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+;;; git-rebase.el --- Edit Git rebase files -*- lexical-binding:t -*-
+
+;; Copyright (C) 2008-2022 The Magit Project Contributors
+
+;; Author: Phil Jackson <phil@shellarchive.co.uk>
+;; Maintainer: Jonas Bernoulli <jonas@bernoul.li>
+
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;; 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 of the License, 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This package assists the user in editing the list of commits to be
+;; rewritten during an interactive rebase.
+
+;; When the user initiates an interactive rebase, e.g. using "r e" in
+;; a Magit buffer or on the command line using "git rebase -i REV",
+;; Git invokes the `$GIT_SEQUENCE_EDITOR' (or if that is undefined
+;; `$GIT_EDITOR' or even `$EDITOR') letting the user rearrange, drop,
+;; reword, edit, and squash commits.
+
+;; This package provides the major-mode `git-rebase-mode' which makes
+;; doing so much more fun, by making the buffer more colorful and
+;; providing the following commands:
+;;
+;; C-c C-c Tell Git to make it happen.
+;; C-c C-k Tell Git that you changed your mind, i.e. abort.
+;;
+;; p Move point to previous line.
+;; n Move point to next line.
+;;
+;; M-p Move the commit at point up.
+;; M-n Move the commit at point down.
+;;
+;; k Drop the commit at point.
+;; c Don't drop the commit at point.
+;; r Change the message of the commit at point.
+;; e Edit the commit at point.
+;; s Squash the commit at point, into the one above.
+;; f Like "s" but don't also edit the commit message.
+;; b Break for editing at this point in the sequence.
+;; x Add a script to be run with the commit at point
+;; being checked out.
+;; z Add noop action at point.
+;;
+;; SPC Show the commit at point in another buffer.
+;; RET Show the commit at point in another buffer and
+;; select its window.
+;; C-/ Undo last change.
+;;
+;; Commands for --rebase-merges:
+;; l Associate label with current HEAD in sequence.
+;; MM Merge specified revisions into HEAD.
+;; Mt Toggle whether the merge will invoke an editor
+;; before committing.
+;; t Reset HEAD to the specified label.
+
+;; You should probably also read the `git-rebase' manpage.
+
+;;; Code:
+
+(require 'magit)
+
+(require 'easymenu)
+(require 'server)
+(require 'with-editor)
+
+(defvar recentf-exclude)
+
+;;; Options
+;;;; Variables
+
+(defgroup git-rebase nil
+ "Edit Git rebase sequences."
+ :link '(info-link "(magit)Editing Rebase Sequences")
+ :group 'tools)
+
+(defcustom git-rebase-auto-advance t
+ "Whether to move to next line after changing a line."
+ :group 'git-rebase
+ :type 'boolean)
+
+(defcustom git-rebase-show-instructions t
+ "Whether to show usage instructions inside the rebase buffer."
+ :group 'git-rebase
+ :type 'boolean)
+
+(defcustom git-rebase-confirm-cancel t
+ "Whether confirmation is required to cancel."
+ :group 'git-rebase
+ :type 'boolean)
+
+;;;; Faces
+
+(defgroup git-rebase-faces nil
+ "Faces used by Git-Rebase mode."
+ :group 'faces
+ :group 'git-rebase)
+
+(defface git-rebase-hash '((t :inherit magit-hash))
+ "Face for commit hashes."
+ :group 'git-rebase-faces)
+
+(defface git-rebase-label '((t :inherit magit-refname))
+ "Face for labels in label, merge, and reset lines."
+ :group 'git-rebase-faces)
+
+(defface git-rebase-description '((t nil))
+ "Face for commit descriptions."
+ :group 'git-rebase-faces)
+
+(defface git-rebase-action
+ '((t :inherit font-lock-keyword-face))
+ "Face for action keywords."
+ :group 'git-rebase-faces)
+
+(defface git-rebase-killed-action
+ '((t :inherit font-lock-comment-face :strike-through t))
+ "Face for commented commit action lines."
+ :group 'git-rebase-faces)
+
+(defface git-rebase-comment-hash
+ '((t :inherit git-rebase-hash :weight bold))
+ "Face for commit hashes in commit message comments."
