[PATCH v4 00/16] port branch.c to use ref-filter's printing options

This is part of unification of the commands 'git tag -l, git branch -l and git for-each-ref'. This ports over branch.c to use ref-filter's printing options.

Initially posted here: $(gmane/279226). It was decided that this series would follow up after refactoring ref-filter parsing mechanism, which is now merged into master (9606218b32344c5c756f7c29349d3845ef60b80c).

v1 can be found here: $(gmane/288342) v2 can be found here: $(gmane/288863) v3 can be found here: $(gmane/290299)

Changes in this version:
1. Rebased on top of Erics changes, this was breaking tests. Thanks
to Dennis Kaarsemaker and Ramsay Jones for reporting this in.
2. Show local branch symrefs if available, changed this in the format
for `git branch -l`.

Thanks to Junio, Matthieu, Dennis and Ramsay for all suggestions on the previous iteration.

Karthik Nayak (16):
  ref-filter: implement %(if), %(then), and %(else) atoms
  ref-filter: include reference to 'used_atom' within 'atom_value'
  ref-filter: implement %(if:equals=<string>) and
    %(if:notequals=<string>)
  ref-filter: modify "%(objectname:short)" to take length
  ref-filter: move get_head_description() from branch.c
  ref-filter: introduce format_ref_array_item()
  ref-filter: make %(upstream:track) prints "[gone]" for invalid
    upstreams
  ref-filter: add support for %(upstream:track,nobracket)
  ref-filter: make "%(symref)" atom work with the ':short' modifier
  ref-filter: introduce symref_atom_parser()
  ref-filter: introduce refname_atom_parser()
  ref-filter: add support for %(refname:dir) and %(refname:base)
  ref-filter: allow porcelain to translate messages in the output
  branch, tag: use porcelain output
  branch: use ref-filter printing APIs
  branch: implement '--format' option

 Documentation/git-branch.txt       |   7 +-
 Documentation/git-for-each-ref.txt |  63 +++++-
 builtin/branch.c                   | 268 ++++++----------------
 builtin/tag.c                      |   2 +
 ref-filter.c                       | 447 +++++++++++++++++++++++++++++++------
 ref-filter.h                       |   7 +
 t/t3203-branch-output.sh           |  12 +
 t/t6040-tracking-info.sh           |   2 +-
 t/t6300-for-each-ref.sh            |  40 +++-
 t/t6302-for-each-ref-filter.sh     |  94 ++++++++
 10 files changed, 664 insertions(+), 278 deletions(-)

Interdiff: