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1040 lines
38 KiB
EmacsLisp
1040 lines
38 KiB
EmacsLisp
;;; hilit-chg.el --- minor mode displaying buffer changes with special face
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;; Copyright (C) 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
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;; 2008, 2009 Free Software Foundation, Inc.
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;; Author: Richard Sharman <rsharman@pobox.com>
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;; Keywords: faces
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; A minor mode: "Highlight Changes mode".
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;; When Highlight Changes mode is enabled changes to the buffer are
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;; recorded with a text property. Normally these ranges of text are
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;; displayed in a distinctive face. However, sometimes it is
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;; desirable to temporarily not see these changes. Instead of
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;; disabling Highlight Changes mode (which would remove the text property)
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;; use the command highlight-changes-visible-mode.
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;; Two faces are supported: one for changed or inserted text and
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;; another for the first character after text has been deleted.
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;; When Highlight Changes mode is on (even if changes are not visible)
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;; you can go to the next or previous change with
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;; `highlight-changes-next-change' or `highlight-changes-previous-change'.
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;; Command highlight-compare-with-file shows changes in this file
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;; compared with another file (by default the previous version of the
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;; file).
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;;
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;; The command highlight-compare-buffers compares two buffers by
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;; highlighting their differences.
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;; You can "age" different sets of changes by using
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;; `highlight-changes-rotate-faces'. This rotates through a series
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;; of different faces, so you can distinguish "new" changes from "older"
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;; changes. You can customize these "rotated" faces in two ways. You can
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;; either explicitly define each face by customizing
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;; `highlight-changes-face-list'. If, however, the faces differ from
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;; `highlight-changes-face' only in the foreground color, you can simply set
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;; `highlight-changes-colors'. If `highlight-changes-face-list' is nil when
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;; the faces are required they will be constructed from
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;; `highlight-changes-colors'.
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;; You can automatically rotate faces when the buffer is saved;
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;; see function `highlight-changes-rotate-faces' for how to do this.
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;; The hook `highlight-changes-mode-hook' is called when
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;; Highlight Changes mode is turned on or off.
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;; When it called, variable `highlight-changes-mode' has been updated
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;; to the new value.
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;;
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;; Example usage:
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;; (defun my-highlight-changes-mode-hook ()
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;; (if highlight-changes-mode
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;; (add-hook 'write-file-functions 'highlight-changes-rotate-faces nil t)
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;; (remove-hook 'write-file-functions 'highlight-changes-rotate-faces t)
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;; ))
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;; Automatically enabling Highlight Changes mode
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;;
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;; Normally, Highlight Changes mode is turned on explicitly in a buffer.
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;;
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;; If you prefer to have it automatically invoked you can do it as
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;; follows.
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;; 1. Most modes have a major-hook, typically called MODE-hook. You
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;; can use `add-hook' to call `highlight-changes-mode'.
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;; Example:
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;; (add-hook 'c-mode-hook 'highlight-changes-mode)
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;; However, this cannot be done for Fundamental mode for there is no
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;; such hook.
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;; 2. You can use the function `global-highlight-changes-mode'
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;;
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;; This function, which is fashioned after the way `global-font-lock' works,
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;; toggles on or off global Highlight Changes mode. When activated, it turns
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;; on Highlight Changes mode in all "suitable" existing buffers and will turn
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;; it on in new "suitable" buffers to be created.
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;; A buffer's "suitability" is determined by variable
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;; `highlight-changes-global-modes', as follows. If it is
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;; * nil -- then no buffers are suitable;
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;; * a function -- this function is called and the result is used. As
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;; an example, if the value is `buffer-file-name' then all buffers
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;; who are visiting files are suitable, but others (like dired
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;; buffers) are not;
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;; * a list -- then the buffer is suitable if and only if its mode is in the
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;; list, except if the first element is `not', in which case the test
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;; is reversed (i.e. it is a list of unsuitable modes).
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;; * Otherwise, the buffer is suitable if its name does not begin with
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;; ` ' or `*' and if `buffer-file-name' returns true.
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;; To enable it for future sessions put this in your ~/.emacs file:
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;; (global-highlight-changes-mode t)
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;; Possible bindings:
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;; (global-set-key '[C-right] 'highlight-changes-next-change)
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;; (global-set-key '[C-left] 'highlight-changes-previous-change)
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;;
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;; Other interactive functions (that could be bound if desired):
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;; highlight-changes-mode
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;; highlight-changes-toggle-visibility
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;; highlight-changes-remove-highlight
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;; highlight-compare-with-file
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;; highlight-compare-buffers
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;; highlight-changes-rotate-faces
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;;; Bugs:
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;; - the next-change and previous-change functions are too literal;
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;; they should find the next "real" change, in other words treat
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;; consecutive changes as one.
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;;; To do (maybe), notes, ...
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;; - having different faces for deletion and non-deletion: is it
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;; really worth the hassle?
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;; - highlight-compare-with-file should allow RCS files - e.g. nice to be
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;; able to say show changes compared with version 2.1.
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;;; History:
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;; R Sharman (rsharman@pobox.com) Feb 1998:
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;; - initial release as change-mode.
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;; Jari Aalto <jari.aalto@ntc.nokia.com> Mar 1998
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;; - fixes for byte compile errors
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;; - use eval-and-compile for autoload
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;; Marijn Ros <J.M.Ros@fys.ruu.nl> Mar 98
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;; - suggested turning it on by default
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;; Eric Ludlam <zappo@gnu.org> Suggested using overlays.