+ :group 'git-rebase-faces)
+
+(defface git-rebase-comment-heading
+ '((t :inherit font-lock-keyword-face))
+ "Face for headings in rebase message comments."
+ :group 'git-rebase-faces)
+
+;;; Keymaps
+
+(defvar git-rebase-mode-map
+ (let ((map (make-sparse-keymap)))
+ (set-keymap-parent map special-mode-map)
+ (define-key map (kbd "C-m") #'git-rebase-show-commit)
+ (define-key map (kbd "p") #'git-rebase-backward-line)
+ (define-key map (kbd "n") #'forward-line)
+ (define-key map (kbd "M-p") #'git-rebase-move-line-up)
+ (define-key map (kbd "M-n") #'git-rebase-move-line-down)
+ (define-key map (kbd "c") #'git-rebase-pick)
+ (define-key map (kbd "k") #'git-rebase-kill-line)
+ (define-key map (kbd "C-k") #'git-rebase-kill-line)
+ (define-key map (kbd "b") #'git-rebase-break)
+ (define-key map (kbd "e") #'git-rebase-edit)
+ (define-key map (kbd "l") #'git-rebase-label)
+ (define-key map (kbd "MM") #'git-rebase-merge)
+ (define-key map (kbd "Mt") #'git-rebase-merge-toggle-editmsg)
+ (define-key map (kbd "m") #'git-rebase-edit)
+ (define-key map (kbd "f") #'git-rebase-fixup)
+ (define-key map (kbd "q") #'undefined)
+ (define-key map (kbd "r") #'git-rebase-reword)
+ (define-key map (kbd "w") #'git-rebase-reword)
+ (define-key map (kbd "s") #'git-rebase-squash)
+ (define-key map (kbd "t") #'git-rebase-reset)
+ (define-key map (kbd "x") #'git-rebase-exec)
+ (define-key map (kbd "y") #'git-rebase-insert)
+ (define-key map (kbd "z") #'git-rebase-noop)
+ (define-key map (kbd "SPC") #'git-rebase-show-or-scroll-up)
+ (define-key map (kbd "DEL") #'git-rebase-show-or-scroll-down)
+ (define-key map (kbd "C-x C-t") #'git-rebase-move-line-up)
+ (define-key map [M-up] #'git-rebase-move-line-up)
+ (define-key map [M-down] #'git-rebase-move-line-down)
+ (define-key map [remap undo] #'git-rebase-undo)
+ map)
+ "Keymap for Git-Rebase mode.")
+
+(put 'git-rebase-reword :advertised-binding (kbd "r"))
+(put 'git-rebase-move-line-up :advertised-binding (kbd "M-p"))
+(put 'git-rebase-kill-line :advertised-binding (kbd "k"))
+
+(easy-menu-define git-rebase-mode-menu git-rebase-mode-map
+ "Git-Rebase mode menu"
+ '("Rebase"
+ ["Pick" git-rebase-pick t]
+ ["Reword" git-rebase-reword t]
+ ["Edit" git-rebase-edit t]
+ ["Squash" git-rebase-squash t]
+ ["Fixup" git-rebase-fixup t]
+ ["Kill" git-rebase-kill-line t]
+ ["Noop" git-rebase-noop t]
+ ["Execute" git-rebase-exec t]
+ ["Move Down" git-rebase-move-line-down t]
+ ["Move Up" git-rebase-move-line-up t]
+ "---"
+ ["Cancel" with-editor-cancel t]
+ ["Finish" with-editor-finish t]))
+
+(defvar git-rebase-command-descriptions
+ '((with-editor-finish . "tell Git to make it happen")
+ (with-editor-cancel . "tell Git that you changed your mind, i.e. abort")
+ (git-rebase-backward-line . "move point to previous line")
+ (forward-line . "move point to next line")
+ (git-rebase-move-line-up . "move the commit at point up")
+ (git-rebase-move-line-down . "move the commit at point down")
+ (git-rebase-show-or-scroll-up . "show the commit at point in another buffer")
+ (git-rebase-show-commit
+ . "show the commit at point in another buffer and select its window")
+ (undo . "undo last change")
+ (git-rebase-kill-line . "drop the commit at point")
+ (git-rebase-insert . "insert a line for an arbitrary commit")
+ (git-rebase-noop . "add noop action at point")))
+
+;;; Commands
+
+(defun git-rebase-pick ()
+ "Use commit on current line.
+If the region is active, act on all lines touched by the region."
+ (interactive)
+ (git-rebase-set-action "pick"))
+
+(defun git-rebase-reword ()
+ "Edit message of commit on current line.
+If the region is active, act on all lines touched by the region."
+ (interactive)
+ (git-rebase-set-action "reword"))
+
+(defun git-rebase-edit ()
+ "Stop at the commit on the current line.
+If the region is active, act on all lines touched by the region."
+ (interactive)
+ (git-rebase-set-action "edit"))
+
+(defun git-rebase-squash ()
+ "Meld commit on current line into previous commit, edit message.
+If the region is active, act on all lines touched by the region."
+ (interactive)
+ (git-rebase-set-action "squash"))
+
+(defun git-rebase-fixup ()
+ "Meld commit on current line into previous commit, discard its message.
+If the region is active, act on all lines touched by the region."
+ (interactive)
+ (git-rebase-set-action "fixup"))
+
+(defvar-local git-rebase-comment-re nil)
+
+(defvar git-rebase-short-options
+ '((?b . "break")
+ (?e . "edit")
+ (?f . "fixup")
+ (?l . "label")
+ (?m . "merge")
+ (?p . "pick")
+ (?r . "reword")
+ (?s . "squash")
+ (?t . "reset")
+ (?x . "exec"))
+ "Alist mapping single key of an action to the full name.")
+
+(defclass git-rebase-action ()
+ (;; action-type: commit, exec, bare, label, merge
+ (action-type :initarg :action-type :initform nil)
+ ;; Examples for each action type:
+ ;; | action | action options | target | trailer |
+ ;; |--------+----------------+---------+---------|
+ ;; | pick | | hash | subject |
+ ;; | exec | | command | |
+ ;; | noop | | | |
+ ;; | reset | | name | subject |
+ ;; | merge | -C hash | name | subject |
+ (action :initarg :action :initform nil)
+ (action-options :initarg :action-options :initform nil)
+ (target :initarg :target :initform nil)
+ (trailer :initarg :trailer :initform nil)
+ (comment-p :initarg :comment-p :initform nil)))
+
+(defvar git-rebase-line-regexps
+ `((commit . ,(concat
+ (regexp-opt '("e" "edit"
+ "f" "fixup"
+ "p" "pick"
+ "r" "reword"
+ "s" "squash")
+ "\\(?1:")
+ " \\(?3:[^ \n]+\\) ?\\(?4:.*\\)"))
+ (exec . "\\(?1:x\\|exec\\) \\(?3:.*\\)")
+ (bare . ,(concat (regexp-opt '("b" "break" "noop") "\\(?1:")
+ " *$"))
+ (label . ,(concat (regexp-opt '("l" "label"
+ "t" "reset")
+ "\\(?1:")
+ " \\(?3:[^ \n]+\\) ?\\(?4:.*\\)"))
+ (merge . ,(concat "\\(?1:m\\|merge\\) "
+ "\\(?:\\(?2:-[cC] [^ \n]+\\) \\)?"
+ "\\(?3:[^ \n]+\\)"
+ " ?\\(?4:.*\\)"))))
+
+;;;###autoload
+(defun git-rebase-current-line ()
+ "Parse current line into a `git-rebase-action' instance.
+If the current line isn't recognized as a rebase line, an
+instance with all nil values is returned."
+ (save-excursion
+ (goto-char (line-beginning-position))
+ (if-let ((re-start (concat "^\\(?5:" (regexp-quote comment-start)
+ "\\)? *"))
+ (type (seq-some (lambda (arg)
+ (let ((case-fold-search nil))
+ (and (looking-at (concat re-start (cdr arg)))
+ (car arg))))
+ git-rebase-line-regexps)))
+ (git-rebase-action
+ :action-type type
+ :action (and-let* ((action (match-string-no-properties 1)))
+ (or (cdr (assoc action git-rebase-short-options))
+ action))
+ :action-options (match-string-no-properties 2)
+ :target (match-string-no-properties 3)
+ :trailer (match-string-no-properties 4)
+ :comment-p (and (match-string 5) t))
+ ;; Use default empty class rather than nil to ease handling.
