ignored, and accepted so this can be used as a hook
in many situations."
  (setq semantic-show-parser-state-string
	(cond ((semantic-parse-tree-needs-rebuild-p)
	       "!")
	      ((semantic-parse-tree-needs-update-p)
	       "~")
	      ((semantic-parse-tree-unparseable-p)
	       "%")
	      (t
               "-")))
  ;;(message "Setup mode line indicator to [%s]" semantic-show-parser-state-string)
  (semantic-mode-line-update))

(defun semantic-show-parser-state-auto-marker ()
  "Hook function run before an autoparse.
Set up `semantic-show-parser-state-marker' to show `@'
to indicate a parse in progress."
  (unless (semantic-parse-tree-up-to-date-p)
    (setq semantic-show-parser-state-string "@")
    (semantic-mode-line-update)
    ;; For testing.
    ;;(sit-for 1)
    ))


;;;;
;;;; Minor mode to make function decls sticky.
;;;;

;;;###autoload
(defun global-semantic-stickyfunc-mode (&optional arg)
  "Toggle global use of option `semantic-stickyfunc-mode'.
If ARG is positive, enable, if it is negative, disable.
If ARG is nil, then toggle."
  (interactive "P")
  (setq global-semantic-stickyfunc-mode
        (semantic-toggle-minor-mode-globally
         'semantic-stickyfunc-mode arg)))

;;;###autoload
(defcustom global-semantic-stickyfunc-mode nil
  "*If non-nil, enable global use of `semantic-stickyfunc-mode'.
This minor mode only works for Emacs 21 or later.
When enabled, the header line is enabled, and the first line
of the current function or method is displayed in it.
This makes it appear that the first line of that tag is
`sticky' to the top of the window."
  :group 'semantic
  :group 'semantic-modes
  :type 'boolean
  :require 'semantic-util-modes
  :initialize 'custom-initialize-default
  :set (lambda (sym val)
         (global-semantic-stickyfunc-mode (if val 1 -1))))

(defcustom semantic-stickyfunc-mode-hook nil
  "*Hook run at the end of function `semantic-stickyfunc-mode'."
  :group 'semantic
  :type 'hook)

(defvar semantic-stickyfunc-mode-map
  (let ((km (make-sparse-keymap)))
    km)
  "Keymap for stickyfunc minor mode.")

(defvar semantic-stickyfunc-mode nil
  "Non-nil if stickyfunc minor mode is enabled.
Use the command `semantic-stickyfunc-mode' to change this variable.")
(make-variable-buffer-local 'semantic-stickyfunc-mode)

(defcustom semantic-stickyfunc-indent-string
  (if window-system
      "    "
    "")
  "*String used to indent the stickyfunc header.
Customize this string to match the space used by scrollbars and
fringe so it does not appear that the code is moving left/right
when it lands in the sticky line.")

(defvar semantic-stickyfunc-old-hlf nil
  "Value of the header line when entering sticky func mode.")
(make-variable-buffer-local 'semantic-stickyfunc-old-hlf)

(defconst semantic-stickyfunc-header-line-format
  '(:eval (list semantic-stickyfunc-indent-string
                (semantic-stickyfunc-fetch-stickyline)))
  "The header line format used by sticky func mode.")

(defun semantic-stickyfunc-mode-setup ()
  "Setup option `semantic-stickyfunc-mode'.
For semantic enabled buffers, make the function declaration for the top most
function \"sticky\".  This is accomplished by putting the first line of
text for that function in Emacs 21's header line."
  (if semantic-stickyfunc-mode
      (progn
	(unless (and (featurep 'semantic) (semantic-active-p))
	  ;; Disable minor mode if semantic stuff not available
	  (setq semantic-stickyfunc-mode nil)
	  (error "Buffer %s was not set up for parsing" (buffer-name)))
	(unless (boundp 'default-header-line-format)
	  ;; Disable if there are no header lines to use.
	  (setq semantic-stickyfunc-mode nil)
	  (error "Sticky Function mode requires Emacs 21"))
	;; Enable the mode
	;; Save previous buffer local value of header line format.
	(kill-local-variable 'semantic-stickyfunc-old-hlf)
	(when (local-variable-p 'header-line-format)
	  (setq semantic-stickyfunc-old-hlf header-line-format))
	(setq header-line-format semantic-stickyfunc-header-line-format)
	)
    ;; Disable sticky func mode
    ;; Restore previous buffer local value of header line format if
    ;; the current one is the sticky func one.
    (when (eq header-line-format semantic-stickyfunc-header-line-format)
      (kill-local-variable 'header-line-format)
      (when (local-variable-p 'semantic-stickyfunc-old-hlf)
	(setq header-line-format semantic-stickyfunc-old-hlf))))
  semantic-stickyfunc-mode)

