git-rebase--interactive.sh - git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2006 Johannes E. Schindelin

 # SHORT DESCRIPTION
 #
 # This script makes it easy to fix up commits in the middle of a series,
 # and rearrange commits.
 #
 # The original idea comes from Eric W. Biederman, in
 # http://article.gmane.org/gmane.comp.version-control.git/22407

 USAGE='(--continue | --abort | --skip | [--preserve-merges] [--verbose]
 	[--onto <branch>] <upstream> [<branch>])'

 OPTIONS_SPEC=
 . git-sh-setup
 require_work_tree

 DOTEST="$GIT_DIR/.dotest-merge"
 TODO="$DOTEST"/git-rebase-todo
 DONE="$DOTEST"/done
 MSG="$DOTEST"/message
 SQUASH_MSG="$DOTEST"/message-squash
 REWRITTEN="$DOTEST"/rewritten
 PRESERVE_MERGES=
 STRATEGY=
 VERBOSE=
 test -d "$REWRITTEN" && PRESERVE_MERGES=t
 test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
 test -f "$DOTEST"/verbose && VERBOSE=t

 GIT_CHERRY_PICK_HELP="  After resolving the conflicts,
 mark the corrected paths with 'git add <paths>', and
 run 'git rebase --continue'"
 export GIT_CHERRY_PICK_HELP

 warn () {
 	echo "$*" >&2
 }

 output () {
 	case "$VERBOSE" in
 	'')
 		output=$("$@" 2>&1 )
 		status=$?
 		test $status != 0 && printf "%s\n" "$output"
 		return $status
 		;;
 	*)
 		"$@"
 		;;
 	esac
 }

 require_clean_work_tree () {
 	# test if working tree is dirty
 	git rev-parse --verify HEAD > /dev/null &&
 	git update-index --refresh &&
 	git diff-files --quiet &&
 	git diff-index --cached --quiet HEAD -- ||
 	die "Working tree is dirty"
 }

 ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"

 comment_for_reflog () {
 	case "$ORIG_REFLOG_ACTION" in
 	''|rebase*)
 		GIT_REFLOG_ACTION="rebase -i ($1)"
 		export GIT_REFLOG_ACTION
 		;;
 	esac
 }

 last_count=
 mark_action_done () {
 	sed -e 1q < "$TODO" >> "$DONE"
 	sed -e 1d < "$TODO" >> "$TODO".new
 	mv -f "$TODO".new "$TODO"
 	count=$(grep -c '^[^#]' < "$DONE")
 	total=$(($count+$(grep -c '^[^#]' < "$TODO")))
 	if test "$last_count" != "$count"
 	then
 		last_count=$count
 		printf "Rebasing (%d/%d)\r" $count $total
 		test -z "$VERBOSE" || echo
 	fi
 }

 make_patch () {
 	parent_sha1=$(git rev-parse --verify "$1"^) ||
 		die "Cannot get patch for $1^"
 	git diff-tree -p "$parent_sha1".."$1" > "$DOTEST"/patch
 	test -f "$DOTEST"/message ||
 		git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
 	test -f "$DOTEST"/author-script ||
 		get_author_ident_from_commit "$1" > "$DOTEST"/author-script
 }

 die_with_patch () {
 	make_patch "$1"
 	git rerere
 	die "$2"
 }

 die_abort () {
 	rm -rf "$DOTEST"
 	die "$1"
 }

 has_action () {
 	grep '^[^#]' "$1" >/dev/null
 }

 pick_one () {
 	no_ff=
 	case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
 	output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 	test -d "$REWRITTEN" &&
 		pick_one_preserving_merges "$@" && return
 	parent_sha1=$(git rev-parse --verify $sha1^) ||
 		die "Could not get the parent of $sha1"
 	current_sha1=$(git rev-parse --verify HEAD)
 	if test "$no_ff$current_sha1" = "$parent_sha1"; then
 		output git reset --hard $sha1
 		test "a$1" = a-n && output git reset --soft $current_sha1
 		sha1=$(git rev-parse --short $sha1)
 		output warn Fast forward to $sha1
 	else
 		output git cherry-pick "$@"
 	fi
 }

 pick_one_preserving_merges () {
 	case "$1" in -n) sha1=$2 ;; *) sha1=$1 ;; esac
 	sha1=$(git rev-parse $sha1)

 	if test -f "$DOTEST"/current-commit
 	then
 		current_commit=$(cat "$DOTEST"/current-commit) &&
 		git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
 		rm "$DOTEST"/current-commit ||
 		die "Cannot write current commit's replacement sha1"
 	fi

