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;;; magit-merge.el --- merge functionality -*- lexical-binding: t -*-
;; Copyright (C) 2010-2018 The Magit Project Contributors
;;
;; You should have received a copy of the AUTHORS.md file which
;; lists all contributors. If not, see http://magit.vc/authors.
;; Author: Jonas Bernoulli <jonas@bernoul.li>
;; Maintainer: Jonas Bernoulli <jonas@bernoul.li>
;; Magit is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; Magit is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
;; License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with Magit. If not, see http://www.gnu.org/licenses.
;;; Commentary:
;; This library implements merge commands.
;;; Code:
(require 'magit)
;;; Commands
;;;###autoload (autoload 'magit-merge-popup "magit" nil t)
(magit-define-popup magit-merge-popup
"Popup console for merge commands."
:man-page "git-merge"
:switches '((?f "Fast-forward only" "--ff-only")
(?n "No fast-forward" "--no-ff"))
:options '((?s "Strategy" "--strategy="))
:actions '((?m "Merge" magit-merge)
(?p "Preview merge" magit-merge-preview)
(?e "Merge and edit message" magit-merge-editmsg) nil
(?n "Merge but don't commit" magit-merge-nocommit)
(?s "Squash merge" magit-merge-squash)
(?a "Absorb" magit-merge-absorb)
(?i "Merge into" magit-merge-into))
:sequence-actions '((?m "Commit merge" magit-commit)
(?a "Abort merge" magit-merge-abort))
:sequence-predicate 'magit-merge-in-progress-p
:default-action 'magit-merge
:max-action-columns 2)
;;;###autoload
(defun magit-merge (rev &optional args nocommit)
"Merge commit REV into the current branch; using default message.
Unless there are conflicts or a prefix argument is used create a
merge commit using a generic commit message and without letting
the user inspect the result. With a prefix argument pretend the
merge failed to give the user the opportunity to inspect the
merge.
\(git merge --no-edit|--no-commit [ARGS] REV)"
(interactive (list (magit-read-other-branch-or-commit "Merge")
(magit-merge-arguments)
current-prefix-arg))
(magit-merge-assert)
(magit-run-git-async "merge" (if nocommit "--no-commit" "--no-edit") args rev))
;;;###autoload
(defun magit-merge-editmsg (rev &optional args)
"Merge commit REV into the current branch; and edit message.
Perform the merge and prepare a commit message but let the user
edit it.
\n(git merge --edit --no-ff [ARGS] REV)"
(interactive (list (magit-read-other-branch-or-commit "Merge")
(magit-merge-arguments)))
(magit-merge-assert)
(cl-pushnew "--no-ff" args :test #'equal)
(apply #'magit-run-git-with-editor "merge" "--edit"
(append args (list rev))))
;;;###autoload
(defun magit-merge-nocommit (rev &optional args)
"Merge commit REV into the current branch; pretending it failed.
Pretend the merge failed to give the user the opportunity to
inspect the merge and change the commit message.
\n(git merge --no-commit --no-ff [ARGS] REV)"
(interactive (list (magit-read-other-branch-or-commit "Merge")
(magit-merge-arguments)))
(magit-merge-assert)
(cl-pushnew "--no-ff" args :test #'equal)
(magit-run-git-async "merge" "--no-commit" args rev))
;;;###autoload
(defun magit-merge-into (branch &optional args)
"Merge the current branch into BRANCH and remove the former.
Before merging, force push the source branch to its push-remote,
provided the respective remote branch already exists, ensuring
that the respective pull-request (if any) won't get stuck on some
obsolete version of the commits that are being merged. Finally
if `magit-branch-pull-request' was used to create the merged
branch, then also remove the respective remote branch."
(interactive (list (magit-read-other-local-branch
(format "Merge `%s' into" (magit-get-current-branch))
nil
(let ((branch (cdr (magit-split-branch-name
(magit-get-upstream-branch)))))
(and (magit-branch-p branch) branch)))
(magit-merge-arguments)))
(let ((current (magit-get-current-branch)))
(when (zerop (magit-call-git "checkout" branch))
(magit--merge-absort current args))))
;;;###autoload
(defun magit-merge-absorb (branch &optional args)
"Merge BRANCH into the current branch and remove the former.
Before merging, force push the source branch to its push-remote,
provided the respective remote branch already exists, ensuring
that the respective pull-request (if any) won't get stuck on some
obsolete version of the commits that are being merged. Finally
if `magit-branch-pull-request' was used to create the merged
branch, then also remove the respective remote branch."
