The --reroll-count=$N option, when given a positive integer:

 - Adds " v$N" to the subject prefix specified.  As the default
   subject prefix string is "PATCH", --reroll-count=2 makes it
   "PATCH v2".

 - Prefixes "v$N-" to the names used for output files.  The cover
   letter, whose name is usually 0000-cover-letter.patch, becomes
   v2-0000-cover-letter.patch when given --reroll-count=2.

This allows users to use the same --output-directory for multiple
iterations of the same series, without letting the output for a
newer round overwrite output files from the earlier rounds.  The
user can incorporate materials from earlier rounds to update the
newly minted iteration, and use "send-email v2-*.patch" to send out
the patches belonging to the second iteration easily.

The early patches of this series are all preparatory clean-ups. I
think reopen_stdout() also can be cleaned up, but I'll leave it to
a future reroll.

Junio C Hamano (7):
  builtin/log.c: drop unused "numbered" parameter from
  builtin/log.c: drop redundant "numbered_files" parameter from
  builtin/log.c: stop using global patch_suffix
  get_patch_filename(): simplify function signature
  get_patch_filename(): drop "just-numbers" hack
  get_patch_filename(): split into two functions
  format-patch: add --reroll-count=$N option

 builtin/log.c | 33 ++++++++++++++++++++++++---------
 log-tree.c    | 52 +++++++++++++++++++++++++++++++---------------------
 log-tree.h    |  4 ++--
 revision.h    |  1 +
 4 files changed, 58 insertions(+), 32 deletions(-)


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