preload-index.c: use the right index instead of the_index
[gitweb.git] / git-rebase--interactive.sh
index 331c8dfeac3cac2fd2d9d9287d5c487669fe80a0..299ded21375ed3146052b9887dd2b56216404105 100644 (file)
 # file and written to the tail of $done.
 todo="$state_dir"/git-rebase-todo
 
-# The rebase command lines that have already been processed.  A line
-# is moved here when it is first handled, before any associated user
-# actions.
-done="$state_dir"/done
-
-# The commit message that is planned to be used for any changes that
-# need to be committed following a user interaction.
-msg="$state_dir"/message
-
-# The file into which is accumulated the suggested commit message for
-# squash/fixup commands.  When the first of a series of squash/fixups
-# is seen, the file is created and the commit message from the
-# previous commit and from the first squash/fixup commit are written
-# to it.  The commit message for each subsequent squash/fixup commit
-# is appended to the file as it is processed.
-#
-# The first line of the file is of the form
-#     # This is a combination of $count commits.
-# where $count is the number of commits whose messages have been
-# written to the file so far (including the initial "pick" commit).
-# Each time that a commit message is processed, this line is read and
-# updated.  It is deleted just before the combined commit is made.
-squash_msg="$state_dir"/message-squash
-
-# If the current series of squash/fixups has not yet included a squash
-# command, then this file exists and holds the commit message of the
-# original "pick" commit.  (If the series ends without a "squash"
-# command, then this can be used as the commit message of the combined
-# commit without opening the editor.)
-fixup_msg="$state_dir"/message-fixup
-
-# $rewritten is the name of a directory containing files for each
-# commit that is reachable by at least one merge base of $head and
-# $upstream. They are not necessarily rewritten, but their children
-# might be.  This ensures that commits on merged, but otherwise
-# unrelated side branches are left alone. (Think "X" in the man page's
-# example.)
-rewritten="$state_dir"/rewritten
-
-dropped="$state_dir"/dropped
-
-end="$state_dir"/end
-msgnum="$state_dir"/msgnum
-
-# A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
-# GIT_AUTHOR_DATE that will be used for the commit that is currently
-# being rebased.
-author_script="$state_dir"/author-script
-
-# When an "edit" rebase command is being processed, the SHA1 of the
-# commit to be edited is recorded in this file.  When "git rebase
-# --continue" is executed, if there are any staged changes then they
-# will be amended to the HEAD commit, but only provided the HEAD
-# commit is still the commit to be edited.  When any other rebase
-# command is processed, this file is deleted.
-amend="$state_dir"/amend
-
-# For the post-rewrite hook, we make a list of rewritten commits and
-# their new sha1s.  The rewritten-pending list keeps the sha1s of
-# commits that have been processed, but not committed yet,
-# e.g. because they are waiting for a 'squash' command.
-rewritten_list="$state_dir"/rewritten-list
-rewritten_pending="$state_dir"/rewritten-pending
-
-# Work around Git for Windows' Bash whose "read" does not strip CRLF
-# and leaves CR at the end instead.
-cr=$(printf "\015")
-
-strategy_args=${strategy:+--strategy=$strategy}
-test -n "$strategy_opts" &&
-eval '
-       for strategy_opt in '"$strategy_opts"'
-       do
-               strategy_args="$strategy_args -X$(git rev-parse --sq-quote "${strategy_opt#--}")"
-       done
-'
-
 GIT_CHERRY_PICK_HELP="$resolvemsg"
 export GIT_CHERRY_PICK_HELP
 
@@ -105,15 +28,6 @@ case "$comment_char" in
        ;;
 esac
 
-warn () {
-       printf '%s\n' "$*" >&2
-}
-
-# Output the commit message for the specified commit.
-commit_message () {
-       git cat-file commit "$1" | sed "1,/^$/d"
-}
-
 orig_reflog_action="$GIT_REFLOG_ACTION"
 
 comment_for_reflog () {
@@ -125,43 +39,22 @@ comment_for_reflog () {
        esac
 }
 