+ (git-rebase-action))))
+
+(defun git-rebase-set-action (action)
+ "Set action of commit line to ACTION.
+If the region is active, operate on all lines that it touches.
+Otherwise, operate on the current line. As a special case, an
+ACTION of nil comments the rebase line, regardless of its action
+type."
+ (pcase (git-rebase-region-bounds t)
+ (`(,beg ,end)
+ (let ((end-marker (copy-marker end))
+ (pt-below-p (and mark-active (< (mark) (point)))))
+ (set-marker-insertion-type end-marker t)
+ (goto-char beg)
+ (while (< (point) end-marker)
+ (with-slots (action-type target trailer comment-p)
+ (git-rebase-current-line)
+ (cond
+ ((and action (eq action-type 'commit))
+ (let ((inhibit-read-only t))
+ (magit-delete-line)
+ (insert (concat action " " target " " trailer "\n"))))
+ ((and action-type (not (or action comment-p)))
+ (let ((inhibit-read-only t))
+ (insert comment-start " "))
+ (forward-line))
+ (t
+ ;; In the case of --rebase-merges, commit lines may have
+ ;; other lines with other action types, empty lines, and
+ ;; "Branch" comments interspersed. Move along.
+ (forward-line)))))
+ (goto-char
+ (if git-rebase-auto-advance
+ end-marker
+ (if pt-below-p (1- end-marker) beg)))
+ (goto-char (line-beginning-position))))
+ (_ (ding))))
+
+(defun git-rebase-line-p (&optional pos)
+ (save-excursion
+ (when pos (goto-char pos))
+ (and (oref (git-rebase-current-line) action-type)
+ t)))
+
+(defun git-rebase-region-bounds (&optional fallback)
+ "Return region bounds if both ends touch rebase lines.
+Each bound is extended to include the entire line touched by the
+point or mark. If the region isn't active and FALLBACK is
+non-nil, return the beginning and end of the current rebase line,
+if any."
+ (cond
+ ((use-region-p)
+ (let ((beg (save-excursion (goto-char (region-beginning))
+ (line-beginning-position)))
+ (end (save-excursion (goto-char (region-end))
+ (line-end-position))))
+ (when (and (git-rebase-line-p beg)
+ (git-rebase-line-p end))
+ (list beg (1+ end)))))
+ ((and fallback (git-rebase-line-p))
+ (list (line-beginning-position)
+ (1+ (line-end-position))))))
+
+(defun git-rebase-move-line-down (n)
+ "Move the current commit (or command) N lines down.
+If N is negative, move the commit up instead. With an active
+region, move all the lines that the region touches, not just the
+current line."
+ (interactive "p")
+ (pcase-let* ((`(,beg ,end)
+ (or (git-rebase-region-bounds)
+ (list (line-beginning-position)
+ (1+ (line-end-position)))))
+ (pt-offset (- (point) beg))
+ (mark-offset (and mark-active (- (mark) beg))))
+ (save-restriction
+ (narrow-to-region
+ (point-min)
+ (1-
+ (if git-rebase-show-instructions
+ (save-excursion
+ (goto-char (point-min))
+ (while (or (git-rebase-line-p)
+ ;; The output for --rebase-merges has empty
+ ;; lines and "Branch" comments interspersed.
+ (looking-at-p "^$")
+ (looking-at-p (concat git-rebase-comment-re
+ " Branch")))
+ (forward-line))
+ (line-beginning-position))
+ (point-max))))
+ (if (or (and (< n 0) (= beg (point-min)))
+ (and (> n 0) (= end (point-max)))
+ (> end (point-max)))
+ (ding)
+ (goto-char (if (< n 0) beg end))
+ (forward-line n)
+ (atomic-change-group
+ (let ((inhibit-read-only t))
+ (insert (delete-and-extract-region beg end)))
+ (let ((new-beg (- (point) (- end beg))))
+ (when (use-region-p)
+ (setq deactivate-mark nil)
+ (set-mark (+ new-beg mark-offset)))
+ (goto-char (+ new-beg pt-offset))))))))
+
+(defun git-rebase-move-line-up (n)
+ "Move the current commit (or command) N lines up.
