[PATCH v4 00/19] object_id part 6

This is another series in the continuing conversion to struct object_id.

This series converts more of the builtin directory and some of the refs code to use struct object_id. Additionally, it implements an nth_packed_object_oid function which provides a struct object_id version of the nth_packed_object function, and a parse_oid_hex function that makes parsing easier.

Changes from v3:
* Move the parse_oid_hex patch earlier in the series.
* Use parse_oid_hex in builtin/diff-tree.c.
* Fix several warts with parse_oid_hex pointed out by Peff.

Changes from v2:
* Fix misnamed function in commit message.
* Improve parameter name of parse_oid_hex.
* Improve docstring of parse_oid_hex.
* Remove needless variable.
* Rebase on master.

Changes from v1:
* Implement parse_oid_hex and use it.
* Make nth_packed_object_oid take a variable into which to store the
  object ID.  This avoids concerns about unsafe casts.
* Rebase on master.

brian m. carlson (19):
  hex: introduce parse_oid_hex
  builtin/commit: convert to struct object_id
  builtin/diff-tree: convert to struct object_id
  builtin/describe: convert to struct object_id
  builtin/fast-export: convert to struct object_id
  builtin/fmt-merge-message: convert to struct object_id
  builtin/grep: convert to struct object_id
  builtin/branch: convert to struct object_id
  builtin/clone: convert to struct object_id
  builtin/merge: convert to struct object_id
  Convert remaining callers of resolve_refdup to object_id
  builtin/replace: convert to struct object_id
  reflog-walk: convert struct reflog_info to struct object_id
  refs: convert each_reflog_ent_fn to struct object_id
  refs: simplify parsing of reflog entries
  sha1_file: introduce an nth_packed_object_oid function
  Convert object iteration callbacks to struct object_id
  builtin/merge-base: convert to struct object_id
  wt-status: convert to struct object_id

 builtin/branch.c        |  26 +++++-----
 builtin/cat-file.c      |   8 +--
 builtin/clone.c         |  10 ++--
 builtin/commit.c        |  46 ++++++++---------
 builtin/count-objects.c |   4 +-
 builtin/describe.c      |  50 +++++++++---------
 builtin/diff-tree.c     |  43 ++++++++--------
 builtin/fast-export.c   |  58 ++++++++++-----------
 builtin/fmt-merge-msg.c |  70 ++++++++++++-------------
 builtin/fsck.c          |  40 +++++++--------
 builtin/grep.c          |  24 ++++-----
 builtin/merge-base.c    |  30 +++++------
 builtin/merge.c         | 134 ++++++++++++++++++++++++------------------------
 builtin/notes.c         |  18 +++----
 builtin/pack-objects.c  |   6 +--
 builtin/prune-packed.c  |   4 +-
 builtin/prune.c         |   8 +--
 builtin/receive-pack.c  |   4 +-
 builtin/reflog.c        |   2 +-
 builtin/replace.c       | 112 ++++++++++++++++++++--------------------
 cache.h                 |  19 ++++++-
 hex.c                   |   8 +++
 reachable.c             |  30 +++++------
 ref-filter.c            |   4 +-
 reflog-walk.c           |  26 +++++-----
 refs.c                  |  24 ++++-----
 refs.h                  |   2 +-
 refs/files-backend.c    |  29 ++++++-----
 revision.c              |  12 ++---
 sha1_file.c             |  27 +++++++---
 sha1_name.c             |   2 +-
 transport.c             |   4 +-
 wt-status.c             |  52 +++++++++----------
 33 files changed, 484 insertions(+), 452 deletions(-)