 	# rewrite parents; if none were rewritten, we can fast-forward.
 	fast_forward=t
 	preserve=t
 	new_parents=
 	for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
 	do
 		if test -f "$REWRITTEN"/$p
 		then
 			preserve=f
 			new_p=$(cat "$REWRITTEN"/$p)
 			test $p != $new_p && fast_forward=f
 			case "$new_parents" in
 			*$new_p*)
 				;; # do nothing; that parent is already there
 			*)
 				new_parents="$new_parents $new_p"
 				;;
 			esac
 		fi
 	done
 	case $fast_forward in
 	t)
 		output warn "Fast forward to $sha1"
 		test $preserve = f || echo $sha1 > "$REWRITTEN"/$sha1
 		;;
 	f)
 		test "a$1" = a-n && die "Refusing to squash a merge: $sha1"

 		first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
 		# detach HEAD to current parent
 		output git checkout $first_parent 2> /dev/null ||
 			die "Cannot move HEAD to $first_parent"

 		echo $sha1 > "$DOTEST"/current-commit
 		case "$new_parents" in
 		' '*' '*)
 			# redo merge
 			author_script=$(get_author_ident_from_commit $sha1)
 			eval "$author_script"
 			msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
 			# No point in merging the first parent, that's HEAD
 			new_parents=${new_parents# $first_parent}
 			if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 				GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 				GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 				output git merge $STRATEGY -m "$msg" \
 					$new_parents
 			then
 				git rerere
 				printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
 				die Error redoing merge $sha1
 			fi
 			;;
 		*)
 			output git cherry-pick "$@" ||
 				die_with_patch $sha1 "Could not pick $sha1"
 			;;
 		esac
 		;;
 	esac
 }

 nth_string () {
 	case "$1" in
 	*1[0-9]|*[04-9]) echo "$1"th;;
 	*1) echo "$1"st;;
 	*2) echo "$1"nd;;
 	*3) echo "$1"rd;;
 	esac
 }

 make_squash_message () {
 	if test -f "$SQUASH_MSG"; then
 		COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
 			< "$SQUASH_MSG" | sed -ne '$p')+1))
 		echo "# This is a combination of $COUNT commits."
 		sed -e 1d -e '2,/^./{
 			/^$/d
 		}' <"$SQUASH_MSG"
 	else
 		COUNT=2
 		echo "# This is a combination of two commits."
 		echo "# The first commit's message is:"
 		echo
 		git cat-file commit HEAD | sed -e '1,/^$/d'
 	fi
 	echo
 	echo "# This is the $(nth_string $COUNT) commit message:"
 	echo
 	git cat-file commit $1 | sed -e '1,/^$/d'
 }

 peek_next_command () {
 	sed -n "1s/ .*$//p" < "$TODO"
 }

 do_next () {
 	rm -f "$DOTEST"/message "$DOTEST"/author-script \
 		"$DOTEST"/amend || exit
 	read command sha1 rest < "$TODO"
 	case "$command" in
 	'#'*|'')
 		mark_action_done
 		;;
 	pick|p)
 		comment_for_reflog pick

 		mark_action_done
 		pick_one $sha1 ||
 			die_with_patch $sha1 "Could not apply $sha1... $rest"
 		;;
 	edit|e)
 		comment_for_reflog edit

 		mark_action_done
 		pick_one $sha1 ||
 			die_with_patch $sha1 "Could not apply $sha1... $rest"
 		make_patch $sha1
 		: > "$DOTEST"/amend
 		warn
 		warn "You can amend the commit now, with"
 		warn
 		warn "	git commit --amend"
 		warn
 		warn "Once you are satisfied with your changes, run"
 		warn
 		warn "	git rebase --continue"
 		warn
 		exit 0
 		;;
 	squash|s)
 		comment_for_reflog squash

