The extracted functions are:
  - initiate_action
  - setup_reflog_action
  - init_basic_state
  - init_revisions_and_shortrevisions
  - complete_action

Signed-off-by: Wink Saville <w...@saville.com>
---
 git-rebase--interactive.sh | 211 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 211 insertions(+)

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index a79330f45..b72f80ae8 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -740,6 +740,217 @@ get_missing_commit_check_level () {
        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 "$1" in
+       continue)
+               if test ! -d "$rewritten"
+               then
+                       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
+                       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 "$todo"
+               collapse_todo_ids
+               append_todo_help
+               gettext "
+You are editing the todo file of an ongoing interactive rebase.
+To continue rebase after editing, run:
+    git rebase --continue
+
+" | git stripspace --comment-lines >>"$todo"
+
+               git_sequence_editor "$todo" ||
+                       die "$(gettext "Could not execute editor")"
+               expand_todo_ids
+
+               exit
+               ;;
+       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
+       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
+       append_todo_help
+       gettext "
+       However, if you remove everything, the rebase will be aborted.
+
+       " | 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
+
+
+       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 $ret
+       }
+
+       expand_todo_ids
+
+       test -d "$rewritten" || 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
+               require_clean_work_tree "rebase"
+               exec git rebase--helper ${force_rebase:+--no-ff} 
$allow_empty_message \
+                       --continue
+       fi
+       do_rest
+}
+
 git_rebase__interactive () {
        case "$action" in
        continue)
-- 
2.16.2

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