-last_count=
-mark_action_done () {
-       sed -e 1q < "$todo" >> "$done"
-       sed -e 1d < "$todo" >> "$todo".new
-       mv -f "$todo".new "$todo"
-       new_count=$(( $(git stripspace --strip-comments <"$done" | wc -l) ))
-       echo $new_count >"$msgnum"
-       total=$(($new_count + $(git stripspace --strip-comments <"$todo" | wc -l)))
-       echo $total >"$end"
-       if test "$last_count" != "$new_count"
-       then
-               last_count=$new_count
-               eval_gettext "Rebasing (\$new_count/\$total)"; printf "\r"
-               test -z "$verbose" || echo
-       fi
-}
-
-# Put the last action marked done at the beginning of the todo list
-# again. If there has not been an action marked done yet, leave the list of
-# items on the todo list unchanged.
-reschedule_last_action () {
-       tail -n 1 "$done" | cat - "$todo" >"$todo".new
-       sed -e \$d <"$done" >"$done".new
-       mv -f "$todo".new "$todo"
-       mv -f "$done".new "$done"
-}
-
 append_todo_help () {
        gettext "
 Commands:
-p, pick = use commit
-r, reword = use commit, but edit the commit message
-e, edit = use commit, but stop for amending
-s, squash = use commit, but meld into previous commit
-f, fixup = like \"squash\", but discard this commit's log message
-x, exec = run command (the rest of the line) using shell
-d, drop = remove commit
+p, pick <commit> = use commit
+r, reword <commit> = use commit, but edit the commit message
+e, edit <commit> = use commit, but stop for amending
+s, squash <commit> = use commit, but meld into previous commit
+f, fixup <commit> = like \"squash\", but discard this commit's log message
+x, exec <command> = run command (the rest of the line) using shell
+d, drop <commit> = remove commit
+l, label <label> = label current HEAD with a name
+t, reset <label> = reset HEAD to a label
+m, merge [-C <commit> | -c <commit>] <label> [# <oneline>]
+.       create a merge commit using the original merge commit's
+.       message (or the oneline, if no original merge commit was
+.       specified). Use -c <commit> to reword the commit message.
 
 These lines can be re-ordered; they are executed from top to bottom.
 " | git stripspace --comment-lines >>"$todo"
@@ -178,50 +71,6 @@ If you remove a line here THAT COMMIT WILL BE LOST.
        fi
 }
 
-make_patch () {
-       sha1_and_parents="$(git rev-list --parents -1 "$1")"
-       case "$sha1_and_parents" in
-       ?*' '?*' '?*)
-               git diff --cc $sha1_and_parents
-               ;;
-       ?*' '?*)
-               git diff-tree -p "$1^!"
-               ;;
-       *)
-               echo "Root commit"
-               ;;
-       esac > "$state_dir"/patch
-       test -f "$msg" ||
-               commit_message "$1" > "$msg"
-       test -f "$author_script" ||
-               get_author_ident_from_commit "$1" > "$author_script"
-}
-
-die_with_patch () {
-       echo "$1" > "$state_dir"/stopped-sha
-       git update-ref REBASE_HEAD "$1"
-       make_patch "$1"
-       die "$2"
-}
-
-exit_with_patch () {
-       echo "$1" > "$state_dir"/stopped-sha
-       git update-ref REBASE_HEAD "$1"
-       make_patch $1
-       git rev-parse --verify HEAD > "$amend"
-       gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
-       warn "$(eval_gettext "\
-You can amend the commit now, with
-
-       git commit --amend \$gpg_sign_opt_quoted
-
-Once you are satisfied with your changes, run
-
-       git rebase --continue")"
-       warn
-       exit $2
-}
-
 die_abort () {
        apply_autostash
        rm -rf "$state_dir"
@@ -232,30 +81,6 @@ has_action () {
        test -n "$(git stripspace --strip-comments <"$1")"
 }
 
-is_empty_commit() {
-       tree=$(git rev-parse -q --verify "$1"^{tree} 2>/dev/null) || {
-               sha1=$1
-               die "$(eval_gettext "\$sha1: not a commit that can be picked")"
-       }
-       ptree=$(git rev-parse -q --verify "$1"^^{tree} 2>/dev/null) ||
-               ptree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
-       test "$tree" = "$ptree"
-}
-
-is_merge_commit()
-{
-       git rev-parse --verify --quiet "$1"^2 >/dev/null 2>&1
-}
-
-# Run command with GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
-# GIT_AUTHOR_DATE exported from the current environment.
-do_with_author () {
-       (
-               export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE
-               "$@"
-       )
-}
-
 git_sequence_editor () {
        if test -z "$GIT_SEQUENCE_EDITOR"
        then
@@ -269,458 +94,6 @@ git_sequence_editor () {
        eval "$GIT_SEQUENCE_EDITOR" '"$@"'
 }
 