 		has_action "$DONE" ||
 			die "Cannot 'squash' without a previous commit"

 		mark_action_done
 		make_squash_message $sha1 > "$MSG"
 		case "$(peek_next_command)" in
 		squash|s)
 			EDIT_COMMIT=
 			USE_OUTPUT=output
 			cp "$MSG" "$SQUASH_MSG"
 			;;
 		*)
 			EDIT_COMMIT=-e
 			USE_OUTPUT=
 			rm -f "$SQUASH_MSG" || exit
 			;;
 		esac

 		failed=f
 		author_script=$(get_author_ident_from_commit HEAD)
 		output git reset --soft HEAD^
 		pick_one -n $sha1 || failed=t
 		echo "$author_script" > "$DOTEST"/author-script
 		if test $failed = f
 		then
 			# This is like --amend, but with a different message
 			eval "$author_script"
 			GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
 			GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
 			GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
 			$USE_OUTPUT git commit --no-verify -F "$MSG" $EDIT_COMMIT || failed=t
 		fi
 		if test $failed = t
 		then
 			cp "$MSG" "$GIT_DIR"/MERGE_MSG
 			warn
 			warn "Could not apply $sha1... $rest"
 			die_with_patch $sha1 ""
 		fi
 		;;
 	*)
 		warn "Unknown command: $command $sha1 $rest"
 		die_with_patch $sha1 "Please fix this in the file $TODO."
 		;;
 	esac
 	test -s "$TODO" && return

 	comment_for_reflog finish &&
 	HEADNAME=$(cat "$DOTEST"/head-name) &&
 	OLDHEAD=$(cat "$DOTEST"/head) &&
 	SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
 	if test -d "$REWRITTEN"
 	then
 		test -f "$DOTEST"/current-commit &&
 			current_commit=$(cat "$DOTEST"/current-commit) &&
 			git rev-parse HEAD > "$REWRITTEN"/$current_commit
 		if test -f "$REWRITTEN"/$OLDHEAD
 		then
 			NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
 		else
 			NEWHEAD=$OLDHEAD
 		fi
 	else
 		NEWHEAD=$(git rev-parse HEAD)
 	fi &&
 	case $HEADNAME in
 	refs/*)
 		message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
 		git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
 		git symbolic-ref HEAD $HEADNAME
 		;;
 	esac && {
 		test ! -f "$DOTEST"/verbose ||
 			git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 	} &&
 	rm -rf "$DOTEST" &&
 	git gc --auto &&
 	warn "Successfully rebased and updated $HEADNAME."

 	exit
 }

 do_rest () {
 	while :
 	do
 		do_next
 	done
 }

 while test $# != 0
 do
 	case "$1" in
 	--continue)
 		comment_for_reflog continue

 		test -d "$DOTEST" || die "No interactive rebase running"

 		# Sanity check
 		git rev-parse --verify HEAD >/dev/null ||
 			die "Cannot read HEAD"
 		git update-index --refresh && git diff-files --quiet ||
 			die "Working tree is dirty"

 		# do we have anything to commit?
 		if git diff-index --cached --quiet HEAD --
 		then
 			: Nothing to commit -- skip this
 		else
 			. "$DOTEST"/author-script ||
 				die "Cannot find the author identity"
 			if test -f "$DOTEST"/amend
 			then
 				git reset --soft HEAD^ ||
 				die "Cannot rewind the HEAD"
 			fi
 			export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
 			git commit --no-verify -F "$DOTEST"/message -e ||
 			die "Could not commit staged changes."
 		fi

 		require_clean_work_tree
 		do_rest
 		;;
 	--abort)
 		comment_for_reflog abort

 		git rerere clear
 		test -d "$DOTEST" || die "No interactive rebase running"

 		HEADNAME=$(cat "$DOTEST"/head-name)
 		HEAD=$(cat "$DOTEST"/head)
 		case $HEADNAME in
 		refs/*)
 			git symbolic-ref HEAD $HEADNAME
 			;;
 		esac &&
 		output git reset --hard $HEAD &&
 		rm -rf "$DOTEST"
 		exit
 		;;
 	--skip)
 		comment_for_reflog skip

 		git rerere clear
 		test -d "$DOTEST" || die "No interactive rebase running"

 		output git reset --hard && do_rest
 		;;
 	-s|--strategy)
 		case "$#,$1" in
 		*,*=*)
 			STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
 		1,*)
 			usage ;;
 		*)
 			STRATEGY="-s $2"
 			shift ;;
 		esac
 		;;
 	-m|--merge)
 		# we use merge anyway
 		;;
 	-C*)
 		die "Interactive rebase uses merge, so $1 does not make sense"
 		;;
 	-v|--verbose)
 		VERBOSE=t
 		;;
 	-p|--preserve-merges)
 		PRESERVE_MERGES=t
 		;;
 	-i|--interactive)
 		# yeah, we know
 		;;
 	''|-h)
 		usage
 		;;
 	*)
 		test -d "$DOTEST" &&
 			die "Interactive rebase already started"

 		git var GIT_COMMITTER_IDENT >/dev/null ||
 			die "You need to set your committer info first"

 		comment_for_reflog start

 		ONTO=
 		case "$1" in
 		--onto)
 			ONTO=$(git rev-parse --verify "$2") ||
 				die "Does not point to a valid commit: $2"
 			shift; shift
 			;;
 		esac

 		require_clean_work_tree

 		if test ! -z "$2"
 		then
 			output git show-ref --verify --quiet "refs/heads/$2" ||
 				die "Invalid branchname: $2"
 			output git checkout "$2" ||
 				die "Could not checkout $2"
 		fi

 		HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
 		UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"

 		mkdir "$DOTEST" || die "Could not create temporary $DOTEST"

 		test -z "$ONTO" && ONTO=$UPSTREAM

 		: > "$DOTEST"/interactive || die "Could not mark as interactive"
 		git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
 			echo "detached HEAD" > "$DOTEST"/head-name

 		echo $HEAD > "$DOTEST"/head
 		echo $UPSTREAM > "$DOTEST"/upstream
 		echo $ONTO > "$DOTEST"/onto
 		test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
 		test t = "$VERBOSE" && : > "$DOTEST"/verbose
 		if test t = "$PRESERVE_MERGES"
 		then
 			# $REWRITTEN contains files for each commit that is
 			# reachable by at least one merge base of $HEAD and
 			# $UPSTREAM. They are not necessarily rewritten, but
 			# their children might be.
 			# This ensures that commits on merged, but otherwise
 			# unrelated side branches are left alone. (Think "X"
 			# in the man page's example.)
 			mkdir "$REWRITTEN" &&
 			for c in $(git merge-base --all $HEAD $UPSTREAM)
 			do
 				echo $ONTO > "$REWRITTEN"/$c ||
 					die "Could not init rewritten commits"
 			done
 			MERGES_OPTION=
 		else
 			MERGES_OPTION=--no-merges
 		fi

 		SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
 		SHORTHEAD=$(git rev-parse --short $HEAD)
 		SHORTONTO=$(git rev-parse --short $ONTO)
 		git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
 			--abbrev=7 --reverse --left-right --cherry-pick \
 			$UPSTREAM...$HEAD | \
 			sed -n "s/^>/pick /p" > "$TODO"
 		cat >> "$TODO" << EOF

 # Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
 #
 # Commands:
 #  pick = use commit
 #  edit = use commit, but stop for amending
 #  squash = use commit, but meld into previous commit
 #
 # If you remove a line here THAT COMMIT WILL BE LOST.
 # However, if you remove everything, the rebase will be aborted.
 #
 EOF

 		has_action "$TODO" ||
 			die_abort "Nothing to do"

 		cp "$TODO" "$TODO".backup
 		git_editor "$TODO" ||
 			die "Could not execute editor"

 		has_action "$TODO" ||
 			die_abort "Nothing to do"

 		output git checkout $ONTO && do_rest
 		;;
 	esac
 	shift
 done
	#!/bin/sh
	#
	# Copyright (c) 2006 Johannes E. Schindelin

	# SHORT DESCRIPTION
	#
	# This script makes it easy to fix up commits in the middle of a series,
	# and rearrange commits.
	#
	# The original idea comes from Eric W. Biederman, in
	# http://article.gmane.org/gmane.comp.version-control.git/22407

	USAGE='(--continue \| --abort \| --skip \| [--preserve-merges] [--verbose]
	[--onto <branch>] <upstream> [<branch>])'

	OPTIONS_SPEC=
	. git-sh-setup
	require_work_tree

	DOTEST="$GIT_DIR/.dotest-merge"
	TODO="$DOTEST"/git-rebase-todo
	DONE="$DOTEST"/done
	MSG="$DOTEST"/message
	SQUASH_MSG="$DOTEST"/message-squash
	REWRITTEN="$DOTEST"/rewritten
	PRESERVE_MERGES=
	STRATEGY=
	VERBOSE=
	test -d "$REWRITTEN" && PRESERVE_MERGES=t
	test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
	test -f "$DOTEST"/verbose && VERBOSE=t

	GIT_CHERRY_PICK_HELP=" After resolving the conflicts,
	mark the corrected paths with 'git add <paths>', and
	run 'git rebase --continue'"
	export GIT_CHERRY_PICK_HELP

	warn () {
	echo "$*" >&2
	}

	output () {
	case "$VERBOSE" in
	'')
	output=$("$@" 2>&1 )
	status=$?
	test $status != 0 && printf "%s\n" "$output"
	return $status
	;;
	*)
	"$@"
	;;
	esac
	}

	require_clean_work_tree () {
	# test if working tree is dirty
	git rev-parse --verify HEAD > /dev/null &&
	git update-index --refresh &&
	git diff-files --quiet &&
	git diff-index --cached --quiet HEAD -- \|\|
	die "Working tree is dirty"
	}

	ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"

	comment_for_reflog () {
	case "$ORIG_REFLOG_ACTION" in
	''\|rebase*)
	GIT_REFLOG_ACTION="rebase -i ($1)"
	export GIT_REFLOG_ACTION
	;;
	esac
	}

	last_count=
	mark_action_done () {
	sed -e 1q < "$TODO" >> "$DONE"
	sed -e 1d < "$TODO" >> "$TODO".new
	mv -f "$TODO".new "$TODO"
	count=$(grep -c '^[^#]' < "$DONE")
	total=$(($count+$(grep -c '^[^#]' < "$TODO")))
	if test "$last_count" != "$count"
	then
	last_count=$count
	printf "Rebasing (%d/%d)\r" $count $total
	test -z "$VERBOSE" \|\| echo
	fi
	}

	make_patch () {
	parent_sha1=$(git rev-parse --verify "$1"^) \|\|
	die "Cannot get patch for $1^"
	git diff-tree -p "$parent_sha1".."$1" > "$DOTEST"/patch
	test -f "$DOTEST"/message \|\|
	git cat-file commit "$1" \| sed "1,/^$/d" > "$DOTEST"/message
	test -f "$DOTEST"/author-script \|\|
	get_author_ident_from_commit "$1" > "$DOTEST"/author-script
	}

	die_with_patch () {
	make_patch "$1"
	git rerere
	die "$2"
	}

	die_abort () {
	rm -rf "$DOTEST"
	die "$1"
	}

	has_action () {
	grep '^[^#]' "$1" >/dev/null
	}

	pick_one () {
	no_ff=
	case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
	output git rev-parse --verify $sha1 \|\| die "Invalid commit name: $sha1"
	test -d "$REWRITTEN" &&
	pick_one_preserving_merges "$@" && return
	parent_sha1=$(git rev-parse --verify $sha1^) \|\|
	die "Could not get the parent of $sha1"
	current_sha1=$(git rev-parse --verify HEAD)
	if test "$no_ff$current_sha1" = "$parent_sha1"; then
	output git reset --hard $sha1
	test "a$1" = a-n && output git reset --soft $current_sha1
	sha1=$(git rev-parse --short $sha1)
	output warn Fast forward to $sha1
	else
	output git cherry-pick "$@"
	fi
	}

	pick_one_preserving_merges () {
	case "$1" in -n) sha1=$2 ;; *) sha1=$1 ;; esac
	sha1=$(git rev-parse $sha1)

	if test -f "$DOTEST"/current-commit
	then
	current_commit=$(cat "$DOTEST"/current-commit) &&
	git rev-parse HEAD > "$REWRITTEN"/$current_commit &&
	rm "$DOTEST"/current-commit \|\|
	die "Cannot write current commit's replacement sha1"
	fi