;;;###autoload
(defun semantic-stickyfunc-mode (&optional arg)
  "Minor mode to show the title of a tag in the header line.
Enables/disables making the header line of functions sticky.
A function (or other tag class specified by
`semantic-stickyfunc-sticky-classes') has a header line, meaning the
first line which describes the rest of the construct.  This first
line is what is displayed in the Emacs 21 header line.

With prefix argument ARG, turn on if positive, otherwise off.  The
minor mode can be turned on only if semantic feature is available and
the current buffer was set up for parsing.  Return non-nil if the
minor mode is enabled."
  (interactive
   (list (or current-prefix-arg
             (if semantic-stickyfunc-mode 0 1))))
  (setq semantic-stickyfunc-mode
        (if arg
            (>
             (prefix-numeric-value arg)
             0)
          (not semantic-stickyfunc-mode)))
  (semantic-stickyfunc-mode-setup)
  (run-hooks 'semantic-stickyfunc-mode-hook)
  (if (interactive-p)
      (message "Stickyfunc minor mode %sabled"
               (if semantic-stickyfunc-mode "en" "dis")))
  (semantic-mode-line-update)
  semantic-stickyfunc-mode)

(defvar semantic-stickyfunc-sticky-classes
  '(function type)
  "List of tag classes which sticky func will display in the header line.")
(make-variable-buffer-local 'semantic-stickyfunc-sticky-classes)

(defun semantic-stickyfunc-fetch-stickyline ()
  "Make the function at the top of the current window sticky.
Capture it's function declaration, and place it in the header line.
If there is no function, disable the header line."
  (let ((str
	 (save-excursion
	   (goto-char (window-start (selected-window)))
	   (forward-line -1)
	   (end-of-line)
	   ;; Capture this function
	   (let* ((tags (nreverse (semantic-find-tag-by-overlay (point))))
		  (tag (progn
			 ;; Get rid of non-matching tags.
			 (while (and tags
				     (not (member
					   (semantic-tag-class (car tags))
					   semantic-stickyfunc-sticky-classes))
				     )
			   (setq tags (cdr tags)))
			 (car tags))))
	     ;; TAG is nil if there was nothing of the apropriate type there.
	     (if (not tag)
		 ;; Set it to be the text under the header line
		 (buffer-substring (point-at-bol) (point-at-eol))
	       ;; Get it
	       (goto-char (semantic-tag-start tag))
               ;; Klaus Berndl <klaus.berndl@sdm.de>:
               ;; goto the tag name; this is especially needed for languages
               ;; like c++ where a often used style is like:
               ;;     void
               ;;     ClassX::methodM(arg1...)
               ;;     {
               ;;       ...
               ;;     }
               ;; Without going to the tag-name we would get"void" in the
               ;; header line which is IMHO not really useful
               (search-forward (semantic-tag-name tag) nil t)
	       (buffer-substring (point-at-bol) (point-at-eol))
	       ))))
	(start 0))
    (while (string-match "%" str start)
      (setq str (replace-match "%%" t t str 0)
	    start (1+ (match-end 0)))
      )
    str))

(semantic-add-minor-mode 'semantic-stickyfunc-mode
                         "" ;; Don't need indicator.  It's quite visible
                         semantic-stickyfunc-mode-map)

(provide 'semantic-util-modes)

;;; semantic-util-modes.el ends here
