The metavar overrides the default of displaying the choices, so we have to explicitly display them.

wyattscarpenter · wyattscarpenter · commit 2a8a8e24f464 · 2025-05-11T14:38:25.000-07:00
diff --git a/mypy/main.py b/mypy/main.py
@@ -573,7 +573,8 @@ def add_invertible_flag(
         "-O",
         "--output",
         metavar="FORMAT",
-        help="Set a custom output format",
+        # The metavar overrides the default of displaying the choices, so we have to explicitly display them.
+        help=f"Set a custom output format (choices: {set(OUTPUT_CHOICES.keys())})",
         choices=OUTPUT_CHOICES,
     )
 

Original file line number	Diff line number	Diff line change
`@@ -573,7 +573,8 @@ def add_invertible_flag(`
`573`	`573`	`"-O",`
`574`	`574`	`"--output",`
`575`	`575`	`metavar="FORMAT",`
`576`		`- help="Set a custom output format",`
	`576`	`+ # The metavar overrides the default of displaying the choices, so we have to explicitly display them.`
	`577`	`+ help=f"Set a custom output format (choices: {set(OUTPUT_CHOICES.keys())})",`
`577`	`578`	`choices=OUTPUT_CHOICES,`
`578`	`579`	`)`
`579`	`580`