[GSoC][PATCH v4 0/2] rebase -i: rewrite append_todo_help() in C

This patch rewrites append_todo_help() from shell to C. The C version covers a bit more than the old shell version. To achieve that, some parameters were added to rebase--helper.

This also introduce a new source file, rebase-interactive.c.

This is part of the effort to rewrite interactive rebase in C.

This is based on next, as of 2018-06-26.

Changes since v3:

 - Show an error message when append_todo_help() fails to edit the todo
   list.

 - Introducing rebase-interactive.c to contain functions necessary for
   interactive rebase.

Alban Gruin (2):
  sequencer: make two functions and an enum from sequencer.c public
  rebase--interactive: rewrite append_todo_help() in C

 Makefile                   |  1 +
 builtin/rebase--helper.c   | 11 ++++--
 git-rebase--interactive.sh | 52 ++---------------------------
 rebase-interactive.c       | 68 ++++++++++++++++++++++++++++++++++++++
 rebase-interactive.h       |  6 ++++
 sequencer.c                |  8 ++---
 sequencer.h                |  6 ++++
 7 files changed, 94 insertions(+), 58 deletions(-)
 create mode 100644 rebase-interactive.c
 create mode 100644 rebase-interactive.h