[PATCH v6 0/3] Incremental rewrite of git-submodules

changes in v6:

* The function get_submodule_displaypath() was modified for the case
  when get_super_prefix() returns a non-null value. The condition to check
  if the super-prefix ends with a '/' is removed. To accomodate this change
  appropriate value of super_prefix is passed instead in the recursive calls
  of init_submodule() and status_submodule().

* To accomodate the possiblity of a direct call to the function
  init_submodule(), a callback function init_submodule_cb() is introduced
  which takes cache_entry and init_cb structures as input params, and
  calls init_submodule() with parameters which are more appropriate
  for a direct call of this function.

* Similar changes were even done for status_submodule(). But as it was
  observed that the number of params increased a lot due to flags
  like quiet, recursive, cached, etc, and keeping in mind the future
  subcommand's ported functions as well, a single unsigned int called
  cb_flags was introduced to store all of these flags, instead of having
  parameter for each one.

* Patches [3/4] and [4/4] from the previous series were merged as a single
  step.

* Call to function cmd_diff_files was avoided in the function status_submodule()
  and instead used the function run_diff_files() for the same purpose.

Since there were many changes the patches required, I took more time on making these changes. Thank you, Junio for the last reviews. They helped a lot for improving the patch series.

As before you can find this series at: https://github.com/pratham-pc/git/commits/patch-series-1

And its build report is available at: 
https://travis-ci.org/pratham-pc/git/builds/
Branch: patch-series-1
Build #184

Prathamesh Chavan (3):
  submodule--helper: introduce get_submodule_displaypath()
  submodule--helper: introduce for_each_listed_submodule()
  submodule: port submodule subcommand 'status' from shell to C

 builtin/submodule--helper.c | 281 +++++++++++++++++++++++++++++++++++++++++---
 git-submodule.sh            |  61 +---------
 2 files changed, 265 insertions(+), 77 deletions(-)