[GSoC] [PATCH 0/6] builtin rebase rest

This patch pretty much converts all what is remaining from the shell-script version of `git rebase` to the builtin version. After the conversion of actions and different options which are important for builtin rebase and have been organized to make a patch series of their own. There were still some leftover shell scripts on the original rebase and hence, this patch series addresses those by converting them and this completes the builtin rebase.

It adds the functionality to the previous patch series, (https://public-inbox.org/git/20180808152140.14585-1-predatoramigo@gmail.com/).

This is the fifth patch series that brings us more closer to a builtin "git rebase".

If you like to view the development branch, you can view (https://github.com/git/git/pull/505), where I have kept my commits up to date and leveraged Travis(there is sporadic failures in t5520 for macos gcc and isn't due to my patches) for extra testing other than my system.

The next in line patch series which I'll be sending out today are:

default to builtin rebase: This will turn on the feature-complete builtin rebase to on.

These patch series are built on top of each other, i.e. they depend on this order.

Pratik Karki (6):
  builtin rebase: optionally auto-detect the upstream
  builtin rebase: optionally pass custom reflogs to reset_head()
  builtin rebase: fast-forward to onto if it is a proper descendant
  builtin rebase: show progress when connected to a terminal
  builtin rebase: use no-op editor when interactive is "implied"
  builtin rebase: error out on incompatible option/mode combinations

 builtin/rebase.c | 150 ++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 135 insertions(+), 15 deletions(-)