[PATCH 0/5] minor ref-filter error-reporting bug-fixes

This series fixes a few small inconsistencies in the error-reporting from ref-filter's atom parsers. Mostly I noticed this while dealing with unused parameters in one of the parsers, which led to noticing a few other small bugs. And I hope the result is a little cleaner, as it should reduce the number of strings needing translation.

  [1/5]: ref-filter: reject arguments to %(HEAD)
  [2/5]: ref-filter: factor out "%(foo) does not take arguments" errors
  [3/5]: ref-filter: factor out "unrecognized %(foo) arg" errors
  [4/5]: ref-filter: truncate atom names in error messages
  [5/5]: ref-filter: convert email atom parser to use err_bad_arg()

 ref-filter.c            | 44 +++++++++++++++++++++++++++++------------
 t/t6300-for-each-ref.sh | 18 +++++++++++++++++
 2 files changed, 49 insertions(+), 13 deletions(-)

-Peff