-pick_one () {
-       ff=--ff
-
-       case "$1" in -n) sha1=$2; ff= ;; *) sha1=$1 ;; esac
-       case "$force_rebase" in '') ;; ?*) ff= ;; esac
-       output git rev-parse --verify $sha1 || die "$(eval_gettext "Invalid commit name: \$sha1")"
-
-       if is_empty_commit "$sha1"
-       then
-               empty_args="--allow-empty"
-       fi
-
-       test -d "$rewritten" &&
-               pick_one_preserving_merges "$@" && return
-       output eval git cherry-pick $allow_rerere_autoupdate $allow_empty_message \
-                       ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
-                       "$strategy_args" $empty_args $ff "$@"
-
-       # If cherry-pick dies it leaves the to-be-picked commit unrecorded. Reschedule
-       # previous task so this commit is not lost.
-       ret=$?
-       case "$ret" in [01]) ;; *) reschedule_last_action ;; esac
-       return $ret
-}
-
-pick_one_preserving_merges () {
-       fast_forward=t
-       case "$1" in
-       -n)
-               fast_forward=f
-               sha1=$2
-               ;;
-       *)
-               sha1=$1
-               ;;
-       esac
-       sha1=$(git rev-parse $sha1)
-
-       if test -f "$state_dir"/current-commit
-       then
-               if test "$fast_forward" = t
-               then
-                       while read current_commit
-                       do
-                               git rev-parse HEAD > "$rewritten"/$current_commit
-                       done <"$state_dir"/current-commit
-                       rm "$state_dir"/current-commit ||
-                               die "$(gettext "Cannot write current commit's replacement sha1")"
-               fi
-       fi
-
-       echo $sha1 >> "$state_dir"/current-commit
-
-       # rewrite parents; if none were rewritten, we can fast-forward.
-       new_parents=
-       pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
-       if test "$pend" = " "
-       then
-               pend=" root"
-       fi
-       while [ "$pend" != "" ]
-       do
-               p=$(expr "$pend" : ' \([^ ]*\)')
-               pend="${pend# $p}"
-
-               if test -f "$rewritten"/$p
-               then
-                       new_p=$(cat "$rewritten"/$p)
-
-                       # If the todo reordered commits, and our parent is marked for
-                       # rewriting, but hasn't been gotten to yet, assume the user meant to
-                       # drop it on top of the current HEAD
-                       if test -z "$new_p"
-                       then
-                               new_p=$(git rev-parse HEAD)
-                       fi
-
-                       test $p != $new_p && fast_forward=f
-                       case "$new_parents" in
-                       *$new_p*)
-                               ;; # do nothing; that parent is already there
-                       *)
-                               new_parents="$new_parents $new_p"
-                               ;;
-                       esac
-               else
-                       if test -f "$dropped"/$p
-                       then
-                               fast_forward=f
-                               replacement="$(cat "$dropped"/$p)"
-                               test -z "$replacement" && replacement=root
-                               pend=" $replacement$pend"
-                       else
-                               new_parents="$new_parents $p"
-                       fi
-               fi
-       done
-       case $fast_forward in
-       t)
-               output warn "$(eval_gettext "Fast-forward to \$sha1")"
-               output git reset --hard $sha1 ||
-                       die "$(eval_gettext "Cannot fast-forward to \$sha1")"
-               ;;
-       f)
-               first_parent=$(expr "$new_parents" : ' \([^ ]*\)')
-
-               if [ "$1" != "-n" ]
-               then
-                       # detach HEAD to current parent
-                       output git checkout $first_parent 2> /dev/null ||
-                               die "$(eval_gettext "Cannot move HEAD to \$first_parent")"
-               fi
-
-               case "$new_parents" in
-               ' '*' '*)
-                       test "a$1" = a-n && die "$(eval_gettext "Refusing to squash a merge: \$sha1")"
-
-                       # redo merge
-                       author_script_content=$(get_author_ident_from_commit $sha1)
-                       eval "$author_script_content"
-                       msg_content="$(commit_message $sha1)"
-                       # No point in merging the first parent, that's HEAD
-                       new_parents=${new_parents# $first_parent}
-                       merge_args="--no-log --no-ff"
-                       if ! do_with_author output eval \
-                               git merge ${gpg_sign_opt:+$(git rev-parse \
-                                       --sq-quote "$gpg_sign_opt")} \
-                               $allow_rerere_autoupdate "$merge_args" \
-                               "$strategy_args" \
-                               -m "$(git rev-parse --sq-quote "$msg_content")" \
-                               "$new_parents"
-                       then
-                               printf "%s\n" "$msg_content" > "$GIT_DIR"/MERGE_MSG
-                               die_with_patch $sha1 "$(eval_gettext "Error redoing merge \$sha1")"
-                       fi
-                       echo "$sha1 $(git rev-parse HEAD^0)" >> "$rewritten_list"
-                       ;;
-               *)
-                       output eval git cherry-pick $allow_rerere_autoupdate \
-                               $allow_empty_message \
-                               ${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")} \
-                               "$strategy_args" "$@" ||
-                               die_with_patch $sha1 "$(eval_gettext "Could not pick \$sha1")"
-                       ;;
-               esac
-               ;;
-       esac
-}
-
-this_nth_commit_message () {
-       n=$1
-       eval_gettext "This is the commit message #\${n}:"
