From: Phillip Wood <phillip.w...@dunelm.org.uk>

In order to run `rebase -i` without forking `rebase--interactive` it
will be convenient to have all the code from rebase--interactive.c in
rebase.c. This is a straight forward copy of the code from
rebase--interactive.c, it will be simplified slightly in the next
commit.

Signed-off-by: Phillip Wood <phillip.w...@dunelm.org.uk>
---
 Makefile                      |   1 -
 builtin/rebase--interactive.c | 377 ----------------------------------
 builtin/rebase.c              | 367 +++++++++++++++++++++++++++++++++
 3 files changed, 367 insertions(+), 378 deletions(-)
 delete mode 100644 builtin/rebase--interactive.c

diff --git a/Makefile b/Makefile
index 537493822b..c644089244 100644
--- a/Makefile
+++ b/Makefile
@@ -1130,7 +1130,6 @@ BUILTIN_OBJS += builtin/push.o
 BUILTIN_OBJS += builtin/range-diff.o
 BUILTIN_OBJS += builtin/read-tree.o
 BUILTIN_OBJS += builtin/rebase.o
-BUILTIN_OBJS += builtin/rebase--interactive.o
 BUILTIN_OBJS += builtin/receive-pack.o
 BUILTIN_OBJS += builtin/reflog.o
 BUILTIN_OBJS += builtin/remote.o
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
deleted file mode 100644
index d1a4ac1b84..0000000000
--- a/builtin/rebase--interactive.c
+++ /dev/null
@@ -1,377 +0,0 @@
-#define USE_THE_INDEX_COMPATIBILITY_MACROS
-#include "builtin.h"
-#include "cache.h"
-#include "config.h"
-#include "parse-options.h"
-#include "sequencer.h"
-#include "rebase-interactive.h"
-#include "argv-array.h"
-#include "refs.h"
-#include "rerere.h"
-#include "run-command.h"
-
-static GIT_PATH_FUNC(path_state_dir, "rebase-merge/")
-static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
-static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")
-
-static int add_exec_commands(struct string_list *commands)
-{
-       const char *todo_file = rebase_path_todo();
-       struct todo_list todo_list = TODO_LIST_INIT;
-       int res;
-
-       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-               return error_errno(_("could not read '%s'."), todo_file);
-
-       if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-                                       &todo_list)) {
-               todo_list_release(&todo_list);
-               return error(_("unusable todo list: '%s'"), todo_file);
-       }
-
-       todo_list_add_exec_commands(&todo_list, commands);
-       res = todo_list_write_to_file(the_repository, &todo_list,
-                                     todo_file, NULL, NULL, -1, 0);
-       todo_list_release(&todo_list);
-
-       if (res)
-               return error_errno(_("could not write '%s'."), todo_file);
-       return 0;
-}
-
-static int rearrange_squash_in_todo_file(void)
-{
-       const char *todo_file = rebase_path_todo();
-       struct todo_list todo_list = TODO_LIST_INIT;
-       int res = 0;
-
-       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-               return error_errno(_("could not read '%s'."), todo_file);
-       if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-                                       &todo_list)) {
-               todo_list_release(&todo_list);
-               return error(_("unusable todo list: '%s'"), todo_file);
-       }
-
-       res = todo_list_rearrange_squash(&todo_list);
-       if (!res)
-               res = todo_list_write_to_file(the_repository, &todo_list,
-                                             todo_file, NULL, NULL, -1, 0);
-
-       todo_list_release(&todo_list);
-
-       if (res)
-               return error_errno(_("could not write '%s'."), todo_file);
-       return 0;
-}
-
-static int transform_todo_file(unsigned flags)
-{
-       const char *todo_file = rebase_path_todo();
-       struct todo_list todo_list = TODO_LIST_INIT;
-       int res;
-
-       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-               return error_errno(_("could not read '%s'."), todo_file);
-
-       if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
-                                       &todo_list)) {
-               todo_list_release(&todo_list);
-               return error(_("unusable todo list: '%s'"), todo_file);
-       }
-
-       res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
-                                     NULL, NULL, -1, flags);
-       todo_list_release(&todo_list);
-
-       if (res)
-               return error_errno(_("could not write '%s'."), todo_file);
-       return 0;
-}
-
-static int edit_todo_file(unsigned flags)
-{
-       const char *todo_file = rebase_path_todo();
-       struct todo_list todo_list = TODO_LIST_INIT,
-               new_todo = TODO_LIST_INIT;
-       int res = 0;
-
-       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
