;;; diff-hl-margin.el --- Highlight buffer changes on margins -*- lexical-binding: t -*-
-;; This file is not part of GNU Emacs.
+;; Copyright (C) 2012-2013 Free Software Foundation, Inc.
-;; This file is free software: you can redistribute it and/or modify
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
-;; This file is distributed in the hope that it will be useful,
+;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
(defvar diff-hl-margin-old-highlight-function nil)
+(defgroup diff-hl-margin nil
+ "Highlight buffer changes on margin"
+ :group 'diff-hl)
+
+(defcustom diff-hl-margin-side 'left
+ "Which margin to use for indicators."
+ :type '(choice (const left)
+ (const right))
+ :set (lambda (var value)
+ (let ((on diff-hl-margin-mode))
+ (when on (diff-hl-margin-mode -1))
+ (set-default var value)
+ (when on (diff-hl-margin-mode 1)))))
+
;;;###autoload
(define-minor-mode diff-hl-margin-mode
"Toggle displaying `diff-hl-mode' highlights on the margin."
:lighter "" :global t
- (if diff-hl-margin-mode
- (progn
- (setq diff-hl-margin-old-highlight-function diff-hl-highlight-function
- diff-hl-highlight-function 'diff-hl-highlight-on-margin)
- (setq-default left-margin-width 1)
- (dolist (buffer (buffer-list))
- (with-current-buffer buffer
- (cond
- (diff-hl-mode
- (diff-hl-update))
- (diff-hl-dired-mode
- (diff-hl-dired-update))))))
- (setq diff-hl-highlight-function diff-hl-margin-old-highlight-function
- diff-hl-margin-old-highlight-function nil)
- (setq-default left-margin-width 0)
- (dolist (buffer (buffer-list))
- (with-current-buffer buffer
- (cond
- (diff-hl-mode
- (diff-hl-update))
- (diff-hl-dired-mode
- (diff-hl-dired-update))))))
+ (let ((width-var (intern (format "%s-margin-width" diff-hl-margin-side))))
+ (if diff-hl-margin-mode
+ (progn
+ (setq diff-hl-margin-old-highlight-function diff-hl-highlight-function
+ diff-hl-highlight-function 'diff-hl-highlight-on-margin)
+ (set-default width-var 1))
+ (setq diff-hl-highlight-function diff-hl-margin-old-highlight-function
+ diff-hl-margin-old-highlight-function nil)
+ (set-default width-var 0)))
+ (dolist (buffer (buffer-list))
+ (with-current-buffer buffer
+ (cond
+ (diff-hl-mode
+ (diff-hl-update))
+ (diff-hl-dired-mode
+ (diff-hl-dired-update)))))
(walk-windows (lambda (win) (set-window-buffer win (window-buffer win)))))
(defvar diff-hl-margin-spec-cache
(loop for (type . char) in '((insert . "+") (delete . "-")
(change . "|") (unknown . "?"))
- collect (cons type
- (propertize
- " " 'display
- `((margin left-margin)
- ,(propertize char 'face
- (intern (format "diff-hl-%s" type))))))))
+ nconc
+ (loop for side in '(left right)
+ collect
+ (cons (cons type side)
+ (propertize
+ " " 'display
+ `((margin ,(intern (format "%s-margin" side)))
+ ,(propertize char 'face
+ (intern (format "diff-hl-%s" type)))))))))
(defun diff-hl-highlight-on-margin (ovl type _shape)
- (let ((spec (cdr (assoc type diff-hl-margin-spec-cache))))
+ (let ((spec (cdr (assoc (cons type diff-hl-margin-side)
+ diff-hl-margin-spec-cache))))
(overlay-put ovl 'before-string spec)))
(provide 'diff-hl-margin)