+If N is negative, move the commit down instead. With an active
+region, move all the lines that the region touches, not just the
+current line."
+ (interactive "p")
+ (git-rebase-move-line-down (- n)))
+
+(defun git-rebase-highlight-region (start end window rol)
+ (let ((inhibit-read-only t)
+ (deactivate-mark nil)
+ (bounds (git-rebase-region-bounds)))
+ (mapc #'delete-overlay magit-section-highlight-overlays)
+ (when bounds
+ (magit-section-make-overlay (car bounds) (cadr bounds)
+ 'magit-section-heading-selection))
+ (if (and bounds (not magit-section-keep-region-overlay))
+ (funcall (default-value 'redisplay-unhighlight-region-function) rol)
+ (funcall (default-value 'redisplay-highlight-region-function)
+ start end window rol))))
+
+(defun git-rebase-unhighlight-region (rol)
+ (mapc #'delete-overlay magit-section-highlight-overlays)
+ (funcall (default-value 'redisplay-unhighlight-region-function) rol))
+
+(defun git-rebase-kill-line ()
+ "Kill the current action line.
+If the region is active, act on all lines touched by the region."
+ (interactive)
+ (git-rebase-set-action nil))
+
+(defun git-rebase-insert (rev)
+ "Read an arbitrary commit and insert it below current line."
+ (interactive (list (magit-read-branch-or-commit "Insert revision")))
+ (forward-line)
+ (--if-let (magit-rev-format "%h %s" rev)
+ (let ((inhibit-read-only t))
+ (insert "pick " it ?\n))
+ (user-error "Unknown revision")))
+
+(defun git-rebase-set-noncommit-action (action value-fn arg)
+ (goto-char (line-beginning-position))
+ (pcase-let* ((inhibit-read-only t)
+ (`(,initial ,trailer ,comment-p)
+ (and (not arg)
+ (with-slots ((ln-action action)
+ target trailer comment-p)
+ (git-rebase-current-line)
+ (and (equal ln-action action)
+ (list target trailer comment-p)))))
+ (value (funcall value-fn initial)))
+ (pcase (list value initial comment-p)
+ (`("" nil ,_)
+ (ding))
+ (`("" ,_ ,_)
+ (magit-delete-line))
+ (_
+ (if initial
+ (magit-delete-line)
+ (forward-line))
+ (insert (concat action " " value
+ (and (equal value initial)
+ trailer
+ (concat " " trailer))
+ "\n"))
+ (unless git-rebase-auto-advance
+ (forward-line -1))))))
+
+(defun git-rebase-exec (arg)
+ "Insert a shell command to be run after the current commit.
+
+If there already is such a command on the current line, then edit
+that instead. With a prefix argument insert a new command even
+when there already is one on the current line. With empty input
+remove the command on the current line, if any."
+ (interactive "P")
+ (git-rebase-set-noncommit-action
+ "exec"
+ (lambda (initial) (read-shell-command "Execute: " initial))
+ arg))
+
+(defun git-rebase-label (arg)
+ "Add a label after the current commit.
+If there already is a label on the current line, then edit that
+instead. With a prefix argument, insert a new label even when
+there is already a label on the current line. With empty input,
+remove the label on the current line, if any."
+ (interactive "P")
+ (git-rebase-set-noncommit-action
+ "label"
+ (lambda (initial)
+ (read-from-minibuffer
+ "Label: " initial magit-minibuffer-local-ns-map))
+ arg))
+
+(defun git-rebase-buffer-labels ()
+ (let (labels)
+ (save-excursion
+ (goto-char (point-min))
+ (while (re-search-forward "^\\(?:l\\|label\\) \\([^ \n]+\\)" nil t)
+ (push (match-string-no-properties 1) labels)))
+ (nreverse labels)))
+
+(defun git-rebase-reset (arg)
+ "Reset the current HEAD to a label.
+If there already is a reset command on the current line, then
+edit that instead. With a prefix argument, insert a new reset
+line even when point is already on a reset line. With empty
+input, remove the reset command on the current line, if any."
+ (interactive "P")
+ (git-rebase-set-noncommit-action
+ "reset"
+ (lambda (initial)
+ (or (magit-completing-read "Label" (git-rebase-buffer-labels)
+ nil t initial)
+ ""))
+ arg))
+
+(defun git-rebase-merge (arg)
+ "Add a merge command after the current commit.
