--- /dev/null
+;; Copyright (C) 2012-2013 Free Software Foundation, Inc.
+
+;; Author: Jonathan Hayase <PythonNut@gmail.com>
+;; URL: https://github.com/dgutov/diff-hl
+
+;; 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.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'diff-hl)
+
+(defvar diff-hl-flydiff-modified-tick 0)
+(defvar diff-hl-flydiff-timer)
+(make-variable-buffer-local 'diff-hl-flydiff-modified-tick)
+
+;; Polyfill concrete revisions for vc-git-working-revision in Emacs 24.4, 24.5
+(when (version<= emacs-version "24.5")
+ (with-eval-after-load 'vc-git
+ (defun vc-git--symbolic-ref (file)
+ (or
+ (vc-file-getprop file 'vc-git-symbolic-ref)
+ (let* (process-file-side-effects
+ (str (vc-git--run-command-string nil "symbolic-ref" "HEAD")))
+ (vc-file-setprop file 'vc-git-symbolic-ref
+ (if str
+ (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
+ (match-string 2 str)
+ str))))))
+
+ (defun diff-hl-flydiff/vc-git-working-revision (_file)
+ "Git-specific version of `vc-working-revision'."
+ (let (process-file-side-effects)
+ (vc-git--rev-parse "HEAD")))
+
+ (defun diff-hl-flydiff/vc-git-mode-line-string (file)
+ "Return a string for `vc-mode-line' to put in the mode line for FILE."
+ (let* ((rev (vc-working-revision file))
+ (disp-rev (or (vc-git--symbolic-ref file)
+ (substring rev 0 7)))
+ (def-ml (vc-default-mode-line-string 'Git file))
+ (help-echo (get-text-property 0 'help-echo def-ml)))
+ (propertize (replace-regexp-in-string (concat rev "\\'") disp-rev def-ml t t)
+ 'help-echo (concat help-echo "\nCurrent revision: " rev))))
+
+ (advice-add 'vc-git-working-revision :override
+ #'diff-hl-flydiff/vc-git-working-revision)
+ (advice-add 'vc-git-mode-line-string :override
+ #'diff-hl-flydiff/vc-git-mode-line-string)))
+
+(defun diff-hl-flydiff-make-temp-file-name (file rev &optional manual)
+ "Return a backup file name for REV or the current version of FILE.
+If MANUAL is non-nil it means that a name for backups created by
+the user should be returned."
+ (let* ((auto-save-file-name-transforms
+ `((".*" ,temporary-file-directory t))))
+ (expand-file-name
+ (concat (make-auto-save-file-name)
+ ".~" (subst-char-in-string
+ ?/ ?_ rev)
+ (unless manual ".") "~")
+ temporary-file-directory)))
+
+(defun diff-hl-flydiff-create-revision (file revision)
+ "Read REVISION of FILE into a buffer and return the buffer."
+ (let ((automatic-backup (diff-hl-flydiff-make-temp-file-name file revision))
+ (filebuf (get-file-buffer file))
+ (filename (diff-hl-flydiff-make-temp-file-name file revision 'manual)))
+ (unless (file-exists-p filename)
+ (if (file-exists-p automatic-backup)
+ (rename-file automatic-backup filename nil)
+ (with-current-buffer filebuf
+ (let ((failed t)
+ (coding-system-for-read 'no-conversion)
+ (coding-system-for-write 'no-conversion))
+ (unwind-protect
+ (with-temp-file filename
+ (let ((outbuf (current-buffer)))
+ ;; Change buffer to get local value of
+ ;; vc-checkout-switches.
+ (with-current-buffer filebuf
+ (vc-call find-revision file revision outbuf))))
+ (setq failed nil)
+ (when (and failed (file-exists-p filename))
+ (delete-file filename)))))))
+ filename))
+
+(defun diff-hl-flydiff-buffer-with-head ()
+ "View the differences between BUFFER and its associated file.
+This requires the external program `diff' to be in your `exec-path'."
