;;; diff-hl.el --- Highlight uncommitted changes using VC -*- lexical-binding: t -*-
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;; Copyright (C) 2012-2016 Free Software Foundation, Inc.
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;; Author: Dmitry Gutov <dgutov@yandex.ru>
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;; URL: https://github.com/dgutov/diff-hl
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;; Keywords: vc, diff
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;; Version: 1.8.4
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;; Package-Requires: ((cl-lib "0.2") (emacs "24.3"))
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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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;; `diff-hl-mode' highlights uncommitted changes on the side of the
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;; window (using the fringe, by default), allows you to jump between
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;; the hunks and revert them selectively.
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;; Provided commands:
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;;
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;; `diff-hl-diff-goto-hunk' C-x v =
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;; `diff-hl-revert-hunk' C-x v n
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;; `diff-hl-previous-hunk' C-x v [
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;; `diff-hl-next-hunk' C-x v ]
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;;
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;; The mode takes advantage of `smartrep' if it is installed.
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;; Add either of the following to your init file.
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;;
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;; To use it in all buffers:
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;;
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;; (global-diff-hl-mode)
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;;
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;; Only in `prog-mode' buffers, with `vc-dir' integration:
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;;
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;; (add-hook 'prog-mode-hook 'turn-on-diff-hl-mode)
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;; (add-hook 'vc-dir-mode-hook 'turn-on-diff-hl-mode)
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;;; Code:
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(require 'fringe)
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(require 'diff-mode)
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(require 'vc)
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(require 'vc-dir)
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(eval-when-compile
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(require 'cl-lib)
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(require 'vc-git)
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(require 'vc-hg)
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(require 'face-remap)
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(declare-function smartrep-define-key 'smartrep))
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(defgroup diff-hl nil
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"VC diff highlighting on the side of a window"
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:group 'vc)
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(defface diff-hl-insert
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'((default :inherit diff-added)
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(((class color)) :foreground "green4"))
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"Face used to highlight inserted lines."
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:group 'diff-hl)
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(defface diff-hl-delete
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'((default :inherit diff-removed)
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(((class color)) :foreground "red3"))
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"Face used to highlight deleted lines."
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:group 'diff-hl)
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(defface diff-hl-change
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'((default :foreground "blue3")
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(((class color) (min-colors 88) (background light))
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:background "#ddddff")
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(((class color) (min-colors 88) (background dark))
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:background "#333355"))
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"Face used to highlight changed lines."
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:group 'diff-hl)
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(defcustom diff-hl-command-prefix (kbd "C-x v")
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"The prefix for all `diff-hl' commands."
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:group 'diff-hl
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:type 'string)
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(defcustom diff-hl-draw-borders t
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"Non-nil to draw borders around fringe indicators."
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:group 'diff-hl
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:type 'boolean)
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(defcustom diff-hl-highlight-function 'diff-hl-highlight-on-fringe
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"Function to highlight the current line. Its arguments are
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overlay, change type and position within a hunk."
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:group 'diff-hl
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:type 'function)
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(defcustom diff-hl-fringe-bmp-function 'diff-hl-fringe-bmp-from-pos
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"Function to choose the fringe bitmap for a given change type
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and position within a hunk. Should accept two arguments."
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:group 'diff-hl
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:type '(choice (const diff-hl-fringe-bmp-from-pos)
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(const diff-hl-fringe-bmp-from-type)
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function))
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(defcustom diff-hl-fringe-face-function 'diff-hl-fringe-face-from-type
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"Function to choose the fringe face for a given change type
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and position within a hunk. Should accept two arguments."
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:group 'diff-hl
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:type 'function)
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(defcustom diff-hl-side 'left
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"Which side to use for indicators."
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:type '(choice (const left)
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(const right))
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:set (lambda (var value)
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(let ((on (bound-and-true-p global-diff-hl-mode)))
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(when on (global-diff-hl-mode -1))
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(set-default var value)
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(when on (global-diff-hl-mode 1)))))
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(defvar diff-hl-reference-revision nil
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"Revision to diff against. nil means the most recent one.")