-}
-
-skip_nth_commit_message () {
-       n=$1
-       eval_gettext "The commit message #\${n} will be skipped:"
-}
-
-update_squash_messages () {
-       if test -f "$squash_msg"; then
-               mv "$squash_msg" "$squash_msg".bak || exit
-               count=$(($(sed -n \
-                       -e "1s/^$comment_char[^0-9]*\([0-9][0-9]*\).*/\1/p" \
-                       -e "q" < "$squash_msg".bak)+1))
-               {
-                       printf '%s\n' "$comment_char $(eval_ngettext \
-                               "This is a combination of \$count commit." \
-                               "This is a combination of \$count commits." \
-                               $count)"
-                       sed -e 1d -e '2,/^./{
-                               /^$/d
-                       }' <"$squash_msg".bak
-               } >"$squash_msg"
-       else
-               commit_message HEAD >"$fixup_msg" ||
-               die "$(eval_gettext "Cannot write \$fixup_msg")"
-               count=2
-               {
-                       printf '%s\n' "$comment_char $(gettext "This is a combination of 2 commits.")"
-                       printf '%s\n' "$comment_char $(gettext "This is the 1st commit message:")"
-                       echo
-                       cat "$fixup_msg"
-               } >"$squash_msg"
-       fi
-       case $1 in
-       squash)
-               rm -f "$fixup_msg"
-               echo
-               printf '%s\n' "$comment_char $(this_nth_commit_message $count)"
-               echo
-               commit_message $2
-               ;;
-       fixup)
-               echo
-               printf '%s\n' "$comment_char $(skip_nth_commit_message $count)"
-               echo
-               # Change the space after the comment character to TAB:
-               commit_message $2 | git stripspace --comment-lines | sed -e 's/ /       /'
-               ;;
-       esac >>"$squash_msg"
-}
-
-peek_next_command () {
-       git stripspace --strip-comments <"$todo" | sed -n -e 's/ .*//p' -e q
-}
-
-# A squash/fixup has failed.  Prepare the long version of the squash
-# commit message, then die_with_patch.  This code path requires the
-# user to edit the combined commit message for all commits that have
-# been squashed/fixedup so far.  So also erase the old squash
-# messages, effectively causing the combined commit to be used as the
-# new basis for any further squash/fixups.  Args: sha1 rest
-die_failed_squash() {
-       sha1=$1
-       rest=$2
-       mv "$squash_msg" "$msg" || exit
-       rm -f "$fixup_msg"
-       cp "$msg" "$GIT_DIR"/MERGE_MSG || exit
-       warn
-       warn "$(eval_gettext "Could not apply \$sha1... \$rest")"
-       die_with_patch $sha1 ""
-}
-
-flush_rewritten_pending() {
-       test -s "$rewritten_pending" || return
-       newsha1="$(git rev-parse HEAD^0)"
-       sed "s/$/ $newsha1/" < "$rewritten_pending" >> "$rewritten_list"
-       rm -f "$rewritten_pending"
-}
-
-record_in_rewritten() {
-       oldsha1="$(git rev-parse $1)"
-       echo "$oldsha1" >> "$rewritten_pending"
-
-       case "$(peek_next_command)" in
-       squash|s|fixup|f)
-               ;;
-       *)
-               flush_rewritten_pending
-               ;;
-       esac
-}
-
-do_pick () {
-       sha1=$1
-       rest=$2
-       if test "$(git rev-parse HEAD)" = "$squash_onto"
-       then
-               # Set the correct commit message and author info on the
-               # sentinel root before cherry-picking the original changes
-               # without committing (-n).  Finally, update the sentinel again
-               # to include these changes.  If the cherry-pick results in a
-               # conflict, this means our behaviour is similar to a standard
-               # failed cherry-pick during rebase, with a dirty index to
-               # resolve before manually running git commit --amend then git
-               # rebase --continue.
-               git commit --allow-empty --allow-empty-message --amend \
-                          --no-post-rewrite -n -q -C $sha1 &&
-                       pick_one -n $sha1 &&
-                       git commit --allow-empty --allow-empty-message \
-                                  --amend --no-post-rewrite -n -q -C $sha1 \
-                                  ${gpg_sign_opt:+"$gpg_sign_opt"} ||
-                                  die_with_patch $sha1 "$(eval_gettext "Could not apply \$sha1... \$rest")"
-       else
-               pick_one $sha1 ||
-                       die_with_patch $sha1 "$(eval_gettext "Could not apply \$sha1... \$rest")"
-       fi
-}
-
-do_next () {
-       rm -f "$msg" "$author_script" "$amend" "$state_dir"/stopped-sha || exit
-       read -r command sha1 rest < "$todo"
-       case "$command" in
-       "$comment_char"*|''|noop|drop|d)
-               mark_action_done
-               ;;
-       "$cr")
-               # Work around CR left by "read" (e.g. with Git for Windows' Bash).
-               mark_action_done
-               ;;
-       pick|p)
-               comment_for_reflog pick
-
-               mark_action_done
-               do_pick $sha1 "$rest"
-               record_in_rewritten $sha1
-               ;;
-       reword|r)
-               comment_for_reflog reword
-
-               mark_action_done
-               do_pick $sha1 "$rest"
-               git commit --amend --no-post-rewrite ${gpg_sign_opt:+"$gpg_sign_opt"} \
-                       $allow_empty_message || {
-                       warn "$(eval_gettext "\
-Could not amend commit after successfully picking \$sha1... \$rest
-This is most likely due to an empty commit message, or the pre-commit hook
-failed. If the pre-commit hook failed, you may need to resolve the issue before
-you are able to reword the commit.")"
-                       exit_with_patch $sha1 1
-               }
-               record_in_rewritten $sha1
-               ;;
-       edit|e)
-               comment_for_reflog edit
-
-               mark_action_done
-               do_pick $sha1 "$rest"
-               sha1_abbrev=$(git rev-parse --short $sha1)
