605 lines
25 KiB
EmacsLisp
605 lines
25 KiB
EmacsLisp
;;; magit-ediff.el --- Ediff extension for Magit -*- lexical-binding:t -*-
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;; Copyright (C) 2008-2022 The Magit Project Contributors
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;; Author: Jonas Bernoulli <jonas@bernoul.li>
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;; Maintainer: Jonas Bernoulli <jonas@bernoul.li>
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;; SPDX-License-Identifier: GPL-3.0-or-later
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;; Magit is free software: you can redistribute it and/or modify it
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;; 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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;;
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;; Magit is distributed in the hope that it will be useful, but WITHOUT
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;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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;; License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with Magit. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This library provides basic support for Ediff.
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;;; Code:
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(require 'magit)
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(require 'ediff)
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(require 'smerge-mode)
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(defvar smerge-ediff-buf)
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(defvar smerge-ediff-windows)
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;;; Options
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(defgroup magit-ediff nil
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"Ediff support for Magit."
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:link '(info-link "(magit)Ediffing")
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:group 'magit-extensions)
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(defcustom magit-ediff-quit-hook
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'(magit-ediff-cleanup-auxiliary-buffers
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magit-ediff-restore-previous-winconf)
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"Hooks to run after finishing Ediff, when that was invoked using Magit.
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The hooks are run in the Ediff control buffer. This is similar
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to `ediff-quit-hook' but takes the needs of Magit into account.
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The `ediff-quit-hook' is ignored by Ediff sessions which were
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invoked using Magit."
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:package-version '(magit . "2.2.0")
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:group 'magit-ediff
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:type 'hook
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:get #'magit-hook-custom-get
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:options '(magit-ediff-cleanup-auxiliary-buffers
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magit-ediff-restore-previous-winconf))
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(defcustom magit-ediff-dwim-resolve-function #'magit-ediff-resolve-rest
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"The function `magit-ediff-dwim' uses to resolve conflicts."
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:package-version '(magit . "3.4.0")
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:group 'magit-ediff
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:type '(choice (const magit-ediff-resolve-rest)
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(const magit-ediff-resolve-all)
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(const magit-git-mergetool)))
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(defcustom magit-ediff-dwim-show-on-hunks nil
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"Whether `magit-ediff-dwim' runs show variants on hunks.
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If non-nil, `magit-ediff-show-staged' or
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`magit-ediff-show-unstaged' are called based on what section the
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hunk is in. Otherwise, `magit-ediff-dwim' runs
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`magit-ediff-stage' when point is on an uncommitted hunk."
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:package-version '(magit . "2.2.0")
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:group 'magit-ediff
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:type 'boolean)
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(defcustom magit-ediff-show-stash-with-index t
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"Whether `magit-ediff-show-stash' shows the state of the index.
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If non-nil, use a third Ediff buffer to distinguish which changes
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in the stash were staged. In cases where the stash contains no
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staged changes, fall back to a two-buffer Ediff.
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More specifically, a stash is a merge commit, stash@{N}, with
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potentially three parents.
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* stash@{N}^1 represents the `HEAD' commit at the time the stash
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was created.
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* stash@{N}^2 records any changes that were staged when the stash
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was made.
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* stash@{N}^3, if it exists, contains files that were untracked
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when stashing.
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If this option is non-nil, `magit-ediff-show-stash' will run
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Ediff on a file using three buffers: one for stash@{N}, another
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for stash@{N}^1, and a third for stash@{N}^2.
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Otherwise, Ediff uses two buffers, comparing
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stash@{N}^1..stash@{N}. Along with any unstaged changes, changes
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in the index commit, stash@{N}^2, will be shown in this
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comparison unless they conflicted with changes in the working
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tree at the time of stashing."
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:package-version '(magit . "2.6.0")
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:group 'magit-ediff
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:type 'boolean)
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(defvar magit-ediff-use-indirect-buffers nil
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"Whether to use indirect buffers.
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Ediff already does a lot of buffer and file shuffling and I
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recommend you do not further complicate that by enabling this.")
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;;; Commands
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(defvar magit-ediff-previous-winconf nil)
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;;;###autoload (autoload 'magit-ediff "magit-ediff" nil)
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(transient-define-prefix magit-ediff ()
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"Show differences using the Ediff package."
