[GSoC][PATCH v2 0/3] rebase -i: rewrite reflog operations in C

This patch series rewrites the reflog operations from shell to C. This is part of the effort to rewrite interactive rebase in C.

The first commit is dedicated to creating a function to silence a command, as the sequencer will do in several places with these patches.

This branch is based on ag/rebase-i-rewrite-todo, and does not conflict with pu (as of 2018-06-19).

Changes since v1:

 - Replacing run_command_silent_if_successful() by
   run_command_silent_on_success() in the first commit’s message (thanks
   Christian!)

 - Adding a “verbose” parameter to run_command_silent_on_success()
   (thanks Phillip!)

 - Using OPT__VERBOSE to parse the “--verbose” flag (thanks Stefan!)

 - Fixing some typos and errors in the commit messages

 - Renaming “setup-reflog” to “checkout-base”

 - Renaming checkout_base_commit() to run_git_checkout()

 - Replacing calls to die() by error()

Alban Gruin (3):
  sequencer: add a new function to silence a command, except if it
    fails.
  rebase -i: rewrite setup_reflog_action() in C
  rebase -i: rewrite checkout_onto() in C

 builtin/rebase--helper.c   |  14 ++++++-
 git-rebase--interactive.sh |  39 +++--------------
 sequencer.c                | 102 +++++++++++++++++++++++++++++++++------------
 sequencer.h                |   6 +++
 4 files changed, 99 insertions(+), 62 deletions(-)