Invalid notebooks may cause a warning, but not a fatal error

Fixes #234

HISTORY.rst

@@ -3,6 +3,15 @@
 Release History
 ---------------
 
+1.1.4 (2019-05-25)
+++++++++++++++++++++++
+
+**Improvements**
+
+**BugFixes**
+- Invalid notebooks may cause a warning, but not a fatal error (#234)
+
+
 1.1.3 (2019-05-22)
 ++++++++++++++++++++++
 

jupytext/jupytext.py

@@ -104,10 +104,19 @@ def writes(self, nb, metadata=None, **kwargs):
                 else:
                     cells.append(NotebookNode(source=cell.source, metadata=cell_metadata, cell_type=cell.cell_type))
 
-            return notebook_to_md(new_notebook(metadata=metadata, cells=cells))
+            return notebook_to_md(NotebookNode(
+                nbformat=nb.nbformat,
+                nbformat_minor=nb.nbformat_minor,
+                metadata=metadata,
+                cells=cells))
 
         # Copy the notebook, in order to be sure we do not modify the original notebook
-        nb = new_notebook(cells=nb.cells, metadata=deepcopy(metadata or nb.metadata))
+        nb = NotebookNode(
+            nbformat=nb.nbformat,
+            nbformat_minor=nb.nbformat_minor,
+            metadata=deepcopy(metadata or nb.metadata),
+            cells=nb.cells)
+
         metadata = nb.metadata
         default_language = default_language_from_metadata_and_ext(metadata, self.implementation.extension)
         self.update_fmt_with_notebook_options(nb.metadata)
@@ -250,7 +259,12 @@ def writes(notebook, fmt, version=nbformat.NO_CONVERT, **kwargs):
         jupytext_metadata.pop('text_representation', {})
         if not jupytext_metadata:
             metadata.pop('jupytext', {})
-        return nbformat.writes(new_notebook(cells=notebook.cells, metadata=metadata), version, **kwargs)
+        return nbformat.writes(
+            NotebookNode(
+                nbformat=notebook.nbformat,
+                nbformat_minor=notebook.nbformat_minor,
+                metadata=metadata,
+                cells=notebook.cells), version, **kwargs)
 
     if not format_name:
         format_name = format_name_for_ext(metadata, ext, explicit_default=False)

tests/notebooks/ipynb_R/R notebook with invalid cell keys.ipynb

@@ -0,0 +1,55 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {},
+     "metadata": {},
+     "output_type": "display_data"
+    },
+    {
+     "data": {
+      "image/png": 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gHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUgNNpjVcDqWeb3xRqKG\nRtORoKWxqKF8OjTzb+4779xqr07+tv5Soc5QQxWy/33OomLUUFoIGhrORw2lYyfiIR3PajAd\nzbzeeMMjUUPpUNDSaNhQenLm3/xK8rP/vtoFP6i/lD8RdKRCMWjoeNhQmg8aOhk1VPrTfSwe\nUvZ3UV7aGdV9abctud5f4qWdUZu/tMs+M5CMgOQEpJCA5AQkIyDFDAHJGQKSDkgxAckJSEAS\nAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEAS\nAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEAS\nAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEAS\nAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEASAckJSEAS\nAckJSEASNQvpa790/nhvfdvPnz9jbwLSeEAKaR5CWp+85tzx3nBunX72fn8SSEZAihlqI0ib\nxu/UfWnXUEAyAlLMEJCcISDpgBQTkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyA\nBCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyA\nBCQRkJyABCQRkJyABCQRkJyABCRRw5D+6T3vnNp5QGokIIU0HyA9k5wz7fOB/tXj49eB5ASk\nkOYHpFzmdSA5ASkkIDkByQhIMUNAcoaApANSTEByAhKQREByAhKQREByAhKQREByAhKQREBy\nAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByWpCQfpxJ\nZG/PZSvuL0482JEr93TtZSAZAamZOgnSq/77l/OnOdq3eNOB3d1bTkFaNlBqqPYykIyA1Eyd\nBGn5Tydv/pMf1kBaf13ppnfJ8ASk5ZmXgWQEpGbqJEjp4Y3vSM7+7YfHpum6p3TTn+ufgHTJ\n8qWr+067DCQjIDVTR0Eq9eT7X5f83Nrnq4+LuW2l24O5vvGHzzyy79mNue3TLt9xxRVXXDuW\nVT4tZF5vvELYUJqPWmp06PmkO3so7EjFoJ2xYhq1FDcU9Q+XDxtKCyMzQ0rTY1cmpW9LfdmQ\nKm24ctrltV1dXRedvkM1/Ti5vNVHoNgm31I4DdJLn/13yWtWfOC1Z31+4kLta7hS23NjvLTj\npZ3VwnxpV3jk8n+e/NrGI2l66L+8ZeJa7bsKpTYs580GIHktSEg3nZ+8+oqJ13D3nTVxsfw+\n92Pl97n7bjiZprfv7n/6ttxDUy4DyQ1IzdRJkJK33/LKqfvf/p+n7j3Vc+lVvcXyC7qjaXrX\nyu6lq/ZMvQwkNyA1UydB+no6+7LPDKQpAamZOglSM2WfGUhTAlIzASkkIDkByQhIMUNAcoaA\npANSTEByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREByAhKQREBy\nAhKQREByAhKQREByAhKQREByAhKQRAakP7twau8GUhMBKaTOhPQfkun9j8yvApITkELqUEhn\n75/ageyvApITkELqVEjOEJCcgBQSkJyAZASkmCEgOUNA0gEpJiA5AQlIIiA5AQlIIiA5AQlI\nIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlI\nIiA5AQlIIiA5AQlIIiA5AQlIIiA5AQlIotMgfav74preACQgAUl0GqRbktP6eWcISE5ACqkT\nIH0m+dT+mv7RGQKSE5BC6gxIG2c1BCQnIIUEJCcgGQEpZghIzhCQdECKCUhOQAKSCEhOQAKS\nCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKS\nCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKSCEhOQAKS6BSkF66e+MygdwDp9IAEJNEpSLuqnxl0\n1oOzGgKSE5BCamNIjyS/93/H+87shoDkBKSQ2hrSNc0NAckJSCEByQlIRkCKGQKSMwQkHZBi\nApITkIAkApITkIAkApITkIAkApITkIAkApITkIAkApITkIAkApITkIAkApITkIAkApITkIAk\nApITkIAkApITkIAkApITkIAkApITkIAkApITkIAkApITkIAkApITkBrsUFbH0uHM6413Yiho\n6GR6oumNTX9Q7n0rKr/8wXuTDzQ3N5IebfpI440dCRrKF4OGDhWihtKxoKGjo0FDx9KhV+Ih\njWY1lhYyrzdePmwozTe98eZkejc3N1dIx5o+0njFsKHsf5+zWYoaSqOWxsKG0sJwPKTs76Lz\n86Xdv37jo6W+8cSj4+15sbk5Xto5LZSXdtlnnqeQzivfnvZJq7MNSE5ACglITkAyAlLMEJCc\nISDpgNRsQPIDEpBmDEh+QALSjAHJD0hAmjEg+QEJSDMGJD8gAWnGgOQHJCDNGJD8gASkGQOS\nH5CANGNA8gMSkGYMSH5AAtKMAckPSECaMSD5AQlIMwYkPyABacaA5AckIM0YkPyABKQZA5If\nkBY6pAOre2bqdUCyA9JCh9SbzNyvlb8ASE5AWuiQvpC8/9GZ+m75C4DkBCQgrav/BUByAhKQ\ngBQQkIAEpICABCQgBQQkIAEpICABCUgBAQlIQAoISEACUkBAAhKQAgISkIAUEJCABKSAgAQk\nIAUEJCABKSAgAQlIAQEJSEAKCEhAAlJAQAISkAICEpCAFBCQgASkgIC0wCDdV/tRQe8FUkRA\nWmCQ/sXpnxX02fpLQHIC0gKDdO7PPVjT9oP1l4DkBKSFBukXG10CkhOQgCQCkhOQgCQCkhOQ\ngCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQ\ngCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQgCQCkhOQFgakx9dN9GogTR0C\nkg5IU1pU/cygdzW6BCQnIC0MSP85uXNzpb/4dqNLQHIC0kKB9KPZLgHJCUhAEgHJCUhAEgHJ\nCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJ\nCUhAEgHJCUhAEgHJCUhAEgHJCUjV9vZctuL+4sSDXR+9YsmHvla6syNX7mkgNR+QnDoe0r7F\nmw7s7t4y8egjvXufuzu3swRp2UCpISA1H5CcOh7S+utKN71LhqdcunFtCdLy6V+WfWYgGQHJ\nqeMhLb+ndNOf659yadWnS5AuWb50dR+QAgKSU6dDKua2lW4P5qaY2XXJ99L0mUf2Pbsxt738\n+Klt27btOJ7VYDqaeb3xhkeihtKh0u3zG28b75eSF2e7NDoUdKTR9GTQUuFE1FAxaOh42FCa\nDxo6ORY0VPrTfawZSHu6nzh1d8OV5du1XV1dF6md9urG6ocHnTPa6rNQ55av3mv8pd3O7m9W\nf297bqx0+51du3Y9cSyrk+lI5vXGGxoOGip9Ryrd9iRr7xvv67NeGhkMOtJoeiJoKX88aKhQ\nDBo6FjaU5oOGTowFDZX+dB9tAFLNmw0PLJl8yzvdMPmOQ/bL0Xb9GekPkx1NL/EzkhM/I52q\n/Pb3Y+W3v/tuOJmmd12yc2Bg4Edpevvu/qdvyz0EpOYDklPHQ0qf6rn0qt5i+XVc6RvZssp/\nh72mJGpl99JVeya/KvvMQDICklPnQ/LKPjOQjIDkBKSQgOQEJCMgxQwByRkCkg5IQJJDQNIB\nCUhyCEg6IAFJDgFJByQgySEg6YAEJDkEJB2QgCSHgKQDEpDkEJB0QAKSHAKSDkhAkkNA0gEJ\nSHIISDogAUkOAUkHJCDJISDpgAQkOQQkHZCAJIeApAMSkOQQkHRAApIcApIOSECSQ0DSAQlI\ncghIOiABSQ4BSQckIMkhIOmABCQ5BCQdkIAkh4CkAxKQ5BCQdEACkhwCkg5IQJJDQNIBCUhy\nCEg6IAFJDgFJByQgySEg6YAEJDkEJB2QgCSHgKQDEpDkEJB0QAKSHAKSDkhAkkNA0gEJSHII\nSDogAUkOAUm3sCG98vB9mzdv/i0g1R8Ckm5hQ/rzZLyvNb0EJCcgzVNIn02615Xa+FLTS0By\nAtK8hXR30BKQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAE\nJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAEJBGQnIAE\nJBGQnIAEJBGQnIA0zyB9ZfN4y4HkDAFJtyAh7Umq3RtzIiBZAWl+QdqZvHtdpZs/92LMiYBk\nBaT5BunaiaHKJ61GBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJ\nBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJBCQnIAFJ\nBCQnIAFJBCQnIAFJBCQnIM0DSN96sNp6IDU0BCTd3EAayyqfFjKvN15hNkNvSqa0amIozUcd\nKWwo7EjFoJ2xYva/z1kUNxT1D5cPG0oLI/GQXs7qSDqUeb3xjg/O4i8654091T78rfFrJ9Lj\nQUcaOhY0NJweDloaOxQ0lC8GDb1ciBpKR4OGDo8EDZX/dMdDyv4u2tqXduf8esYQL+2cIV7a\n6RbOz0hAmvUQkHRAiglITkACkghITkACkghITkACkghITkACkghITkACkghITkACkghITkAC\nkghITkACkghITkACkghITkACkghITkACkghITkACkghITkACkghITkACkghITkACkghITkAC\nkghITkDqDEh9j9YJSLMeApJuPkF6OKnbuzKGgOQMAUk3nyBtTv7jlTN31RczhoDkDAFJN78g\n3dToEJCcISDpgBQTkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQR\nkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQRkJyABCQR\nkJyABCQRkJyAFA6p7gf+qPZk/9XrgDQ1IBl1OqRb63/gz2z7RIP/9ECyhoCkaxGktcmiOh/4\no1pxdfb1q7/d4D89kKwhIOlaBmlLE4ee1SetZg4ByRkCkg5IMQHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhA\nEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUhAEgHJCUjV9vZctuL+4mmPpl8G\n0uwDklPHQ9q3eNOB3d1bah9NvwykJgKSU8dDWn9d6aZ3yXDNo+mXgdREQHLqeEjL7ynd9Of6\nax5NuTx4tNT3szpw6GD1/qqk9+XZd2Kwib942lB6PGhp6FjQ0HB6OGhp7FDQUL4YNPRyIWoo\nHQ0aOjISNZQOvexDKua2lW4P5vqmP5p6eW1XV9d/TXRflmiJOqp89V4EpL+49tprP/ybmV00\n5f7lB0dnXz7fxF88bSiNWiqMRQ2lUUvFoJ3RYhq2FDWURi2NFaKG0kL1J5uQl3aVsl+OTvkZ\nqbn4GcmJn5GMOv3NhuYCkhOQjFr59vdj5fe5+244OeVR9Q6Qmg1ITh0PKX2q59Kreotpuj13\ndMqjyTtAajIgOXU+JK/sMwPJCEhOQAoJSE5AMgJSzBCQnCEg6YAUE5CcgAQkEZCcgAQkEZCc\ngAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCc\ngAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCc\ngAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgAQkEZCcgBTRc4tun9P9WfTwoq+1+gi1\nfWrRD1t9hNqu/u1Wn6C20UUfavURavuHRXdMPphbSM923TKn+7Poi11/2+oj1HZT1w9afYTa\nfveCVp+gttGua1p9hNqe6fqzyQdAan1AMgJSmwUkJyAZnUFIP1zz5Tndn0XfWPOtVh+hti+t\nebHVR6jtc+tafYLa8ms2tfoItR1Ys2PywdxCIlogAYkoICARBTRXkL67/n252yr39vZctuL+\n4hz9bRqoeqIduXJPt/o8pXZ99IolH6r8Z612eZImj9Q+z9KeVUsvu+YvR9M2epaqR5p8luYK\n0jP3Pr6y8sd23+JNB3Z3b5mjv00DVU+0Y9lAqaFWn6fUR3r3Pnd3bmcbPUmTR2qfZ+kbX312\n344lt7fTs1Q90uSzNIcv7Xoqf2zXX1e66V0yPHd/H7/xE+1Y3upzTOvGte31JKXjR2qzZ+mO\nD7Tds1Q+0uSzNOeQlt9TuunP9c/d38dvAtIly5eu7mv1Waqt+nR7PUnp+JHa6lkqDFxzZ5s9\nS+NHmnyW5hpSMbetdHsw1xb/SsYhPfPIvmc35ra3+t4aP4YAAAMmSURBVDAT7brke+31JI0f\nqZ2epdHFF+c25tvqWZo40pRnaQFCqrThyhaeY0p7up9osydp/EjjtcezVDywf+ey+9rqWZo4\n0niVZ2kBvrSrtD031sKDVNvZ/c3yL+30JE0cqVKbPEulvnrx8bZ6ltLxI1WqPEsL8M2GShva\n4mfpB5aMv7/cRk/SqSNVao9nqdyO3OF2epbKlY9UqfIszRWkkYGBD64f+MH4e5aPtcN7ltUT\n3b67/+nbcg+1+jyl7rpk58DAwI/a6EmaPFL7PEuf/3r/Pzz0Oze107NUPdLkszRXkAYq/6Vq\nceneUz2XXtXbBv8VrXqiu1Z2L121p9XHKbescqTy/6q5XZ6kySO1z7N033WX/84fbS1/H2qb\nZ6l6pMlnif+JEFFAQCIKCEhEAQGJKCAgEQUEJKKAgEQUEJCIAgISUUBAIgoISEQBAYkoICAR\nBQSkzmpr8vAd//anfvnBdP/ic1+/9HDlygM3nn/OL36u8tv/+PvnvvbCv+v+qdYeciEGpM5q\na/Kf3vax9W85e9ubln9uWbKscuW8i/f+vzXJ/yrdP/oLZ1971x+9/leAdMYDUme1NTn/aJp+\nJznrz0sPFp/9k/KVt5b/78F/7+z9abouuat09y8TIJ3xgNRZbU02lH954+sKpdtbk2+Wr9xU\nvrI7+Uya/vq/zJfuFt8MpDMekDqrrcnW8i9v/9Xy7ZZkR/lKb/n+88kH0/S176580W8C6YwH\npM5qa/Jw+Ze3v7N8uyX5SvnK5vL9fcm1JUi/UfkiIJ35gNRZZUG6vnz/wSkv7d4CpDMekDqr\nLEjnHkzT0d8463tp+tHkntLlXt5sOPMBqbPKgtT1b9bf9u5kdenCkbe+6g/v/uPX/8qrW3rG\nBRmQOqssSNs+/bZzfuGWysdUvbD0Z15zQd973tDKIy7MgNTpTdCa2lvf1YqDLOyA1OlNg1T5\nfwz218maVh1m4QakTm8apEVX33n3Na8676XWHWehBqRObxqkT7/zZ/7ZeVf/uHWnWbABiSgg\nIBEFBCSigIBEFBCQiAICElFAQCIKCEhEAQGJKCAgEQX0/wGzfpX+X7ybXAAAAABJRU5ErkJg\ngg==",
+      "text/plain": [
+       "plot without title"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data",
+     "source": "R display func"
+    }
+   ],
+   "source": [
+    "library(\"ggplot2\")\n",
+    "ggplot(mtcars, aes(mpg)) + stat_ecdf()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "R",
+   "language": "R",
+   "name": "ir"
+  },
+  "language_info": {
+   "codemirror_mode": "r",
+   "file_extension": ".r",
+   "mimetype": "text/x-r-source",
+   "name": "R",
+   "pygments_lexer": "r",
+   "version": "3.5.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

tests/notebooks/mirror/ipynb_to_Rmd/R notebook with invalid cell keys.Rmd

@@ -0,0 +1,14 @@
+---
+jupyter:
+  kernelspec:
+    display_name: R
+    language: R
+    name: ir
+---
+
+This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+```{r}
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()
+```

tests/notebooks/mirror/ipynb_to_md/R notebook with invalid cell keys.md

@@ -0,0 +1,14 @@
+---
+jupyter:
+  kernelspec:
+    display_name: R
+    language: R
+    name: ir
+---
+
+This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+```R
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()
+```

tests/notebooks/mirror/ipynb_to_pandoc/julia_benchmark_plotly_barchart.md

@@ -5,7 +5,7 @@ jupyter:
     language: python
     name: python3
   nbformat: 4
-  nbformat_minor: 2
+  nbformat_minor: 1
 ---
 
 ::: {.cell .code}

tests/notebooks/mirror/ipynb_to_percent/R notebook with invalid cell keys.R

@@ -0,0 +1,14 @@
+# ---
+# jupyter:
+#   kernelspec:
+#     display_name: R
+#     language: R
+#     name: ir
+# ---
+
+# %% [markdown]
+# This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+# %%
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()

tests/notebooks/mirror/ipynb_to_percent/R notebook with invalid cell keys.low.r

@@ -0,0 +1,14 @@
+# ---
+# jupyter:
+#   kernelspec:
+#     display_name: R
+#     language: R
+#     name: ir
+# ---
+
+# %% [markdown]
+# This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+# %%
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()

tests/notebooks/mirror/ipynb_to_script/R notebook with invalid cell keys.R

@@ -0,0 +1,12 @@
+# ---
+# jupyter:
+#   kernelspec:
+#     display_name: R
+#     language: R
+#     name: ir
+# ---
+
+# This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()

tests/notebooks/mirror/ipynb_to_script/R notebook with invalid cell keys.low.r

@@ -0,0 +1,12 @@
+# ---
+# jupyter:
+#   kernelspec:
+#     display_name: R
+#     language: R
+#     name: ir
+# ---
+
+# This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()

tests/notebooks/mirror/ipynb_to_spin/R notebook with invalid cell keys.R

@@ -0,0 +1,12 @@
+# ---
+# jupyter:
+#   kernelspec:
+#     display_name: R
+#     language: R
+#     name: ir
+# ---
+
+# This notebook was created with IRKernel 0.8.12, and is not completely valid, as the code cell below contains an unexpected 'source' entry. This did cause https://github.com/mwouts/jupytext/issues/234. Note that the problem is solved when one upgrades to IRKernel 1.0.0.
+
+library("ggplot2")
+ggplot(mtcars, aes(mpg)) + stat_ecdf()