[PATCH 0/6] Introduce commit notes

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

Hi,

This patch series replaces the series I sent out a while ago, which added 
"commit annotations".  Since "commit notes" was liked much better, here 
they are.

It picks up the same idea, having a pseudo-branch whose revisions contain 
a .git/objects/??/* like file structure, and whose blobs are the commit 
notes.

By default, that pseudo-branch is "refs/notes/commits", but it is 
overridable by the config variable core.notesRef, which in turn can be 
overridden by the environment variable GIT_NOTES_REF.  If the given ref 
does not exist yet, it is interpreted as empty.

The biggest obstacle was a thinko about the scalability.  Tree objects 
take free form name entries, and therefore a binary search by name is not 
possible.

Patch 6/6 is only a WIP patch, but it shows the road ahead.  It adds code 
to generate .git/notes-index from refs/notes/commits (or any other ref you 
specify as notes ref), which is reused until refs/notes/commits^{tree} 
changes.  Patch 6/6 is only meant to assess which data structure yields 
best performance, and how big the costs are.

However, as long as there are no public, fetchable commit notes, I think 
the first 5 patches are safe for application and testing.

Ciao,
Dscho

Johannes Schindelin (6):
      Rename git_one_line() to git_line_length() and export it
      Introduce commit notes
      Add git-notes
      Add a test script for "git notes"
      Document git-notes
      notes: add notes-index for a substantial speedup.

 .gitignore                       |    1 +
 Documentation/cmd-list.perl      |    1 +
 Documentation/config.txt         |   15 ++
 Documentation/git-notes.txt      |   45 ++++
 Makefile                         |    5 +-
 cache.h                          |    1 +
 commit.c                         |   15 +-
 commit.h                         |    1 +
 config.c                         |    5 +
 environment.c                    |    1 +
 git-notes.sh                     |   61 ++++++
 notes.c                          |  416 ++++++++++++++++++++++++++++++++++++++
 notes.h                          |    9 +
 t/t3301-notes.sh                 |   63 ++++++
 t/t3302-notes-index-expensive.sh |  118 +++++++++++
 15 files changed, 750 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/git-notes.txt
 create mode 100755 git-notes.sh
 create mode 100644 notes.c
 create mode 100644 notes.h
 create mode 100755 t/t3301-notes.sh
 create mode 100755 t/t3302-notes-index-expensive.sh