+ if (file->mode == GIT_FILEMODE_COMMIT)
+ {
+ git_buf content = GIT_BUF_INIT;
+ git_submodule* sm = NULL;
+ const git_oid* sm_head = NULL;
+ unsigned int sm_status = 0;
+ const char* sm_status_text = "";
+ char oidstr[GIT_OID_HEXSZ+1];
+
+ if ((error = git_submodule_lookup(&sm, ctxt->repo, file->path)) < 0) {
+ return error;
+ }
+
+ if ((sm_head = git_submodule_head_oid(sm)) == NULL) {
+ giterr_set(GITERR_SUBMODULE, "Cannot find head of submodule '%s'", file->path);
+ return -1;
+ }
+
+ if ((error = git_submodule_status(&sm_status, sm)) < 0) {
+ return -1;
+ }
+ if (!GIT_SUBMODULE_STATUS_IS_UNMODIFIED(sm_status)) {
+ sm_status_text = "-dirty";
+ }
+
+ git_oid_fmt(oidstr, sm_head);
+ oidstr[GIT_OID_HEXSZ] = 0;
+ git_buf_printf(&content, "Subproject commit %s%s\n", oidstr, sm_status_text );
+
+ map->data = git_buf_detach(&content);
+ map->len = strlen(map->data);
+
+ file->flags |= GIT_DIFF_FILE_FREE_DATA;
+
+ return 0;
+ }
+