(interactive (list (magit-read-other-local-branch "Absorb branch")
(magit-merge-arguments)))
(magit--merge-absort branch args))
(defun magit--merge-absort (branch args)
(when (equal branch "master")
(unless (yes-or-no-p
"Do you really wanto to merge `master' into another branch? ")
(user-error "Abort")))
(if-let ((target (magit-get-push-branch branch t)))
(progn
(magit-git-push branch target (list "--force-with-lease"))
(set-process-sentinel
magit-this-process
(lambda (process event)
(when (memq (process-status process) '(exit signal))
(if (not (zerop (process-exit-status process)))
(magit-process-sentinel process event)
(process-put process 'inhibit-refresh t)
(magit-process-sentinel process event)
(magit--merge-absort-1 branch args))))))
(magit--merge-absort-1 branch args)))
(defun magit--merge-absort-1 (branch args)
(magit-run-git-async "merge" args "--no-edit" branch)
(set-process-sentinel
magit-this-process
(lambda (process event)
(when (memq (process-status process) '(exit signal))
(if (> (process-exit-status process) 0)
(magit-process-sentinel process event)
(process-put process 'inhibit-refresh t)
(magit-process-sentinel process event)
(magit-branch-maybe-delete-pr-remote branch)
(magit-branch-unset-pushRemote branch)
(magit-run-git "branch" "-D" branch))))))
;;;###autoload
(defun magit-merge-squash (rev)
"Squash commit REV into the current branch; don't create a commit.
\n(git merge --squash REV)"
(interactive (list (magit-read-other-branch-or-commit "Squash")))
(magit-merge-assert)
(magit-run-git-async "merge" "--squash" rev))
;;;###autoload
(defun magit-merge-preview (rev)
"Preview result of merging REV into the current branch."
(interactive (list (magit-read-other-branch-or-commit "Preview merge")))
(magit-mode-setup #'magit-merge-preview-mode rev))
(define-derived-mode magit-merge-preview-mode magit-diff-mode "Magit Merge"
"Mode for previewing a merge."
:group 'magit-diff
(hack-dir-local-variables-non-file-buffer))
(defun magit-merge-preview-refresh-buffer (rev)
(let* ((branch (magit-get-current-branch))
(head (or branch (magit-rev-verify "HEAD"))))
(magit-set-header-line-format (format "Preview merge of %s into %s"
rev
(or branch "HEAD")))
(magit-insert-section (diffbuf)
(magit-git-wash #'magit-diff-wash-diffs
"merge-tree" (magit-git-string "merge-base" head rev) head rev))))
;;;###autoload
(defun magit-merge-abort ()
"Abort the current merge operation.
\n(git merge --abort)"
(interactive)
(unless (file-exists-p (magit-git-dir "MERGE_HEAD"))
(user-error "No merge in progress"))
(magit-confirm 'abort-merge)
(magit-run-git-async "merge" "--abort"))
(defun magit-checkout-stage (file arg)
"During a conflict checkout and stage side, or restore conflict."
(interactive
(let ((file (magit-completing-read "Checkout file"
(magit-tracked-files) nil nil nil
'magit-read-file-hist
(magit-current-file))))
(cond ((member file (magit-unmerged-files))
(list file (magit-checkout-read-stage file)))
((yes-or-no-p (format "Restore conflicts in %s? " file))
(list file "--merge"))
(t
(user-error "Quit")))))
(pcase (cons arg (cddr (car (magit-file-status file))))
((or `("--ours" ?D ,_)
`("--theirs" ,_ ?D))
(magit-run-git "rm" "--" file))
(_ (if (equal arg "--merge")
;; This fails if the file was deleted on one
;; side. And we cannot do anything about it.
(magit-run-git "checkout" "--merge" "--" file)
(magit-call-git "checkout" arg "--" file)
(magit-run-git "add" "-u" "--" file)))))
;;; Utilities
(defun magit-merge-in-progress-p ()
(file-exists-p (magit-git-dir "MERGE_HEAD")))
(defun magit--merge-range (&optional head)
(unless head
(setq head (magit-get-shortname
(car (magit-file-lines (magit-git-dir "MERGE_HEAD"))))))
(and head
(concat (magit-git-string "merge-base" "--octopus" "HEAD" head)
".." head)))
(defun magit-merge-assert ()
(or (not (magit-anything-modified-p t))
(magit-confirm 'merge-dirty
"Merging with dirty worktree is risky. Continue")))
(defun magit-checkout-read-stage (file)
(magit-read-char-case (format "For %s checkout: " file) t
(?o "[o]ur stage" "--ours")
(?t "[t]heir stage" "--theirs")
(?c "[c]onflict" "--merge")))
;;; Sections
(defvar magit-unmerged-section-map
(let ((map (make-sparse-keymap)))
(define-key map [remap magit-visit-thing] 'magit-diff-dwim)
map)
"Keymap for `unmerged' sections.")
(defun magit-insert-merge-log ()
"Insert section for the on-going merge.
Display the heads that are being merged.
If no merge is in progress, do nothing."
(when (magit-merge-in-progress-p)
(let* ((heads (mapcar #'magit-get-shortname
(magit-file-lines (magit-git-dir "MERGE_HEAD"))))
(range (magit--merge-range (car heads))))
(magit-insert-section (unmerged range)
(magit-insert-heading
(format "Merging %s:" (mapconcat #'identity heads ", ")))
(magit-insert-log
range
(let ((args magit-log-section-arguments))
(unless (member "--decorate=full" magit-log-section-arguments)
(push "--decorate=full" args))
args))))))
(provide 'magit-merge)
;;; magit-merge.el ends here
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