-               return error_errno(_("could not read '%s'."), todo_file);
-
-       strbuf_stripspace(&todo_list.buf, 1);
-       res = edit_todo_list(the_repository, &todo_list, &new_todo, NULL, NULL, 
flags);
-       if (!res && todo_list_write_to_file(the_repository, &new_todo, 
todo_file,
-                                           NULL, NULL, -1, flags & 
~(TODO_LIST_SHORTEN_IDS)))
-               res = error_errno(_("could not write '%s'"), todo_file);
-
-       todo_list_release(&todo_list);
-       todo_list_release(&new_todo);
-
-       return res;
-}
-
-static int get_revision_ranges(const char *upstream, const char *onto,
-                              const char **head_hash,
-                              char **revisions, char **shortrevisions)
-{
-       const char *base_rev = upstream ? upstream : onto, *shorthead;
-       struct object_id orig_head;
-
-       if (get_oid("HEAD", &orig_head))
-               return error(_("no HEAD?"));
-
-       *head_hash = find_unique_abbrev(&orig_head, GIT_MAX_HEXSZ);
-       *revisions = xstrfmt("%s...%s", base_rev, *head_hash);
-
-       shorthead = find_unique_abbrev(&orig_head, DEFAULT_ABBREV);
-
-       if (upstream) {
-               const char *shortrev;
-               struct object_id rev_oid;
-
-               get_oid(base_rev, &rev_oid);
-               shortrev = find_unique_abbrev(&rev_oid, DEFAULT_ABBREV);
-
-               *shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
-       } else
-               *shortrevisions = xstrdup(shorthead);
-
-       return 0;
-}
-
-static int init_basic_state(struct replay_opts *opts, const char *head_name,
-                           const char *onto, const char *orig_head)
-{
-       FILE *interactive;
-
-       if (!is_directory(path_state_dir()) && 
mkdir_in_gitdir(path_state_dir()))
-               return error_errno(_("could not create temporary %s"), 
path_state_dir());
-
-       delete_reflog("REBASE_HEAD");
-
-       interactive = fopen(path_interactive(), "w");
-       if (!interactive)
-               return error_errno(_("could not mark as interactive"));
-       fclose(interactive);
-
-       return write_basic_state(opts, head_name, onto, orig_head);
-}
-
-static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
-                                const char *switch_to, const char *upstream,
-                                const char *onto, const char *onto_name,
-                                const char *squash_onto, const char *head_name,
-                                const char *restrict_revision, char 
*raw_strategies,
-                                struct string_list *commands, unsigned 
autosquash)
-{
-       int ret;
-       const char *head_hash = NULL;
-       char *revisions = NULL, *shortrevisions = NULL;
-       struct argv_array make_script_args = ARGV_ARRAY_INIT;
-       struct todo_list todo_list = TODO_LIST_INIT;
-
-       if (prepare_branch_to_be_rebased(the_repository, opts, switch_to))
-               return -1;
-
-       if (get_revision_ranges(upstream, onto, &head_hash,
-                               &revisions, &shortrevisions))
-               return -1;
-
-       if (raw_strategies)
-               parse_strategy_opts(opts, raw_strategies);
-
-       if (init_basic_state(opts, head_name, onto, head_hash)) {
-               free(revisions);
-               free(shortrevisions);
-
-               return -1;
-       }
-
-       if (!upstream && squash_onto)
-               write_file(path_squash_onto(), "%s\n", squash_onto);
-
-       argv_array_pushl(&make_script_args, "", revisions, NULL);
-       if (restrict_revision)
-               argv_array_push(&make_script_args, restrict_revision);
-
-       ret = sequencer_make_script(the_repository, &todo_list.buf,
-                                   make_script_args.argc, 
make_script_args.argv,
-                                   flags);
-
-       if (ret)
-               error(_("could not generate todo list"));
-       else {
-               discard_cache();
-               if (todo_list_parse_insn_buffer(the_repository, 
todo_list.buf.buf,
-                                               &todo_list))
-                       BUG("unusable todo list");
-
-               ret = complete_action(the_repository, opts, flags, 
shortrevisions, onto_name,
-                                     onto, head_hash, commands, autosquash, 
&todo_list);
-       }
-
-       free(revisions);
-       free(shortrevisions);
-       todo_list_release(&todo_list);
-       argv_array_clear(&make_script_args);
-
-       return ret;
-}
-
-static const char * const builtin_rebase_interactive_usage[] = {
-       N_("git rebase--interactive [<options>]"),
-       NULL
-};
-
-int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
-{
-       struct replay_opts opts = REPLAY_OPTS_INIT;
-       unsigned flags = 0, keep_empty = 0, rebase_merges = 0, autosquash = 0;
-       int abbreviate_commands = 0, rebase_cousins = -1, ret = 0;
-       const char *onto = NULL, *onto_name = NULL, *restrict_revision = NULL,
-               *squash_onto = NULL, *upstream = NULL, *head_name = NULL,
-               *switch_to = NULL, *cmd = NULL;
-       struct string_list commands = STRING_LIST_INIT_DUP;
-       char *raw_strategies = NULL;
-       enum {
-               NONE = 0, CONTINUE, SKIP, EDIT_TODO, SHOW_CURRENT_PATCH,
-               SHORTEN_OIDS, EXPAND_OIDS, CHECK_TODO_LIST, REARRANGE_SQUASH, 
ADD_EXEC
-       } command = 0;
-       struct option options[] = {
-               OPT_BOOL(0, "ff", &opts.allow_ff, N_("allow fast-forward")),
-               OPT_BOOL(0, "keep-empty", &keep_empty, N_("keep empty 
commits")),
-               OPT_BOOL(0, "allow-empty-message", &opts.allow_empty_message,
-                        N_("allow commits with empty messages")),
-               OPT_BOOL(0, "rebase-merges", &rebase_merges, N_("rebase merge 
commits")),
-               OPT_BOOL(0, "rebase-cousins", &rebase_cousins,
-                        N_("keep original branch points of cousins")),
-               OPT_BOOL(0, "autosquash", &autosquash,
-                        N_("move commits that begin with squash!/fixup!")),
-               OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
-               OPT__VERBOSE(&opts.verbose, N_("be verbose")),
-               OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
-                           CONTINUE),
-               OPT_CMDMODE(0, "skip", &command, N_("skip commit"), SKIP),
-               OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
-                           EDIT_TODO),
-               OPT_CMDMODE(0, "show-current-patch", &command, N_("show the 
current patch"),
-                           SHOW_CURRENT_PATCH),
-               OPT_CMDMODE(0, "shorten-ids", &command,
-                       N_("shorten commit ids in the todo list"), 
SHORTEN_OIDS),
-               OPT_CMDMODE(0, "expand-ids", &command,
-                       N_("expand commit ids in the todo list"), EXPAND_OIDS),
-               OPT_CMDMODE(0, "check-todo-list", &command,
-                       N_("check the todo list"), CHECK_TODO_LIST),
-               OPT_CMDMODE(0, "rearrange-squash", &command,
-                       N_("rearrange fixup/squash lines"), REARRANGE_SQUASH),
-               OPT_CMDMODE(0, "add-exec-commands", &command,
-                       N_("insert exec commands in todo list"), ADD_EXEC),
-               OPT_STRING(0, "onto", &onto, N_("onto"), N_("onto")),
-               OPT_STRING(0, "restrict-revision", &restrict_revision,
-                          N_("restrict-revision"), N_("restrict revision")),
-               OPT_STRING(0, "squash-onto", &squash_onto, N_("squash-onto"),
-                          N_("squash onto")),
-               OPT_STRING(0, "upstream", &upstream, N_("upstream"),
-                          N_("the upstream commit")),
-               OPT_STRING(0, "head-name", &head_name, N_("head-name"), 
N_("head name")),
-               { OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign, N_("key-id"),
-                       N_("GPG-sign commits"),
-                       PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-               OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
-                          N_("rebase strategy")),
-               OPT_STRING(0, "strategy-opts", &raw_strategies, 
N_("strategy-opts"),
-                          N_("strategy options")),
-               OPT_STRING(0, "switch-to", &switch_to, N_("switch-to"),
-                          N_("the branch or commit to checkout")),
-               OPT_STRING(0, "onto-name", &onto_name, N_("onto-name"), 
N_("onto name")),
-               OPT_STRING(0, "cmd", &cmd, N_("cmd"), N_("the command to run")),
-               OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_auto),
-               OPT_BOOL(0, "reschedule-failed-exec", 
&opts.reschedule_failed_exec,
-                        N_("automatically re-schedule any `exec` that fails")),
-               OPT_END()
-       };
-
-       sequencer_init_config(&opts);
-       git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
-
-       opts.action = REPLAY_INTERACTIVE_REBASE;
-       opts.allow_ff = 1;
-       opts.allow_empty = 1;
-
-       if (argc == 1)
-               usage_with_options(builtin_rebase_interactive_usage, options);
-
-       argc = parse_options(argc, argv, NULL, options,
-                       builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
-
-       opts.gpg_sign = xstrdup_or_null(opts.gpg_sign);
-
-       flags |= keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
-       flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
-       flags |= rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
-       flags |= rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
-       flags |= command == SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
-
-       if (rebase_cousins >= 0 && !rebase_merges)
-               warning(_("--[no-]rebase-cousins has no effect without "
-                         "--rebase-merges"));
-
-       if (cmd && *cmd) {
-               string_list_split(&commands, cmd, '\n', -1);
-
-               /* rebase.c adds a new line to cmd after every command,
-                * so here the last command is always empty */
-               string_list_remove_empty_items(&commands, 0);
-       }
-
-       switch (command) {
-       case NONE:
-               if (!onto && !upstream)
-                       die(_("a base commit must be provided with --upstream 
or --onto"));
-
-               ret = do_interactive_rebase(&opts, flags, switch_to, upstream, 
onto,
-                                           onto_name, squash_onto, head_name, 
restrict_revision,
-                                           raw_strategies, &commands, 
autosquash);
-               break;
-       case SKIP: {
-               struct string_list merge_rr = STRING_LIST_INIT_DUP;
-
-               rerere_clear(the_repository, &merge_rr);
-               /* fallthrough */
-       case CONTINUE:
-               ret = sequencer_continue(the_repository, &opts);
-               break;
-       }
-       case EDIT_TODO:
-               ret = edit_todo_file(flags);
-               break;
-       case SHOW_CURRENT_PATCH: {
-               struct child_process cmd = CHILD_PROCESS_INIT;
-
-               cmd.git_cmd = 1;
-               argv_array_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
-               ret = run_command(&cmd);
-
-               break;
-       }
-       case SHORTEN_OIDS:
-       case EXPAND_OIDS:
-               ret = transform_todo_file(flags);
-               break;
-       case CHECK_TODO_LIST:
-               ret = check_todo_list_from_file(the_repository);
-               break;
-       case REARRANGE_SQUASH:
-               ret = rearrange_squash_in_todo_file();
-               break;
-       case ADD_EXEC:
-               ret = add_exec_commands(&commands);
-               break;
-       default:
-               BUG("invalid command '%d'", command);
-       }
-
-       string_list_clear(&commands, 0);
-       return !!ret;
-}
diff --git a/builtin/rebase.c b/builtin/rebase.c
index ccf178326c..80252d72df 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -25,6 +25,8 @@
 #include "commit-reach.h"
 #include "rerere.h"
 #include "branch.h"
+#include "sequencer.h"
+#include "rebase-interactive.h"
 
 static char const * const builtin_rebase_usage[] = {
        N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
@@ -35,6 +37,9 @@ static char const * const builtin_rebase_usage[] = {
        NULL
 };
 
+static GIT_PATH_FUNC(path_state_dir, "rebase-merge/")
+static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
+static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")
 static GIT_PATH_FUNC(apply_dir, "rebase-apply")
 static GIT_PATH_FUNC(merge_dir, "rebase-merge")
 
@@ -46,6 +51,368 @@ enum rebase_type {
        REBASE_PRESERVE_MERGES
 };
 
+static int add_exec_commands(struct string_list *commands)
+{
+       const char *todo_file = rebase_path_todo();
+       struct todo_list todo_list = TODO_LIST_INIT;
+       int res;
+
+       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
+               return error_errno(_("could not read '%s'."), todo_file);
+
+       if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
+                                       &todo_list)) {
+               todo_list_release(&todo_list);
+               return error(_("unusable todo list: '%s'"), todo_file);
+       }
+
+       todo_list_add_exec_commands(&todo_list, commands);
+       res = todo_list_write_to_file(the_repository, &todo_list,
+                                     todo_file, NULL, NULL, -1, 0);
+       todo_list_release(&todo_list);
+
+       if (res)
+               return error_errno(_("could not write '%s'."), todo_file);
+       return 0;
+}
+
+static int rearrange_squash_in_todo_file(void)
+{
+       const char *todo_file = rebase_path_todo();
+       struct todo_list todo_list = TODO_LIST_INIT;
+       int res = 0;
+
+       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