	# rewrite parents; if none were rewritten, we can fast-forward.
	fast_forward=t
	preserve=t
	new_parents=
	for p in $(git rev-list --parents -1 $sha1 \| cut -d' ' -f2-)
	do
	if test -f "$REWRITTEN"/$p
	then
	preserve=f
	new_p=$(cat "$REWRITTEN"/$p)
	test $p != $new_p && fast_forward=f
	case "$new_parents" in
	$new_p)
	;; # do nothing; that parent is already there
	*)
	new_parents="$new_parents $new_p"
	;;
	esac
	fi
	done
	case $fast_forward in
	t)
	output warn "Fast forward to $sha1"
	test $preserve = f \|\| echo $sha1 > "$REWRITTEN"/$sha1
	;;
	f)
	test "a$1" = a-n && die "Refusing to squash a merge: $sha1"

	first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
	# detach HEAD to current parent
	output git checkout $first_parent 2> /dev/null \|\|
	die "Cannot move HEAD to $first_parent"

	echo $sha1 > "$DOTEST"/current-commit
	case "$new_parents" in
	' '' ')
	# redo merge
	author_script=$(get_author_ident_from_commit $sha1)
	eval "$author_script"
	msg="$(git cat-file commit $sha1 \| sed -e '1,/^$/d')"
	# No point in merging the first parent, that's HEAD
	new_parents=${new_parents# $first_parent}
	if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
	GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
	GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
	output git merge $STRATEGY -m "$msg" \
	$new_parents
	then
	git rerere
	printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
	die Error redoing merge $sha1
	fi
	;;
	*)
	output git cherry-pick "$@" \|\|
	die_with_patch $sha1 "Could not pick $sha1"
	;;
	esac
	;;
	esac
	}

	nth_string () {
	case "$1" in
	1[0-9]\|[04-9]) echo "$1"th;;
	*1) echo "$1"st;;
	*2) echo "$1"nd;;
	*3) echo "$1"rd;;
	esac
	}

	make_squash_message () {
	if test -f "$SQUASH_MSG"; then
	COUNT=$(($(sed -n "s/^# This is [^0-9]\([1-9][0-9]\).*/\1/p" \
	< "$SQUASH_MSG" \| sed -ne '$p')+1))
	echo "# This is a combination of $COUNT commits."
	sed -e 1d -e '2,/^./{
	/^$/d
	}' <"$SQUASH_MSG"
	else
	COUNT=2
	echo "# This is a combination of two commits."
	echo "# The first commit's message is:"
	echo
	git cat-file commit HEAD \| sed -e '1,/^$/d'
	fi
	echo
	echo "# This is the $(nth_string $COUNT) commit message:"
	echo
	git cat-file commit $1 \| sed -e '1,/^$/d'
	}

	peek_next_command () {
	sed -n "1s/ .*$//p" < "$TODO"
	}

	do_next () {
	rm -f "$DOTEST"/message "$DOTEST"/author-script \
	"$DOTEST"/amend \|\| exit
	read command sha1 rest < "$TODO"
	case "$command" in
	'#'*\|'')
	mark_action_done
	;;
	pick\|p)
	comment_for_reflog pick

	mark_action_done
	pick_one $sha1 \|\|
	die_with_patch $sha1 "Could not apply $sha1... $rest"
	;;
	edit\|e)
	comment_for_reflog edit

	mark_action_done
	pick_one $sha1 \|\|
	die_with_patch $sha1 "Could not apply $sha1... $rest"
	make_patch $sha1
	: > "$DOTEST"/amend
	warn
	warn "You can amend the commit now, with"
	warn
	warn " git commit --amend"
	warn
	warn "Once you are satisfied with your changes, run"
	warn
	warn " git rebase --continue"
	warn
	exit 0
	;;
	squash\|s)
	comment_for_reflog squash

