[PATCH v2 0/6] Support %(trailers) arguments in for-each-ref(1)

Hi,

Attached is v2 of my patch-set "Support %(trailers) arguments in
for-each-ref(1)".

It includes the following changes since v1:

  * Accept "empty-sub-argument" lists, like %(contents:trailers:).

  * Fix incorrect tabs/spaces formatting in t6300.

  * Modern-ize code fencing in Documentation/git-for-each-ref.txt

  * Squash commit adding trailer_opts to used_atom structure.

---

  [1/6]: pretty.c: delimit "%(trailers)" arguments with ","
  [2/6]: t6300: refactor %(trailers) tests
  [3/6]: doc: 'trailers' is the preferred way to format trailers
  [4/6]: doc: use modern "`"-style code fencing
  [5/6]: ref-filter.c: use trailer_opts to format trailers
  [6/6]: ref-filter.c: parse trailers arguments with %(contents) atom

Thanks in advance :-).

--
- Taylor