[PATCH v5 0/2] Add new "describe" atom

Hi, Thanks for the review on the previous version of this series. Here is a quick re-roll to address the minor changes that you left on the previous version (apart from the suggestions to PATCH 1/2).

Please queue this instead.

PATCH 1/2 - Left unchanged

PATCH 2/2 - Used the test helper function `test_must_fail` instead of
	    something like "! git foo" for making a command fail.

Kousik Sanagavarapu (2):
  ref-filter: add multiple-option parsing functions
  ref-filter: add new "describe" atom

 Documentation/git-for-each-ref.txt |  23 +++
 ref-filter.c                       | 230 +++++++++++++++++++++++++++++
 t/t6300-for-each-ref.sh            | 139 +++++++++++++++++
 3 files changed, 392 insertions(+)

Range-diff against v4:
1:  2914bd58ec = 1:  2914bd58ec ref-filter: add multiple-option parsing functions
2:  77a2a56520 ! 2:  8127f4399c ref-filter: add new "describe" atom
    @@ t/t6300-for-each-ref.sh: test_expect_success 'color.ui=always does not override
     +          cat >expect <<-\EOF &&
     +          fatal: unrecognized %(describe) argument: baz
     +          EOF
    -+          ! git for-each-ref --format="%(describe:baz)" \
    ++          test_must_fail git for-each-ref \
    ++                  --format="%(describe:baz)" \
     +                  refs/heads/master 2>actual &&
     +          test_cmp expect actual &&
     +
    @@ t/t6300-for-each-ref.sh: test_expect_success 'color.ui=always does not override
     +          cat >expect <<-\EOF &&
     +          fatal: unrecognized %(describe) argument: qux=1,abbrev=14
     +          EOF
    -+          ! git for-each-ref \
    ++          test_must_fail git for-each-ref \
     +                  --format="%(describe:tags,qux=1,abbrev=14)" \
     +                  ref/heads/master 2>actual &&
     +          test_cmp expect actual