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(defun diff-hl-define-bitmaps ()
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(let* ((scale (if (and (boundp 'text-scale-mode-amount)
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(numberp text-scale-mode-amount))
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(expt text-scale-mode-step text-scale-mode-amount)
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1))
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(spacing (or (and (display-graphic-p) (default-value 'line-spacing)) 0))
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(h (+ (ceiling (* (frame-char-height) scale))
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(if (floatp spacing)
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(truncate (* (frame-char-height) spacing))
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spacing)))
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(w (min (frame-parameter nil (intern (format "%s-fringe" diff-hl-side)))
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16))
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(middle (make-vector h (expt 2 (1- w))))
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(ones (1- (expt 2 w)))
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(top (copy-sequence middle))
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(bottom (copy-sequence middle))
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(single (copy-sequence middle)))
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(aset top 0 ones)
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(aset bottom (1- h) ones)
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(aset single 0 ones)
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(aset single (1- h) ones)
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(define-fringe-bitmap 'diff-hl-bmp-top top h w 'top)
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(define-fringe-bitmap 'diff-hl-bmp-middle middle h w 'center)
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(define-fringe-bitmap 'diff-hl-bmp-bottom bottom h w 'bottom)
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(define-fringe-bitmap 'diff-hl-bmp-single single h w 'top)
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(define-fringe-bitmap 'diff-hl-bmp-i [3 3 0 3 3 3 3 3 3 3] nil 2 'center)
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(let* ((w2 (* (/ w 2) 2))
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;; When fringes are disabled, it's easier to fix up the width,
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;; instead of doing nothing (#20).
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(w2 (if (zerop w2) 2 w2))
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(delete-row (- (expt 2 (1- w2)) 2))
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(middle-pos (1- (/ w2 2)))
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(middle-bit (expt 2 middle-pos))
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(insert-bmp (make-vector w2 (* 3 middle-bit))))
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(define-fringe-bitmap 'diff-hl-bmp-delete (make-vector 2 delete-row) w2 w2)
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(aset insert-bmp 0 0)
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(aset insert-bmp middle-pos delete-row)
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(aset insert-bmp (1+ middle-pos) delete-row)
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(aset insert-bmp (1- w2) 0)
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(define-fringe-bitmap 'diff-hl-bmp-insert insert-bmp w2 w2)
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)))
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(defun diff-hl-maybe-define-bitmaps ()
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(when (window-system) ;; No fringes in the console.
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(unless (fringe-bitmap-p 'diff-hl-bmp-empty)
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(diff-hl-define-bitmaps)
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(define-fringe-bitmap 'diff-hl-bmp-empty [0] 1 1 'center))))
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(defvar diff-hl-spec-cache (make-hash-table :test 'equal))
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(defun diff-hl-fringe-spec (type pos side)
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(let* ((key (list type pos side
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diff-hl-fringe-face-function
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diff-hl-fringe-bmp-function))
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(val (gethash key diff-hl-spec-cache)))
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(unless val
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(let* ((face-sym (funcall diff-hl-fringe-face-function type pos))
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(bmp-sym (funcall diff-hl-fringe-bmp-function type pos)))
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(setq val (propertize " " 'display `((,(intern (format "%s-fringe" side))
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,bmp-sym ,face-sym))))
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(puthash key val diff-hl-spec-cache)))
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val))
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(defun diff-hl-fringe-face-from-type (type _pos)
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(intern (format "diff-hl-%s" type)))
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(defun diff-hl-fringe-bmp-from-pos (_type pos)
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(intern (format "diff-hl-bmp-%s" pos)))
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(defun diff-hl-fringe-bmp-from-type (type _pos)
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(cl-case type
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(unknown 'question-mark)
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(change 'exclamation-mark)
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(ignored 'diff-hl-bmp-i)
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(t (intern (format "diff-hl-bmp-%s" type)))))
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(defvar vc-svn-diff-switches)
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(defmacro diff-hl-with-diff-switches (body)
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`(let ((vc-git-diff-switches
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;; https://github.com/dgutov/diff-hl/issues/67
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(cons "-U0"
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;; https://github.com/dgutov/diff-hl/issues/9
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(and (boundp 'vc-git-diff-switches)
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(listp vc-git-diff-switches)
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(cl-remove-if-not
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(lambda (arg)
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(member arg '("--histogram" "--patience" "--minimal")))
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vc-git-diff-switches))))
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(vc-hg-diff-switches nil)
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(vc-svn-diff-switches nil)
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(vc-diff-switches '("-U0"))
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,@(when (boundp 'vc-disable-async-diff)
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'((vc-disable-async-diff t))))
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,body))
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(defun diff-hl-modified-p (state)
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(or (eq state 'edited)
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(and (eq state 'up-to-date)
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;; VC state is stale in after-revert-hook.