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;; July 98
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;; - global mode and various stuff added
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;; - Changed to use overlays
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;; August 98
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;; - renamed to Highlight Changes mode.
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;; Dec 2003
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;; - Use require for ediff stuff
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;; - Added highlight-compare-buffers
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;; Mar 2008
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;; - Made highlight-changes-mode like other modes (toggle on/off)
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;; - Added new command highlight-changes-visible-mode to replace the
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;; previous active/passive aspect of highlight-changes-mode.
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;; - Removed highlight-changes-toggle-hook
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;; - Put back eval-and-compile inadvertently dropped
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;; May 2008
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;; - Removed highlight-changes-disable-hook and highlight-changes-enable-hook
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;; because highlight-changes-mode-hook can do both.
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;;; Code:
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(require 'wid-edit)
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;; ====================== Customization =======================
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(defgroup highlight-changes nil
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"Highlight Changes mode."
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:version "20.4"
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:group 'faces)
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;; Face information: How the changes appear.
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;; Defaults for face: red foreground, no change to background,
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;; and underlined if a change is because of a deletion.
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;; Note: underlining is helpful in that it shows up changes in white space.
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;; However, having it set for non-delete changes can be annoying because all
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;; indentation on inserts gets underlined (which can look pretty ugly!).
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(defface highlight-changes
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'((((min-colors 88) (class color)) (:foreground "red1"))
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(((class color)) (:foreground "red" ))
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(t (:inverse-video t)))
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"Face used for highlighting changes."
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:group 'highlight-changes)
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(define-obsolete-face-alias 'highlight-changes-face
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'highlight-changes "22.1")
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;; This looks pretty ugly, actually. Maybe the underline should be removed.
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(defface highlight-changes-delete
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'((((min-colors 88) (class color)) (:foreground "red1" :underline t))
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(((class color)) (:foreground "red" :underline t))
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(t (:inverse-video t)))
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"Face used for highlighting deletions."
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:group 'highlight-changes)
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(define-obsolete-face-alias 'highlight-changes-delete-face
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'highlight-changes-delete "22.1")
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;; A (not very good) default list of colors to rotate through.
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(define-obsolete-variable-alias 'highlight-changes-colours
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'highlight-changes-colors "22.1")
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(defcustom highlight-changes-colors
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(if (eq (frame-parameter nil 'background-mode) 'light)
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;; defaults for light background:
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'( "magenta" "blue" "darkgreen" "chocolate" "sienna4" "NavyBlue")
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;; defaults for dark background:
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'("yellow" "magenta" "blue" "maroon" "firebrick" "green4" "DarkOrchid"))
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"Colors used by `highlight-changes-rotate-faces'.
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The newest rotated change will be displayed in the first element of this list,
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the next older will be in the second element etc.
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This list is used if `highlight-changes-face-list' is nil, otherwise that
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variable overrides this list. If you only care about foreground
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colors then use this, if you want fancier faces then set
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`highlight-changes-face-list'."
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:type '(repeat color)
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:group 'highlight-changes)
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;; When you invoke highlight-changes-mode, should highlight-changes-visible-mode
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;; be on or off?
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(define-obsolete-variable-alias 'highlight-changes-initial-state
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'highlight-changes-visibility-initial-state "23.1")
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(defcustom highlight-changes-visibility-initial-state t
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"Controls whether changes are initially visible in Highlight Changes mode.
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This controls the initial value of `highlight-changes-visible-mode'.
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When a buffer is in Highlight Changes mode the function
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`highlight-changes-visible-mode' is used to toggle the mode on or off."
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:type 'boolean
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:group 'highlight-changes)
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;; highlight-changes-global-initial-state has been removed
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;; These are the strings displayed in the mode-line for the minor mode:
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(define-obsolete-variable-alias 'highlight-changes-active-string
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'highlight-changes-visible-string "23.1")
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(defcustom highlight-changes-visible-string " +Chg"
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"The string used when in Highlight Changes mode and changes are visible.
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This should be set to nil if no indication is desired, or to
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a string with a leading space."
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:type '(choice string
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(const :tag "None" nil))
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:group 'highlight-changes)
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(define-obsolete-variable-alias 'highlight-changes-passive-string
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'highlight-changes-invisible-string "23.1")
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(defcustom highlight-changes-invisible-string " -Chg"
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"The string used when in Highlight Changes mode and changes are hidden.
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This should be set to nil if no indication is desired, or to
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a string with a leading space."
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:type '(choice string
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(const :tag "None" nil))
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:group 'highlight-changes)
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(defcustom highlight-changes-global-modes t
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"Determine whether a buffer is suitable for global Highlight Changes mode.
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A function means call that function to decide: if it returns non-nil,
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the buffer is suitable.
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A list means the elements are major modes suitable for Highlight
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Changes mode, or a list whose first element is `not' followed by major
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modes which are not suitable.
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A value of t means the buffer is suitable if it is visiting a file and
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its name does not begin with ` ' or `*'.
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A value of nil means no buffers are suitable for `global-highlight-changes-mode'
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\(effectively disabling the mode).
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Example:
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(c-mode c++-mode)
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means that Highlight Changes mode is turned on for buffers in C and C++
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modes only."
