[PATCH 0/7] Various updates to make core.ignorecase=true work better

This is a follow up patch to one I posted mid last year specifically for making .gitignore entries be processed in a case insensitive manner. I have used the patch with success since then, but I was unable to make the updates requested by list members.

Over the past month, I have been able to clean up the code and extend the core.ignorecase=true support to better handle git status, ls-files, log, add, and fast-import.

git status and add both use an update made to name-hash.c where directories, specifically names with a trailing slash, can be looked up in a case insensitive manner. After trying a myriad of solutions, this seemed to be the cleanest. Does anyone see a problem with embedding the directory names in the same hash as the file names? I couldn't find one, especially since I append a slash to each directory name.

The new directory_exists_in_index_icase() duplicates some of the functionality in directory_exists_in_index(). I don't understand some of the functionality I just mindlessly cloned. Can anyone clue me in on what directory_exists_in_index() achieves in the case of S_ISGITLINK()?

Updating match_one() bought case insensitive matching support for git ls-files? Are there other side effects I haven't found yet?

The git add path case folding functionality is a somewhat radical departure from what Git does now. It is described in detail in patch 6. Does anyone have any concerns?

Joshua Jensen (7):
  Add string comparison functions that respect the ignore_case
    variable.
  Case insensitivity support for .gitignore via core.ignorecase
  Add case insensitivity support for directories when using git status
  Add case insensitivity support when using git ls-files
  Add support for case insensitive directory and file lookups to git
    log
  Support case folding for git add when core.ignorecase=true
  Support case folding in git fast-import when core.ignorecase=true

 dir.c         |  110 +++++++++++++++++++++++++++++++++++++++++++++++----------
 dir.h         |    5 +++
 fast-import.c |    3 +-
 name-hash.c   |   44 ++++++++++++++++++++++-
 read-cache.c  |   16 ++++++++
 tree-diff.c   |    9 +++--
 6 files changed, 162 insertions(+), 25 deletions(-)