	has_action "$DONE" \|\|
	die "Cannot 'squash' without a previous commit"

	mark_action_done
	make_squash_message $sha1 > "$MSG"
	case "$(peek_next_command)" in
	squash\|s)
	EDIT_COMMIT=
	USE_OUTPUT=output
	cp "$MSG" "$SQUASH_MSG"
	;;
	*)
	EDIT_COMMIT=-e
	USE_OUTPUT=
	rm -f "$SQUASH_MSG" \|\| exit
	;;
	esac

	failed=f
	author_script=$(get_author_ident_from_commit HEAD)
	output git reset --soft HEAD^
	pick_one -n $sha1 \|\| failed=t
	echo "$author_script" > "$DOTEST"/author-script
	if test $failed = f
	then
	# This is like --amend, but with a different message
	eval "$author_script"
	GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
	GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
	GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
	$USE_OUTPUT git commit --no-verify -F "$MSG" $EDIT_COMMIT \|\| failed=t
	fi
	if test $failed = t
	then
	cp "$MSG" "$GIT_DIR"/MERGE_MSG
	warn
	warn "Could not apply $sha1... $rest"
	die_with_patch $sha1 ""
	fi
	;;
	*)
	warn "Unknown command: $command $sha1 $rest"
	die_with_patch $sha1 "Please fix this in the file $TODO."
	;;
	esac
	test -s "$TODO" && return

	comment_for_reflog finish &&
	HEADNAME=$(cat "$DOTEST"/head-name) &&
	OLDHEAD=$(cat "$DOTEST"/head) &&
	SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
	if test -d "$REWRITTEN"
	then
	test -f "$DOTEST"/current-commit &&
	current_commit=$(cat "$DOTEST"/current-commit) &&
	git rev-parse HEAD > "$REWRITTEN"/$current_commit
	if test -f "$REWRITTEN"/$OLDHEAD
	then
	NEWHEAD=$(cat "$REWRITTEN"/$OLDHEAD)
	else
	NEWHEAD=$OLDHEAD
	fi
	else
	NEWHEAD=$(git rev-parse HEAD)
	fi &&
	case $HEADNAME in
	refs/*)
	message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
	git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
	git symbolic-ref HEAD $HEADNAME
	;;
	esac && {
	test ! -f "$DOTEST"/verbose \|\|
	git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
	} &&
	rm -rf "$DOTEST" &&
	git gc --auto &&
	warn "Successfully rebased and updated $HEADNAME."

	exit
	}

	do_rest () {
	while :
	do
	do_next
	done
	}

	while test $# != 0
	do
	case "$1" in
	--continue)
	comment_for_reflog continue

	test -d "$DOTEST" \|\| die "No interactive rebase running"

	# Sanity check
	git rev-parse --verify HEAD >/dev/null \|\|
	die "Cannot read HEAD"
	git update-index --refresh && git diff-files --quiet \|\|
	die "Working tree is dirty"

	# do we have anything to commit?
	if git diff-index --cached --quiet HEAD --
	then
	: Nothing to commit -- skip this
	else
	. "$DOTEST"/author-script \|\|
	die "Cannot find the author identity"
	if test -f "$DOTEST"/amend
	then
	git reset --soft HEAD^ \|\|
	die "Cannot rewind the HEAD"
	fi
	export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
	git commit --no-verify -F "$DOTEST"/message -e \|\|
	die "Could not commit staged changes."
	fi

	require_clean_work_tree
	do_rest
	;;
	--abort)
	comment_for_reflog abort

	git rerere clear
	test -d "$DOTEST" \|\| die "No interactive rebase running"