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:type '(choice
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(const :tag "all non-special buffers visiting files" t)
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(set :menu-tag "specific modes" :tag "modes"
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:value (not)
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(const :tag "All except these" not)
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(repeat :tag "Modes" :inline t (symbol :tag "mode")))
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(function :menu-tag "determined by function"
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:value buffer-file-name)
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(const :tag "none" nil)
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)
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:group 'highlight-changes)
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(defcustom highlight-changes-global-changes-existing-buffers nil
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"If non-nil, toggling global Highlight Changes mode affects existing buffers.
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Normally, `global-highlight-changes' affects only new buffers (to be
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created). However, if `highlight-changes-global-changes-existing-buffers'
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is non-nil, then turning on `global-highlight-changes' will turn on
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Highlight Changes mode in suitable buffers, and turning the mode off will
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remove it from existing buffers."
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:type 'boolean
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:group 'highlight-changes)
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;; These are for internal use.
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(defvar hilit-chg-list nil)
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(defvar hilit-chg-string " ??")
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(make-variable-buffer-local 'hilit-chg-string)
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;;; Functions...
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;;;###autoload
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(define-minor-mode highlight-changes-mode
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"Toggle Highlight Changes mode.
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With ARG, turn Highlight Changes mode on if and only if arg is positive.
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In Highlight Changes mode changes are recorded with a text property.
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Normally they are displayed in a distinctive face, but command
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\\[highlight-changes-visible-mode] can be used to toggles this
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on and off.
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Other functions for buffers in this mode include:
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\\[highlight-changes-next-change] - move point to beginning of next change
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\\[highlight-changes-previous-change] - move to beginning of previous change
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\\[highlight-changes-remove-highlight] - remove the change face from the region
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\\[highlight-changes-rotate-faces] - rotate different \"ages\" of changes
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through various faces.
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\\[highlight-compare-with-file] - mark text as changed by comparing this
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buffer with the contents of a file
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\\[highlight-compare-buffers] highlights differences between two buffers."
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nil ;; init-value
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hilit-chg-string ;; lighter
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nil ;; keymap
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(if (or (display-color-p)
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(and (fboundp 'x-display-grayscale-p) (x-display-grayscale-p)))
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(progn
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(if (and (eq this-command 'global-highlight-changes-mode)
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(not highlight-changes-global-changes-existing-buffers))
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;; The global mode has toggled the value of the mode variable,
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;; but not other changes have been mode, so we are safe
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;; to retoggle it.
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(setq highlight-changes-mode (not highlight-changes-mode)))
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(if highlight-changes-mode
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;; it is being turned on
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(hilit-chg-set)
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;; mode is turned off
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(hilit-chg-clear)))
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(message "Highlight Changes mode requires color or grayscale display")))
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;;;###autoload
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(define-minor-mode highlight-changes-visible-mode
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"Toggle visiblility of changes when buffer is in Highlight Changes mode.
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This mode only has an effect when Highlight Changes mode is on.
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It allows toggling between whether or not the changed text is displayed
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in a distinctive face.
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The default value can be customized with variable
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`highlight-changes-visibility-initial-state'
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This command does not itself set highlight-changes mode."
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t ;; init-value
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nil ;; lighter
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nil ;; keymap
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(hilit-chg-update)
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)
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(defun hilit-chg-cust-fix-changes-face-list (w wc &optional event)
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;; When customization function `highlight-changes-face-list' inserts a new
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;; face it uses the default face. We don't want the user to modify this
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;; face, so we rename the faces in the list on an insert. The rename is
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;; actually done by copying the faces so user-defined faces still remain
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;; in the same order.
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;; The notifying the parent is needed because without it changes to the
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;; faces are saved but not to the actual list itself.
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(let ((old-list (widget-value w)))
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(if (member 'default old-list)
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(let
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((p (reverse old-list))
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(n (length old-list))
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new-name old-name
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(new-list nil)
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)
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(while p
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(setq old-name (car p))
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(setq new-name (intern (format "highlight-changes-%d" n)))
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(if (eq old-name new-name)
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nil
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;; A new face has been inserted: we don't want to modify the
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;; default face so copy it. Better, though, (I think) is to
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;; make a new face have the same attributes as
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;; the `highlight-changes' face.
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(if (eq old-name 'default)
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(copy-face 'highlight-changes new-name)
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(copy-face old-name new-name)
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))
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(setq new-list (append (list new-name) new-list))
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(setq n (1- n))
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(setq p (cdr p)))
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(if (equal new-list (widget-value w))
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nil ;; (message "notify: no change!")
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(widget-value-set w new-list)
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(widget-setup)
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)
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)
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;; (message "notify: no default here!")
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))
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(let ((parent (widget-get w :parent)))
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(when parent
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(widget-apply parent :notify w event))))
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(defcustom highlight-changes-face-list nil
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"A list of faces used when rotating changes.
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Normally the variable is initialized to nil and the list is created from
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`highlight-changes-colors' when needed. However, you can set this variable
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to any list of faces. You will have to do this if you want faces which
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don't just differ from the `highlight-changes' face by the foreground color.
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Otherwise, this list will be constructed when needed from
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`highlight-changes-colors'."
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:type '(choice
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(repeat
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:notify hilit-chg-cust-fix-changes-face-list
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face )
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(const :tag "Derive from highlight-changes-colors" nil)
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)
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:group 'highlight-changes)
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(defun hilit-chg-map-changes (func &optional start-position end-position)
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"Call function FUNC for each region used by Highlight Changes mode.
