explicit jupyter lab build

Install the bundled extension rather than the one from npm

#259 #276

README.md

@@ -83,11 +83,10 @@ In JupyterLab, Jupytext adds a set of commands to the command palette:
 
 ![JupyterLab extension](https://raw.githubusercontent.com/mwouts/jupyterlab-jupytext/master/jupytext_commands.png)
 
-If you don't see these commands, install the extension manually with
+The Jupytext extension for JupyterLab is bundled with Jupytext. Installing Jupytext will trigger a build of JupyterLab the next time you open it. If you prefer, you can trigger the build manually with
 ```
-jupyter labextension install jupyterlab-jupytext
+jupyter lab build
 ```
-(the above requires `npm`, run `conda install nodejs` first if you don't have `npm`).
 
 ## Using Jupytext
 

binder/postBuild

@@ -1,12 +1,18 @@
+# Stop everything if one command fails
+set -e
+
 # Install the bash kernel
 python -m bash_kernel.install
 
 # Trust our notebook
 jupyter trust demo/World\ population.ipynb
 
-# Set up extensions for JupyterLab and Notebook
-jupyter labextension install jupyterlab-jupytext
+# Build jupyter lab to include the Jupytext extension
+jupyter lab build
 
 # Create the notebook for our jupytext demo
 jupytext demo/get_started.md --to ipynb --update-metadata '{"jupytext":null}'
+
+# Remove the markdown representation
+# the demo starts with just the ipynb file
 rm demo/get_started.md

docs/install.md

@@ -49,8 +49,7 @@ In JupyterLab, Jupytext adds a set of commands to the command palette:
 
 ![JupyterLab extension](https://raw.githubusercontent.com/mwouts/jupyterlab-jupytext/master/jupytext_commands.png)
 
-If you don't see these commands, install the extension manually with
+The Jupytext extension for JupyterLab is bundled with Jupytext. Installing Jupytext will trigger a build of JupyterLab the next time you open it. If you prefer, you can trigger the build manually with
 ```
-jupyter labextension install jupyterlab-jupytext
+jupyter lab build
 ```
-(the above requires `npm`, run `conda install nodejs` first if you don't have `npm`).