Re: [GSoC][PATCH 4/8] submodule: port submodule subcommand 'status' from shell to C

> This aims to make git-submodule 'status' a built-in. Hence, the function
> cmd_status() is ported from shell to C. This is done by introducing
> three functions: module_status(), submodule_status() and print_status().
>
> The function module_status() acts as the front-end of the subcommand.
> It parses subcommand's options and then calls the function
> module_list_compute() for computing the list of submodules. Then
> this functions calls for_each_submodule_list() looping through the
> list obtained.
>
> Then for_each_submodule_list() calls submodule_status() for each of the
> submodule in its list. The function submodule_status() is responsible
> for generating the status each submodule it is called for, and
> then calls print_status().
>
> Finally, the function print_status() handles the printing of submodule's
> status.
>
> Mentored-by: Christian Couder <christian.couder@gmail.com>
> Mentored-by: Stefan Beller <sbeller@google.com>
> Signed-off-by: Prathamesh Chavan <pc44800@gmail.com>
> ---
>  builtin/submodule--helper.c | 146 ++++++++++++++++++++++++++++++++++++++++++++
>  git-submodule.sh            |  49 +--------------
>  2 files changed, 147 insertions(+), 48 deletions(-)
>
> diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
> index 80f744407..9c1630495 100644
> --- a/builtin/submodule--helper.c
> +++ b/builtin/submodule--helper.c
> @@ -560,6 +560,151 @@ static int module_init(int argc, const char **argv, const char *prefix)
>         return 0;
>  }
>
> +struct status_cb {
> +       const char *prefix;
> +       unsigned int quiet: 1;
> +       unsigned int recursive: 1;
> +       unsigned int cached: 1;
> +};
> +#define STATUS_CB_INIT { NULL, 0, 0, 0 }
> +
> +static void print_status(struct status_cb *info, char state, const char *path,
> +                        char *sub_sha1, char *displaypath)
> +{
> +       if (info->quiet)
> +               return;
> +
> +       printf("%c%s %s", state, sub_sha1, displaypath);
> +
> +       if (state == ' ' || state == '+') {
> +               struct argv_array name_rev_args = ARGV_ARRAY_INIT;
> +
> +               argv_array_pushl(&name_rev_args, "print-name-rev",
> +                                path, sub_sha1, NULL);
> +               print_name_rev(name_rev_args.argc, name_rev_args.argv,
> +                              info->prefix);
> +       } else {
> +               printf("\n");
> +       }
> +}
> +
> +static int handle_submodule_head_ref(const char *refname,
> +                                    const struct object_id *oid, int flags,
> +                                    void *cb_data)
> +{
> +       struct strbuf *output = cb_data;
> +       if (oid)
> +               strbuf_addstr(output, oid_to_hex(oid));
> +       return 0;
> +}
> +
> +static void status_submodule(const struct cache_entry *list_item, void *cb_data)
> +{
> +       struct status_cb *info = cb_data;
> +       char *sub_sha1 = xstrdup(oid_to_hex(&list_item->oid));
> +       char *displaypath;
> +       struct stat st;
> +
> +       if (!submodule_from_path(null_sha1, list_item->name))
> +               die(_("no submodule mapping found in .gitmodules for path '%s'"),
> +                     list_item->name);
> +
> +       displaypath = get_submodule_displaypath(list_item->name, info->prefix);
> +
> +       if (list_item->ce_flags) {
> +               print_status(info, 'U', list_item->name,
> +                            sha1_to_hex(null_sha1), displaypath);
> +               goto cleanup;
> +       }
> +
> +       if (!is_submodule_active(the_repository, list_item->name)) {
> +               print_status(info, '-', list_item->name, sub_sha1, displaypath);
> +               goto cleanup;
> +       }
> +
> +       if (!lstat(list_item->name, &st) && !ce_match_stat(list_item, &st, 0)) {
> +               print_status(info, ' ', list_item->name, sub_sha1, displaypath);