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If START-POSITION is nil, (point-min) is used.
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If END-POSITION is nil, (point-max) is used.
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FUNC is called with 3 params: PROPERTY START STOP."
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(let ((start (or start-position (point-min)))
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(limit (or end-position (point-max)))
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prop end)
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(while (and start (< start limit))
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(setq prop (get-text-property start 'hilit-chg))
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(setq end (text-property-not-all start limit 'hilit-chg prop))
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(if prop
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(funcall func prop start (or end limit)))
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(setq start end))))
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(defun hilit-chg-display-changes (&optional beg end)
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"Display face information for Highlight Changes mode.
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An overlay from BEG to END containing a change face is added from the
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information in the text property of type `hilit-chg'.
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This is the opposite of `hilit-chg-hide-changes'."
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(hilit-chg-map-changes 'hilit-chg-make-ov beg end))
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(defun hilit-chg-make-ov (prop start end)
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(or prop
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(error "hilit-chg-make-ov: prop is nil"))
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;; For the region create overlays with a distincive face
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;; and the text property 'hilit-chg.
|
|
(let ((ov (make-overlay start end))
|
|
(face (if (eq prop 'hilit-chg-delete)
|
|
'highlight-changes-delete
|
|
(nth 1 (member prop hilit-chg-list)))))
|
|
(if face
|
|
(progn
|
|
;; We must mark the face, that is the purpose of the overlay.
|
|
(overlay-put ov 'face face)
|
|
;; I don't think we need to set evaporate since we should
|
|
;; be controlling them!
|
|
(overlay-put ov 'evaporate t)
|
|
;; We set the change property so we can tell this is one
|
|
;; of our overlays (so we don't delete someone else's).
|
|
(overlay-put ov 'hilit-chg t)
|
|
)
|
|
(error "hilit-chg-make-ov: no face for prop: %s" prop))))
|
|
|
|
(defun hilit-chg-hide-changes (&optional beg end)
|
|
"Remove face information for Highlight Changes mode.
|
|
|
|
The overlay containing the face is removed, but the text property
|
|
containing the change information is retained.
|
|
|
|
This is the opposite of `hilit-chg-display-changes'."
|
|
(let ((start (or beg (point-min)))
|
|
(limit (or end (point-max))))
|
|
(dolist (p (overlays-in start limit))
|
|
;; don't delete the overlay if it isn't ours!
|
|
(if (overlay-get p 'hilit-chg)
|
|
(delete-overlay p)))))
|
|
|
|
|
|
(defun hilit-chg-fixup (beg end)
|
|
"Fix change overlays in region between BEG and END.
|
|
|
|
Ensure the overlays agree with the changes as determined from
|
|
the text properties of type `hilit-chg'."
|
|
;; Remove or alter overlays in region beg..end
|
|
(remove-overlays beg end 'hilit-chg t)
|
|
(hilit-chg-display-changes beg end))
|
|
|
|
;; Inspired by font-lock. Something like this should be moved to subr.el.
|
|
(defmacro highlight-save-buffer-state (&rest body)
|
|
"Bind variables according to VARLIST and eval BODY restoring buffer state."
|
|
(declare (indent 0) (debug t))
|
|
(let ((modified (make-symbol "modified")))
|
|
`(let* ((,modified (buffer-modified-p))
|
|
(inhibit-modification-hooks t)
|
|
deactivate-mark
|
|
;; So we don't check the file's mtime.
|
|
buffer-file-name
|
|
buffer-file-truename)
|
|
(progn
|
|
,@body)
|
|
(unless ,modified
|
|
(restore-buffer-modified-p nil)))))
|
|
|
|
;;;###autoload
|
|
(defun highlight-changes-remove-highlight (beg end)
|
|
"Remove the change face from the region between BEG and END.
|
|
This allows you to manually remove highlighting from uninteresting changes."
|
|
(interactive "r")
|
|
(highlight-save-buffer-state
|
|
(remove-text-properties beg end '(hilit-chg nil))
|
|
(hilit-chg-fixup beg end)))
|
|
|
|
(defun hilit-chg-set-face-on-change (beg end leng-before
|
|
&optional no-property-change)
|
|
"Record changes and optionally display them in a distinctive face.
|
|
`hilit-chg-set' adds this function to the `after-change-functions' hook."
|
|
;;
|
|
;; This function is called by the `after-change-functions' hook, which
|
|
;; is how we are notified when text is changed.
|
|
;; It is also called from `highlight-compare-with-file'.
|
|
;;
|
|
;; We do NOT want to simply do this if this is an undo command, because
|
|
;; otherwise an undone change shows up as changed. While the properties
|
|
;; are automatically restored by undo, we must fix up the overlay.
|
|
(save-match-data
|
|
(let ((beg-decr 1) (end-incr 1)
|
|
(type 'hilit-chg)
|
|
old)
|
|
(if undo-in-progress
|
|
(if (and highlight-changes-mode
|
|
highlight-changes-visible-mode)
|
|
(hilit-chg-fixup beg end))
|
|
(highlight-save-buffer-state
|
|
(if (and (= beg end) (> leng-before 0))
|
|
;; deletion
|
|
(progn
|
|
;; The eolp and bolp tests are a kludge! But they prevent
|
|
;; rather nasty looking displays when deleting text at the end
|
|
;; of line, such as normal corrections as one is typing and
|
|
;; immediately makes a correction, and when deleting first
|
|
;; character of a line.
