blackd: show default values for options (#3712)

* blackd: show default values for options

Reference: https://click.palletsprojects.com/en/8.1.x/api/#click.Option

* Fix spacing in CHANGES.md

diff --git a/CHANGES.md b/CHANGES.md
index 6a9923f8d8d381b8e4682581a3ae35f2de6c8ebf..762a799a1d10d06c139fe99c724aed0e6f35f0e0 100644 (file)
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -44,6 +44,9 @@
 
 <!-- Changes to blackd -->
 
+- The `blackd` argument parser now shows the default values for options in their help
+  text (#3712)
+
 ### Integrations
 
 <!-- For example, Docker, GitHub Actions, pre-commit, editors -->

diff --git a/src/blackd/__init__.py b/src/blackd/__init__.py
index ba4750b829836d803bea2e285c785b9e4094b9cb..d331ad000bc94e808e2d0ad23acd121f6eb505e3 100644 (file)
--- a/src/blackd/__init__.py
+++ b/src/blackd/__init__.py
@@ -59,9 +59,15 @@ class InvalidVariantHeader(Exception):
 
 @click.command(context_settings={"help_option_names": ["-h", "--help"]})
 @click.option(
-    "--bind-host", type=str, help="Address to bind the server to.", default="localhost"
+    "--bind-host",
+    type=str,
+    help="Address to bind the server to.",
+    default="localhost",
+    show_default=True,
+)
+@click.option(
+    "--bind-port", type=int, help="Port to listen on", default=45484, show_default=True
 )
-@click.option("--bind-port", type=int, help="Port to listen on", default=45484)
 @click.version_option(version=black.__version__)
 def main(bind_host: str, bind_port: int) -> None:
     logging.basicConfig(level=logging.INFO)