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625 lines
23 KiB
EmacsLisp
625 lines
23 KiB
EmacsLisp
;;; gitmerge.el --- help merge one Emacs branch into another
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;; Copyright (C) 2010-2020 Free Software Foundation, Inc.
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;; Authors: David Engster <deng@randomsample.de>
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;; Stefan Monnier <monnier@iro.umontreal.ca>
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;; Keywords: maint
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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 <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Rewrite of bzrmerge.el, but using git.
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;;
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;; In a nutshell: For merging foo into master, do
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;;
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;; - 'git checkout master' in Emacs repository
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;; - Start Emacs, cd to Emacs repository
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;; - M-x gitmerge
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;; - Choose branch 'foo' or 'origin/foo', depending on whether you
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;; like to merge from a local tracking branch or from the remote
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;; (does not make a difference if the local tracking branch is
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;; up-to-date).
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;; - Mark commits you'd like to skip, meaning to only merge their
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;; metadata (merge strategy 'ours').
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;; - Hit 'm' to start merging. Skipped commits will be merged separately.
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;; - If conflicts cannot be resolved automatically, you'll have to do
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;; it manually. In that case, resolve the conflicts and restart
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;; gitmerge, which will automatically resume. It will add resolved
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;; files, commit the pending merge and continue merging the rest.
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;; - Inspect master branch, and if everything looks OK, push.
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;;; Code:
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(require 'vc-git)
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(require 'smerge-mode)
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(defvar gitmerge-skip-regexp
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;; We used to include "sync" in there, but in my experience it only
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;; caused false positives. --Stef
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(let ((skip "back[- ]?port\\|cherry picked from commit\\|\
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\\(do\\( no\\|n['’]\\)t\\|no need to\\) merge\\|not to be merged\\|\
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bump Emacs version\\|Auto-commit"))
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(if noninteractive skip
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;; "Regenerate" is quite prone to false positives.
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;; We only want to skip merging things like AUTHORS and ldefs-boot.
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;; These should be covered by "bump version" and "auto-commit".
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;; It doesn't do much harm if we merge one of those files by mistake.
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;; So it's better to err on the side of false negatives.
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(concat skip "\\|re-?generate\\|from trunk")))
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"Regexp matching logs of revisions that might be skipped.
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`gitmerge-missing' will ask you if it should skip any matches.")
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(defvar gitmerge-minimum-missing 10
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"Minimum number of missing commits to consider merging in batch mode.")
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(defvar gitmerge-status-file (expand-file-name "gitmerge-status"
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user-emacs-directory)
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"File where missing commits will be saved between sessions.")
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(defvar gitmerge-ignore-branches-regexp
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"origin/\\(\\(HEAD\\|master\\)$\\|\\(old-branches\\|other-branches\\)/\\)"
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"Regexp matching branches we want to ignore.")
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(defface gitmerge-skip-face
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'((t (:strike-through t)))
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"Face for skipped commits.")
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(defvar gitmerge-default-branch nil
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"Default for branch that should be merged.
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If nil, the function `gitmerge-default-branch' guesses.")
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(defconst gitmerge-buffer "*gitmerge*"
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"Working buffer for gitmerge.")
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(defconst gitmerge-output-buffer "*gitmerge output*"
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"Buffer for displaying git output.")
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(defconst gitmerge-warning-buffer "*gitmerge warnings*"
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"Buffer where gitmerge will display any warnings.")
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(defvar gitmerge-log-regexp
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"^\\([A-Z ]\\)\\s-*\\([0-9a-f]+\\) \\(.+?\\): \\(.*\\)$")
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(defvar gitmerge-mode-map
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(let ((map (make-keymap)))
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(define-key map [(l)] 'gitmerge-show-log)
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(define-key map [(d)] 'gitmerge-show-diff)
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(define-key map [(f)] 'gitmerge-show-files)
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(define-key map [(s)] 'gitmerge-toggle-skip)
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(define-key map [(m)] 'gitmerge-start-merge)
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map)
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"Keymap for gitmerge major mode.")
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(defvar gitmerge-mode-font-lock-keywords
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`((,gitmerge-log-regexp
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(1 font-lock-warning-face)
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(2 font-lock-constant-face)
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(3 font-lock-builtin-face)
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(4 font-lock-comment-face))))
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(defvar gitmerge--commits nil)
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(defvar gitmerge--from nil)
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(defun gitmerge-emacs-version (&optional branch)
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"Return the major version of Emacs, optionally in BRANCH."