|
|
;; (if (= leng-before 1)
|
|
;; (if (eolp)
|
|
;; (setq beg-decr 0 end-incr 0)
|
|
;; (if (bolp)
|
|
;; (setq beg-decr 0))))
|
|
;; (setq beg (max (- beg beg-decr) (point-min)))
|
|
(setq end (min (+ end end-incr) (point-max)))
|
|
(setq type 'hilit-chg-delete))
|
|
;; Not a deletion.
|
|
;; Most of the time the following is not necessary, but
|
|
;; if the current text was marked as a deletion then
|
|
;; the old overlay is still in effect, so if we add some
|
|
;; text then remove the deletion marking, but set it to
|
|
;; changed otherwise its highlighting disappears.
|
|
(if (eq (get-text-property end 'hilit-chg) 'hilit-chg-delete)
|
|
(progn
|
|
(put-text-property end (+ end 1) 'hilit-chg 'hilit-chg)
|
|
(if highlight-changes-visible-mode
|
|
(hilit-chg-fixup beg (+ end 1))))))
|
|
(unless no-property-change
|
|
(put-text-property beg end 'hilit-chg type))
|
|
(if (or highlight-changes-visible-mode no-property-change)
|
|
(hilit-chg-make-ov type beg end)))))))
|
|
|
|
(defun hilit-chg-update ()
|
|
"Update a buffer's highlight changes when visibility changed."
|
|
(if highlight-changes-visible-mode
|
|
;; changes are visible
|
|
(progn
|
|
(setq hilit-chg-string highlight-changes-visible-string)
|
|
(or buffer-read-only
|
|
(hilit-chg-display-changes)))
|
|
;; changes are invisible
|
|
(setq hilit-chg-string highlight-changes-invisible-string)
|
|
(or buffer-read-only
|
|
(hilit-chg-hide-changes))))
|
|
|
|
(defun hilit-chg-set ()
|
|
"Turn on Highlight Changes mode for this buffer."
|
|
(remove-hook 'after-change-functions 'hilit-chg-set-face-on-change t)
|
|
(hilit-chg-make-list)
|
|
(setq highlight-changes-mode t)
|
|
(setq highlight-changes-visible-mode highlight-changes-visibility-initial-state)
|
|
(hilit-chg-update)
|
|
(force-mode-line-update)
|
|
(add-hook 'after-change-functions 'hilit-chg-set-face-on-change nil t))
|
|
|
|
(defun hilit-chg-clear ()
|
|
"Remove Highlight Changes mode for this buffer.
|
|
This removes all saved change information."
|
|
(if buffer-read-only
|
|
;; We print the buffer name because this function could be called
|
|
;; on many buffers from `global-highlight-changes-mode'.
|
|
(message "Cannot remove highlighting from read-only mode buffer %s"
|
|
(buffer-name))
|
|
(remove-hook 'after-change-functions 'hilit-chg-set-face-on-change t)
|
|
(highlight-save-buffer-state
|
|
(hilit-chg-hide-changes)
|
|
(hilit-chg-map-changes
|
|
(lambda (prop start stop)
|
|
(remove-text-properties start stop '(hilit-chg nil)))))
|
|
(setq highlight-changes-mode nil)
|
|
(force-mode-line-update)))
|
|
|
|
|
|
;;;###autoload
|
|
(defun highlight-changes-next-change ()
|
|
"Move to the beginning of the next change, if in Highlight Changes mode."
|
|
(interactive)
|
|
(if highlight-changes-mode
|
|
(let ((start (point))
|
|
prop)
|
|
(setq prop (get-text-property (point) 'hilit-chg))
|
|
(if prop
|
|
;; we are in a change
|
|
(setq start (next-single-property-change (point) 'hilit-chg)))
|
|
(if start
|
|
(setq start (next-single-property-change start 'hilit-chg)))
|
|
(if start
|
|
(goto-char start)
|
|
(message "no next change")))
|
|
(message "This buffer is not in Highlight Changes mode.")))
|
|
|
|
|
|
;;;###autoload
|
|
(defun highlight-changes-previous-change ()
|
|
"Move to the beginning of the previous change, if in Highlight Changes mode."
|
|
(interactive)
|
|
(if highlight-changes-mode
|
|
(let ( (start (point)) (prop nil) )
|
|
(or (bobp)
|
|
(setq prop (get-text-property (1- (point)) 'hilit-chg)))
|
|
(if prop
|
|
;; we are in a change
|
|
(setq start (previous-single-property-change (point) 'hilit-chg)))
|
|
(if start
|
|
(setq start (previous-single-property-change start 'hilit-chg)))
|
|
;; special handling for the case where (point-min) is a change
|
|
(if start
|
|
(setq start (or (previous-single-property-change start 'hilit-chg)
|
|
(if (get-text-property (point-min) 'hilit-chg)
|
|
(point-min)))))
|
|
(if start
|
|
(goto-char start)
|
|
(message "no previous change")))
|
|
(message "This buffer is not in Highlight Changes mode.")))
|
|
|
|
;; ========================================================================
|
|
|
|
(defun hilit-chg-make-list (&optional force)
|
|
"Construct `hilit-chg-list' and `highlight-changes-face-list'."
