Make $outputpath an error if it occurs in a filename (fix #30)

Author: Alistair Turnbull

nancy/__init__.py

@@ -458,10 +458,7 @@ def outputpath(self, args: Optional[list[bytes]], input: Optional[bytes]) -> byt
             raise ValueError("$outputpath does not take arguments")
         if input is not None:
             raise ValueError("$outputpath does not take an input")
-        try:
-            return bytes(self._expand.output_file())
-        except ValueError:
-            return b""
+        return bytes(self._expand.output_file())
 
     def expand(self, args: Optional[list[bytes]], input: Optional[bytes]) -> bytes:
         if args is not None:

tests/test_nancy.py

@@ -134,7 +134,10 @@ def test_path_in_filename() -> None:
 
 def test_outputpath_in_filename() -> None:
     with chdir(tests_dir):
-        passing_test(["outputpath-in-filename-src"], "outputpath-in-filename-expected")
+        failing_test(
+            ["outputpath-in-filename-src"],
+            "$outputfile is not available while expanding the filename",
+        )
 
 
 def test_realpath_in_dirname_gives_an_error() -> None: