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[PATCH v2 0/2] rebase: understand -C again, refactor

Phillip Wood reported a problem where the built-in rebase did not understand
options like -C1, i.e. it did not expect the option argument.

While investigating how to address this best, I stumbled upon 
OPT_PASSTHRU_ARGV (which I was so far happily unaware of).

Instead of just fixing the -C<n> bug, I decided to simply convert all of the
options intended for git am (or, eventually, for git apply). This happens to
fix that bug, and does so much more: it simplifies the entire logic (and
removes more lines than it adds).

Change since v1:

 * Introduce early parameter validation for the options passed through to 
   git am.

Johannes Schindelin (2):
  rebase: really just passthru the `git am` options
  rebase: validate -C<n> and --whitespace=<mode> parameters early

 builtin/rebase.c          | 108 ++++++++++++++++----------------------
 t/t3406-rebase-message.sh |   7 +++
 2 files changed, 52 insertions(+), 63 deletions(-)

base-commit: 8858448bb49332d353febc078ce4a3abcc962efe
Published-As: https://github.com/gitgitgadget/git/releases/tags/pr-76%2Fdscho%2Frebase-Cn-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-76/dscho/rebase-Cn-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/76

Range-diff vs v1:

 1:  dc36a45068 = 1:  dc36a45068 rebase: really just passthru the `git am` options
 -:  ---------- > 2:  4c2ba52766 rebase: validate -C<n> and --whitespace=<mode> parameters early