added auto-enable to pip dev install

Author: telamonian

README.md

@@ -40,7 +40,7 @@ jupyter labextension list
 
   - Be sure to be in a Git repository in the filebrowser tab
 
-  - Check the server log. If you see a warning with a 404 code similar to:  
+  - Check the server log. If you see a warning with a 404 code similar to:
     `[W 00:27:41.800 LabApp] 404 GET /git/server_root?1576081660665`
 
     Explicitly enable the server extension by running:
@@ -106,7 +106,6 @@ cd jupyterlab-git
 
 # Install the server extension in development mode and enable it
 pip install -e .[test]
-jupyter serverextension enable --py jupyterlab_git
 
 # Build the labextension and dev-mode link it to jlab
 jlpm build

setup.py

@@ -12,6 +12,7 @@
 )
 
 import setuptools
+from setuptools.command.develop import develop
 
 # The name of the project
 name='jupyterlab_git'
@@ -38,9 +39,36 @@ def runPackLabextension():
             pass
 pack_labext = command_for_func(runPackLabextension)
 
+class DevelopAndEnable(develop):
+    def run(self):
+        develop.run(self)
+
+        list_cmd = [
+            'jupyter',
+            'serverextension',
+            'list'
+        ]
+        enable_cmd = [
+            'jupyter',
+            'serverextension',
+            'enable',
+            '--py',
+            'jupyterlab_git'
+        ]
+
+        # test if `jupyter` cmd is available
+        try:
+            run(list_cmd)
+        except:
+            print('`jupyter` cmd not installed, skipping serverextension activation...')
+            return
+
+        print('Enabling serverextension...')
+        run(enable_cmd)
+
 cmdclass = create_cmdclass('pack_labext', data_files_spec=data_files_spec)
 cmdclass['pack_labext'] = pack_labext
-cmdclass.pop('develop')
+cmdclass['develop'] = DevelopAndEnable
 
 with open("README.md", "r") as fh:
     long_description = fh.read()