Allow a callable default to have its own string representation

As it was before 78a62b37c956e71b32689a0d5c75a684aa9ab56d.

A callable can also be an object with __call__ and __str__ defined, in
which case it makes sense to use it. Don't try too hard to show something
else instead, because the developer most likely knows what he (or she) is
doing.

https://github.com/pallets/click/issues/2099

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/test_options.py b/tests/test_options.py
index 2e34337..90616b7 100644
--- a/tests/test_options.py
+++ b/tests/test_options.py
@@ -305,6 +305,19 @@ def test_dynamic_default_help_text(runner):
     assert "(current user)" in result.output
 
 
+def test_dynamic_default_help_special_method(runner):
+    class Value:
+        def __call__(self):
+            return 42
+
+        def __str__(self):
+            return "special value"
+
+    opt = click.Option(["-a"], default=Value(), show_default=True)
+    ctx = click.Context(click.Command("cli"))
+    assert "special value" in opt.get_help_record(ctx)[1]
+
+
 @pytest.mark.parametrize(
     ("type", "expect"),
     [