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:info-manual "(ediff)"
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["Ediff"
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[("E" "Dwim" magit-ediff-dwim)
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("s" "Stage" magit-ediff-stage)]
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[("m" "Resolve rest" magit-ediff-resolve-rest)
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("M" "Resolve all conflicts" magit-ediff-resolve-all)
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("t" "Resolve using mergetool" magit-git-mergetool)]
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[("u" "Show unstaged" magit-ediff-show-unstaged)
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("i" "Show staged" magit-ediff-show-staged)
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("w" "Show worktree" magit-ediff-show-working-tree)]
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[("c" "Show commit" magit-ediff-show-commit)
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("r" "Show range" magit-ediff-compare)
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("z" "Show stash" magit-ediff-show-stash)]])
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(defmacro magit-ediff-buffers (a b &optional c setup quit file)
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"Run Ediff on two or three buffers.
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This is a wrapper around `ediff-buffers-internal'.
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A, B and C have the form (GET-BUFFER CREATE-BUFFER). If
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GET-BUFFER returns a non-nil value, then that buffer is used and
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it is not killed when exiting Ediff. Otherwise CREATE-BUFFER
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must return a buffer and that is killed when exiting Ediff.
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If non-nil, SETUP must be a function. It is called without
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arguments after Ediff is done setting up buffers.
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If non-nil, QUIT must be a function. It is added to
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`ediff-quit-hook' and is called without arguments.
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If FILE is non-nil, then perform a merge. The merge result
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is put in FILE."
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(let (get make kill (char ?A))
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(dolist (spec (list a b c))
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(if (not spec)
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(push nil make)
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(pcase-let ((`(,g ,m) spec))
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(let ((b (intern (format "buf%c" char))))
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(push `(,b ,g) get)
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;; This is an unfortunate complication that I have added for
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;; the benefit of one user. Pretend we used this instead:
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;; (push `(or ,b ,m) make)
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(push `(if ,b
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(if magit-ediff-use-indirect-buffers
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(prog1 (make-indirect-buffer
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,b
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(generate-new-buffer-name (buffer-name ,b))
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t)
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(setq ,b nil))
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,b)
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,m)
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make)
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(push `(unless ,b
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;; For merge jobs Ediff switches buffer names around.
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;; See (if ediff-merge-job ...) in `ediff-setup'.
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(let ((var ,(if (and file (= char ?C))
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'ediff-ancestor-buffer
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(intern (format "ediff-buffer-%c" char)))))
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(ediff-kill-buffer-carefully var)))
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kill))
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(cl-incf char))))
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(setq get (nreverse get))
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(setq make (nreverse make))
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(setq kill (nreverse kill))
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(let ((mconf (cl-gensym "conf"))
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(mfile (cl-gensym "file")))
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`(magit-with-toplevel
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(let ((,mconf (current-window-configuration))
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(,mfile ,file)
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,@get)
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(ediff-buffers-internal
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,@make
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(list ,@(and setup (list setup))
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(lambda ()
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;; We do not want to kill buffers that existed before
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;; Ediff was invoked, so we cannot use Ediff's default
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;; quit functions. Ediff splits quitting across two
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;; hooks for merge jobs but we only ever use one.
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(setq-local ediff-quit-merge-hook nil)
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(setq-local ediff-quit-hook
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(list
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,@(and quit (list quit))
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(lambda ()
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,@kill
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(let ((magit-ediff-previous-winconf ,mconf))
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(run-hooks 'magit-ediff-quit-hook)))))))
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(pcase (list ,(and c t) (and ,mfile t))
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('(nil nil) 'ediff-buffers)
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('(nil t) 'ediff-merge-buffers)
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('(t nil) 'ediff-buffers3)
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('(t t) 'ediff-merge-buffers-with-ancestor))
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,mfile))))))
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;;;###autoload
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(defun magit-ediff-resolve-all (file)
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"Resolve all conflicts in the FILE at point using Ediff.
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If there is no file at point or if it doesn't have any unmerged
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changes, then prompt for a file.
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See info node `(magit) Ediffing' for more information about this
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and alternative commands."