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(with-temp-buffer
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(if (not branch)
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(insert-file-contents "configure.ac")
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(call-process "git" nil t nil "show" (format "%s:configure.ac" branch))
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(goto-char (point-min)))
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(re-search-forward "^AC_INIT([^,]+, \\([0-9]+\\)\\.")
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(string-to-number (match-string 1))))
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(defun gitmerge-default-branch ()
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"Default for branch that should be merged; eg \"origin/emacs-26\"."
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(or gitmerge-default-branch
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(format "origin/emacs-%s" (1- (gitmerge-emacs-version)))))
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(defun gitmerge-get-sha1 ()
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"Get SHA1 from commit at point."
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(save-excursion
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(goto-char (point-at-bol))
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(when (looking-at "^[A-Z ]\\s-*\\([a-f0-9]+\\)")
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(match-string 1))))
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(defun gitmerge-show-log ()
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"Show log of commit at point."
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(interactive)
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(save-selected-window
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(let ((commit (gitmerge-get-sha1)))
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(when commit
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(pop-to-buffer (get-buffer-create gitmerge-output-buffer))
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(fundamental-mode)
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(erase-buffer)
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(call-process "git" nil t nil "log" "-1" commit)
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(goto-char (point-min))
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(gitmerge-highlight-skip-regexp)))))
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(defun gitmerge-show-diff ()
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"Show diff of commit at point."
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(interactive)
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(save-selected-window
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(let ((commit (gitmerge-get-sha1)))
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(when commit
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(pop-to-buffer (get-buffer-create gitmerge-output-buffer))
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(erase-buffer)
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(call-process "git" nil t nil "diff-tree" "-p" commit)
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(goto-char (point-min))
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(diff-mode)))))
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(defun gitmerge-show-files ()
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"Show changed files of commit at point."
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(interactive)
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(save-selected-window
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(let ((commit (gitmerge-get-sha1)))
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(when commit
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(pop-to-buffer (get-buffer-create gitmerge-output-buffer))
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(erase-buffer)
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(fundamental-mode)
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(call-process "git" nil t nil "diff" "--name-only" (concat commit "^!"))
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(goto-char (point-min))))))
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(defun gitmerge-toggle-skip ()
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"Toggle skipping of commit at point."
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(interactive)
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(let ((commit (gitmerge-get-sha1))
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skip)
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(when commit
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(save-excursion
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(goto-char (point-at-bol))
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(when (looking-at "^\\([A-Z ]\\)\\s-*\\([a-f0-9]+\\)")
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(setq skip (string= (match-string 1) " "))
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(goto-char (match-beginning 2))
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(gitmerge-handle-skip-overlay skip)
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(dolist (ct gitmerge--commits)
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(when (string-match commit (car ct))
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(setcdr ct (when skip "M"))))
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(goto-char (point-at-bol))
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(setq buffer-read-only nil)
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(delete-char 1)
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(insert (if skip "M" " "))
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(setq buffer-read-only t))))))
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(defun gitmerge-highlight-skip-regexp ()
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"Highlight strings that match `gitmerge-skip-regexp'."
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(save-excursion
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(let ((case-fold-search t))
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(while (re-search-forward gitmerge-skip-regexp nil t)
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(put-text-property (match-beginning 0) (match-end 0)
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'face 'font-lock-warning-face)))))
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(defun gitmerge-missing (from)
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"Return the list of revisions that need to be merged from FROM.
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Will detect a default set of skipped revision by looking at
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cherry mark and search for `gitmerge-skip-regexp'. The result is
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a list with entries of the form (SHA1 . SKIP), where SKIP denotes
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if and why this commit should be skipped."
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(message "Finding missing commits...")
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(let (commits)
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;; Go through the log and remember all commits that match
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;; `gitmerge-skip-regexp' or are marked by --cherry-mark.
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(with-temp-buffer
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(call-process "git" nil t nil "log" "--cherry-mark" "--left-only"
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"--no-decorate"
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(concat from "..." (car (vc-git-branches))))
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(goto-char (point-max))
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(while (re-search-backward "^commit \\(.+\\) \\([0-9a-f]+\\).*" nil t)
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(let ((cherrymark (match-string 1))
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(commit (match-string 2)))
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(push (list commit) commits)
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(if (string= cherrymark "=")
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;; Commit was recognized as backported by cherry-mark.
