🐛 Ensure that an envvar set for a typer.Option list is split on whitespace

tests/test_others.py

@@ -325,7 +325,7 @@ def main(
     assert "[]" in result.output
 
 
-def test_option_uses_envvar_when_required():
+def test_option_envvar():
     app = typer.Typer()
 
     @app.command()
@@ -337,6 +337,20 @@ def main(user: Annotated[str, typer.Option(envvar="ME")]):
     assert "Hello rick" in result.output
 
 
+def test_option_envvar_list():
+    app = typer.Typer()
+
+    @app.command()
+    def main(users: Annotated[list[str], typer.Option(envvar="ME")]):
+        for u in users:
+            print(f"Hello {u}")
+
+    result = runner.invoke(app, env={"ME": "rick morty"})
+    assert result.exit_code == 0
+    assert "Hello rick" in result.output
+    assert "Hello morty" in result.output
+
+
 def test_completion_argument():
     file_path = Path(__file__).parent / "assets/completion_argument.py"
     result = subprocess.run(

typer/core.py

@@ -667,11 +667,16 @@ def prompt_for_value(self, ctx: _click.Context) -> Any:
         )
 
     def value_from_envvar(self, ctx: _click.Context) -> Any:
+        # TODO: clean up
         rv = self.resolve_envvar_value(ctx)
 
         # Absent environment variable or an empty string is interpreted as unset.
         if rv is None:
             return None
+
+        if self.nargs != 1 or self.multiple:
+            return self.type.split_envvar_value(rv)
+
         return rv
 
     def resolve_envvar_value(self, ctx: _click.Context) -> str | None: