[PATCH v4 0/7] %(trailers) improvements in pretty format

Updated since v3:
 * multiple 'key=' matches any
 * allow overriding implicit 'only' when using key
 * minor grammar and spelling fixes
 * documentation restructuring
 * Helper functions for parsing options

Anders Waldenborg (7):
  doc: group pretty-format.txt placeholders descriptions
  pretty: allow %(trailers) options with explicit value
  pretty: single return path in %(trailers) handling
  pretty: allow showing specific trailers
  pretty: add support for "valueonly" option in %(trailers)
  strbuf: separate callback for strbuf_expand:ing literals
  pretty: add support for separator option in %(trailers)

 Documentation/pretty-formats.txt | 260 ++++++++++++++++++-------------
 pretty.c                         | 104 ++++++++++---
 strbuf.c                         |  21 +++
 strbuf.h                         |   8 +
 t/t4205-log-pretty-formats.sh    | 111 +++++++++++++
 trailer.c                        |  25 ++-
 trailer.h                        |   4 +
 7 files changed, 400 insertions(+), 133 deletions(-)