+               return error_errno(_("could not read '%s'."), todo_file);
+       if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
+                                       &todo_list)) {
+               todo_list_release(&todo_list);
+               return error(_("unusable todo list: '%s'"), todo_file);
+       }
+
+       res = todo_list_rearrange_squash(&todo_list);
+       if (!res)
+               res = todo_list_write_to_file(the_repository, &todo_list,
+                                             todo_file, NULL, NULL, -1, 0);
+
+       todo_list_release(&todo_list);
+
+       if (res)
+               return error_errno(_("could not write '%s'."), todo_file);
+       return 0;
+}
+
+static int transform_todo_file(unsigned flags)
+{
+       const char *todo_file = rebase_path_todo();
+       struct todo_list todo_list = TODO_LIST_INIT;
+       int res;
+
+       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
+               return error_errno(_("could not read '%s'."), todo_file);
+
+       if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
+                                       &todo_list)) {
+               todo_list_release(&todo_list);
+               return error(_("unusable todo list: '%s'"), todo_file);
+       }
+
+       res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
+                                     NULL, NULL, -1, flags);
+       todo_list_release(&todo_list);
+
+       if (res)
+               return error_errno(_("could not write '%s'."), todo_file);
+       return 0;
+}
+
+static int edit_todo_file(unsigned flags)
+{
+       const char *todo_file = rebase_path_todo();
+       struct todo_list todo_list = TODO_LIST_INIT,
+               new_todo = TODO_LIST_INIT;
+       int res = 0;
+
+       if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
+               return error_errno(_("could not read '%s'."), todo_file);
+
+       strbuf_stripspace(&todo_list.buf, 1);
+       res = edit_todo_list(the_repository, &todo_list, &new_todo, NULL, NULL, 
flags);
+       if (!res && todo_list_write_to_file(the_repository, &new_todo, 
todo_file,
+                                           NULL, NULL, -1, flags & 
~(TODO_LIST_SHORTEN_IDS)))
+               res = error_errno(_("could not write '%s'"), todo_file);
+
+       todo_list_release(&todo_list);
+       todo_list_release(&new_todo);
+
+       return res;
+}
+
+static int get_revision_ranges(const char *upstream, const char *onto,
+                              const char **head_hash,
+                              char **revisions, char **shortrevisions)
+{
+       const char *base_rev = upstream ? upstream : onto, *shorthead;
+       struct object_id orig_head;
+
+       if (get_oid("HEAD", &orig_head))
+               return error(_("no HEAD?"));
+
+       *head_hash = find_unique_abbrev(&orig_head, GIT_MAX_HEXSZ);
+       *revisions = xstrfmt("%s...%s", base_rev, *head_hash);
+
+       shorthead = find_unique_abbrev(&orig_head, DEFAULT_ABBREV);
+
+       if (upstream) {
+               const char *shortrev;
+               struct object_id rev_oid;
+
+               get_oid(base_rev, &rev_oid);
+               shortrev = find_unique_abbrev(&rev_oid, DEFAULT_ABBREV);
+
+               *shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
+       } else
+               *shortrevisions = xstrdup(shorthead);
+
+       return 0;
+}
+
+static int init_basic_state(struct replay_opts *opts, const char *head_name,
+                           const char *onto, const char *orig_head)
+{
+       FILE *interactive;
+
+       if (!is_directory(path_state_dir()) && 
mkdir_in_gitdir(path_state_dir()))
+               return error_errno(_("could not create temporary %s"), 
path_state_dir());
+
+       delete_reflog("REBASE_HEAD");
+
+       interactive = fopen(path_interactive(), "w");
+       if (!interactive)
+               return error_errno(_("could not mark as interactive"));
+       fclose(interactive);
+
+       return write_basic_state(opts, head_name, onto, orig_head);
+}
+
+static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
+                                const char *switch_to, const char *upstream,
+                                const char *onto, const char *onto_name,
+                                const char *squash_onto, const char *head_name,
+                                const char *restrict_revision, char 
*raw_strategies,
+                                struct string_list *commands, unsigned 
autosquash)
+{
+       int ret;
+       const char *head_hash = NULL;
+       char *revisions = NULL, *shortrevisions = NULL;
+       struct argv_array make_script_args = ARGV_ARRAY_INIT;
+       struct todo_list todo_list = TODO_LIST_INIT;