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(interactive (list (magit-read-unmerged-file)))
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(magit-with-toplevel
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(let* ((revA (or (magit-name-branch "HEAD")
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(magit-commit-p "HEAD")))
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(revB (cl-find-if (lambda (head) (file-exists-p (magit-git-dir head)))
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'("MERGE_HEAD" "CHERRY_PICK_HEAD" "REVERT_HEAD")))
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(revB (or (magit-name-branch revB)
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(magit-commit-p revB)))
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(revC (magit-commit-p (magit-git-string "merge-base" revA revB)))
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(fileA (magit--rev-file-name file revA revB))
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(fileB (magit--rev-file-name file revB revA))
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(fileC (or (magit--rev-file-name file revC revA)
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(magit--rev-file-name file revC revB))))
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;; Ediff assumes that the FILE where it is going to store the merge
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;; result does not exist yet, so move the existing file out of the
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;; way. If a buffer visits FILE, then we have to kill that upfront.
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(when-let ((buffer (find-buffer-visiting file)))
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(when (and (buffer-modified-p buffer)
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(not (y-or-n-p (format "Save buffer %s %s? "
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(buffer-name buffer)
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"(cannot continue otherwise)"))))
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(user-error "Abort"))
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(kill-buffer buffer))
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(let ((orig (concat file ".ORIG")))
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(when (file-exists-p orig)
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(rename-file orig (make-temp-name (concat orig "_"))))
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(rename-file file orig))
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(let ((setup (lambda ()
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;; Use the same conflict marker style as Git uses.
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(setq-local ediff-combination-pattern
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'("<<<<<<< HEAD" A
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,(format "||||||| %s" revC) Ancestor
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"=======" B
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,(format ">>>>>>> %s" revB)))))
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(quit (lambda ()
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;; For merge jobs Ediff switches buffer names around.
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;; At this point `ediff-buffer-C' no longer refer to
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;; the ancestor buffer but to the merge result buffer.
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;; See (if ediff-merge-job ...) in `ediff-setup'.
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(when (buffer-live-p ediff-buffer-C)
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(with-current-buffer ediff-buffer-C
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(save-buffer)
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(save-excursion
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(goto-char (point-min))
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(unless (re-search-forward "^<<<<<<< " nil t)
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(magit-stage-file file))))))))
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(if fileC
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(magit-ediff-buffers
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((magit-get-revision-buffer revA fileA)
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(magit-find-file-noselect revA fileA))
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((magit-get-revision-buffer revB fileB)
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(magit-find-file-noselect revB fileB))
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((magit-get-revision-buffer revC fileC)
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(magit-find-file-noselect revC fileC))
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setup quit file)
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(magit-ediff-buffers
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((magit-get-revision-buffer revA fileA)
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(magit-find-file-noselect revA fileA))
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((magit-get-revision-buffer revB fileB)
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(magit-find-file-noselect revB fileB))
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nil setup quit file))))))
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;;;###autoload
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(defun magit-ediff-resolve-rest (file)
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"Resolve outstanding conflicts in the FILE at point using Ediff.
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If there is no file at point or if it doesn't have any unmerged
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changes, then prompt for a file.
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See info node `(magit) Ediffing' for more information about this
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and alternative commands."
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(interactive (list (magit-read-unmerged-file)))
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(magit-with-toplevel
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(with-current-buffer (find-file-noselect file)
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(smerge-ediff)
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(setq-local
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ediff-quit-hook
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(lambda ()
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(let ((bufC ediff-buffer-C)
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(bufS smerge-ediff-buf))
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(with-current-buffer bufS
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(when (yes-or-no-p (format "Conflict resolution finished; save %s? "
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buffer-file-name))
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(erase-buffer)
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(insert-buffer-substring bufC)
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(save-buffer))))
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(when (buffer-live-p ediff-buffer-A) (kill-buffer ediff-buffer-A))
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(when (buffer-live-p ediff-buffer-B) (kill-buffer ediff-buffer-B))
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(when (buffer-live-p ediff-buffer-C) (kill-buffer ediff-buffer-C))
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(when (buffer-live-p ediff-ancestor-buffer)
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(kill-buffer ediff-ancestor-buffer))
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(let ((magit-ediff-previous-winconf smerge-ediff-windows))
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(run-hooks 'magit-ediff-quit-hook)))))))
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;;;###autoload
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(defun magit-ediff-stage (file)
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"Stage and unstage changes to FILE using Ediff.
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FILE has to be relative to the top directory of the repository."