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(setcdr (car commits) "C")
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(save-excursion
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(let ((case-fold-search t))
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(while (not (looking-at "^\\s-+[^ ]+"))
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(forward-line))
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(when (re-search-forward gitmerge-skip-regexp nil t)
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(setcdr (car commits) "R"))))))
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(delete-region (point) (point-max))))
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(message "Finding missing commits...done")
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(nreverse commits)))
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(defun gitmerge-setup-log-buffer (commits from)
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"Create the buffer for choosing commits."
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(with-current-buffer (get-buffer-create gitmerge-buffer)
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(erase-buffer)
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(call-process "git" nil t nil "log" "--left-only"
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"--pretty=format:%h %<(20,trunc) %an: %<(100,trunc) %s"
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(concat from "..." (car (vc-git-branches))))
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(goto-char (point-min))
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(while (looking-at "^\\([a-f0-9]+\\)")
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(let ((skipreason (gitmerge-skip-commit-p (match-string 1) commits)))
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(if (null skipreason)
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(insert " ")
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(insert skipreason " ")
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(gitmerge-handle-skip-overlay t)))
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(forward-line))
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(current-buffer)))
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(defun gitmerge-handle-skip-overlay (skip)
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"Create or delete overlay on SHA1, depending on SKIP."
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(when (looking-at "[0-9a-f]+")
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(if skip
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(let ((ov (make-overlay (point)
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(match-end 0))))
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(overlay-put ov 'face 'gitmerge-skip-face))
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(remove-overlays (point) (match-end 0)
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'face 'gitmerge-skip-face))))
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(defun gitmerge-skip-commit-p (commit skips)
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"Tell whether COMMIT should be skipped.
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COMMIT is an (possibly abbreviated) SHA1. SKIPS is list of
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cons'es with commits that should be skipped and the reason.
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Return value is string which denotes reason, or nil if commit
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should not be skipped."
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(let (found skip)
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(while (and (setq skip (pop skips))
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(not found))
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(when (string-match commit (car skip))
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(setq found (cdr skip))))
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found))
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(defvar change-log-start-entry-re) ; in add-log, which defines change-log-mode
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(declare-function add-log-iso8601-time-string "add-log" ())
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(defun gitmerge-resolve (file)
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"Try to resolve conflicts in FILE with smerge.
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Returns non-nil if conflicts remain."
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(unless (file-exists-p file) (error "Gitmerge-resolve: Can't find %s" file))
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(with-demoted-errors
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(let ((exists (find-buffer-visiting file)))
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(with-current-buffer (let ((enable-local-variables :safe)
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(enable-local-eval nil))
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(find-file-noselect file))
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(if (buffer-modified-p)
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(user-error "Unsaved changes in %s" (current-buffer)))
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(save-excursion
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(cond
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((derived-mode-p 'change-log-mode)
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;; Fix up dates before resolving the conflicts.
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(goto-char (point-min))
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(let ((diff-refine nil))
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(while (re-search-forward smerge-begin-re nil t)
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(smerge-match-conflict)
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(smerge-ensure-match 3)
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(let ((start1 (match-beginning 1))
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(end1 (match-end 1))
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(start3 (match-beginning 3))
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(end3 (copy-marker (match-end 3) t)))
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(goto-char start3)
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(while (re-search-forward change-log-start-entry-re end3 t)
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(let* ((str (match-string 0))
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(newstr (save-match-data
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(concat (add-log-iso8601-time-string)
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(when (string-match " *\\'" str)
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(match-string 0 str))))))
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(replace-match newstr t t)))
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;; change-log-resolve-conflict prefers to put match-1's
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;; elements first (for equal dates), whereas we want to put
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;; match-3's first.
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(let ((match3 (buffer-substring start3 end3))
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(match1 (buffer-substring start1 end1)))
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(delete-region start3 end3)
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(goto-char start3)
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(insert match1)
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(delete-region start1 end1)
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(goto-char start1)
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(insert match3)))))
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;; (pop-to-buffer (current-buffer)) (debug 'before-resolve)
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))
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;; Try to resolve the conflicts.
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(let (temp)
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(cond
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;; FIXME when merging release branch to master, we still
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;; need to detect and handle the case where NEWS was modified
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;; without a conflict. We should abort if NEWS gets changed.
