Added inspect() command

src/core/sheerka/services/SheerkaFilter.py

@@ -296,8 +296,8 @@ class SheerkaFilter(BaseService):
     #             s.send(data)
 
     @staticmethod
-    def pipe_traverse(args):
+    def pipe_traverse(iterable):
-        for arg in args:
+        for arg in iterable:
             try:
                 if isinstance(arg, str):
                     yield arg
@@ -342,7 +342,7 @@ class SheerkaFilter(BaseService):
             yield item
 
     @staticmethod
-    def pipe_write(iterable, fname, glue="\n"):
+    def pipe_to_file(iterable, fname, glue="\n"):
         with open(fname, "w") as f:
             for item in iterable:
                 f.write(str(item) + glue)
@@ -432,3 +432,13 @@ class SheerkaFilter(BaseService):
                     yield item
             except NameError:
                 pass
+
+    def pipe_inspect(self, iterable, path, when=None):
+        compiled = self.get_compiled("inspect", path)
+        for item in iterable:
+            try:
+                context = {} if is_primitive(item) else as_bag(item)
+                context["self"] = item
+                yield eval(compiled, context)
+            except Exception as ex:
+                yield ex

tests/core/test_SheerkaFilter.py

@@ -211,3 +211,19 @@ class TestSheerkaFilter(TestUsingMemoryBasedSheerka):
         assert isinstance(format_instructions, FormatInstructions)
         assert format_instructions.recursive_props["children"] == 10
         assert format_instructions.recursive_props["other_prop"] == 15
+
+    def test_i_can_inspect_obj(self):
+        filter_service = SheerkaFilter(None)
+
+        lst = [Obj("a", "b"), Obj("c", "d")]
+        res = lst | Pipe(filter_service.pipe_inspect)("prop2")
+
+        assert list(res) == ["b", "d"]
+
+    def test_i_can_inspect_obj_with_bag(self):
+        filter_service = SheerkaFilter(None)
+
+        lst = [ObjWithAsBag("a", "b"), ObjWithAsBag("c", "d")]
+        res = lst | Pipe(filter_service.pipe_inspect)("second_prop")
+
+        assert list(res) == ["b", "d"]