Hide default value when show_default is False

CHANGES.rst

@@ -34,6 +34,7 @@ Unreleased
 -   Show the ``types.ParamType.name`` for ``types.Choice`` options within
     ``--help`` message if ``show_choices=False`` is specified.
     :issue:`2356`
+-   Do not display values in prompts when `show_default=False` on Options
 
 
 Version 8.1.8

src/click/core.py

@@ -2803,6 +2803,7 @@ def prompt_for_value(self, ctx: Context) -> t.Any:
             show_choices=self.show_choices,
             confirmation_prompt=self.confirmation_prompt,
             value_proc=lambda x: self.process_value(ctx, x),
+            show_default=(False if self.show_default is False else True),
         )
 
     def resolve_envvar_value(self, ctx: Context) -> str | None:

tests/test_termui.py

@@ -447,3 +447,13 @@ def cli(password):
 
     if prompt == "Confirm Password":
         assert "Confirm Password: " in result.output
+
+
+def test_show_default_false_hides_prompt(runner):
+    @click.command()
+    @click.option("--arg1", show_default=False, prompt=True, default="my-default-value")
+    def cmd(arg1):
+        pass
+
+    result = runner.invoke(cmd, input="my-input", standalone_mode=False)
+    assert "my-default-value" not in result.output