Merge pull request #43 from kryskool/kryskool/unknow-cmd-better

Display better error message on unknown command, and return code 1

cliff/app.py

@@ -257,7 +257,14 @@ class App(object):
         return 0
 
     def run_subcommand(self, argv):
-        subcommand = self.command_manager.find_command(argv)
+        try:
+            subcommand = self.command_manager.find_command(argv)
+        except ValueError as err:
+            if self.options.debug:
+                raise
+            else:
+                LOG.error(err)
+            return 2
         cmd_factory, cmd_name, sub_argv = subcommand
         cmd = cmd_factory(self, self.options)
         err = None

cliff/tests/test_app.py

@@ -374,3 +374,16 @@ def test_error_encoding_sys():
                 app.stderr.write(u_data)
                 actual = stderr.getvalue()
                 assert data == actual
+
+
+def test_unknown_cmd():
+    app, command = make_app()
+    assert app.run(['hell']) == 2
+
+
+def test_unknown_cmd_debug():
+    app, command = make_app()
+    try:
+        app.run(['--debug', 'hell']) == 2
+    except ValueError as err:
+        assert "['hell']" in ('%s' % err)