Add SubmissionExporter to turn exam into HTML with hashcode and times…

…tamp

e2xgrader/exporters/__init__.py

@@ -1,7 +1,5 @@
 from .exporter import E2xExporter
 from .gradeexporter import GradeExporter
+from .submissionexporter import SubmissionExporter
 
-__all__ = [
-    "E2xExporter",
-    "GradeExporter",
-]
+__all__ = ["E2xExporter", "GradeExporter", "SubmissionExporter"]

e2xgrader/exporters/submissionexporter.py

@@ -0,0 +1,63 @@
+import os
+from textwrap import dedent
+
+from nbformat.v4 import new_markdown_cell
+from traitlets import Unicode
+
+from .exporter import E2xExporter
+
+
+class SubmissionExporter(E2xExporter):
+    """
+    Exporter class for generating HTML submission files from a Jupyter notebook exam.
+    """
+
+    hashcode_cell_template_name = Unicode(
+        "hashcode_cell.html", help="The name of the hashcode cell template."
+    ).tag(config=True)
+
+    exam_submitted_message = Unicode(
+        "We have received your exam!",
+        help="The message to display in the hashcode cell when the exam has been submitted.",
+    ).tag(config=True)
+
+    verify_exam_message = Unicode(
+        "Verify your exam below and then close the browser and shut down your computer.",
+        help=dedent(
+            """
+            The message to display in the hashcode cell telling the student to verify their exam.
+            """
+        ),
+    ).tag(config=True)
+
+    your_hashcode_message = Unicode(
+        "Your hashcode:",
+        help="The message to display in the hashcode cell before the hashcode.",
+    ).tag(config=True)
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.template_name = "form"
+
+    @property
+    def template_paths(self):
+        return super().template_paths + [
+            os.path.join(os.path.dirname(__file__), "templates")
+        ]
+
+    def from_notebook_node(self, nb, resources=None, **kw):
+        hashcode_template = self.environment.get_template(
+            self.hashcode_cell_template_name
+        )
+        hashcode_cell = new_markdown_cell(
+            source=hashcode_template.render(
+                hashcode=resources["hashcode"],
+                timestamp=resources["timestamp"],
+                exam_submitted_message=self.exam_submitted_message,
+                verify_exam_message=self.verify_exam_message,
+                your_hashcode_message=self.your_hashcode_message,
+            ).replace("\n", ""),
+            metadata={"name": "exam-submitted"},
+        )
+        nb.cells = [hashcode_cell] + nb.cells
+        return super().from_notebook_node(nb, resources=resources, **kw)