+If there is already a merge command on the current line, then
+replace that command instead. With a prefix argument, insert a
+new merge command even when there is already one on the current
+line. With empty input, remove the merge command on the current
+line, if any."
+ (interactive "P")
+ (git-rebase-set-noncommit-action
+ "merge"
+ (lambda (_)
+ (or (magit-completing-read "Merge" (git-rebase-buffer-labels))
+ ""))
+ arg))
+
+(defun git-rebase-merge-toggle-editmsg ()
+ "Toggle whether an editor is invoked when performing the merge at point.
+When a merge command uses a lower-case -c, the message for the
+specified commit will be opened in an editor before creating the
+commit. For an upper-case -C, the message will be used as is."
+ (interactive)
+ (with-slots (action-type target action-options trailer)
+ (git-rebase-current-line)
+ (if (eq action-type 'merge)
+ (let ((inhibit-read-only t))
+ (magit-delete-line)
+ (insert
+ (format "merge %s %s %s\n"
+ (replace-regexp-in-string
+ "-[cC]" (lambda (c)
+ (if (equal c "-c") "-C" "-c"))
+ action-options t t)
+ target
+ trailer)))
+ (ding))))
+
+(defun git-rebase-set-bare-action (action arg)
+ (goto-char (line-beginning-position))
+ (with-slots ((ln-action action) comment-p)
+ (git-rebase-current-line)
+ (let ((same-action-p (equal action ln-action))
+ (inhibit-read-only t))
+ (when (or arg
+ (not ln-action)
+ (not same-action-p)
+ (and same-action-p comment-p))
+ (unless (or arg (not same-action-p))
+ (magit-delete-line))
+ (insert action ?\n)
+ (unless git-rebase-auto-advance
+ (forward-line -1))))))
+
+(defun git-rebase-noop (&optional arg)
+ "Add noop action at point.
+
+If the current line already contains a noop action, leave it
+unchanged. If there is a commented noop action present, remove
+the comment. Otherwise add a new noop action. With a prefix
+argument insert a new noop action regardless of what is already
+present on the current line.
+
+A noop action can be used to make git perform a rebase even if
+no commits are selected. Without the noop action present, git
+would see an empty file and therefore do nothing."
+ (interactive "P")
+ (git-rebase-set-bare-action "noop" arg))
+
+(defun git-rebase-break (&optional arg)
+ "Add break action at point.
+
+If there is a commented break action present, remove the comment.
+If the current line already contains a break action, add another
+break action only if a prefix argument is given.
+
+A break action can be used to interrupt the rebase at the
+specified point. It is particularly useful for pausing before
+the first commit in the sequence. For other cases, the
+equivalent behavior can be achieved with `git-rebase-edit'."
+ (interactive "P")
+ (git-rebase-set-bare-action "break" arg))
+
+(defun git-rebase-undo (&optional arg)
+ "Undo some previous changes.
+Like `undo' but works in read-only buffers."
+ (interactive "P")
+ (let ((inhibit-read-only t))
+ (undo arg)))
+
+(defun git-rebase--show-commit (&optional scroll)
+ (let ((disable-magit-save-buffers t))
+ (save-excursion
+ (goto-char (line-beginning-position))
+ (--if-let (with-slots (action-type target) (git-rebase-current-line)
+ (and (eq action-type 'commit)
+ target))
+ (pcase scroll
+ ('up (magit-diff-show-or-scroll-up))
+ ('down (magit-diff-show-or-scroll-down))
+ (_ (apply #'magit-show-commit it
+ (magit-diff-arguments 'magit-revision-mode))))
+ (ding)))))
+
+(defun git-rebase-show-commit ()
+ "Show the commit on the current line if any."
+ (interactive)
+ (git-rebase--show-commit))
+
+(defun git-rebase-show-or-scroll-up ()
+ "Update the commit buffer for commit on current line.
+
+Either show the commit at point in the appropriate buffer, or if
+that buffer is already being displayed in the current frame and
+contains information about that commit, then instead scroll the
+buffer up."
+ (interactive)
+ (git-rebase--show-commit 'up))
+
+(defun git-rebase-show-or-scroll-down ()
+ "Update the commit buffer for commit on current line.
