feat: error for more than one file with compression to stdout

Author: aabiddanda

CHANGELOG.rst

@@ -1,5 +1,11 @@
 --------------------
-[0.2.1] - 2021-01-26
+[0.2.2] - 2022-02-22
+--------------------
+
+- Support compressing to stdout (aabiddanda, #53, #64)
+
+--------------------
+[0.2.1] - 2022-01-26
 --------------------
 
 - Fix for `time_units` in tskit 0.4.0 (benjeffery, #54, #55)

tests/test_cli.py

@@ -312,6 +312,17 @@ def test_compress_stdout_correct(self):
         ts = tszip.decompress(str(tmp_file))
         self.assertEqual(ts.tables, self.ts.tables)
 
+    def test_compress_stdout_multiple(self):
+        self.assertTrue(self.trees_path.exists())
+        with mock.patch("tszip.cli.exit", side_effect=TestException) as mocked_exit:
+            with self.assertRaises(TestException):
+                self.run_tszip_stdout(
+                    ["-c", str(self.trees_path), str(self.trees_path)]
+                )
+            mocked_exit.assert_called_once_with(
+                "Only one file can be compressed on with '-c'"
+            )
+
 
 class DecompressSemanticsMixin:
     """

tszip/cli.py

@@ -111,6 +111,8 @@ def run_compress(args):
     if args.stdout:
         args.keep = True
     setup_logging(args)
+    if args.stdout and len(args.files) > 1:
+        exit("Only one file can be compressed on with '-c'")
     for file_arg in args.files:
         logger.info(f"Compressing {file_arg}")
         try: