feat: add support for script files, Python and Julia (py|jl)

.travis.yml

@@ -18,13 +18,14 @@ before_install:
   - conda config --set always_yes yes --set changeps1 no
   - conda update -q conda
   - conda info -a
-  - conda create -q -n test-environment -c conda-forge python=$PYTHON_VERSION jupyter_server==0.1.0 jupyterlab_pygments==0.1.0 pytest==3.10.1 nbconvert=5.5 pytest-cov nodejs flake8 ipywidgets matplotlib
+  - conda create -q -n test-environment -c conda-forge python=$PYTHON_VERSION jupyter_server==0.1.0 jupyterlab_pygments==0.1.0 pytest==3.10.1 nbconvert=5.5 pytest-cov nodejs flake8 ipywidgets matplotlib julia
   - source activate test-environment
+  - julia -e 'using Pkg; Pkg.add("IJulia")'
 install:
   - pip install ".[test]"
   - cd tests/test_template; pip install .; cd ../../;
 before_script:
   - flake8 voila tests setup.py
 script:
-  - VOILA_TEST_DEBUG=1 py.test tests/ --async-test-timeout=20
+  - VOILA_TEST_DEBUG=1 VOILA_TEST_JULIA=1 py.test tests/ --async-test-timeout=20
   - voila --help  # Making sure we can run `voila --help`

tests/app/serve_directory_test.py

@@ -1,15 +1,44 @@
-# test serving a notebook
+# test serving a notebook or python/julia file
+import os
 import pytest
 
+TEST_JULIA = os.environ.get('VOILA_TEST_JULIA', '') == '1'
+
 
 @pytest.fixture
 def voila_args(notebook_directory, voila_args_extra):
     return ['--VoilaTest.root_dir=%r' % notebook_directory, '--VoilaTest.log_level=DEBUG'] + voila_args_extra
 
 
 @pytest.mark.gen_test
-def test_hello_world(http_client, print_notebook_url):
+def test_print(http_client, print_notebook_url):
     print(print_notebook_url)
     response = yield http_client.fetch(print_notebook_url)
     assert response.code == 200
     assert 'Hi Voila' in response.body.decode('utf-8')
+
+
+@pytest.mark.gen_test
+def test_print_py(http_client, print_notebook_url):
+    print(print_notebook_url)
+    response = yield http_client.fetch(print_notebook_url.replace('ipynb', 'py'))
+    assert response.code == 200
+    assert 'Hi Voila' in response.body.decode('utf-8')
+
+
+@pytest.mark.skipif(not TEST_JULIA, reason='testing julia is slow and requires external dependencies')
+@pytest.mark.gen_test
+def test_print_julia(http_client, print_notebook_url):
+    print(print_notebook_url)
+    response = yield http_client.fetch(print_notebook_url.replace('ipynb', 'jl'))
+    assert response.code == 200
+    assert 'Hi Voila, from Julia' in response.body.decode('utf-8')
+
+
+@pytest.mark.skipif(not TEST_JULIA, reason='testing julia is slow and requires external dependencies')
+@pytest.mark.gen_test
+def test_print_julia_notebook(http_client, print_notebook_url):
+    print(print_notebook_url)
+    response = yield http_client.fetch(print_notebook_url.replace('.ipynb', '_julia.ipynb'))
+    assert response.code == 200
+    assert 'Hi Voila, from Julia' in response.body.decode('utf-8')

tests/notebooks/print.jl

@@ -0,0 +1,15 @@
+# ---
+# jupyter:
+#   jupytext:
+#     text_representation:
+#       extension: .jl
+#       format_name: light
+#       format_version: '1.4'
+#       jupytext_version: 1.2.1
+#   kernelspec:
+#     display_name: Julia 1.0.3
+#     language: julia
+#     name: julia-1.0
+# ---
+
+print("Hi Voila, from Julia")

tests/notebooks/print.py

@@ -0,0 +1,15 @@
+# ---
+# jupyter:
+#   jupytext:
+#     text_representation:
+#       extension: .py
+#       format_name: light
+#       format_version: '1.4'
+#       jupytext_version: 1.2.1
+#   kernelspec:
+#     display_name: Python 3
+#     language: python
+#     name: python
+# ---
+
+print('Hi Voila!')

tests/notebooks/print_julia.ipynb

@@ -0,0 +1,28 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "print(\"Hi Voila, from Julia!\")"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Julia 1.0.3",
+   "language": "julia",
+   "name": "julia-1.0"
+  },
+  "language_info": {
+   "file_extension": ".jl",
+   "mimetype": "application/julia",
+   "name": "julia",
+   "version": "1.0.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

voila/handler.py

@@ -102,6 +102,12 @@ def load_notebook(self, path):
             notebook = model['content']
             notebook = yield self.fix_notebook(notebook)
             raise tornado.gen.Return(notebook)  # TODO py2: replace by return
+        elif model['mimetype'] == 'text/x-python' or model.get('path', '').endswith('.py'):
+            notebook = yield self.create_notebook(model, language='python')
+            raise tornado.gen.Return(notebook)  # TODO py2: replace by return
+        elif model.get('path', '').endswith('.jl'):
+            notebook = yield self.create_notebook(model, language='julia')
+            raise tornado.gen.Return(notebook)  # TODO py2: replace by return
         else:
             raise tornado.web.HTTPError(500, 'file not supported')
 
@@ -130,6 +136,23 @@ def fix_notebook(self, notebook):
         notebook.metadata.kernelspec.language = all_kernel_specs[kernel_name]['spec']['language']
         raise tornado.gen.Return(notebook)  # TODO py2: replace by return
 
+    @tornado.gen.coroutine
+    def create_notebook(self, model, language):
+        all_kernel_specs = yield tornado.gen.maybe_future(self.kernel_spec_manager.get_all_specs())
+        kernel_name = yield self.find_kernel_name_for_language(language, kernel_specs=all_kernel_specs)
+        spec = all_kernel_specs[kernel_name]
+        nb = nbformat.v4.new_notebook(
+            metadata={
+                'kernelspec': {
+                    'display_name': spec['spec']['display_name'],
+                    'language': spec['spec']['language'],
+                    'name': kernel_name
+                }
+            },
+            cells=[nbformat.v4.new_code_cell(model['content'])],
+        )
+        return nb
+
     @tornado.gen.coroutine
     def find_kernel_name_for_language(self, kernel_language, kernel_specs=None):
         """Finds a best matching kernel name given a kernel language.

voila/paths.py

@@ -16,7 +16,7 @@
 # if the directory above us contains the following paths, it means we are installed in dev mode (pip install -e .)
 DEV_MODE = os.path.exists(os.path.join(ROOT, '../setup.py')) and os.path.exists(os.path.join(ROOT, '../share'))
 
-notebook_path_regex = r'(.*\.ipynb)'
+notebook_path_regex = r'(.*\.(?:ipynb|py|jl))'
 
 
 def collect_template_paths(