I finished the refactoring and picked up suggestions from Eric and Junio.

Stefan Beller (3):
  submodule: Reimplement `module_list` shell function in C
  submodule: Reimplement `module_name` shell function in C
  submodule: Reimplement `module_clone` shell function in C

 .gitignore                  |   1 +
 Makefile                    |   1 +
 builtin.h                   |   1 +
 builtin/submodule--helper.c | 282 ++++++++++++++++++++++++++++++++++++++++++++
 git-submodule.sh            | 166 +++-----------------------
 git.c                       |   1 +
 6 files changed, 302 insertions(+), 150 deletions(-)
 create mode 100644 builtin/submodule--helper.c

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 63f535a..4e30d8e 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -38,17 +38,16 @@ static int module_list_compute(int argc, const char **argv,
        for (i = 0; i < active_nr; i++) {
                const struct cache_entry *ce = active_cache[i];
 
-               if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
+               if (!S_ISGITLINK(ce->ce_mode) ||
+                   !match_pathspec(pathspec, ce->name, ce_namelen(ce),
                                    max_prefix_len, ps_matched,
                                    S_ISGITLINK(ce->ce_mode) | 
S_ISDIR(ce->ce_mode)))
                        continue;
 
-               if (S_ISGITLINK(ce->ce_mode)) {
-                       ALLOC_GROW(ce_entries, ce_used + 1, ce_alloc);
-                       ce_entries[ce_used++] = ce;
-               }
-
-               while (i + 1 < active_nr && !strcmp(ce->name, active_cache[i + 
1]->name))
+               ALLOC_GROW(ce_entries, ce_used + 1, ce_alloc);
+               ce_entries[ce_used++] = ce;
+               while (i + 1 < active_nr &&
+                      !strcmp(ce->name, active_cache[i + 1]->name))
                        /*
                         * Skip entries with the same name in different stages
                         * to make sure an entry is returned only once.
@@ -69,10 +68,9 @@ static int module_list(int argc, const char **argv, const 
char *prefix)
 {
        int i;
        struct pathspec pathspec;
-       const char *alternative_path;
 
        struct option module_list_options[] = {
-               OPT_STRING(0, "prefix", &alternative_path,
+               OPT_STRING(0, "prefix", &prefix,
                           N_("path"),
                           N_("alternative anchor for relative paths")),
                OPT_END()
@@ -86,9 +84,7 @@ static int module_list(int argc, const char **argv, const 
char *prefix)
        argc = parse_options(argc, argv, prefix, module_list_options,
                             git_submodule_helper_usage, 0);
 
-       if (module_list_compute(argc, argv, alternative_path
-                                           ? alternative_path
-                                           : prefix, &pathspec) < 0) {
+       if (module_list_compute(argc, argv, prefix, &pathspec) < 0) {
                printf("#unmatched\n");
                return 1;
        }
@@ -111,13 +107,13 @@ static int module_name(int argc, const char **argv, const 
char *prefix)
        const struct submodule *sub;
 
        if (argc != 2)
-               usage("git submodule--helper module_name <path>\n");
+               usage(_("git submodule--helper name <path>"));
 
        gitmodules_config();
        sub = submodule_from_path(null_sha1, argv[1]);
 
        if (!sub)
-               die(N_("No submodule mapping found in .gitmodules for path 
'%s'"),
+               die(_("no submodule mapping found in .gitmodules for path 
'%s'"),
                    argv[1]);
 
        printf("%s\n", sub->name);
@@ -158,15 +154,14 @@ static int module_clone(int argc, const char **argv, 
const char *prefix)
 {
        const char *path = NULL, *name = NULL, *url = NULL;
        const char *reference = NULL, *depth = NULL;
-       const char *alternative_path = NULL, *p;
        int quiet = 0;
        FILE *submodule_dot_git;
-       char *sm_gitdir;
+       char *sm_gitdir, *cwd, *p;
        struct strbuf rel_path = STRBUF_INIT;
        struct strbuf sb = STRBUF_INIT;
 
        struct option module_clone_options[] = {
-               OPT_STRING(0, "prefix", &alternative_path,
+               OPT_STRING(0, "prefix", &prefix,
                           N_("path"),
                           N_("alternative anchor for relative paths")),
                OPT_STRING(0, "path", &path,
@@ -188,7 +183,7 @@ static int module_clone(int argc, const char **argv, const 
char *prefix)
                OPT_END()
        };
 