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(or revert-buffer-in-progress-p
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;; Diffing against an older revision.
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diff-hl-reference-revision))))
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(defun diff-hl-changes-buffer (file backend)
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(let ((buf-name " *diff-hl* "))
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(diff-hl-with-diff-switches
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(vc-call-backend backend 'diff (list file)
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diff-hl-reference-revision nil
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buf-name))
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buf-name))
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(defun diff-hl-changes ()
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(let* ((file buffer-file-name)
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(backend (vc-backend file)))
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(when backend
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(let ((state (vc-state file backend)))
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(cond
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((diff-hl-modified-p state)
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(let* (diff-auto-refine-mode res)
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(with-current-buffer (diff-hl-changes-buffer file backend)
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(goto-char (point-min))
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(unless (eobp)
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(ignore-errors
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(diff-beginning-of-hunk t))
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(while (looking-at diff-hunk-header-re-unified)
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(let ((line (string-to-number (match-string 3)))
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(len (let ((m (match-string 4)))
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(if m (string-to-number m) 1)))
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(beg (point)))
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(diff-end-of-hunk)
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(let* ((inserts (diff-count-matches "^\\+" beg (point)))
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(deletes (diff-count-matches "^-" beg (point)))
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(type (cond ((zerop deletes) 'insert)
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((zerop inserts) 'delete)
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(t 'change))))
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(when (eq type 'delete)
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(setq len 1)
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(cl-incf line))
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(push (list line len type) res))))))
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(nreverse res)))
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((eq state 'added)
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`((1 ,(line-number-at-pos (point-max)) insert)))
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((eq state 'removed)
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`((1 ,(line-number-at-pos (point-max)) delete))))))))
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(defun diff-hl-update ()
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(let ((changes (diff-hl-changes))
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(current-line 1))
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(diff-hl-remove-overlays)
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(save-excursion
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(save-restriction
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(widen)
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(goto-char (point-min))
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(dolist (c changes)
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(cl-destructuring-bind (line len type) c
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(forward-line (- line current-line))
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(setq current-line line)
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(let ((hunk-beg (point)))
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(while (cl-plusp len)
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(diff-hl-add-highlighting
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type
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(cond
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((not diff-hl-draw-borders) 'empty)
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((and (= len 1) (= line current-line)) 'single)
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((= len 1) 'bottom)
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((= line current-line) 'top)
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(t 'middle)))
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(forward-line 1)
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(cl-incf current-line)
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(cl-decf len))
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(let ((h (make-overlay hunk-beg (point)))
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(hook '(diff-hl-overlay-modified)))
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(overlay-put h 'diff-hl t)
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(overlay-put h 'diff-hl-hunk t)
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(overlay-put h 'modification-hooks hook)
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(overlay-put h 'insert-in-front-hooks hook)
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(overlay-put h 'insert-behind-hooks hook)))))))))
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(defun diff-hl-add-highlighting (type shape)
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(let ((o (make-overlay (point) (point))))
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(overlay-put o 'diff-hl t)
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(funcall diff-hl-highlight-function o type shape)
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o))
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(defun diff-hl-highlight-on-fringe (ovl type shape)
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(overlay-put ovl 'before-string (diff-hl-fringe-spec type shape
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diff-hl-side)))
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(defun diff-hl-remove-overlays (&optional beg end)
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(save-restriction
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(widen)
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(dolist (o (overlays-in (or beg (point-min)) (or end (point-max))))
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(when (overlay-get o 'diff-hl) (delete-overlay o)))))
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(defun diff-hl-overlay-modified (ov after-p _beg _end &optional _length)
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"Delete the hunk overlay and all our line overlays inside it."