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((and (equal file "etc/NEWS")
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(ignore-errors
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(setq temp
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(format "NEWS.%s"
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(gitmerge-emacs-version gitmerge--from))))
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(file-exists-p temp)
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(or noninteractive
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(y-or-n-p "Try to fix NEWS conflict? ")))
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(let ((relfile (file-name-nondirectory file))
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(patchfile (concat temp "-gitmerge.patch")))
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(call-process "git" nil `(:file ,patchfile) nil "diff"
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(format ":1:%s" file)
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(format ":3:%s" file))
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(if (eq 0 (call-process "patch" patchfile nil nil temp))
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(progn
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;; We intentionally use a non-temporary name for this
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;; file, and only delete it if applied successfully.
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(delete-file patchfile)
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(call-process "git" nil t nil "add" "--" temp)
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(call-process "git" nil t nil "reset" "--" relfile)
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(call-process "git" nil t nil "checkout" "--" relfile)
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(revert-buffer nil 'noconfirm))
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;; The conflict markers remain so we return non-nil.
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(message "Failed to fix NEWS conflict"))))
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;; Generated files.
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((member file '("lisp/ldefs-boot.el"))
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;; We are in the file's buffer, so names are relative.
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(call-process "git" nil t nil "reset" "--"
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(file-name-nondirectory file))
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(call-process "git" nil t nil "checkout" "--"
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(file-name-nondirectory file))
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(revert-buffer nil 'noconfirm))
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(t
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(goto-char (point-max))
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(while (re-search-backward smerge-begin-re nil t)
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(save-excursion
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(ignore-errors
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(smerge-match-conflict)
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(smerge-resolve))))
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;; (when (derived-mode-p 'change-log-mode)
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;; (pop-to-buffer (current-buffer)) (debug 'after-resolve))
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(save-buffer))))
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(goto-char (point-min))
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(prog1 (re-search-forward smerge-begin-re nil t)
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(unless exists (kill-buffer))))))))
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(defun gitmerge-commit-message (beg end skip branch)
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"Create commit message for merging BEG to END from BRANCH.
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SKIP denotes whether those commits are actually skipped. If END
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is nil, only the single commit BEG is merged."
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(with-temp-buffer
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;; We do not insert "; " for non-skipped messages,
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;; because the date of those entries is helpful in figuring out
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;; when things got merged, since git does not track that.
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(insert (if skip "; " "")
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"Merge from " branch "\n\n"
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(if skip
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(concat "The following commit"
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(if end "s were " " was ")
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"skipped:\n\n")
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""))
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(apply 'call-process "git" nil t nil "log" "--oneline"
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(if end (list (concat beg "~.." end))
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`("-1" ,beg)))
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(insert "\n")
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;; Truncate to 72 chars so that the resulting ChangeLog line fits in 80.
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(goto-char (point-min))
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(while (re-search-forward "^\\(.\\{69\\}\\).\\{4,\\}" nil t)
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(replace-match "\\1..."))
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(buffer-string)))
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(defun gitmerge-apply (missing from)
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"Merge commits in MISSING from branch FROM.
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MISSING must be a list of SHA1 strings."
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(with-current-buffer (get-buffer-create gitmerge-output-buffer)
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(erase-buffer)
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(let* ((skip (cdar missing))
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(beg (car (pop missing)))
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end commitmessage)
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;; Determine last revision with same boolean skip status.
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(while (and missing
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(eq (null (cdar missing))
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(null skip)))
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(setq end (car (pop missing))))
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(setq commitmessage
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(gitmerge-commit-message beg end skip from))
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(message "%s %s%s"
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(if skip "Skipping" "Merging")
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(substring beg 0 6)
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(if end (concat ".." (substring end 0 6)) ""))
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(unless end
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(setq end beg))
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(unless (zerop
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(apply 'call-process "git" nil t nil "merge" "--no-ff"
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(append (when skip '("-s" "ours"))
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`("-m" ,commitmessage ,end))))
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(gitmerge-write-missing missing from)
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(gitmerge-resolve-unmerged)))
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missing))
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(defun gitmerge-resolve-unmerged ()
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"Resolve all files that are unmerged.
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Throw an user-error if we cannot resolve automatically."