-               warn "$(eval_gettext "Stopped at \$sha1_abbrev... \$rest")"
-               exit_with_patch $sha1 0
-               ;;
-       squash|s|fixup|f)
-               case "$command" in
-               squash|s)
-                       squash_style=squash
-                       ;;
-               fixup|f)
-                       squash_style=fixup
-                       ;;
-               esac
-               comment_for_reflog $squash_style
-
-               test -f "$done" && has_action "$done" ||
-                       die "$(eval_gettext "Cannot '\$squash_style' without a previous commit")"
-
-               mark_action_done
-               update_squash_messages $squash_style $sha1
-               author_script_content=$(get_author_ident_from_commit HEAD)
-               echo "$author_script_content" > "$author_script"
-               eval "$author_script_content"
-               if ! pick_one -n $sha1
-               then
-                       git rev-parse --verify HEAD >"$amend"
-                       die_failed_squash $sha1 "$rest"
-               fi
-               case "$(peek_next_command)" in
-               squash|s|fixup|f)
-                       # This is an intermediate commit; its message will only be
-                       # used in case of trouble.  So use the long version:
-                       do_with_author output git commit --amend --no-verify -F "$squash_msg" \
-                               ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                               die_failed_squash $sha1 "$rest"
-                       ;;
-               *)
-                       # This is the final command of this squash/fixup group
-                       if test -f "$fixup_msg"
-                       then
-                               do_with_author git commit --amend --no-verify -F "$fixup_msg" \
-                                       ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                                       die_failed_squash $sha1 "$rest"
-                       else
-                               cp "$squash_msg" "$GIT_DIR"/SQUASH_MSG || exit
-                               rm -f "$GIT_DIR"/MERGE_MSG
-                               do_with_author git commit --amend --no-verify -F "$GIT_DIR"/SQUASH_MSG -e \
-                                       ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                                       die_failed_squash $sha1 "$rest"
-                       fi
-                       rm -f "$squash_msg" "$fixup_msg"
-                       ;;
-               esac
-               record_in_rewritten $sha1
-               ;;
-       x|"exec")
-               read -r command rest < "$todo"
-               mark_action_done
-               eval_gettextln "Executing: \$rest"
-               "${SHELL:-@SHELL_PATH@}" -c "$rest" # Actual execution
-               status=$?
-               # Run in subshell because require_clean_work_tree can die.
-               dirty=f
-               (require_clean_work_tree "rebase" 2>/dev/null) || dirty=t
-               if test "$status" -ne 0
-               then
-                       warn "$(eval_gettext "Execution failed: \$rest")"
-                       test "$dirty" = f ||
-                               warn "$(gettext "and made changes to the index and/or the working tree")"
-
-                       warn "$(gettext "\
-You can fix the problem, and then run
-
-       git rebase --continue")"
-                       warn
-                       if test $status -eq 127         # command not found
-                       then
-                               status=1
-                       fi
-                       exit "$status"
-               elif test "$dirty" = t
-               then
-                       # TRANSLATORS: after these lines is a command to be issued by the user
-                       warn "$(eval_gettext "\
-Execution succeeded: \$rest
-but left changes to the index and/or the working tree
-Commit or stash your changes, and then run
-
-       git rebase --continue")"
-                       warn
-                       exit 1
-               fi
-               ;;
-       *)
-               warn "$(eval_gettext "Unknown command: \$command \$sha1 \$rest")"
-               fixtodo="$(gettext "Please fix this using 'git rebase --edit-todo'.")"
-               if git rev-parse --verify -q "$sha1" >/dev/null
-               then
-                       die_with_patch $sha1 "$fixtodo"
-               else
-                       die "$fixtodo"
-               fi
-               ;;
-       esac
-       test -s "$todo" && return
-
-       comment_for_reflog finish &&
-       newhead=$(git rev-parse HEAD) &&
-       case $head_name in
-       refs/*)
-               message="$GIT_REFLOG_ACTION: $head_name onto $onto" &&
-               git update-ref -m "$message" $head_name $newhead $orig_head &&
-               git symbolic-ref \
-                 -m "$GIT_REFLOG_ACTION: returning to $head_name" \
-                 HEAD $head_name
-               ;;
-       esac && {
-               test ! -f "$state_dir"/verbose ||
-                       git diff-tree --stat $orig_head..HEAD
-       } &&
-       {
-               test -s "$rewritten_list" &&
-               git notes copy --for-rewrite=rebase < "$rewritten_list" ||
-               true # we don't care if this copying failed
-       } &&
-       hook="$(git rev-parse --git-path hooks/post-rewrite)"
-       if test -x "$hook" && test -s "$rewritten_list"; then
-               "$hook" rebase < "$rewritten_list"
-               true # we don't care if this hook failed
-       fi &&
-               warn "$(eval_gettext "Successfully rebased and updated \$head_name.")"
-
-       return 1 # not failure; just to break the do_rest loop
-}
-
-# can only return 0, when the infinite loop breaks
-do_rest () {
-       while :
-       do
-               do_next || break
-       done
-}
-
 expand_todo_ids() {
        git rebase--helper --expand-ids
 }
@@ -743,242 +116,102 @@ get_missing_commit_check_level () {
        printf '%s' "$check_level" | tr 'A-Z' 'a-z'
 }
 