|
|
;; Constructs highlight-changes-face-list if necessary,
|
|
;; and hilit-chg-list always:
|
|
;; Maybe this should always be called when rotating a face
|
|
;; so we pick up any changes?
|
|
(if (or (null highlight-changes-face-list) ; Don't do it if it
|
|
force) ; already exists unless FORCE non-nil.
|
|
(let ((p highlight-changes-colors)
|
|
(n 1) name)
|
|
(setq highlight-changes-face-list nil)
|
|
(while p
|
|
(setq name (intern (format "highlight-changes-%d" n)))
|
|
(copy-face 'highlight-changes name)
|
|
(set-face-foreground name (car p))
|
|
(setq highlight-changes-face-list
|
|
(append highlight-changes-face-list (list name)))
|
|
(setq p (cdr p))
|
|
(setq n (1+ n)))))
|
|
(setq hilit-chg-list (list 'hilit-chg 'highlight-changes))
|
|
(let ((p highlight-changes-face-list)
|
|
(n 1)
|
|
last-category last-face)
|
|
(while p
|
|
(setq last-category (intern (format "change-%d" n)))
|
|
;; (setq last-face (intern (format "highlight-changes-%d" n)))
|
|
(setq last-face (car p))
|
|
(setq hilit-chg-list
|
|
(append hilit-chg-list
|
|
(list last-category last-face)))
|
|
(setq p (cdr p))
|
|
(setq n (1+ n)))
|
|
(setq hilit-chg-list
|
|
(append hilit-chg-list
|
|
(list last-category last-face)))))
|
|
|
|
(defun hilit-chg-bump-change (prop start end)
|
|
"Increment (age) the Highlight Changes mode text property."
|
|
(let ( new-prop )
|
|
(if (eq prop 'hilit-chg-delete)
|
|
(setq new-prop (nth 2 hilit-chg-list))
|
|
(setq new-prop (nth 2 (member prop hilit-chg-list))))
|
|
(if prop
|
|
(put-text-property start end 'hilit-chg new-prop)
|
|
(message "%d-%d unknown property %s not changed" start end prop))))
|
|
|
|
;;;###autoload
|
|
(defun highlight-changes-rotate-faces ()
|
|
"Rotate the faces if in Highlight Changes mode and the changes are visible.
|
|
|
|
Current changes are displayed in the face described by the first element
|
|
of `highlight-changes-face-list', one level older changes are shown in
|
|
face described by the second element, and so on. Very old changes remain
|
|
shown in the last face in the list.
|
|
|
|
You can automatically rotate colors when the buffer is saved by adding
|
|
this function to `write-file-functions' as a buffer-local value. To do
|
|
this, eval the following in the buffer to be saved:
|
|
|
|
\(add-hook 'write-file-functions 'highlight-changes-rotate-faces nil t)"
|
|
(interactive)
|
|
(when (and highlight-changes-mode highlight-changes-visible-mode)
|
|
(let ((modified (buffer-modified-p))
|
|
(inhibit-modification-hooks t))
|
|
;; The `modified' related code tries to combine two goals: (1) Record the
|
|
;; rotation in `buffer-undo-list' and (2) avoid setting the modified flag
|
|
;; of the current buffer due to the rotation. We do this by inserting (in
|
|
;; `buffer-undo-list') entries restoring buffer-modified-p to nil before
|
|
;; and after the entry for the rotation.
|
|
;; FIXME: this is no good: we need to test the `modified' state at the
|
|
;; time of the undo, not at the time of the "do", otherwise the undo
|
|
;; may erroneously clear the modified flag. --Stef
|
|
;; (unless modified
|
|
;; ;; Install the "before" entry.
|
|
;; (push '(apply restore-buffer-modified-p nil) buffer-undo-list))
|
|
(unwind-protect
|
|
(progn
|
|
;; ensure hilit-chg-list is made and up to date
|
|
(hilit-chg-make-list)
|
|
;; remove our existing overlays
|
|
(hilit-chg-hide-changes)
|
|
;; for each change text property, increment it
|
|
(hilit-chg-map-changes 'hilit-chg-bump-change)
|
|
;; and display them
|
|
(hilit-chg-display-changes))
|
|
(unless modified
|
|
;; Install the "after" entry. FIXME: See above.
|
|
;; (push '(apply restore-buffer-modified-p nil) buffer-undo-list)
|
|
|
|
(restore-buffer-modified-p nil)))))
|
|
;; This always returns nil so it is safe to use in write-file-functions
|
|
nil)
|
|
|
|
;; ========================================================================
|
|
;; Comparing buffers/files
|
|
;; These use ediff to find the differences.
|
|
|
|
(defun highlight-markup-buffers
|
|
(buf-a file-a buf-b file-b &optional markup-a-only)
|
|
"Get differences between two buffers and set highlight changes.
|
|
Both buffers are done unless optional parameter MARKUP-A-ONLY
|
|
is non-nil."
