[bugfix] Properly dump json_formatter with --show-config option

reframe/core/config.py

@@ -17,6 +17,7 @@
 import reframe
 import reframe.core.settings as settings
 import reframe.utility as util
+import reframe.utility.jsonext as jsonext
 from reframe.core.environments import normalize_module_list
 from reframe.core.exceptions import ConfigError, ReframeFatalError
 from reframe.core.logging import getlogger
@@ -225,7 +226,7 @@ def __repr__(self):
                 f'sources={self._sources!r})')
 
     def __str__(self):
-        return json.dumps(self._pick_config(), indent=2)
+        return jsonext.dumps(self._pick_config(), indent=2)
 
     # Delegate everything to either the original config or to the reduced one
     # if a system is selected

reframe/frontend/cli.py

@@ -831,7 +831,7 @@ def restrict_logging():
                     f'no such configuration parameter found: {config_param}'
                 )
             else:
-                printer.info(json.dumps(value, indent=2))
+                printer.info(jsonext.dumps(value, indent=2))
 
         sys.exit(0)
 

reframe/utility/jsonext.py

@@ -66,6 +66,9 @@ def encode(obj, **kwargs):
     if inspect.istraceback(obj):
         return traceback.format_tb(obj)
 
+    if inspect.isfunction(obj):
+        return f'py::{obj.__qualname__}'
+
     newobj = encode_dict(obj)
     if newobj is not None:
         return newobj

unittests/test_utility.py

@@ -1585,6 +1585,12 @@ def test_jsonext_dumps():
     )
     assert '{"(1, 2, 3)": 1}' == jsonext.dumps({(1, 2, 3): 1})
 
+    def foo():
+        pass
+
+    assert ('{"fn": "py::test_jsonext_dumps.<locals>.foo"}' ==
+            jsonext.dumps({'fn': foo}))
+
 
 # Classes to test JSON deserialization