py: Pretend frozen files are stored under .frozen rather than the empty path.

This makes it clear when frozen modules are loaded as opposed to the empty path
which represents the current working directory. Furthermore, by splitting the two
apart this allows one to control in what order frozen modules are loaded.

This is a prerequisite for #56.

1 files changed, 5 insertions, 2 deletions

diff --git a/unix/main.c b/unix/main.c
index 633144c86..e96cdaaa2 100644
--- a/unix/main.c
+++ b/unix/main.c
@@ -453,7 +453,9 @@ MP_NOINLINE int main_(int argc, char **argv) {
         path = "~/.micropython/lib:/usr/lib/micropython";
         #endif
     }
-    size_t path_num = 1; // [0] is for current dir (or base dir of the script)
+    size_t path_num = 2; // [0] is for current dir (or base dir of the script)
+                         // [1] is for frozen files.
+    size_t builtin_path_count = path_num;
     if (*path == ':') {
         path_num++;
     }
@@ -467,9 +469,10 @@ MP_NOINLINE int main_(int argc, char **argv) {
     mp_obj_t *path_items;
     mp_obj_list_get(mp_sys_path, &path_num, &path_items);
     path_items[0] = MP_OBJ_NEW_QSTR(MP_QSTR_);
+    path_items[1] = MP_OBJ_NEW_QSTR(MP_QSTR__dot_frozen);
     {
     char *p = path;
-    for (mp_uint_t i = 1; i < path_num; i++) {
+    for (mp_uint_t i = builtin_path_count; i < path_num; i++) {
         char *p1 = strchr(p, PATHLIST_SEP_CHAR);
         if (p1 == NULL) {
             p1 = p + strlen(p);