Re: [GSoC][PATCH 2/6] submodule--helper: introduce get_submodule_displaypath and for_each_submodule_list

> Functions get_submodule_displaypath and for_each_submodule_list
> for using them in the later patches, related to porting submodule
> subcommands from shell to C.
> These new functions are also used in ported submodule subcommand
> init

> 
> 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 | 69 ++++++++++++++++++++++++++++++++-------------
>  1 file changed, 50 insertions(+), 19 deletions(-)
> 
> diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
> index 8cc648d85..f7adca95b 100644
> --- a/builtin/submodule--helper.c
> +++ b/builtin/submodule--helper.c
> @@ -13,6 +13,9 @@
>  #include "refs.h"
>  #include "connect.h"
>  
> +typedef void (*submodule_list_func_t)(const struct cache_entry *list_item,
> +				      void *cb_data);
> +
>  static char *get_default_remote(void)
>  {
>  	char *dest = NULL, *ret;
> @@ -219,6 +222,27 @@ static int resolve_relative_url_test(int argc, const char **argv, const char *pr
>  	return 0;
>  }
>  
> +static char *get_submodule_displaypath(const char *path, const char *prefix)
> +{
> +	const char *super_prefix = get_super_prefix();
> +
> +	if (prefix && super_prefix) {
> +		BUG("cannot have prefix '%s' and superprefix '%s'",
> +		    prefix, super_prefix);
> +	} else if (prefix) {
> +		struct strbuf sb = STRBUF_INIT;
> +		char *displaypath = xstrdup(relative_path(path, prefix, &sb));
> +		strbuf_release(&sb);
> +		return displaypath;
> +	} else if (super_prefix) {
> +		int len = strlen(super_prefix);
> +		const char *format = is_dir_sep(super_prefix[len-1]) ? "%s%s" : "%s/%s";
> +		return xstrfmt(format, super_prefix, path);
> +	} else {
> +		return xstrdup(path);
> +	}
> +}
> +
>  struct module_list {
>  	const struct cache_entry **entries;
>  	int alloc, nr;
> @@ -330,26 +354,30 @@ static int module_list(int argc, const char **argv, const char *prefix)
>  	return 0;
>  }
>  
> -static void init_submodule(const char *path, const char *prefix, int quiet)
> +static void for_each_submodule_list(const struct module_list list,
> +				    submodule_list_func_t fn, void *cb_data)
>  {
> +	int i;
> +	for (i = 0; i < list.nr; i++)
> +		fn(list.entries[i], cb_data);
> +}
> +
> +struct init_cb {
> +	const char *prefix;
> +	unsigned int quiet: 1;
> +};
> +#define INIT_CB_INIT { NULL, 0 }
> +
> +static void init_submodule(const struct cache_entry *list_item, void *cb_data)
> +{
> +	struct init_cb *info = cb_data;
>  	const struct submodule *sub;
>  	struct strbuf sb = STRBUF_INIT;
>  	char *upd = NULL, *url = NULL, *displaypath;
>  
> -	/* Only loads from .gitmodules, no overlay with .git/config */
> -	gitmodules_config();
> -
> -	if (prefix && get_super_prefix())
> -		die("BUG: cannot have prefix and superprefix");
> -	else if (prefix)
> -		displaypath = xstrdup(relative_path(path, prefix, &sb));
> -	else if (get_super_prefix()) {
> -		strbuf_addf(&sb, "%s%s", get_super_prefix(), path);
> -		displaypath = strbuf_detach(&sb, NULL);
> -	} else
> -		displaypath = xstrdup(path);
> +	displaypath = get_submodule_displaypath(list_item->name, info->prefix);
>  
> -	sub = submodule_from_path(null_sha1, path);
> +	sub = submodule_from_path(null_sha1, list_item->name);
>  
>  	if (!sub)
>  		die(_("No url found for submodule path '%s' in .gitmodules"),
> @@ -361,7 +389,7 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
>  	 *
>  	 * Set active flag for the submodule being initialized
>  	 */
> -	if (!is_submodule_initialized(path)) {
> +	if (!is_submodule_initialized(list_item->name)) {
>  		strbuf_reset(&sb);
>  		strbuf_addf(&sb, "submodule.%s.active", sub->name);
>  		git_config_set_gently(sb.buf, "true");
> @@ -404,7 +432,7 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
>  		if (git_config_set_gently(sb.buf, url))
>  			die(_("Failed to register url for submodule path '%s'"),
>  			    displaypath);
> -		if (!quiet)
> +		if (!info->quiet)
>  			fprintf(stderr,
>  				_("Submodule '%s' (%s) registered for path '%s'\n"),
>  				sub->name, url, displaypath);
> @@ -433,10 +461,10 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
>  
>  static int module_init(int argc, const char **argv, const char *prefix)
>  {
> +	struct init_cb info = INIT_CB_INIT;
>  	struct pathspec pathspec;
>  	struct module_list list = MODULE_LIST_INIT;
>  	int quiet = 0;
> -	int i;
>  
>  	struct option module_init_options[] = {
>  		OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
> @@ -461,8 +489,11 @@ static int module_init(int argc, const char **argv, const char *prefix)
>  	if (!argc && git_config_get_value_multi("submodule.active"))
>  		module_list_active(&list);
>  
> -	for (i = 0; i < list.nr; i++)
> -		init_submodule(list.entries[i]->name, prefix, quiet);
> +	info.prefix = prefix;
> +	info.quiet = !!quiet;
> +
> +	gitmodules_config();
> +	for_each_submodule_list(list, init_submodule, &info);
>  
>  	return 0;
>  }
> -- 
> 2.13.0
>