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.cou...@gmail.com>
Mentored-by: Stefan Beller <sbel...@google.com>
Signed-off-by: Prathamesh Chavan <pc44...@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

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