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(interactive
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(let ((files (magit-tracked-files)))
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(list (magit-completing-read "Selectively stage file" files nil t nil nil
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(car (member (magit-current-file) files))))))
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(magit-with-toplevel
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(let* ((bufA (magit-get-revision-buffer "HEAD" file))
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(bufB (magit-get-revision-buffer "{index}" file))
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(lockB (and bufB (buffer-local-value 'buffer-read-only bufB)))
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(bufC (get-file-buffer file))
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;; Use the same encoding for all three buffers or we
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;; may end up changing the file in an unintended way.
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(bufC* (or bufC (find-file-noselect file)))
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(coding-system-for-read
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(buffer-local-value 'buffer-file-coding-system bufC*))
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(bufA* (magit-find-file-noselect-1 "HEAD" file t))
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(bufB* (magit-find-file-index-noselect file t)))
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(setf (buffer-local-value 'buffer-read-only bufB*) nil)
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(magit-ediff-buffers
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(bufA bufA*)
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(bufB bufB*)
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(bufC bufC*)
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nil
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(lambda ()
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(when (buffer-live-p ediff-buffer-B)
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(when lockB
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(setf (buffer-local-value 'buffer-read-only bufB) t))
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(when (buffer-modified-p ediff-buffer-B)
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(with-current-buffer ediff-buffer-B
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(magit-update-index))))
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(when (and (buffer-live-p ediff-buffer-C)
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(buffer-modified-p ediff-buffer-C))
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(with-current-buffer ediff-buffer-C
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(when (y-or-n-p (format "Save file %s? " buffer-file-name))
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(save-buffer)))))))))
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;;;###autoload
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(defun magit-ediff-compare (revA revB fileA fileB)
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"Compare REVA:FILEA with REVB:FILEB using Ediff.
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FILEA and FILEB have to be relative to the top directory of the
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repository. If REVA or REVB is nil, then this stands for the
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working tree state.
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If the region is active, use the revisions on the first and last
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line of the region. With a prefix argument, instead of diffing
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the revisions, choose a revision to view changes along, starting
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at the common ancestor of both revisions (i.e., use a \"...\"
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range)."
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(interactive
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(pcase-let ((`(,revA ,revB) (magit-ediff-compare--read-revisions
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nil current-prefix-arg)))
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(nconc (list revA revB)
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(magit-ediff-read-files revA revB))))
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(magit-ediff-buffers
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((if revA (magit-get-revision-buffer revA fileA) (get-file-buffer fileA))
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(if revA (magit-find-file-noselect revA fileA) (find-file-noselect fileA)))
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((if revB (magit-get-revision-buffer revB fileB) (get-file-buffer fileB))
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(if revB (magit-find-file-noselect revB fileB) (find-file-noselect fileB)))))
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(defun magit-ediff-compare--read-revisions (&optional arg mbase)
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(let ((input (or arg (magit-diff-read-range-or-commit
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"Compare range or commit"
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nil mbase))))
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(--if-let (magit-split-range input)
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(-cons-to-list it)
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(list input nil))))
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(defun magit-ediff-read-files (revA revB &optional fileB)
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"Read file in REVB, return it and the corresponding file in REVA.
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When FILEB is non-nil, use this as REVB's file instead of
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prompting for it."
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(unless (and fileB (member fileB (magit-revision-files revB)))
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(setq fileB
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(or (and fileB
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magit-buffer-log-files
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(derived-mode-p 'magit-log-mode)
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(member "--follow" magit-buffer-log-args)
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(cdr (assoc fileB
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(magit-renamed-files
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revB
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(oref (car (oref magit-root-section children))
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value)))))
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(magit-read-file-choice
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(format "File to compare between %s and %s"
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revA (or revB "the working tree"))
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(magit-changed-files revA revB)
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(format "No changed files between %s and %s"
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revA (or revB "the working tree"))))))
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(list (or (car (member fileB (magit-revision-files revA)))
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(cdr (assoc fileB (magit-renamed-files revB revA)))
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(magit-read-file-choice
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(format "File in %s to compare with %s in %s"
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revA fileB (or revB "the working tree"))
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(magit-changed-files revB revA)
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(format "No files have changed between %s and %s"
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revA revB)))
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fileB))
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;;;###autoload
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(defun magit-ediff-dwim ()
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"Compare, stage, or resolve using Ediff.
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This command tries to guess what file, and what commit or range
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the user wants to compare, stage, or resolve using Ediff. It
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might only be able to guess either the file, or range or commit,
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in which case the user is asked about the other. It might not
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always guess right, in which case the appropriate `magit-ediff-*'
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command has to be used explicitly. If it cannot read the user's
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mind at all, then it asks the user for a command to run."