|
|
(eval-and-compile
|
|
(require 'ediff-util))
|
|
(save-window-excursion
|
|
(let* (change-info
|
|
change-a change-b
|
|
a-start a-end len-a
|
|
b-start b-end len-b
|
|
(bufa-modified (buffer-modified-p buf-a))
|
|
(bufb-modified (buffer-modified-p buf-b))
|
|
(buf-a-read-only (with-current-buffer buf-a buffer-read-only))
|
|
(buf-b-read-only (with-current-buffer buf-b buffer-read-only))
|
|
temp-a temp-b)
|
|
(if (and file-a bufa-modified)
|
|
(if (y-or-n-p (format "Save buffer %s? " buf-a))
|
|
(with-current-buffer buf-a
|
|
(save-buffer)
|
|
(setq bufa-modified (buffer-modified-p buf-a)))
|
|
(setq file-a nil)))
|
|
(or file-a
|
|
(setq temp-a (setq file-a (ediff-make-temp-file buf-a nil))))
|
|
|
|
(if (and file-b bufb-modified)
|
|
(if (y-or-n-p (format "Save buffer %s? " buf-b))
|
|
(with-current-buffer buf-b
|
|
(save-buffer)
|
|
(setq bufb-modified (buffer-modified-p buf-b)))
|
|
(setq file-b nil)))
|
|
(or file-b
|
|
(setq temp-b (setq file-b (ediff-make-temp-file buf-b nil))))
|
|
(set-buffer buf-a)
|
|
(highlight-changes-mode 1)
|
|
(or markup-a-only (with-current-buffer buf-b
|
|
(highlight-changes-mode 1)))
|
|
(setq change-info (hilit-chg-get-diff-info buf-a file-a buf-b file-b))
|
|
|
|
|
|
(setq change-a (car change-info))
|
|
(setq change-b (car (cdr change-info)))
|
|
|
|
(hilit-chg-make-list)
|
|
(while change-a
|
|
(setq a-start (nth 0 (car change-a)))
|
|
(setq a-end (nth 1 (car change-a)))
|
|
(setq b-start (nth 0 (car change-b)))
|
|
(setq b-end (nth 1 (car change-b)))
|
|
(setq len-a (- a-end a-start))
|
|
(setq len-b (- b-end b-start))
|
|
(set-buffer buf-a)
|
|
(hilit-chg-set-face-on-change a-start a-end len-b buf-a-read-only)
|
|
(or markup-a-only
|
|
(with-current-buffer buf-b
|
|
(hilit-chg-set-face-on-change b-start b-end len-a
|
|
buf-b-read-only)
|
|
))
|
|
(setq change-a (cdr change-a))
|
|
(setq change-b (cdr change-b)))
|
|
(or bufa-modified
|
|
(with-current-buffer buf-a (set-buffer-modified-p nil)))
|
|
(or bufb-modified
|
|
(with-current-buffer buf-b (set-buffer-modified-p nil)))
|
|
(if temp-a
|
|
(delete-file temp-a))
|
|
(if temp-b
|
|
(delete-file temp-b)))
|
|
))
|
|
|
|
;;;###autoload
|
|
(defun highlight-compare-buffers (buf-a buf-b)
|
|
"Compare two buffers and highlight the differences.
|
|
|
|
The default is the current buffer and the one in the next window.
|
|
|
|
If either buffer is modified and is visiting a file, you are prompted
|
|
to save the file.
|
|
|
|
Unless the buffer is unmodified and visiting a file, the buffer is
|
|
written to a temporary file for comparison.
|
|
|
|
If a buffer is read-only, differences will be highlighted but no property
|
|
changes are made, so \\[highlight-changes-next-change] and
|
|
\\[highlight-changes-previous-change] will not work."
|
|
(interactive
|
|
(list
|
|
(get-buffer (read-buffer "buffer-a " (current-buffer) t))
|
|
(get-buffer
|
|
(read-buffer "buffer-b "
|
|
(window-buffer (next-window (selected-window))) t))))
|
|
(let ((file-a (buffer-file-name buf-a))
|
|
(file-b (buffer-file-name buf-b)))
|
|
(highlight-markup-buffers buf-a file-a buf-b file-b)
|
|
))
|
|
|
|
;;;###autoload
|
|
(defun highlight-compare-with-file (file-b)
|
|
"Compare this buffer with a file, and highlight differences.
|
|
|
|
If the buffer has a backup filename, it is used as the default when
|
|
this function is called interactively.
|
|
|
|
If the current buffer is visiting the file being compared against, it
|
|
also will have its differences highlighted. Otherwise, the file is
|
|
read in temporarily but the buffer is deleted.
|
|
|
|
If the buffer is read-only, differences will be highlighted but no property
|
|
changes are made, so \\[highlight-changes-next-change] and
|
|
\\[highlight-changes-previous-change] will not work."