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(with-current-buffer (get-buffer-create gitmerge-output-buffer)
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(erase-buffer)
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(let (files conflicted)
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;; List unmerged files
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(if (not (zerop
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(call-process "git" nil t nil
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"diff" "--name-only" "--diff-filter=U")))
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(error "Error listing unmerged files. Resolve manually.")
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(goto-char (point-min))
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(while (not (eobp))
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(push (buffer-substring (point) (line-end-position)) files)
|
||
(forward-line))
|
||
(dolist (file files)
|
||
(if (gitmerge-resolve file)
|
||
;; File still has conflicts
|
||
(setq conflicted t)
|
||
;; Mark as resolved
|
||
(call-process "git" nil t nil "add" file)))
|
||
(if (not conflicted)
|
||
(and files (not (gitmerge-commit))
|
||
(error "Error committing resolution - fix it manually"))
|
||
(with-current-buffer (get-buffer-create gitmerge-warning-buffer)
|
||
(erase-buffer)
|
||
(insert "For the following files, conflicts could\n"
|
||
"not be resolved automatically:\n\n")
|
||
(let ((conflicts
|
||
(with-temp-buffer
|
||
(call-process "git" nil t nil
|
||
"diff" "--name-only" "--diff-filter=U")
|
||
(buffer-string))))
|
||
(insert conflicts)
|
||
(if noninteractive (message "Conflicts in:\n%s" conflicts)))
|
||
(insert "\nResolve the conflicts manually, then run gitmerge again."
|
||
"\nNote:\n - You don't have to add resolved files or "
|
||
"commit the merge yourself (but you can)."
|
||
"\n - You can safely close this Emacs session and do this "
|
||
"in a new one."
|
||
"\n - When running gitmerge again, remember that you must "
|
||
"do that from within the Emacs repo.\n")
|
||
(pop-to-buffer (current-buffer)))
|
||
(user-error "Resolve the conflicts manually"))))))
|
||
|
||
(defun gitmerge-repo-clean ()
|
||
"Return non-nil if repository is clean."
|
||
(with-temp-buffer
|
||
(call-process "git" nil t nil
|
||
"diff" "--staged" "--name-only")
|
||
(call-process "git" nil t nil
|
||
"diff" "--name-only")
|
||
(zerop (buffer-size))))
|
||
|
||
(defun gitmerge-commit ()
|
||
"Commit, and return non-nil if it succeeds."
|
||
(with-current-buffer (get-buffer-create gitmerge-output-buffer)
|
||
(erase-buffer)
|
||
(eq 0 (call-process "git" nil t nil "commit" "--no-edit"))))
|
||
|
||
(defun gitmerge-maybe-resume ()
|
||
"Check if we have to resume a merge.
|
||
If so, add no longer conflicted files and commit."
|
||
(let ((mergehead
|
||
(file-exists-p
|
||
(expand-file-name
|
||
"MERGE_HEAD"
|
||
(car (process-lines
|
||
"git" "rev-parse" "--no-flags" "--git-dir")))))
|
||
(statusexist (file-exists-p gitmerge-status-file)))
|
||
(when (and mergehead (not statusexist))
|
||
(user-error "Unfinished merge, but no record of a previous gitmerge run"))
|
||
(when (and (not mergehead)
|
||
(not (gitmerge-repo-clean)))
|
||
(user-error "Repository is not clean"))
|
||
(when statusexist
|
||
(if (or noninteractive (not (y-or-n-p "Resume merge? ")))
|
||
(progn
|
||
(delete-file gitmerge-status-file)
|
||
;; No resume.
|
||
nil)
|
||
(message "OK, resuming...")
|
||
(gitmerge-resolve-unmerged)
|
||
;; Commit the merge.
|
||
(when mergehead
|
||
(or (gitmerge-commit)
|
||
(error "Git error during merge - fix it manually")))
|
||
;; Successfully resumed.
|
||
t))))
|
||
|
||
(defun gitmerge-get-all-branches ()
|
||
"Return list of all branches, including remotes."
|
||
(with-temp-buffer
|
||
(unless (zerop (call-process "git" nil t nil
|
||
"branch" "-a"))
|
||
(error "Git error listing remote branches"))
|
||
(goto-char (point-min))
|
||
(let (branches branch)
|
||
(while (not (eobp))
|
||
(when (looking-at "^[^\\*]\\s-*\\(?:remotes/\\)?\\(.+\\)$")
|
||
(setq branch (match-string 1))
|
||
(unless (string-match gitmerge-ignore-branches-regexp branch)
|
||
(push branch branches)))
|
||
(forward-line))
|
||
(nreverse branches))))
|
||
|
||
(defun gitmerge-write-missing (missing from)
|
||
"Write list of commits MISSING into `gitmerge-status-file'.