+
+       if (prepare_branch_to_be_rebased(the_repository, opts, switch_to))
+               return -1;
+
+       if (get_revision_ranges(upstream, onto, &head_hash,
+                               &revisions, &shortrevisions))
+               return -1;
+
+       if (raw_strategies)
+               parse_strategy_opts(opts, raw_strategies);
+
+       if (init_basic_state(opts, head_name, onto, head_hash)) {
+               free(revisions);
+               free(shortrevisions);
+
+               return -1;
+       }
+
+       if (!upstream && squash_onto)
+               write_file(path_squash_onto(), "%s\n", squash_onto);
+
+       argv_array_pushl(&make_script_args, "", revisions, NULL);
+       if (restrict_revision)
+               argv_array_push(&make_script_args, restrict_revision);
+
+       ret = sequencer_make_script(the_repository, &todo_list.buf,
+                                   make_script_args.argc, 
make_script_args.argv,
+                                   flags);
+
+       if (ret)
+               error(_("could not generate todo list"));
+       else {
+               discard_cache();
+               if (todo_list_parse_insn_buffer(the_repository, 
todo_list.buf.buf,
+                                               &todo_list))
+                       BUG("unusable todo list");
+
+               ret = complete_action(the_repository, opts, flags, 
shortrevisions, onto_name,
+                                     onto, head_hash, commands, autosquash, 
&todo_list);
+       }
+
+       free(revisions);
+       free(shortrevisions);
+       todo_list_release(&todo_list);
+       argv_array_clear(&make_script_args);
+
+       return ret;
+}
+
+static const char * const builtin_rebase_interactive_usage[] = {
+       N_("git rebase--interactive [<options>]"),
+       NULL
+};
+
+int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
+{
+       struct replay_opts opts = REPLAY_OPTS_INIT;
+       unsigned flags = 0, keep_empty = 0, rebase_merges = 0, autosquash = 0;
+       int abbreviate_commands = 0, rebase_cousins = -1, ret = 0;
+       const char *onto = NULL, *onto_name = NULL, *restrict_revision = NULL,
+               *squash_onto = NULL, *upstream = NULL, *head_name = NULL,
+               *switch_to = NULL, *cmd = NULL;
+       struct string_list commands = STRING_LIST_INIT_DUP;
+       char *raw_strategies = NULL;
+       enum {
+               NONE = 0, CONTINUE, SKIP, EDIT_TODO, SHOW_CURRENT_PATCH,
+               SHORTEN_OIDS, EXPAND_OIDS, CHECK_TODO_LIST, REARRANGE_SQUASH, 
ADD_EXEC
+       } command = 0;
+       struct option options[] = {
+               OPT_BOOL(0, "ff", &opts.allow_ff, N_("allow fast-forward")),
+               OPT_BOOL(0, "keep-empty", &keep_empty, N_("keep empty 
commits")),
+               OPT_BOOL(0, "allow-empty-message", &opts.allow_empty_message,
+                        N_("allow commits with empty messages")),
+               OPT_BOOL(0, "rebase-merges", &rebase_merges, N_("rebase merge 
commits")),
+               OPT_BOOL(0, "rebase-cousins", &rebase_cousins,
+                        N_("keep original branch points of cousins")),
+               OPT_BOOL(0, "autosquash", &autosquash,
+                        N_("move commits that begin with squash!/fixup!")),
+               OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
+               OPT__VERBOSE(&opts.verbose, N_("be verbose")),
+               OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
+                           CONTINUE),
+               OPT_CMDMODE(0, "skip", &command, N_("skip commit"), SKIP),
+               OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
+                           EDIT_TODO),
+               OPT_CMDMODE(0, "show-current-patch", &command, N_("show the 
current patch"),
+                           SHOW_CURRENT_PATCH),
+               OPT_CMDMODE(0, "shorten-ids", &command,
+                       N_("shorten commit ids in the todo list"), 
SHORTEN_OIDS),
+               OPT_CMDMODE(0, "expand-ids", &command,
+                       N_("expand commit ids in the todo list"), EXPAND_OIDS),
+               OPT_CMDMODE(0, "check-todo-list", &command,
+                       N_("check the todo list"), CHECK_TODO_LIST),
+               OPT_CMDMODE(0, "rearrange-squash", &command,
+                       N_("rearrange fixup/squash lines"), REARRANGE_SQUASH),
+               OPT_CMDMODE(0, "add-exec-commands", &command,
+                       N_("insert exec commands in todo list"), ADD_EXEC),
+               OPT_STRING(0, "onto", &onto, N_("onto"), N_("onto")),
+               OPT_STRING(0, "restrict-revision", &restrict_revision,