	HEADNAME=$(cat "$DOTEST"/head-name)
	HEAD=$(cat "$DOTEST"/head)
	case $HEADNAME in
	refs/*)
	git symbolic-ref HEAD $HEADNAME
	;;
	esac &&
	output git reset --hard $HEAD &&
	rm -rf "$DOTEST"
	exit
	;;
	--skip)
	comment_for_reflog skip

	git rerere clear
	test -d "$DOTEST" \|\| die "No interactive rebase running"

	output git reset --hard && do_rest
	;;
	-s\|--strategy)
	case "$#,$1" in
	,=*)
	STRATEGY="-s "$(expr "z$1" : 'z-[^=]=\(.\)') ;;
	1,*)
	usage ;;
	*)
	STRATEGY="-s $2"
	shift ;;
	esac
	;;
	-m\|--merge)
	# we use merge anyway
	;;
	-C*)
	die "Interactive rebase uses merge, so $1 does not make sense"
	;;
	-v\|--verbose)
	VERBOSE=t
	;;
	-p\|--preserve-merges)
	PRESERVE_MERGES=t
	;;
	-i\|--interactive)
	# yeah, we know
	;;
	''\|-h)
	usage
	;;
	*)
	test -d "$DOTEST" &&
	die "Interactive rebase already started"

	git var GIT_COMMITTER_IDENT >/dev/null \|\|
	die "You need to set your committer info first"

	comment_for_reflog start

	ONTO=
	case "$1" in
	--onto)
	ONTO=$(git rev-parse --verify "$2") \|\|
	die "Does not point to a valid commit: $2"
	shift; shift
	;;
	esac

	require_clean_work_tree

	if test ! -z "$2"
	then
	output git show-ref --verify --quiet "refs/heads/$2" \|\|
	die "Invalid branchname: $2"
	output git checkout "$2" \|\|
	die "Could not checkout $2"
	fi

	HEAD=$(git rev-parse --verify HEAD) \|\| die "No HEAD?"
	UPSTREAM=$(git rev-parse --verify "$1") \|\| die "Invalid base"

	mkdir "$DOTEST" \|\| die "Could not create temporary $DOTEST"

	test -z "$ONTO" && ONTO=$UPSTREAM

	: > "$DOTEST"/interactive \|\| die "Could not mark as interactive"
	git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null \|\|
	echo "detached HEAD" > "$DOTEST"/head-name

	echo $HEAD > "$DOTEST"/head
	echo $UPSTREAM > "$DOTEST"/upstream
	echo $ONTO > "$DOTEST"/onto
	test -z "$STRATEGY" \|\| echo "$STRATEGY" > "$DOTEST"/strategy
	test t = "$VERBOSE" && : > "$DOTEST"/verbose
	if test t = "$PRESERVE_MERGES"
	then
	# $REWRITTEN contains files for each commit that is
	# reachable by at least one merge base of $HEAD and
	# $UPSTREAM. They are not necessarily rewritten, but
	# their children might be.
	# This ensures that commits on merged, but otherwise
	# unrelated side branches are left alone. (Think "X"
	# in the man page's example.)
	mkdir "$REWRITTEN" &&
	for c in $(git merge-base --all $HEAD $UPSTREAM)
	do
	echo $ONTO > "$REWRITTEN"/$c \|\|
	die "Could not init rewritten commits"
	done
	MERGES_OPTION=
	else
	MERGES_OPTION=--no-merges
	fi

	SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
	SHORTHEAD=$(git rev-parse --short $HEAD)
	SHORTONTO=$(git rev-parse --short $ONTO)
	git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
	--abbrev=7 --reverse --left-right --cherry-pick \
	$UPSTREAM...$HEAD \| \
	sed -n "s/^>/pick /p" > "$TODO"
	cat >> "$TODO" << EOF

	# Rebase $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
	#
	# Commands:
	# pick = use commit
	# edit = use commit, but stop for amending
	# squash = use commit, but meld into previous commit
	#
	# If you remove a line here THAT COMMIT WILL BE LOST.
	# However, if you remove everything, the rebase will be aborted.
	#
	EOF

	has_action "$TODO" \|\|
	die_abort "Nothing to do"

	cp "$TODO" "$TODO".backup
	git_editor "$TODO" \|\|
	die "Could not execute editor"

	has_action "$TODO" \|\|
	die_abort "Nothing to do"

	output git checkout $ONTO && do_rest
	;;
	esac
	shift
	done