[PATCH v4 00/18] Reroll the line log series

Modifications:
1. We do the parent rewriting with a more sane way. Just like the way we deal with multiple pathspec pruning, we rewrite P to its parent P^, if P^ can take all the interesting ranges from P. Otherwise, we keep P.
2. --graph will not override --full-line-diff any more. Now, they are two totally different options. You can use --full-line-diff with or without --graph.
3. Bug fix, this includes:
   * --graph outputs correct graph lines
   * mark a commit as root one if it takes no ranges
   * some other minor fix...

Bo Yang (18):
  parse-options: enhance STOP_AT_NON_OPTION
  parse-options: add two helper functions
  Add the basic data structure for line level history
  Refactor parse_loc
  Parse the -L options
  Export three functions from diff.c
  Add range clone functions
  map/take range to the parent of commits
  Print the line log
  Hook line history into cmd_log, ensuring a topo-ordered walk
  Add tests for line history browser
  Make rewrite_parents public to other part of git
  Make graph_next_line external to other part of git
  Add parent rewriting to line history browser
  Add --graph prefix before line history output
  Add --full-line-diff option
  Add test cases for '--graph' of line level log
  Document line history browser

 Documentation/blame-options.txt     |   19 +-
 Documentation/git-log.txt           |   15 +
 Documentation/line-range-format.txt |   18 +
 Makefile                            |    2 +
 builtin/blame.c                     |   89 +--
 builtin/log.c                       |  111 +++-
 diff.c                              |    6 +-
 diff.h                              |   17 +
 diffcore.h                          |    1 +
 graph.c                             |   14 +-
 graph.h                             |   10 +
 line.c                              | 1563 +++++++++++++++++++++++++++++++++++
 line.h                              |  141 ++++
 parse-options.c                     |   22 +-
 parse-options.h                     |    7 +-
 revision.c                          |   25 +-
 revision.h                          |   23 +-
 t/t4301-log-line-single-history.sh  |  619 ++++++++++++++
 t/t4302-log-line-merge-history.sh   |  163 ++++
 19 files changed, 2736 insertions(+), 129 deletions(-)
 create mode 100644 Documentation/line-range-format.txt
 create mode 100644 line.c
 create mode 100644 line.h
 create mode 100755 t/t4301-log-line-single-history.sh
 create mode 100755 t/t4302-log-line-merge-history.sh