[PATCH v4 0/2] Add in-place editing support to git interpret-trailers

This patch series adds support for in-place editing to git interpret-trailers akin to sed -i, perl -i.

v3->v4:
 - Reword a test title, as suggested by Eric Sunshine.
 - Add a test to verify that the original file is not clobbered/deleted
   on error, as suggested by Eric Sunshine.
 - Move code specific to in-place editing from process_trailers() into a
   separate function to keep the overall flow clean. Suggested by Eric
   Sunshine.
 - Drop unnecessary braces, as pointed out by Eric Sunshine.
 - Use a more meaningful title for patch 1/2. Suggested by Junio Hamano.

v2->v3:
 - Rephrase two error messages according to the suggestions by Matthieu
   Moy.

v1->v2:
 - Split patch to make review easier, as suggested by Matthieu Moy.
 - Rename FILE * function parameters to a more readable name, as
   suggested by Matthieu Moy.
 - Write output to temporary file and rename after successfully written
   in full to avoid losing the original file in case of an
   error/interrupt. Pointed out by Eric Sunshine.

Tobias Klauser (2):
  trailer: allow to write to files other than stdout
  interpret-trailers: add option for in-place editing

 Documentation/git-interpret-trailers.txt | 24 ++++++++++-
 builtin/interpret-trailers.c             | 13 ++++--
 t/t7513-interpret-trailers.sh            | 40 ++++++++++++++++++
 trailer.c                                | 69 +++++++++++++++++++++++++-------
 trailer.h                                |  3 +-
 5 files changed, 129 insertions(+), 20 deletions(-)