-# The whole contents of this file is run by dot-sourcing it from
-# inside a shell function.  It used to be that "return"s we see
-# below were not inside any function, and expected to return
-# to the function that dot-sourced us.
+# Initiate an action. If the cannot be any
+# further action it  may exec a command
+# or exit and not return.
 #
-# However, older (9.x) versions of FreeBSD /bin/sh misbehave on such a
-# construct and continue to run the statements that follow such a "return".
-# As a work-around, we introduce an extra layer of a function
-# here, and immediately call it after defining it.
-git_rebase__interactive () {
-
-case "$action" in
-continue)
-       if test ! -d "$rewritten"
-       then
+# TODO: Consider a cleaner return model so it
+# never exits and always return 0 if process
+# is complete.
+#
+# Parameter 1 is the action to initiate.
+#
+# Returns 0 if the action was able to complete
+# and if 1 if further processing is required.
+initiate_action () {
+       case "$1" in
+       continue)
                exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
-                       --continue
-       fi
-       # do we have anything to commit?
-       if git diff-index --cached --quiet HEAD --
-       then
-               # Nothing to commit -- skip this commit
-
-               test ! -f "$GIT_DIR"/CHERRY_PICK_HEAD ||
-               rm "$GIT_DIR"/CHERRY_PICK_HEAD ||
-               die "$(gettext "Could not remove CHERRY_PICK_HEAD")"
-       else
-               if ! test -f "$author_script"
-               then
-                       gpg_sign_opt_quoted=${gpg_sign_opt:+$(git rev-parse --sq-quote "$gpg_sign_opt")}
-                       die "$(eval_gettext "\
-You have staged changes in your working tree.
-If these changes are meant to be
-squashed into the previous commit, run:
-
-  git commit --amend \$gpg_sign_opt_quoted
-
-If they are meant to go into a new commit, run:
-
-  git commit \$gpg_sign_opt_quoted
-
-In both cases, once you're done, continue with:
-
-  git rebase --continue
-")"
-               fi
-               . "$author_script" ||
-                       die "$(gettext "Error trying to find the author identity to amend commit")"
-               if test -f "$amend"
-               then
-                       current_head=$(git rev-parse --verify HEAD)
-                       test "$current_head" = $(cat "$amend") ||
-                       die "$(gettext "\
-You have uncommitted changes in your working tree. Please commit them
-first and then run 'git rebase --continue' again.")"
-                       do_with_author git commit --amend --no-verify -F "$msg" -e \
-                               ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                               die "$(gettext "Could not commit staged changes.")"
-               else
-                       do_with_author git commit --no-verify -F "$msg" -e \
-                               ${gpg_sign_opt:+"$gpg_sign_opt"} $allow_empty_message ||
-                               die "$(gettext "Could not commit staged changes.")"
-               fi
-       fi
-
-       if test -r "$state_dir"/stopped-sha
-       then
-               record_in_rewritten "$(cat "$state_dir"/stopped-sha)"
-       fi
-
-       require_clean_work_tree "rebase"
-       do_rest
-       return 0
-       ;;
-skip)
-       git rerere clear
-
-       if test ! -d "$rewritten"
-       then
+                    --continue
+               ;;
+       skip)
+               git rerere clear
                exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
-                       --continue
-       fi
-       do_rest
-       return 0
-       ;;
-edit-todo)
-       git stripspace --strip-comments <"$todo" >"$todo".new
-       mv -f "$todo".new "$todo"
-       collapse_todo_ids
-       append_todo_help
-       gettext "
+                    --continue
+               ;;
+       edit-todo)
+               git stripspace --strip-comments <"$todo" >"$todo".new
+               mv -f "$todo".new "$todo"
+               collapse_todo_ids
+               append_todo_help
+               gettext "
 You are editing the todo file of an ongoing interactive rebase.
 To continue rebase after editing, run:
     git rebase --continue
 