-       const char * const git_submodule_helper_usage[] = {
+       const char *const git_submodule_helper_usage[] = {
                N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
                   "[--reference <repository>] [--name <name>] [--url <url>]"
                   "[--depth <depth>] [--] [<path>...]"),
@@ -205,67 +200,64 @@ static int module_clone(int argc, const char **argv, 
const char *prefix)
                if (safe_create_leading_directories_const(sm_gitdir) < 0)
                        die(_("could not create directory '%s'"), sm_gitdir);
                if (clone_submodule(path, sm_gitdir, url, depth, reference, 
quiet))
-                       die(N_("clone of '%s' into submodule path '%s' failed"),
+                       die(_("clone of '%s' into submodule path '%s' failed"),
                            url, path);
        } else {
                if (safe_create_leading_directories_const(path) < 0)
                        die(_("could not create directory '%s'"), path);
-               if (unlink(sm_gitdir) < 0)
+               strbuf_addf(&sb, "%s/index", sm_gitdir);
+               if (unlink(sb.buf) < 0)
                        die_errno(_("failed to delete '%s'"), sm_gitdir);
+               strbuf_reset(&sb);
        }
 
        /* Write a .git file in the submodule to redirect to the superproject. 
*/
-       if (alternative_path && *alternative_path)) {
-               p = relative_path(path, alternative_path, &sb);
-               strbuf_reset(&sb);
-       } else
-               p = path;
+       if (safe_create_leading_directories_const(path) < 0)
+               die(_("could not create directory '%s'"), path);
 
-       if (safe_create_leading_directories_const(p) < 0)
-               die(_("could not create directory '%s'"), p);
-
-       strbuf_addf(&sb, "%s/.git", p);
+       if (path && *path)
+               strbuf_addf(&sb, "%s/.git", path);
+       else
+               strbuf_addf(&sb, ".git");
 
        if (safe_create_leading_directories_const(sb.buf) < 0)
                die(_("could not create leading directories of '%s'"), sb.buf);
        submodule_dot_git = fopen(sb.buf, "w");
        if (!submodule_dot_git)
-               die (_("cannot open file '%s': %s"), sb.buf, strerror(errno));
+               die_errno(_("cannot open file '%s'"), sb.buf);
 
        fprintf(submodule_dot_git, "gitdir: %s\n",
                relative_path(sm_gitdir, path, &rel_path));
        if (fclose(submodule_dot_git))
                die(_("could not close file %s"), sb.buf);
        strbuf_reset(&sb);
+       strbuf_reset(&rel_path);
 
+       cwd = xgetcwd();
        /* Redirect the worktree of the submodule in the superproject's config 
*/
-       if (strbuf_getcwd(&sb))
-               die_errno(_("unable to get current working directory"));
-
        if (!is_absolute_path(sm_gitdir)) {
-               if (strbuf_getcwd(&sb))
-                       die_errno(_("unable to get current working directory"));
-               strbuf_addf(&sb, "/%s", sm_gitdir);
+               strbuf_addf(&sb, "%s/%s", cwd, sm_gitdir);
                free(sm_gitdir);
                sm_gitdir = strbuf_detach(&sb, NULL);
        }
 
-
-       strbuf_addf(&sb, "/%s", path);
-
+       strbuf_addf(&sb, "%s/%s", cwd, path);
        p = git_pathdup_submodule(path, "config");
        if (!p)
                die(_("could not get submodule directory for '%s'"), path);
        git_config_set_in_file(p, "core.worktree",
                               relative_path(sb.buf, sm_gitdir, &rel_path));
        strbuf_release(&sb);
+       strbuf_release(&rel_path);
        free(sm_gitdir);
+       free(cwd);
+       free(p);
        return 0;
 }
 
 struct cmd_struct {
        const char *cmd;
-       int (*fct)(int, const char **, const char *);
+       int (*fn)(int, const char **, const char *);
 };
 
 static struct cmd_struct commands[] = {
@@ -278,22 +270,13 @@ int cmd_submodule__helper(int argc, const char **argv, 
const char *prefix)
 {
        int i;
        if (argc < 2)
-               goto out;
+               die(_("fatal: submodule--helper subcommand must be "
+                     "called with a subcommand"));
 
        for (i = 0; i < ARRAY_SIZE(commands); i++)
                if (!strcmp(argv[1], commands[i].cmd))
-                       return commands[i].fct(argc - 1, argv + 1, prefix);
-
-out:
-       if (argc > 1)
-               fprintf(stderr, _("fatal: '%s' is not a valid submodule--helper 
"
-                                 "subcommand, which are:\n"), argv[1]);
-       else
-               fprintf(stderr, _("fatal: submodule--helper subcommand must be "
-                                 "called with a subcommand, which are:\n"));
-
-       for (i = 0; i < ARRAY_SIZE(commands); i++)
-               fprintf(stderr, "\t%s\n", commands[i].cmd);
+                       return commands[i].fn(argc - 1, argv + 1, prefix);
 
-       exit(129);
+       die(_("fatal: '%s' is not a valid submodule--helper "
+             "subcommand"), argv[1]);
 }

-- 
2.5.0.256.g89f8063.dirty

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