+ (interactive)
+ (vc-ensure-vc-buffer)
+ (with-current-buffer (get-buffer (current-buffer))
+ (let ((rev (diff-hl-flydiff-create-revision
+ buffer-file-name
+ (vc-working-revision buffer-file-name
+ (vc-responsible-backend buffer-file-name))))
+ (temporary-file-directory
+ (if (file-directory-p "/dev/shm/")
+ "/dev/shm/"
+ temporary-file-directory)))
+ (diff-no-select rev (current-buffer) "-U 0" 'noasync
+ (get-buffer-create " *diff-hl-diff*")))))
+
+
+(defun diff-hl-flydiff/update (old-fun &optional auto)
+ (unless (and auto
+ (or
+ (= diff-hl-flydiff-modified-tick (buffer-modified-tick))
+ (file-remote-p default-directory)
+ (not (buffer-modified-p))))
+ (funcall old-fun)))
+
+(defun diff-hl-flydiff/changes (&rest args)
+ (let* ((file buffer-file-name)
+ (backend (vc-backend file)))
+ (when backend
+ (let ((state (vc-state file backend)))
+ (cond
+ ((or
+ (buffer-modified-p)
+ (eq state 'edited)
+ (and (eq state 'up-to-date)
+ ;; VC state is stale in after-revert-hook.
+ (or revert-buffer-in-progress-p
+ ;; Diffing against an older revision.
+ diff-hl-reference-revision)))
+ (let (diff-auto-refine-mode res)
+ (with-current-buffer (diff-hl-flydiff-buffer-with-head)
+ (goto-char (point-min))
+ (unless (eobp)
+ (ignore-errors
+ (diff-beginning-of-hunk t))
+ (while (looking-at diff-hunk-header-re-unified)
+ (let ((line (string-to-number (match-string 3)))
+ (len (let ((m (match-string 4)))
+ (if m (string-to-number m) 1)))
+ (beg (point)))
+ (diff-end-of-hunk)
+ (let* ((inserts (diff-count-matches "^\\+" beg (point)))
+ (deletes (diff-count-matches "^-" beg (point)))
+ (type (cond ((zerop deletes) 'insert)
+ ((zerop inserts) 'delete)
+ (t 'change))))
+ (when (eq type 'delete)
+ (setq len 1)
+ (cl-incf line))
+ (push (list line len type) res))))))
+ (setq diff-hl-flydiff-modified-tick (buffer-modified-tick))
+ (nreverse res)))
+ ((eq state 'added)
+ `((1 ,(line-number-at-pos (point-max)) insert)))
+ ((eq state 'removed)
+ `((1 ,(line-number-at-pos (point-max)) delete))))))))
+
+(defun diff-hl-flydiff/overlay-modified (&rest args))
+
+;;;###autoload
+(define-minor-mode diff-hl-flydiff-mode
+ "Highlight diffs on-the-fly"
+ :lighter ""
+ :global t
+ (if diff-hl-flydiff-mode
+ (progn
+ (require 'nadvice)
+ (advice-add 'diff-hl-update :around
+ #'diff-hl-flydiff/update)
+ (advice-add 'diff-hl-changes :override
+ #'diff-hl-flydiff/changes)
+ (advice-add 'diff-hl-overlay-modified :override
+ #'diff-hl-flydiff/overlay-modified)
+
+ (remove-hook 'after-change-functions #'diff-hl-edit t)
+ (setq diff-hl-flydiff-timer
+ (run-with-idle-timer 0.3 t #'diff-hl-update t)))
+
+ (advice-remove 'diff-hl-update #'diff-hl-flydiff/update)
+ (advice-remove 'diff-hl-changes #'diff-hl-flydiff/changes)
+ (advice-remove 'diff-hl-overlay-modified
+ #'diff-hl-flydiff/overlay-modified)
+
+ (cancel-timer diff-hl-flydiff-timer)
+ (when diff-hl-mode
+ (add-hook 'after-change-functions 'diff-hl-edit nil t))))
+
+(provide 'diff-hl-flydiff)