 " | git stripspace --comment-lines >>"$todo"
 
-       git_sequence_editor "$todo" ||
-               die "$(gettext "Could not execute editor")"
-       expand_todo_ids
+               git_sequence_editor "$todo" ||
+                       die "$(gettext "Could not execute editor")"
+               expand_todo_ids
 
-       exit
-       ;;
-show-current-patch)
-       exec git show REBASE_HEAD --
-       ;;
-esac
+               exit
+               ;;
+       show-current-patch)
+               exec git show REBASE_HEAD --
+               ;;
+       *)
+               return 1 # continue
+               ;;
+       esac
+}
 
-comment_for_reflog start
+setup_reflog_action () {
+       comment_for_reflog start
 
-if test ! -z "$switch_to"
-then
-       GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
-       output git checkout "$switch_to" -- ||
-               die "$(eval_gettext "Could not checkout \$switch_to")"
+       if test ! -z "$switch_to"
+       then
+               GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
+               output git checkout "$switch_to" -- ||
+                       die "$(eval_gettext "Could not checkout \$switch_to")"
 
-       comment_for_reflog start
-fi
+               comment_for_reflog start
+       fi
+}
+
+init_basic_state () {
+       orig_head=$(git rev-parse --verify HEAD) || die "$(gettext "No HEAD?")"
+       mkdir -p "$state_dir" || die "$(eval_gettext "Could not create temporary \$state_dir")"
+       rm -f "$(git rev-parse --git-path REBASE_HEAD)"
 
-orig_head=$(git rev-parse --verify HEAD) || die "$(gettext "No HEAD?")"
-mkdir -p "$state_dir" || die "$(eval_gettext "Could not create temporary \$state_dir")"
-rm -f "$(git rev-parse --git-path REBASE_HEAD)"
+       : > "$state_dir"/interactive || die "$(gettext "Could not mark as interactive")"
+       write_basic_state
+}
 
-: > "$state_dir"/interactive || die "$(gettext "Could not mark as interactive")"
-write_basic_state
-if test t = "$preserve_merges"
-then
+init_revisions_and_shortrevisions () {
+       shorthead=$(git rev-parse --short $orig_head)
+       shortonto=$(git rev-parse --short $onto)
        if test -z "$rebase_root"
+               # this is now equivalent to ! -z "$upstream"
        then
-               mkdir "$rewritten" &&
-               for c in $(git merge-base --all $orig_head $upstream)
-               do
-                       echo $onto > "$rewritten"/$c ||
-                               die "$(gettext "Could not init rewritten commits")"
-               done
+               shortupstream=$(git rev-parse --short $upstream)
+               revisions=$upstream...$orig_head
+               shortrevisions=$shortupstream..$shorthead
        else
-               mkdir "$rewritten" &&
-               echo $onto > "$rewritten"/root ||
-                       die "$(gettext "Could not init rewritten commits")"
+               revisions=$onto...$orig_head
+               shortrevisions=$shorthead
+               test -z "$squash_onto" ||
+               echo "$squash_onto" >"$state_dir"/squash-onto
        fi
-       # No cherry-pick because our first pass is to determine
-       # parents to rewrite and skipping dropped commits would
-       # prematurely end our probe
-       merges_option=
-else
-       merges_option="--no-merges --cherry-pick"
-fi
-
-shorthead=$(git rev-parse --short $orig_head)
-shortonto=$(git rev-parse --short $onto)
-if test -z "$rebase_root"
-       # this is now equivalent to ! -z "$upstream"
-then
-       shortupstream=$(git rev-parse --short $upstream)
-       revisions=$upstream...$orig_head
-       shortrevisions=$shortupstream..$shorthead
-else
-       revisions=$onto...$orig_head
-       shortrevisions=$shorthead
-fi
-if test t != "$preserve_merges"
-then
-       git rebase--helper --make-script ${keep_empty:+--keep-empty} \
-               $revisions ${restrict_revision+^$restrict_revision} >"$todo" ||
-       die "$(gettext "Could not generate todo list")"
-else
-       format=$(git config --get rebase.instructionFormat)
-       # the 'rev-list .. | sed' requires %m to parse; the instruction requires %H to parse
-       git rev-list $merges_option --format="%m%H ${format:-%s}" \
-               --reverse --left-right --topo-order \
-               $revisions ${restrict_revision+^$restrict_revision} | \
-               sed -n "s/^>//p" |
-       while read -r sha1 rest
-       do
-
-               if test -z "$keep_empty" && is_empty_commit $sha1 && ! is_merge_commit $sha1
-               then
-                       comment_out="$comment_char "
-               else
-                       comment_out=
-               fi
-
-               if test -z "$rebase_root"
-               then
-                       preserve=t
-                       for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
-                       do
-                               if test -f "$rewritten"/$p
-                               then
-                                       preserve=f
-                               fi
-                       done
-               else
-                       preserve=f
-               fi
-               if test f = "$preserve"
-               then
-                       touch "$rewritten"/$sha1
-                       printf '%s\n' "${comment_out}pick $sha1 $rest" >>"$todo"
-               fi
-       done
-fi
-
-# Watch for commits that been dropped by --cherry-pick
-if test t = "$preserve_merges"
-then
-       mkdir "$dropped"
-       # Save all non-cherry-picked changes
-       git rev-list $revisions --left-right --cherry-pick | \
-               sed -n "s/^>//p" > "$state_dir"/not-cherry-picks
-       # Now all commits and note which ones are missing in
-       # not-cherry-picks and hence being dropped
-       git rev-list $revisions |
-       while read rev
-       do
-               if test -f "$rewritten"/$rev &&
-                  ! sane_grep "$rev" "$state_dir"/not-cherry-picks >/dev/null
-               then
-                       # Use -f2 because if rev-list is telling us this commit is
-                       # not worthwhile, we don't want to track its multiple heads,
-                       # just the history of its first-parent for others that will
-                       # be rebasing on top of it
-                       git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$dropped"/$rev
-                       sha1=$(git rev-list -1 $rev)
-                       sane_grep -v "^[a-z][a-z]* $sha1" <"$todo" > "${todo}2" ; mv "${todo}2" "$todo"
-                       rm "$rewritten"/$rev
-               fi
-       done
-fi
+}
 
