added exit status 255 when no data

src/arctic3d/cli.py

@@ -153,12 +153,12 @@ def cli(arguments, main_func):
 
     """
     cmd = load_args(arguments)
-    main_func(**vars(cmd))
+    return main_func(**vars(cmd))
 
 
 def maincli():
     """Execute main client."""
-    cli(argument_parser, main)
+    return cli(argument_parser, main)
 
 
 def main(
@@ -317,6 +317,10 @@ def main(
         f"arctic3d run completed in {(time.time() - st_time):.2f} seconds."
     )
 
+    # check if there's at least one interface
+    if Path(run_dir_path, "clustered_interfaces.out").is_file() is False:
+        return 255
+
 
 if __name__ == "__main__":
     sys.exit(maincli())

tests/test_cli.py

@@ -8,7 +8,7 @@ def test_cli_empty():
     """Test main cli with uniprot ID with no interfaces."""
     target_uniprot = "P23804"
     start_cwd = os.getcwd()
-    main(
+    exit_code = main(
         input_arg=target_uniprot,
         db=None,
         interface_file=None,
@@ -25,6 +25,8 @@ def test_cli_empty():
         threshold=None,
         min_clust_size=None,
     )
+    # assert exit code
+    assert exit_code == 255
     os.chdir(start_cwd)
     exp_dir = Path(f"arctic3d-{target_uniprot}")
     assert exp_dir.exists() is True