+
+Either show the commit at point in the appropriate buffer, or if
+that buffer is already being displayed in the current frame and
+contains information about that commit, then instead scroll the
+buffer down."
+ (interactive)
+ (git-rebase--show-commit 'down))
+
+(defun git-rebase-backward-line (&optional n)
+ "Move N lines backward (forward if N is negative).
+Like `forward-line' but go into the opposite direction."
+ (interactive "p")
+ (forward-line (- (or n 1))))
+
+;;; Mode
+
+;;;###autoload
+(define-derived-mode git-rebase-mode special-mode "Git Rebase"
+ "Major mode for editing of a Git rebase file.
+
+Rebase files are generated when you run 'git rebase -i' or run
+`magit-interactive-rebase'. They describe how Git should perform
+the rebase. See the documentation for git-rebase (e.g., by
+running 'man git-rebase' at the command line) for details."
+ :group 'git-rebase
+ (setq comment-start (or (magit-get "core.commentChar") "#"))
+ (setq git-rebase-comment-re (concat "^" (regexp-quote comment-start)))
+ (setq font-lock-defaults (list (git-rebase-mode-font-lock-keywords) t t))
+ (unless git-rebase-show-instructions
+ (let ((inhibit-read-only t))
+ (flush-lines git-rebase-comment-re)))
+ (unless with-editor-mode
+ ;; Maybe already enabled when using `shell-command' or an Emacs shell.
+ (with-editor-mode 1))
+ (when git-rebase-confirm-cancel
+ (add-hook 'with-editor-cancel-query-functions
+ #'git-rebase-cancel-confirm nil t))
+ (setq-local redisplay-highlight-region-function #'git-rebase-highlight-region)
+ (setq-local redisplay-unhighlight-region-function #'git-rebase-unhighlight-region)
+ (add-hook 'with-editor-pre-cancel-hook #'git-rebase-autostash-save nil t)
+ (add-hook 'with-editor-post-cancel-hook #'git-rebase-autostash-apply nil t)
+ (setq imenu-prev-index-position-function
+ #'magit-imenu--rebase-prev-index-position-function)
+ (setq imenu-extract-index-name-function
+ #'magit-imenu--rebase-extract-index-name-function)
+ (when (boundp 'save-place)
+ (setq save-place nil)))
+
+(defun git-rebase-cancel-confirm (force)
+ (or (not (buffer-modified-p))
+ force
+ (magit-confirm 'abort-rebase "Abort this rebase" nil 'noabort)))
+
+(defun git-rebase-autostash-save ()
+ (--when-let (magit-file-line (magit-git-dir "rebase-merge/autostash"))
+ (push (cons 'stash it) with-editor-cancel-alist)))
+
+(defun git-rebase-autostash-apply ()
+ (--when-let (cdr (assq 'stash with-editor-cancel-alist))
+ (magit-stash-apply it)))
+
+(defun git-rebase-match-comment-line (limit)
+ (re-search-forward (concat git-rebase-comment-re ".*") limit t))
+
+(defun git-rebase-mode-font-lock-keywords ()
+ "Font lock keywords for Git-Rebase mode."
+ `((,(concat "^" (cdr (assq 'commit git-rebase-line-regexps)))
+ (1 'git-rebase-action)
+ (3 'git-rebase-hash)
+ (4 'git-rebase-description))
+ (,(concat "^" (cdr (assq 'exec git-rebase-line-regexps)))
+ (1 'git-rebase-action)
+ (3 'git-rebase-description))
+ (,(concat "^" (cdr (assq 'bare git-rebase-line-regexps)))
+ (1 'git-rebase-action))
+ (,(concat "^" (cdr (assq 'label git-rebase-line-regexps)))
+ (1 'git-rebase-action)
+ (3 'git-rebase-label)
+ (4 'font-lock-comment-face))
+ ("^\\(m\\(?:erge\\)?\\) -[Cc] \\([^ \n]+\\) \\([^ \n]+\\)\\( #.*\\)?"
