add data magic command

cwlkernel/CWLKernel.py

@@ -26,7 +26,7 @@ class CWLKernel(Kernel):
     }
     banner = "Common Workflow Language"
 
-    _magic_commands = frozenset(['logs'])
+    _magic_commands = frozenset(['logs', 'data'])
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
@@ -132,6 +132,25 @@ def _execute_magic_logs(self, limit=None):
             }
         )
 
+    def _execute_magic_data(self, *args):
+        data = "<ul>\n" + '\n'.join(
+            [f'\t<li><a href="file://{d}" target="_empty">{d}</a></li>' for d in self.get_past_results()]) + "\n</ul>"
+        self.send_response(
+            self.iopub_socket,
+            'display_data',
+            {
+                'data': {
+                    'text/html': data
+                },
+                'metadata': {
+                    'application/json': {
+                        'expanded': False,
+                        'root': 'root'
+                    }
+                }
+            }
+        )
+
     def _accumulate_data(self, code: str):
         cwl = self._cwl_executor.file_manager.get_files_uri().path
         self._cwl_executor.validate_input_files(yaml.load(code, Loader=yaml.Loader), cwl)

tests/test_CWLKernel.py

@@ -7,6 +7,8 @@
 
 from ruamel import yaml
 
+from cwlkernel.CWLKernel import CWLKernel
+
 
 class TestCWLKernel(unittest.TestCase):
     data_directory: str
@@ -185,6 +187,13 @@ def test_handle_input_data_files(self):
         os.chdir(tmp_dir)
         data['example_file']['path'] = os.path.basename(data['example_file']['path'])
 
+    def test_all_magic_commands_have_methods(self):
+        kernel = CWLKernel()
+        for magic in kernel._magic_commands:
+            try:
+                kernel.__getattribute__(f'_execute_magic_{magic}')
+            except AttributeError as e:
+                self.fail(f'Missing function for magic command: {magic}. \nAttribute error raises: {e}')
 
 
 if __name__ == '__main__':