|
|
(interactive
|
|
(let ((file buffer-file-name)
|
|
(file-name nil)
|
|
(file-dir nil))
|
|
(and file
|
|
(setq file-name (file-name-nondirectory file)
|
|
file-dir (file-name-directory file)))
|
|
(setq file-name (make-backup-file-name file-name))
|
|
(unless (file-exists-p file-name)
|
|
(setq file-name nil))
|
|
(list (read-file-name
|
|
"Find to compare with: " ;; prompt
|
|
file-dir ;; directory
|
|
nil ;; default
|
|
nil ;; existing
|
|
file-name) ;; initial
|
|
)))
|
|
(let* ((buf-a (current-buffer))
|
|
(file-a (buffer-file-name))
|
|
(existing-buf (get-file-buffer file-b))
|
|
(buf-b (or existing-buf
|
|
(find-file-noselect file-b)))
|
|
(buf-b-read-only (with-current-buffer buf-b buffer-read-only)))
|
|
(highlight-markup-buffers buf-a file-a buf-b file-b (not existing-buf))
|
|
(unless existing-buf
|
|
(kill-buffer buf-b))
|
|
))
|
|
|
|
|
|
(defun hilit-chg-get-diff-info (buf-a file-a buf-b file-b)
|
|
(let ((e nil) x y) ;; e is set by function hilit-chg-get-diff-list-hk
|
|
(ediff-setup buf-a file-a buf-b file-b
|
|
nil nil ; buf-c file-C
|
|
'hilit-chg-get-diff-list-hk
|
|
(list (cons 'ediff-job-name 'something))
|
|
)
|
|
(ediff-with-current-buffer e (ediff-really-quit nil))
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(list x y)))
|
|
|
|
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(defun hilit-chg-get-diff-list-hk ()
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|
;; x and y are dynamically bound by hilit-chg-get-diff-info
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|
;; which calls this function as a hook
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|
(defvar x) ;; placate the byte-compiler
|
|
(defvar y)
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|
(setq e (current-buffer))
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|
(let ((n 0) extent p va vb a b)
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|
(setq x nil y nil) ;; x and y are bound by hilit-chg-get-diff-info
|
|
(while (< n ediff-number-of-differences)
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|
(ediff-make-fine-diffs n)
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|
(setq va (ediff-get-fine-diff-vector n 'A))
|
|
;; va is a vector if there are fine differences
|
|
(if va
|
|
(setq a (append va nil))
|
|
;; if not, get the unrefined difference
|
|
(setq va (ediff-get-difference n 'A))
|
|
(setq a (list (elt va 0))))
|
|
;; a list a list
|
|
(setq p a)
|
|
(while p
|
|
(setq extent (list (overlay-start (car p))
|
|
(overlay-end (car p))))
|
|
(setq p (cdr p))
|
|
(setq x (append x (list extent) )));; while p
|
|
;;
|
|
(setq vb (ediff-get-fine-diff-vector n 'B))
|
|
;; vb is a vector
|
|
(if vb
|
|
(setq b (append vb nil))
|
|
;; if not, get the unrefined difference
|
|
(setq vb (ediff-get-difference n 'B))
|
|
(setq b (list (elt vb 0))))
|
|
;; b list a list
|
|
(setq p b)
|
|
(while p
|
|
(setq extent (list (overlay-start (car p))
|
|
(overlay-end (car p))))
|
|
(setq p (cdr p))
|
|
(setq y (append y (list extent) )))
|
|
(setq n (1+ n)));; while
|
|
;; ediff-quit doesn't work here.
|
|
;; No point in returning a value, since this is a hook function.
|
|
))
|
|
|
|
;; ======================= global-highlight-changes-mode ==============
|
|
|
|
;;;###autoload
|
|
(define-globalized-minor-mode global-highlight-changes-mode
|
|
highlight-changes-mode highlight-changes-mode-turn-on)
|
|
|
|
(define-obsolete-function-alias
|
|
'global-highlight-changes
|
|
'global-highlight-changes-mode "23.1")
|
|
|
|
(defun highlight-changes-mode-turn-on ()
|
|
"See if Highlight Changes mode should be turned on for this buffer.
|
|
This is called when `global-highlight-changes-mode' is turned on."
|
|
(or highlight-changes-mode ; do nothing if already on
|
|
(if
|
|
(cond
|
|
((null highlight-changes-global-modes)
|
|
nil)
|
|
((functionp highlight-changes-global-modes)
|
|
(funcall highlight-changes-global-modes))
|
|
((listp highlight-changes-global-modes)
|
|
(if (eq (car-safe highlight-changes-global-modes) 'not)
|
|
(not (memq major-mode (cdr highlight-changes-global-modes)))
|
|
(memq major-mode highlight-changes-global-modes)))
|
|
(t
|
|
(and
|
|
(not (string-match "^[ *]" (buffer-name)))
|
|
(buffer-file-name))))
|
|
(highlight-changes-mode 1))
|
|
))
|
|
|
|
|
|
;;;; Desktop support.
|
|
|
|
;; Called by `desktop-create-buffer' to restore `highlight-changes-mode'.
|
|
(defun hilit-chg-desktop-restore (desktop-buffer-locals)
|
|
(highlight-changes-mode
|
|
(or (cdr (assq 'highlight-changes-mode desktop-buffer-locals)) 1)))
|
|
|
|
(add-to-list 'desktop-minor-mode-handlers
|
|
'(highlight-changes-mode . hilit-chg-desktop-restore))
|
|
|
|
(add-to-list 'desktop-locals-to-save 'highlight-changes-mode)
|
|
|
|
;; ===================== debug ==================
|
|
;; For debug & test use:
|
|
;;
|
|
;; (defun hilit-chg-debug-show (&optional beg end)
|
|
;; (interactive)
|
|
;; (message "--- hilit-chg-debug-show ---")
|
|
;; (hilit-chg-map-changes '(lambda (prop start end)
|
|
;; (message "%d-%d: %s" start end prop)
|
|
;; )
|
|
;; beg end
|
|
;; ))
|
|
;;
|
|
;; ================== end of debug ===============
|
|
|
|
(provide 'hilit-chg)
|
|
|
|
;; arch-tag: de00301d-5bad-44da-aa82-e0e010b0c463
|
|
;;; hilit-chg.el ends here
|