fix using old mach

source/cell.c

@@ -284,6 +284,7 @@ static void print_usage(const char *prog)
   printf("  --shop <path>              Set shop path (overrides CELL_SHOP)\n");
   printf("  --emit-qbe                 Emit QBE IL (for native compilation)\n");
   printf("  --dump-mach                Dump MACH bytecode disassembly\n");
+  printf("  --dev                      Dev mode (shop=.cell, core=.)\n");
   printf("  --test [heap_size]         Run C test suite\n");
   printf("  -h, --help                 Show this help message\n");
   printf("\nEnvironment:\n");
@@ -346,6 +347,17 @@ int cell_init(int argc, char **argv)
       }
       core_override = argv[arg_start + 1];
       arg_start += 2;
+    } else if (strcmp(argv[arg_start], "--dev") == 0) {
+      shop_override = ".cell";
+      core_override = ".";
+      mkdir(".cell", 0755);
+      mkdir(".cell/build", 0755);
+      mkdir(".cell/packages", 0755);
+      /* Ensure .cell/packages/core -> . symlink exists */
+      struct stat lst;
+      if (lstat(".cell/packages/core", &lst) != 0)
+        symlink("../..", ".cell/packages/core");
+      arg_start++;
     } else {
       break;
     }