Make --verbose output on a single line (#272):

See #269 (comment)

refurb/loader.py

@@ -183,9 +183,12 @@ def load_checks(settings: Settings) -> defaultdict[type[Node], list[Check]]:
             enabled_errors.add(str(ErrorCode.from_error(error)))
 
     if settings.verbose:
-        print("Enabled checks:")
+        msg = (
+            ", ".join(sorted(enabled_errors))
+            if enabled_errors
+            else "No checks enabled"
+        )
 
-        for code in sorted(enabled_errors):
-            print(code)
+        print(f"Enabled checks: {msg}\n")
 
     return found

test/test_main.py

@@ -251,14 +251,22 @@ def test_verbose_flag_prints_all_enabled_checks() -> None:
     with patch("builtins.print") as p:
         main(["test/data/err_100.py", "--verbose", "--enable-all"])
 
+    stdout = "\n".join(args[0][0] for args in p.call_args_list)
+
     # Current number of checks at time of writing. This number doesn't need to
     # be kept updated, it is only set to a known value to verify that it is
     # doing what it should.
     current_check_count = 76
 
-    assert p.call_count > current_check_count
+    for error_id in range(100, 100 + current_check_count):
+        assert f"FURB{error_id}" in stdout
+
+
+def test_verbose_flag_prints_message_when_all_checks_disabled() -> None:
+    with patch("builtins.print") as p:
+        main(["test/data/err_100.py", "--verbose", "--disable-all"])
 
     stdout = "\n".join(args[0][0] for args in p.call_args_list)
 
-    for error_id in range(100, 100 + current_check_count):
-        assert f"FURB{error_id}" in stdout
+    assert "FURB100" not in stdout
+    assert "No checks enabled" in stdout