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(unless after-p
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(when (overlay-buffer ov)
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(diff-hl-remove-overlays (overlay-start ov) (overlay-end ov))
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(delete-overlay ov))))
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(defvar diff-hl-timer nil)
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(defun diff-hl-edit (_beg _end _len)
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"DTRT when we've `undo'-ne the buffer into unmodified state."
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(when undo-in-progress
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(when diff-hl-timer
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(cancel-timer diff-hl-timer))
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(setq diff-hl-timer
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(run-with-idle-timer 0.01 nil #'diff-hl-after-undo (current-buffer)))))
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(defun diff-hl-after-undo (buffer)
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(with-current-buffer buffer
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(unless (buffer-modified-p)
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(diff-hl-update))))
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(defun diff-hl-diff-goto-hunk ()
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"Run VC diff command and go to the line corresponding to the current."
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(interactive)
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(vc-buffer-sync)
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(let* ((line (line-number-at-pos))
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(buffer (current-buffer)))
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(vc-diff-internal t (vc-deduce-fileset) diff-hl-reference-revision nil t)
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(vc-exec-after `(if (< (line-number-at-pos (point-max)) 3)
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(with-current-buffer ,buffer (diff-hl-remove-overlays))
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(diff-hl-diff-skip-to ,line)
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(setq vc-sentinel-movepoint (point))))))
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(defun diff-hl-diff-skip-to (line)
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"In `diff-mode', skip to the hunk and line corresponding to LINE
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in the source file, or the last line of the hunk above it."
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(diff-hunk-next)
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(let (found)
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(while (and (looking-at diff-hunk-header-re-unified) (not found))
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(let ((hunk-line (string-to-number (match-string 3)))
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(len (let ((m (match-string 4)))
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(if m (string-to-number m) 1))))
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(if (> line (+ hunk-line len))
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(diff-hunk-next)
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(setq found t)
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(if (< line hunk-line)
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;; Retreat to the previous hunk.
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(forward-line -1)
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(let ((to-go (1+ (- line hunk-line))))
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(while (cl-plusp to-go)
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(forward-line 1)
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(unless (looking-at "^-")
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(cl-decf to-go))))))))))
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(defun diff-hl-revert-hunk ()
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"Revert the diff hunk with changes at or above the point."
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(interactive)
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(vc-buffer-sync)
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(let ((diff-buffer (generate-new-buffer-name "*diff-hl*"))
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(buffer (current-buffer))
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(line (save-excursion
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(unless (diff-hl-hunk-overlay-at (point))
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(diff-hl-previous-hunk))
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(line-number-at-pos)))
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(fileset (vc-deduce-fileset)))
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(unwind-protect
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(progn
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(vc-diff-internal nil fileset diff-hl-reference-revision nil
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nil diff-buffer)
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(vc-exec-after
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`(let (beg-line end-line)
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(when (eobp)
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(with-current-buffer ,buffer (diff-hl-remove-overlays))
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(user-error "Buffer is up-to-date"))
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(let (diff-auto-refine-mode)
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(diff-hl-diff-skip-to ,line))
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(save-excursion
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(while (looking-at "[-+]") (forward-line 1))
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(setq end-line (line-number-at-pos (point)))
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(unless (eobp) (diff-split-hunk)))
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(unless (looking-at "[-+]") (forward-line -1))
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(while (looking-at "[-+]") (forward-line -1))
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(setq beg-line (line-number-at-pos (point)))
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(unless (looking-at "@")
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(forward-line 1)
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(diff-split-hunk))
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(let ((wbh (window-body-height)))
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(if (>= wbh (- end-line beg-line))
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(recenter (/ (+ wbh (- beg-line end-line) 2) 2))
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(recenter 1)))
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(when diff-auto-refine-mode
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(diff-refine-hunk))
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(unless (yes-or-no-p (format "Revert current hunk in %s? "
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,(cl-caadr fileset)))
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(user-error "Revert canceled"))
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(let ((diff-advance-after-apply-hunk nil))
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(diff-apply-hunk t))
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(with-current-buffer ,buffer
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(save-buffer))
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(message "Hunk reverted"))))
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(quit-windows-on diff-buffer t))))
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(defun diff-hl-hunk-overlay-at (pos)
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(cl-loop for o in (overlays-in pos (1+ pos))
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when (overlay-get o 'diff-hl-hunk)
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return o))
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(defun diff-hl-next-hunk (&optional backward)
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"Go to the beginning of the next hunk in the current buffer."
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(interactive)
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(let ((pos (save-excursion
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(catch 'found
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(while (not (if backward (bobp) (eobp)))
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(goto-char (if backward
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(previous-overlay-change (point))
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(next-overlay-change (point))))
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(let ((o (diff-hl-hunk-overlay-at (point))))
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(when (and o (= (overlay-start o) (point)))
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(throw 'found (overlay-start o)))))))))
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(if pos
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(goto-char pos)
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(user-error "No further hunks found"))))
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(defun diff-hl-previous-hunk ()
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"Go to the beginning of the previous hunk in the current buffer."
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(interactive)
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(diff-hl-next-hunk t))
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(defun diff-hl-mark-hunk ()
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(interactive)
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(let ((hunk (diff-hl-hunk-overlay-at (point))))
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(unless hunk
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(user-error "No hunk at point"))
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(goto-char (overlay-start hunk))
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(push-mark (overlay-end hunk) nil t)))
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(defvar diff-hl-command-map
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(let ((map (make-sparse-keymap)))
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(define-key map "n" 'diff-hl-revert-hunk)
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(define-key map "[" 'diff-hl-previous-hunk)
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(define-key map "]" 'diff-hl-next-hunk)
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map))
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(fset 'diff-hl-command-map diff-hl-command-map)
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(defvar diff-hl-lighter ""
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"Mode line lighter for Diff Hl.
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The value of this variable is a mode line template as in
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`mode-line-format'.")
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;;;###autoload
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(define-minor-mode diff-hl-mode
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"Toggle VC diff highlighting."
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:lighter diff-hl-lighter
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:keymap `(([remap vc-diff] . diff-hl-diff-goto-hunk)
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(,diff-hl-command-prefix . diff-hl-command-map))
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(if diff-hl-mode
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(progn
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(diff-hl-maybe-define-bitmaps)
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(add-hook 'after-save-hook 'diff-hl-update nil t)
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(add-hook 'after-change-functions 'diff-hl-edit nil t)
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(add-hook (if vc-mode
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;; Defer until the end of this hook, so that its
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;; elements can modify the update behavior.
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'diff-hl-mode-on-hook
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;; If we're only opening the file now,
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;; `vc-find-file-hook' likely hasn't run yet, so
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;; let's wait until the state information is
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;; saved, in order not to fetch it twice.
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'find-file-hook)
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'diff-hl-update t t)
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(add-hook 'vc-checkin-hook 'diff-hl-update nil t)
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(add-hook 'after-revert-hook 'diff-hl-update nil t)
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;; Magit does call `auto-revert-handler', but it usually
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;; doesn't do much, because `buffer-stale--default-function'
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;; doesn't care about changed VC state.
