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;;; highlight-symbol.el --- automatic and manual symbol highlighting
;;
;; Copyright (C) 2007-2009 Nikolaj Schumacher
;;
;; Author: Nikolaj Schumacher <bugs * nschum de>
;; Version: 1.1
;; Keywords: faces, matching
;; URL: http://nschum.de/src/emacs/highlight-symbol/
;; Compatibility: GNU Emacs 22.x, GNU Emacs 23.x
;;
;; This file is NOT part of GNU Emacs.
;;
;; 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
;; of the License, 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, see <http://www.gnu.org/licenses/>.
;;
;;; Commentary:
;;
;; Add the following to your .emacs file:
;; (require 'highlight-symbol)
;; (global-set-key [(control f3)] 'highlight-symbol-at-point)
;; (global-set-key [f3] 'highlight-symbol-next)
;; (global-set-key [(shift f3)] 'highlight-symbol-prev)
;; (global-set-key [(meta f3)] 'highlight-symbol-prev)))
;; (global-set-key [(control meta f3)] 'highlight-symbol-query-replace)
;;
;; Use `highlight-symbol-at-point' to toggle highlighting of the symbol at
;; point throughout the current buffer. Use `highlight-symbol-mode' to keep the
;; symbol at point highlighted.
;;
;; The functions `highlight-symbol-next', `highlight-symbol-prev',
;; `highlight-symbol-next-in-defun' and `highlight-symbol-prev-in-defun' allow
;; for cycling through the locations of any symbol at point.
;; When `highlight-symbol-on-navigation-p' is set, highlighting is triggered
;; regardless of `highlight-symbol-idle-delay'.
;;
;; `highlight-symbol-query-replace' can be used to replace the symbol.
;;
;;; Change Log:
;;
;; 2009-04-13 (1.1)
;; Added `highlight-symbol-query-replace'.
;;
;; 2009-03-19 (1.0.5)
;; Fixed `highlight-symbol-idle-delay' void variable message.
;; Fixed color repetition bug. (thanks to Hugo Schmitt)
;;
;; 2008-05-02 (1.0.4)
;; Added `highlight-symbol-on-navigation-p' option.
;;
;; 2008-02-26 (1.0.3)
;; Added `highlight-symbol-remove-all'.
;;
;; 2007-09-06 (1.0.2)
;; Fixed highlighting with delay set to 0. (thanks to Stefan Persson)
;;
;; 2007-09-05 (1.0.1)
;; Fixed completely broken temporary highlighting.
;;
;; 2007-07-30 (1.0)
;; Keep temp highlight while jumping.
;; Replaced `highlight-symbol-faces' with `highlight-symbol-colors'.
;; Fixed dependency and Emacs 21 bug. (thanks to Gregor Gorjanc)
;; Prevent calling `highlight-symbol-at-point' on nil.
;;
;; 2007-04-20 (0.9.1)
;; Fixed bug in `highlight-symbol-jump'. (thanks to Per Nordlöw)
;;
;; 2007-04-06 (0.9)
;; Initial release.
;;
;;; Code:
(require 'thingatpt)
(require 'hi-lock)
(eval-when-compile (require 'cl))
(push "^No symbol at point$" debug-ignored-errors)
(defgroup highlight-symbol nil
"Automatic and manual symbols highlighting"
:group 'faces
:group 'matching)
(defface highlight-symbol-face
'((((class color) (background dark))
(:background "gray30"))
(((class color) (background light))
(:background "gray90")))
"*Face used by `highlight-symbol-mode'."
:group 'highlight-symbol)
(defvar highlight-symbol-timer nil)
(defun highlight-symbol-update-timer (value)
(when highlight-symbol-timer
(cancel-timer highlight-symbol-timer))
(setq highlight-symbol-timer
(and value (/= value 0)
(run-with-idle-timer value t 'highlight-symbol-temp-highlight))))
(defvar highlight-symbol-mode nil)
(defun highlight-symbol-set (symbol value)
(when symbol (set symbol value))
(when highlight-symbol-mode
(highlight-symbol-update-timer value)))
(defcustom highlight-symbol-idle-delay 1.5
"*Number of seconds of idle time before highlighting the current symbol.
If this variable is set to 0, no idle time is required.
Changing this does not take effect until `highlight-symbol-mode' has been
disabled for all buffers."
:type 'number
:set 'highlight-symbol-set
:group 'highlight-symbol)
(defcustom highlight-symbol-colors
'("yellow" "DeepPink" "cyan" "MediumPurple1" "SpringGreen1"
"DarkOrange" "HotPink1" "RoyalBlue1" "OliveDrab")
"*Colors used by `highlight-symbol-at-point'.
highlighting the symbols will use these colors in order."
:type '(repeat color)
:group 'highlight-symbol)
(defcustom highlight-symbol-on-navigation-p nil
"*Wether or not to temporary highlight the symbol when using
`highlight-symbol-jump' family of functions."
:type 'boolean
:group 'highlight-symbol)
(defvar highlight-symbol-color-index 0)
(make-variable-buffer-local 'highlight-symbol-color-index)
(defvar highlight-symbol nil)
(make-variable-buffer-local 'highlight-symbol)
(defvar highlight-symbol-list nil)
(make-variable-buffer-local 'highlight-symbol-list)
(defconst highlight-symbol-border-pattern
(if (>= emacs-major-version 22) '("\\_<" . "\\_>") '("\\<" . "\\>")))
;;;###autoload
(define-minor-mode highlight-symbol-mode
"Minor mode that highlights the symbol under point throughout the buffer.