+ (1 'git-rebase-action)
+ (2 'git-rebase-hash)
+ (3 'git-rebase-label)
+ (4 'font-lock-comment-face))
+ ("^\\(m\\(?:erge\\)?\\) \\([^ \n]+\\)"
+ (1 'git-rebase-action)
+ (2 'git-rebase-label))
+ (,(concat git-rebase-comment-re " *"
+ (cdr (assq 'commit git-rebase-line-regexps)))
+ 0 'git-rebase-killed-action t)
+ (git-rebase-match-comment-line 0 'font-lock-comment-face)
+ ("\\[[^[]*\\]"
+ 0 'magit-keyword t)
+ ("\\(?:fixup!\\|squash!\\)"
+ 0 'magit-keyword-squash t)
+ (,(format "^%s Rebase \\([^ ]*\\) onto \\([^ ]*\\)" comment-start)
+ (1 'git-rebase-comment-hash t)
+ (2 'git-rebase-comment-hash t))
+ (,(format "^%s \\(Commands:\\)" comment-start)
+ (1 'git-rebase-comment-heading t))
+ (,(format "^%s Branch \\(.*\\)" comment-start)
+ (1 'git-rebase-label t))))
+
+(defun git-rebase-mode-show-keybindings ()
+ "Modify the \"Commands:\" section of the comment Git generates
+at the bottom of the file so that in place of the one-letter
+abbreviation for the command, it shows the command's keybinding.
+By default, this is the same except for the \"pick\" command."
+ (let ((inhibit-read-only t))
+ (save-excursion
+ (goto-char (point-min))
+ (when (and git-rebase-show-instructions
+ (re-search-forward
+ (concat git-rebase-comment-re "\\s-+p, pick")
+ nil t))
+ (goto-char (line-beginning-position))
+ (pcase-dolist (`(,cmd . ,desc) git-rebase-command-descriptions)
+ (insert (format "%s %-8s %s\n"
+ comment-start
+ (substitute-command-keys (format "\\[%s]" cmd))
+ desc)))
+ (while (re-search-forward (concat git-rebase-comment-re
+ "\\( ?\\)\\([^\n,],\\) "
+ "\\([^\n ]+\\) ")
+ nil t)
+ (let ((cmd (intern (concat "git-rebase-" (match-string 3)))))
+ (if (not (fboundp cmd))
+ (delete-region (line-beginning-position) (1+ (line-end-position)))
+ (replace-match " " t t nil 1)
+ (replace-match
+ (format "%-8s"
+ (mapconcat #'key-description
+ (--remove (eq (elt it 0) 'menu-bar)
+ (reverse (where-is-internal
+ cmd git-rebase-mode-map)))
+ ", "))
+ t t nil 2))))))))
+
+(add-hook 'git-rebase-mode-hook #'git-rebase-mode-show-keybindings t)
+
+(defun git-rebase-mode-disable-before-save-hook ()
+ (set (make-local-variable 'before-save-hook) nil))
+
+(add-hook 'git-rebase-mode-hook #'git-rebase-mode-disable-before-save-hook)
+
+;;;###autoload
+(defconst git-rebase-filename-regexp "/git-rebase-todo\\'")
+;;;###autoload
+(add-to-list 'auto-mode-alist
+ (cons git-rebase-filename-regexp #'git-rebase-mode))
+
+(add-to-list 'with-editor-server-window-alist
+ (cons git-rebase-filename-regexp #'switch-to-buffer))
+
+(with-eval-after-load 'recentf
+ (add-to-list 'recentf-exclude git-rebase-filename-regexp))
+
+(add-to-list 'with-editor-file-name-history-exclude git-rebase-filename-regexp)
+
+;;; Imenu Support
+
+(defun magit-imenu--rebase-prev-index-position-function ()
+ "Move point to previous commit in git-rebase buffer.
+Used as a value for `imenu-prev-index-position-function'."
+ (catch 'found
+ (while (not (bobp))
+ (git-rebase-backward-line)
+ (when (git-rebase-line-p)
+ (throw 'found t)))))
+
+(defun magit-imenu--rebase-extract-index-name-function ()
+ "Return imenu name for line at point.
+Point should be at the beginning of the line. This function
+is used as a value for `imenu-extract-index-name-function'."
+ (buffer-substring-no-properties (line-beginning-position)
+ (line-end-position)))
+
+;;; _
+(provide 'git-rebase)
+;;; git-rebase.el ends here