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;; https://github.com/magit/magit/issues/603
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(add-hook 'magit-revert-buffer-hook 'diff-hl-update nil t)
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;; Magit versions 2.0-2.3 don't do the above and call this
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;; instead, but only when they dosn't call `revert-buffer':
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(add-hook 'magit-not-reverted-hook 'diff-hl-update nil t)
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(add-hook 'auto-revert-mode-hook 'diff-hl-update nil t)
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(add-hook 'text-scale-mode-hook 'diff-hl-define-bitmaps nil t))
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(remove-hook 'after-save-hook 'diff-hl-update t)
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(remove-hook 'after-change-functions 'diff-hl-edit t)
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(remove-hook 'find-file-hook 'diff-hl-update t)
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(remove-hook 'vc-checkin-hook 'diff-hl-update t)
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(remove-hook 'after-revert-hook 'diff-hl-update t)
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(remove-hook 'magit-revert-buffer-hook 'diff-hl-update t)
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(remove-hook 'magit-not-reverted-hook 'diff-hl-update t)
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(remove-hook 'auto-revert-mode-hook 'diff-hl-update t)
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(remove-hook 'text-scale-mode-hook 'diff-hl-define-bitmaps t)
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(diff-hl-remove-overlays)))
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(when (require 'smartrep nil t)
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(let (smart-keys)
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(cl-labels ((scan (map)
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(map-keymap
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(lambda (event binding)
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(if (consp binding)
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(scan binding)
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(when (characterp event)
|
(push (cons (string event) binding) smart-keys))))
|
map)))
|
(scan diff-hl-command-map)
|
(smartrep-define-key diff-hl-mode-map diff-hl-command-prefix smart-keys))))
|
|
(declare-function magit-toplevel "magit-git")
|
(declare-function magit-unstaged-files "magit-git")
|
|
(defun diff-hl-magit-post-refresh ()
|
(let* ((topdir (magit-toplevel))
|
(modified-files
|
(mapcar (lambda (file) (expand-file-name file topdir))
|
(magit-unstaged-files t)))
|
(unmodified-states '(up-to-date ignored unregistered)))
|
(dolist (buf (buffer-list))
|
(when (and (buffer-local-value 'diff-hl-mode buf)
|
(not (buffer-modified-p buf))
|
;; Solve the "cloned indirect buffer" problem
|
;; (diff-hl-mode could be non-nil there, even if
|
;; buffer-file-name is nil):
|
(buffer-file-name buf)
|
(file-in-directory-p (buffer-file-name buf) topdir)
|
(file-exists-p (buffer-file-name buf)))
|
(with-current-buffer buf
|
(let* ((file buffer-file-name)
|
(backend (vc-backend file)))
|
(when backend
|
(cond
|
((member file modified-files)
|
(when (memq (vc-state file) unmodified-states)
|
(vc-state-refresh file backend))
|
(diff-hl-update))
|
((not (memq (vc-state file backend) unmodified-states))
|
(vc-state-refresh file backend)
|
(diff-hl-update))))))))))
|
|
(defun diff-hl-dir-update ()
|
(dolist (pair (if (vc-dir-marked-files)
|
(vc-dir-marked-only-files-and-states)
|
(vc-dir-child-files-and-states)))
|
(when (eq 'up-to-date (cdr pair))
|
(let ((buffer (find-buffer-visiting (car pair))))
|
(when buffer
|
(with-current-buffer buffer
|
(diff-hl-remove-overlays)))))))
|
|
(define-minor-mode diff-hl-dir-mode
|
"Toggle `diff-hl-mode' integration in a `vc-dir-mode' buffer."
|
:lighter ""
|
(if diff-hl-dir-mode
|
(add-hook 'vc-checkin-hook 'diff-hl-dir-update t t)
|
(remove-hook 'vc-checkin-hook 'diff-hl-dir-update t)))
|
|
;;;###autoload
|
(defun turn-on-diff-hl-mode ()
|
"Turn on `diff-hl-mode' or `diff-hl-dir-mode' in a buffer if appropriate."
|
(cond
|
(buffer-file-name
|
(diff-hl-mode 1))
|
((eq major-mode 'vc-dir-mode)
|
(diff-hl-dir-mode 1))))
|
|
;;;###autoload
|
(define-globalized-minor-mode global-diff-hl-mode diff-hl-mode
|
turn-on-diff-hl-mode :after-hook (diff-hl-global-mode-change))
|
|
(defun diff-hl-global-mode-change ()
|
(unless global-diff-hl-mode
|
(dolist (buf (buffer-list))
|
(with-current-buffer buf
|
(when diff-hl-dir-mode
|
(diff-hl-dir-mode -1))))))
|
|
(provide 'diff-hl)
|
|
;;; diff-hl.el ends here
|
