# This shell script fragment is sourced by git-rebase to implement
# its interactive mode.  "git rebase --interactive" makes it easy
# to fix up commits in the middle of a series and rearrange commits.
#
# Copyright (c) 2006 Johannes E. Schindelin
#
# The original idea comes from Eric W. Biederman, in
# https://public-inbox.org/git/m1odwkyuf5.fsf_-_@ebiederm.dsl.xmission.com/
#
# The file containing rebase commands, comments, and empty lines.
# This file is created by "git rebase -i" then edited by the user.  As
# the lines are processed, they are removed from the front of this
# file and written to the tail of $done.
todo="$state_dir"/git-rebase-todo

GIT_CHERRY_PICK_HELP="$resolvemsg"
export GIT_CHERRY_PICK_HELP

comment_char=$(git config --get core.commentchar 2>/dev/null)
case "$comment_char" in
'' | auto)
        comment_char="#"
        ;;
?)
        ;;
*)
        comment_char=$(echo "$comment_char" | cut -c1)
        ;;
esac

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
}

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

has_action () {
        test -n "$(git stripspace --strip-comments <"$1")"
}

git_sequence_editor () {
        if test -z "$GIT_SEQUENCE_EDITOR"
        then
                GIT_SEQUENCE_EDITOR="$(git config sequence.editor)"
                if [ -z "$GIT_SEQUENCE_EDITOR" ]
                then
                        GIT_SEQUENCE_EDITOR="$(git var GIT_EDITOR)" || return $?
                fi
        fi

        eval "$GIT_SEQUENCE_EDITOR" '"$@"'
}

expand_todo_ids() {
        git rebase--helper --expand-ids
}

collapse_todo_ids() {
        git rebase--helper --shorten-ids
}

# Switch to the branch in $into and notify it in the reflog
checkout_onto () {
        GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name"
        output git checkout $onto || die_abort "$(gettext "could not detach HEAD")"
        git update-ref ORIG_HEAD $orig_head
}

get_missing_commit_check_level () {
        check_level=$(git config --get rebase.missingCommitsCheck)
        check_level=${check_level:-ignore}
        # Don't be case sensitive
        printf '%s' "$check_level" | tr 'A-Z' 'a-z'
}

# Initiate an action. If the cannot be any
# further action it  may exec a command
# or exit and not return.
#
# 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
                ;;
        skip)
                git rerere clear
                exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
                     --continue
                ;;
        edit-todo)
                exec git rebase--helper --edit-todo
                ;;
        show-current-patch)
                exec git show REBASE_HEAD --
                ;;
        *)
                return 1 # continue
                ;;
        esac
}

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")"

                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)"

        : > "$state_dir"/interactive || die "$(gettext "Could not mark as interactive")"
        write_basic_state
}

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 "$upstream"
        then
                shortupstream=$(git rev-parse --short $upstream)
                revisions=$upstream...$orig_head
                shortrevisions=$shortupstream..$shorthead
        else
                revisions=$onto...$orig_head
                shortrevisions=$shorthead
                test -z "$squash_onto" ||
                echo "$squash_onto" >"$state_dir"/squash-onto
        fi
}

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##* }

cat >>"$todo" <<EOF

$comment_char $(eval_ngettext \
        "Rebase \$shortrevisions onto \$shortonto (\$todocount command)" \
        "Rebase \$shortrevisions onto \$shortonto (\$todocount commands)" \
        "$todocount")
EOF
        git rebase--helper --append-todo-help ${keep_empty:+--keep-empty}

        has_action "$todo" ||
                return 2

        cp "$todo" "$todo".backup
        collapse_todo_ids
        git_sequence_editor "$todo" ||
                die_abort "$(gettext "Could not execute editor")"

        has_action "$todo" ||
                return 2

        git rebase--helper --check-todo-list || {
                ret=$?
                checkout_onto
                exit $ret
        }

        expand_todo_ids

        test -n "$force_rebase" ||
        onto="$(git rebase--helper --skip-unnecessary-picks)" ||
        die "Could not skip unnecessary pick commands"

        checkout_onto
        require_clean_work_tree "rebase"
        exec git rebase--helper ${force_rebase:+--no-ff} $allow_empty_message \
             --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
}