Highlighting takes place after `highlight-symbol-idle-delay'."
nil " hl-s" nil
(if highlight-symbol-mode
;; on
(let ((hi-lock-archaic-interface-message-used t))
(unless hi-lock-mode (hi-lock-mode 1))
(highlight-symbol-update-timer highlight-symbol-idle-delay)
(add-hook 'post-command-hook 'highlight-symbol-mode-post-command nil t))
;; off
(remove-hook 'post-command-hook 'highlight-symbol-mode-post-command t)
(highlight-symbol-mode-remove-temp)
(kill-local-variable 'highlight-symbol)))
;;;###autoload
(defun highlight-symbol-at-point ()
"Toggle highlighting of the symbol at point.
This highlights or unhighlights the symbol at point using the first
element in of `highlight-symbol-faces'."
(interactive)
(let ((symbol (highlight-symbol-get-symbol)))
(unless symbol (error "No symbol at point"))
(unless hi-lock-mode (hi-lock-mode 1))
(if (member symbol highlight-symbol-list)
;; remove
(progn
(setq highlight-symbol-list (delete symbol highlight-symbol-list))
(hi-lock-unface-buffer symbol))
;; add
(when (equal symbol highlight-symbol)
(highlight-symbol-mode-remove-temp))
(let ((color (nth highlight-symbol-color-index
highlight-symbol-colors)))
(if color ;; wrap
(incf highlight-symbol-color-index)
(setq highlight-symbol-color-index 1
color (car highlight-symbol-colors)))
(setq color `((background-color . ,color)
(foreground-color . "black")))
;; highlight
(with-no-warnings
(if (< emacs-major-version 22)
(hi-lock-set-pattern `(,symbol (0 (quote ,color) t)))
(hi-lock-set-pattern symbol color)))
(push symbol highlight-symbol-list)))))
;;;###autoload
(defun highlight-symbol-remove-all ()
"Remove symbol highlighting in buffer."
(interactive)
(mapc 'hi-lock-unface-buffer highlight-symbol-list)
(setq highlight-symbol-list nil))
;;;###autoload
(defun highlight-symbol-next ()
"Jump to the next location of the symbol at point within the function."
(interactive)
(highlight-symbol-jump 1))
;;;###autoload
(defun highlight-symbol-prev ()
"Jump to the previous location of the symbol at point within the function."
(interactive)
(highlight-symbol-jump -1))
;;;###autoload
(defun highlight-symbol-next-in-defun ()
"Jump to the next location of the symbol at point within the defun."
(interactive)
(save-restriction
(narrow-to-defun)
(highlight-symbol-jump 1)))
;;;###autoload
(defun highlight-symbol-prev-in-defun ()
"Jump to the previous location of the symbol at point within the defun."
(interactive)
(save-restriction
(narrow-to-defun)
(highlight-symbol-jump -1)))
;;;###autoload
(defun highlight-symbol-query-replace (replacement)
"*Replace the symbol at point."
(interactive (let ((symbol (or (thing-at-point 'symbol)
(error "No symbol at point"))))
(highlight-symbol-temp-highlight)
(set query-replace-to-history-variable
(cons (substring-no-properties symbol)
(eval query-replace-to-history-variable)))
(list
(read-from-minibuffer "Replacement: " nil nil nil
query-replace-to-history-variable))))
(goto-char (beginning-of-thing 'symbol))
(query-replace-regexp (highlight-symbol-get-symbol) replacement))
(defun highlight-symbol-get-symbol ()
"Return a regular expression dandifying the symbol at point."
(let ((symbol (thing-at-point 'symbol)))
(when symbol (concat (car highlight-symbol-border-pattern)
(regexp-quote symbol)
(cdr highlight-symbol-border-pattern)))))
(defun highlight-symbol-temp-highlight ()
"Highlight the current symbol until a command is executed."
(when highlight-symbol-mode
(let ((symbol (highlight-symbol-get-symbol)))
(unless (or (equal symbol highlight-symbol)
(member symbol highlight-symbol-list))
(highlight-symbol-mode-remove-temp)
(when symbol
(setq highlight-symbol symbol)
(hi-lock-set-pattern symbol 'highlight-symbol-face))))))
(defun highlight-symbol-mode-remove-temp ()
"Remove the temporary symbol highlighting."
(when highlight-symbol
(hi-lock-unface-buffer highlight-symbol)
(setq highlight-symbol nil)))
(defun highlight-symbol-mode-post-command ()
"After a command, change the temporary highlighting.
Remove the temporary symbol highlighting and, unless a timeout is specified,
create the new one."
(if (eq this-command 'highlight-symbol-jump)
(when highlight-symbol-on-navigation-p
(highlight-symbol-temp-highlight))
(if (eql highlight-symbol-idle-delay 0)
(highlight-symbol-temp-highlight)
(highlight-symbol-mode-remove-temp))))
(defun highlight-symbol-jump (dir)
"Jump to the next or previous occurence of the symbol at point.
DIR has to be 1 or -1."
(let ((symbol (highlight-symbol-get-symbol)))
(if symbol
(let* ((case-fold-search nil)
(bounds (bounds-of-thing-at-point 'symbol))
(offset (- (point) (if (< 0 dir) (cdr bounds) (car bounds)))))
(unless (eq last-command 'highlight-symbol-jump)
(push-mark))
;; move a little, so we don't find the same instance again
(goto-char (- (point) offset))
(let ((target (re-search-forward symbol nil t dir)))
(unless target
(goto-char (if (< 0 dir) (point-min) (point-max)))
(setq target (re-search-forward symbol nil nil dir)))
(goto-char (+ target offset)))
(setq this-command 'highlight-symbol-jump))
(error "No symbol at point"))))
(provide 'highlight-symbol)
;;; highlight-symbol.el ends here
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