+                          N_("restrict-revision"), N_("restrict revision")),
+               OPT_STRING(0, "squash-onto", &squash_onto, N_("squash-onto"),
+                          N_("squash onto")),
+               OPT_STRING(0, "upstream", &upstream, N_("upstream"),
+                          N_("the upstream commit")),
+               OPT_STRING(0, "head-name", &head_name, N_("head-name"), 
N_("head name")),
+               { OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign, N_("key-id"),
+                       N_("GPG-sign commits"),
+                       PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
+               OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
+                          N_("rebase strategy")),
+               OPT_STRING(0, "strategy-opts", &raw_strategies, 
N_("strategy-opts"),
+                          N_("strategy options")),
+               OPT_STRING(0, "switch-to", &switch_to, N_("switch-to"),
+                          N_("the branch or commit to checkout")),
+               OPT_STRING(0, "onto-name", &onto_name, N_("onto-name"), 
N_("onto name")),
+               OPT_STRING(0, "cmd", &cmd, N_("cmd"), N_("the command to run")),
+               OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_auto),
+               OPT_BOOL(0, "reschedule-failed-exec", 
&opts.reschedule_failed_exec,
+                        N_("automatically re-schedule any `exec` that fails")),
+               OPT_END()
+       };
+
+       sequencer_init_config(&opts);
+       git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
+
+       opts.action = REPLAY_INTERACTIVE_REBASE;
+       opts.allow_ff = 1;
+       opts.allow_empty = 1;
+
+       if (argc == 1)
+               usage_with_options(builtin_rebase_interactive_usage, options);
+
+       argc = parse_options(argc, argv, NULL, options,
+                       builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
+
+       opts.gpg_sign = xstrdup_or_null(opts.gpg_sign);
+
+       flags |= keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
+       flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
+       flags |= rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
+       flags |= rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
+       flags |= command == SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;
+
+       if (rebase_cousins >= 0 && !rebase_merges)
+               warning(_("--[no-]rebase-cousins has no effect without "
+                         "--rebase-merges"));
+
+       if (cmd && *cmd) {
+               string_list_split(&commands, cmd, '\n', -1);
+
+               /* rebase.c adds a new line to cmd after every command,
+                * so here the last command is always empty */
+               string_list_remove_empty_items(&commands, 0);
+       }
+
+       switch (command) {
+       case NONE:
+               if (!onto && !upstream)
+                       die(_("a base commit must be provided with --upstream 
or --onto"));
+
+               ret = do_interactive_rebase(&opts, flags, switch_to, upstream, 
onto,
+                                           onto_name, squash_onto, head_name, 
restrict_revision,
+                                           raw_strategies, &commands, 
autosquash);
+               break;
+       case SKIP: {
+               struct string_list merge_rr = STRING_LIST_INIT_DUP;
+
+               rerere_clear(the_repository, &merge_rr);
+               /* fallthrough */
+       case CONTINUE:
+               ret = sequencer_continue(the_repository, &opts);
+               break;
+       }
+       case EDIT_TODO:
+               ret = edit_todo_file(flags);
+               break;
+       case SHOW_CURRENT_PATCH: {
+               struct child_process cmd = CHILD_PROCESS_INIT;
+
+               cmd.git_cmd = 1;
+               argv_array_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
+               ret = run_command(&cmd);
+
+               break;
+       }
+       case SHORTEN_OIDS:
+       case EXPAND_OIDS:
+               ret = transform_todo_file(flags);
+               break;
+       case CHECK_TODO_LIST:
+               ret = check_todo_list_from_file(the_repository);
+               break;
+       case REARRANGE_SQUASH:
+               ret = rearrange_squash_in_todo_file();
+               break;
+       case ADD_EXEC:
+               ret = add_exec_commands(&commands);
+               break;
+       default:
+               BUG("invalid command '%d'", command);
+       }
+
+       string_list_clear(&commands, 0);
+       return !!ret;
+}
+
 static int use_builtin_rebase(void)
 {
        struct child_process cp = CHILD_PROCESS_INIT;
-- 
2.21.0

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