-test -s "$todo" || echo noop >> "$todo"
-test -z "$autosquash" || git rebase--helper --rearrange-squash || exit
-test -n "$cmd" && git rebase--helper --add-exec-commands "$cmd"
+complete_action() {
+       test -s "$todo" || echo noop >> "$todo"
+       test -z "$autosquash" || git rebase--helper --rearrange-squash || exit
+       test -n "$cmd" && git rebase--helper --add-exec-commands "$cmd"
 
-todocount=$(git stripspace --strip-comments <"$todo" | wc -l)
-todocount=${todocount##* }
+       todocount=$(git stripspace --strip-comments <"$todo" | wc -l)
+       todocount=${todocount##* }
 
 cat >>"$todo" <<EOF
 
@@ -987,50 +220,64 @@ $comment_char $(eval_ngettext \
        "Rebase \$shortrevisions onto \$shortonto (\$todocount commands)" \
        "$todocount")
 EOF
-append_todo_help
-gettext "
-However, if you remove everything, the rebase will be aborted.
+       append_todo_help
+       gettext "
+       However, if you remove everything, the rebase will be aborted.
 
-" | git stripspace --comment-lines >>"$todo"
+       " | git stripspace --comment-lines >>"$todo"
 
-if test -z "$keep_empty"
-then
-       printf '%s\n' "$comment_char $(gettext "Note that empty commits are commented out")" >>"$todo"
-fi
+       if test -z "$keep_empty"
+       then
+               printf '%s\n' "$comment_char $(gettext "Note that empty commits are commented out")" >>"$todo"
+       fi
 
 
-has_action "$todo" ||
-       return 2
+       has_action "$todo" ||
+               return 2
 
-cp "$todo" "$todo".backup
-collapse_todo_ids
-git_sequence_editor "$todo" ||
-       die_abort "$(gettext "Could not execute editor")"
+       cp "$todo" "$todo".backup
+       collapse_todo_ids
+       git_sequence_editor "$todo" ||
+               die_abort "$(gettext "Could not execute editor")"
 
-has_action "$todo" ||
-       return 2
+       has_action "$todo" ||
+               return 2
 
-git rebase--helper --check-todo-list || {
-       ret=$?
-       checkout_onto
-       exit $ret
-}
+       git rebase--helper --check-todo-list || {
+               ret=$?
+               checkout_onto
+               exit $ret
+       }
 
-expand_todo_ids
+       expand_todo_ids
 
-test -d "$rewritten" || test -n "$force_rebase" ||
-onto="$(git rebase--helper --skip-unnecessary-picks)" ||
-die "Could not skip unnecessary pick commands"
+       test -n "$force_rebase" ||
+       onto="$(git rebase--helper --skip-unnecessary-picks)" ||
+       die "Could not skip unnecessary pick commands"
 
-checkout_onto
-if test -z "$rebase_root" && test ! -d "$rewritten"
-then
+       checkout_onto
        require_clean_work_tree "rebase"
        exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
-               --continue
-fi
-do_rest
+            --continue
+}
+
+git_rebase__interactive () {
+       initiate_action "$action"
+       ret=$?
+       if test $ret = 0; then
+               return 0
+       fi
+
+       setup_reflog_action
+       init_basic_state
+
+       init_revisions_and_shortrevisions
+
+       git rebase--helper --make-script ${keep_empty:+--keep-empty} \
+               ${rebase_merges:+--rebase-merges} \
+               ${rebase_cousins:+--rebase-cousins} \
+               $revisions ${restrict_revision+^$restrict_revision} >"$todo" ||
+       die "$(gettext "Could not generate todo list")"
 
+       complete_action
 }
-# ... and then we call the whole thing.
-git_rebase__interactive