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(interactive)
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(magit-section-case
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(hunk (save-excursion
|
|
(goto-char (oref (oref it parent) start))
|
|
(magit-ediff-dwim)))
|
|
(t
|
|
(let ((range (magit-diff--dwim))
|
|
(file (magit-current-file))
|
|
command revA revB)
|
|
(pcase range
|
|
((and (guard (not magit-ediff-dwim-show-on-hunks))
|
|
(or 'unstaged 'staged))
|
|
(setq command (if (magit-anything-unmerged-p)
|
|
magit-ediff-dwim-resolve-function
|
|
#'magit-ediff-stage)))
|
|
('unstaged (setq command #'magit-ediff-show-unstaged))
|
|
('staged (setq command #'magit-ediff-show-staged))
|
|
(`(commit . ,value)
|
|
(setq command #'magit-ediff-show-commit)
|
|
(setq revB value))
|
|
(`(stash . ,value)
|
|
(setq command #'magit-ediff-show-stash)
|
|
(setq revB value))
|
|
((pred stringp)
|
|
(pcase-let ((`(,a ,b) (magit-ediff-compare--read-revisions range)))
|
|
(setq command #'magit-ediff-compare)
|
|
(setq revA a)
|
|
(setq revB b)))
|
|
(_
|
|
(when (derived-mode-p 'magit-diff-mode)
|
|
(pcase (magit-diff-type)
|
|
('committed (pcase-let ((`(,a ,b)
|
|
(magit-ediff-compare--read-revisions
|
|
magit-buffer-range)))
|
|
(setq revA a)
|
|
(setq revB b)))
|
|
((guard (not magit-ediff-dwim-show-on-hunks))
|
|
(setq command #'magit-ediff-stage))
|
|
('unstaged (setq command #'magit-ediff-show-unstaged))
|
|
('staged (setq command #'magit-ediff-show-staged))
|
|
('undefined (setq command nil))
|
|
(_ (setq command nil))))))
|
|
(cond ((not command)
|
|
(call-interactively
|
|
(magit-read-char-case
|
|
"Failed to read your mind; do you want to " t
|
|
(?c "[c]ommit" #'magit-ediff-show-commit)
|
|
(?r "[r]ange" #'magit-ediff-compare)
|
|
(?s "[s]tage" #'magit-ediff-stage)
|
|
(?m "[m] resolve remaining conflicts"
|
|
#'magit-ediff-resolve-rest)
|
|
(?M "[M] resolve all conflicts"
|
|
#'magit-ediff-resolve-all))))
|
|
((eq command #'magit-ediff-compare)
|
|
(apply #'magit-ediff-compare revA revB
|
|
(magit-ediff-read-files revA revB file)))
|
|
((eq command #'magit-ediff-show-commit)
|
|
(magit-ediff-show-commit revB))
|
|
((eq command #'magit-ediff-show-stash)
|
|
(magit-ediff-show-stash revB))
|
|
(file
|
|
(funcall command file))
|
|
(t
|
|
(call-interactively command)))))))
|
|
|
|
;;;###autoload
|
|
(defun magit-ediff-show-staged (file)
|
|
"Show staged changes using Ediff.
|
|
|
|
This only allows looking at the changes; to stage, unstage,
|
|
and discard changes using Ediff, use `magit-ediff-stage'.
|
|
|
|
FILE must be relative to the top directory of the repository."
|
|
(interactive
|
|
(list (magit-read-file-choice "Show staged changes for file"
|
|
(magit-staged-files)
|
|
"No staged files")))
|
|
(magit-ediff-buffers ((magit-get-revision-buffer "HEAD" file)
|
|
(magit-find-file-noselect "HEAD" file))
|
|
((get-buffer (concat file ".~{index}~"))
|
|
(magit-find-file-index-noselect file t))))
|
|
|
|
;;;###autoload
|
|
(defun magit-ediff-show-unstaged (file)
|
|
"Show unstaged changes using Ediff.
|
|
|
|
This only allows looking at the changes; to stage, unstage,
|
|
and discard changes using Ediff, use `magit-ediff-stage'.
|
|
|
|
FILE must be relative to the top directory of the repository."
|
|
(interactive
|
|
(list (magit-read-file-choice "Show unstaged changes for file"
|
|
(magit-unstaged-files)
|
|
"No unstaged files")))
|
|
(magit-ediff-buffers ((get-buffer (concat file ".~{index}~"))
|
|
(magit-find-file-index-noselect file t))
|
|
((get-file-buffer file)
|
|
(find-file-noselect file))))
|
|
|
|
;;;###autoload
|
|
(defun magit-ediff-show-working-tree (file)
|
|
"Show changes between `HEAD' and working tree using Ediff.
|
|
FILE must be relative to the top directory of the repository."
|
|
(interactive
|
|
(list (magit-read-file-choice "Show changes in file"
|
|
(magit-changed-files "HEAD")
|
|
"No changed files")))
|
|
(magit-ediff-buffers ((magit-get-revision-buffer "HEAD" file)
|
|
(magit-find-file-noselect "HEAD" file))
|
|
((get-file-buffer file)
|
|
(find-file-noselect file))))
|
|
|
|
;;;###autoload
|
|
(defun magit-ediff-show-commit (commit)
|
|
"Show changes introduced by COMMIT using Ediff."
|
|
(interactive (list (magit-read-branch-or-commit "Revision")))
|
|
(let ((revA (concat commit "^"))
|
|
(revB commit))
|
|
(apply #'magit-ediff-compare
|
|
revA revB
|
|
(magit-ediff-read-files revA revB (magit-current-file)))))
|
|
|
|
;;;###autoload
|
|
(defun magit-ediff-show-stash (stash)
|
|
"Show changes introduced by STASH using Ediff.
|
|
`magit-ediff-show-stash-with-index' controls whether a
|
|
three-buffer Ediff is used in order to distinguish changes in the
|
|
stash that were staged."
|
|
(interactive (list (magit-read-stash "Stash")))
|
|
(pcase-let* ((revA (concat stash "^1"))
|
|
(revB (concat stash "^2"))
|
|
(revC stash)
|
|
(`(,fileA ,fileC) (magit-ediff-read-files revA revC))
|
|
(fileB fileC))
|
|
(if (and magit-ediff-show-stash-with-index
|
|
(member fileA (magit-changed-files revB revA)))
|
|
(magit-ediff-buffers
|
|
((magit-get-revision-buffer revA fileA)
|
|
(magit-find-file-noselect revA fileA))
|
|
((magit-get-revision-buffer revB fileB)
|
|
(magit-find-file-noselect revB fileB))
|
|
((magit-get-revision-buffer revC fileC)
|
|
(magit-find-file-noselect revC fileC)))
|
|
(magit-ediff-compare revA revC fileA fileC))))
|
|
|
|
(defun magit-ediff-cleanup-auxiliary-buffers ()
|
|
(let* ((ctl-buf ediff-control-buffer)
|
|
(ctl-win (ediff-get-visible-buffer-window ctl-buf))
|
|
(ctl-frm ediff-control-frame)
|
|
(main-frame (cond ((window-live-p ediff-window-A)
|
|
(window-frame ediff-window-A))
|
|
((window-live-p ediff-window-B)
|
|
(window-frame ediff-window-B)))))
|
|
(ediff-kill-buffer-carefully ediff-diff-buffer)
|
|
(ediff-kill-buffer-carefully ediff-custom-diff-buffer)
|
|
(ediff-kill-buffer-carefully ediff-fine-diff-buffer)
|
|
(ediff-kill-buffer-carefully ediff-tmp-buffer)
|
|
(ediff-kill-buffer-carefully ediff-error-buffer)
|
|
(ediff-kill-buffer-carefully ediff-msg-buffer)
|
|
(ediff-kill-buffer-carefully ediff-debug-buffer)
|
|
(when (boundp 'ediff-patch-diagnostics)
|
|
(ediff-kill-buffer-carefully ediff-patch-diagnostics))
|
|
(cond ((and (ediff-window-display-p)
|
|
(frame-live-p ctl-frm))
|
|
(delete-frame ctl-frm))
|
|
((window-live-p ctl-win)
|
|
(delete-window ctl-win)))
|
|
(ediff-kill-buffer-carefully ctl-buf)
|
|
(when (frame-live-p main-frame)
|
|
(select-frame main-frame))))
|
|
|
|
(defun magit-ediff-restore-previous-winconf ()
|
|
(set-window-configuration magit-ediff-previous-winconf))
|
|
|
|
;;; _
|
|
(provide 'magit-ediff)
|
|
;;; magit-ediff.el ends here
|