[RFC][PATCH 0/2] submodule: port 'set-url' from shell to C

Hello all,

This is my very first attempt at the conversion of subcommand 'set-url' from shell to C, thus making the subcommand a builtin.

I have based my conversion by looking at the way other subcommands have been implemented in 'submodule--helper.c' as well as the subcommand 'set-url' in 'remote.c'. The approach I have taken is as follows:

1. Create a helper function 'update_url_in_gitmodules()' in 'submodule.c'
   to update the URL of an entry in '.gitmodules'.

2. Port the function 'cmd_set_url()' in 'git-submodule.sh' to 'module_set_url()'
   in 'submodule--helper.c'.

The issues I am facing are:

1. The patch fails test #2 in t7420, i.e., the test to verify the working of 'set-url'
   subcommand.

2. Though not an issue affecting the patch, but the 'usage' prompt of 'git submodule'
   does not show the subcommands 'set-url' and 'set-branch'.

Also, I am aware that the patch does not support the '--quiet' option. This is something I intended to add after ensuring that the patch works in the first place.

I understand that the patch is in a weak condition right now. How can this patch be improved? Any guidance from the community would be appreciated! :)

Thanks, Shourya Shukla

Shourya Shukla (2):
  submodule.c: update URL in .gitmodules using update_url_in_gitmodules
  submodule: port subcommand 'set-url' from shell to C

 builtin/submodule--helper.c | 38 +++++++++++++++++++++++++++++++++++++
 git-submodule.sh            | 23 ++--------------------
 submodule.c                 | 33 ++++++++++++++++++++++++++++++++
 submodule.h                 |  2 ++
 4 files changed, 75 insertions(+), 21 deletions(-)