|
||
Branch FROM will be prepended to the list."
|
||
(with-current-buffer
|
||
(find-file-noselect gitmerge-status-file)
|
||
(erase-buffer)
|
||
(insert
|
||
(prin1-to-string (append (list from) missing))
|
||
"\n")
|
||
(save-buffer)
|
||
(kill-buffer)))
|
||
|
||
(defun gitmerge-read-missing ()
|
||
"Read list of missing commits from `gitmerge-status-file'."
|
||
(with-current-buffer
|
||
(find-file-noselect gitmerge-status-file)
|
||
(unless (zerop (buffer-size))
|
||
(prog1 (read (buffer-string))
|
||
(kill-buffer)))))
|
||
|
||
(define-derived-mode gitmerge-mode special-mode "gitmerge"
|
||
"Major mode for Emacs branch merging."
|
||
(set-syntax-table text-mode-syntax-table)
|
||
(setq buffer-read-only t)
|
||
(setq-local truncate-lines t)
|
||
(setq-local font-lock-defaults '(gitmerge-mode-font-lock-keywords)))
|
||
|
||
(defun gitmerge (from)
|
||
"Merge from branch FROM into `default-directory'."
|
||
(interactive
|
||
(if (not (vc-git-root default-directory))
|
||
(user-error "Not in a git tree")
|
||
(let ((default-directory (vc-git-root default-directory)))
|
||
(list
|
||
(if (gitmerge-maybe-resume)
|
||
'resume
|
||
(if noninteractive
|
||
(or (pop command-line-args-left)
|
||
(gitmerge-default-branch))
|
||
(completing-read "Merge branch: "
|
||
(gitmerge-get-all-branches)
|
||
nil t (gitmerge-default-branch))))))))
|
||
(let ((default-directory (vc-git-root default-directory)))
|
||
(if (eq from 'resume)
|
||
(progn
|
||
(setq gitmerge--commits (gitmerge-read-missing))
|
||
(setq gitmerge--from (pop gitmerge--commits))
|
||
;; Directly continue with the merge.
|
||
(gitmerge-start-merge))
|
||
(setq gitmerge--commits (gitmerge-missing from))
|
||
(setq gitmerge--from from)
|
||
(when (null gitmerge--commits)
|
||
(user-error "Nothing to merge"))
|
||
(and noninteractive
|
||
gitmerge-minimum-missing
|
||
(< (length gitmerge--commits) gitmerge-minimum-missing)
|
||
(user-error "Number of missing commits (%s) is less than %s"
|
||
(length gitmerge--commits)
|
||
gitmerge-minimum-missing))
|
||
(with-current-buffer
|
||
(gitmerge-setup-log-buffer gitmerge--commits gitmerge--from)
|
||
(goto-char (point-min))
|
||
(insert (propertize "Commands: " 'font-lock-face 'bold)
|
||
"(s) Toggle skip, (l) Show log, (d) Show diff, "
|
||
"(f) Show files, (m) Start merge\n"
|
||
(propertize "Flags: " 'font-lock-face 'bold)
|
||
"(C) Detected backport (cherry-mark), (R) Log matches "
|
||
"regexp, (M) Manually picked\n\n")
|
||
(gitmerge-mode)
|
||
(pop-to-buffer (current-buffer))
|
||
(if noninteractive (gitmerge-start-merge))))))
|
||
|
||
(defun gitmerge-start-merge ()
|
||
(interactive)
|
||
(when (not (vc-git-root default-directory))
|
||
(user-error "Not in a git tree"))
|
||
(let ((default-directory (vc-git-root default-directory)))
|
||
(while gitmerge--commits
|
||
(setq gitmerge--commits
|
||
(gitmerge-apply gitmerge--commits gitmerge--from)))
|
||
(when (file-exists-p gitmerge-status-file)
|
||
(delete-file gitmerge-status-file))
|
||
(message "Merging from %s...done" gitmerge--from)))
|
||
|
||
(provide 'gitmerge)
|
||
|
||
;;; gitmerge.el ends here
|