[PATCH v3 00/15] ref-filter: use parsing functions

This series cleans up populate_value() in ref-filter, by moving out the parsing part of atoms to separate parsing functions. This ensures that parsing is only done once and also improves the modularity of the code.

v1: http://thread.gmane.org/gmane.comp.version-control.git/281180 v2: http://thread.gmane.org/gmane.comp.version-control.git/282563

Changes in this version:
* Change variable name in 'used_atom' from 'str' to 'name'.
* Split introduction of 'used_atom' into [3/15], [4/15] and [5/15].
* In [8/15] parse the color in color_atom_parser() itself and pass the
value to 'v->s' in populate_value().
* Introduce [11/15] which changes 'width' in align_atom_parser() from
int to unsigned int.
* Fix error in code in align_atom_parser(). and split it into [9/15],
[10/15], [11/15] and [12/15].
* Change 'align' atom tests to a table form.
* Change 'no_lines' to 'nlines' in used_atom.
* Switch to starts_with()/strcmp() instead of match_atom_name() as required.
* Changes in commit message and comments.
* Improve readability of code.

Eric suggested that I make match_atom_name() not return a value [0]. I haven't done that as we use match_atom_name() in [14/15] for matching 'subject' and 'body' in contents_atom_parser() and although Eric suggested I use strcmp() instead, this would not work as we need to check for derefernced 'subject' and 'body' atoms.

[0]: http://article.gmane.org/gmane.comp.version-control.git/282701

Karthik Nayak (15):
  strbuf: introduce strbuf_split_str_omit_term()
  ref-filter: use strbuf_split_str_omit_term()
  ref-filter: bump 'used_atom' and related code to the top
  ref-filter: introduce struct used_atom
  ref-filter: introduce parsing functions for each valid atom
  ref-fitler: bump match_atom() name to the top
  ref-filter: skip deref specifier in match_atom_name()
  ref-filter: introduce color_atom_parser()
  ref-filter: introduce align_atom_parser()
  ref-filter: introduce parse_align_position()
  ref-filter: convert variable 'width' to an unsigned int
  ref-filter: align: introduce long-form syntax
  ref-filter: introduce remote_ref_atom_parser()
  ref-filter: introduce contents_atom_parser()
  ref-filter: introduce objectname_atom_parser()

 Documentation/git-for-each-ref.txt |  20 +-
 ref-filter.c                       | 455 ++++++++++++++++++++++---------------
 strbuf.c                           |   7 +-
 strbuf.h                           |  25 +-
 t/t6302-for-each-ref-filter.sh     |  41 ++++
 5 files changed, 349 insertions(+), 199 deletions(-)