Multiple terminals and conditional initialisation

IPython/html/notebookapp.py

@@ -190,7 +190,6 b' class NotebookWebApplication(web.Application):'
         handlers.extend(load_handlers('notebook.handlers'))
         handlers.extend(load_handlers('nbconvert.handlers'))
         handlers.extend(load_handlers('kernelspecs.handlers'))
-        handlers.extend(load_handlers('terminal.handlers'))
         handlers.extend(load_handlers('services.kernels.handlers'))
         handlers.extend(load_handlers('services.contents.handlers'))
         handlers.extend(load_handlers('services.clusters.handlers'))
@@ -762,6 +761,15 b' class NotebookApp(BaseIPythonApplication):'
         proto = 'https' if self.certfile else 'http'
         return "%s://%s:%i%s" % (proto, ip, self.port, self.base_url)
 
+    def init_terminals(self):
+        try:
+            from .terminal import initialize
+            initialize(self.web_app)
+            self.web_app.terminals_available = True
+        except ImportError as e:
+            self.log.info("Terminals not available (error was %s)", e)
+            self.web_app.terminals_available = False
+
     def init_signal(self):
         if not sys.platform.startswith('win'):
             signal.signal(signal.SIGINT, self._handle_sigint)
@@ -841,6 +849,7 b' class NotebookApp(BaseIPythonApplication):'
         self.init_configurables()
         self.init_components()
         self.init_webapp()
+        self.init_terminals()
         self.init_signal()
 
     def cleanup_kernels(self):

IPython/html/static/terminal/js/main.js

@@ -22,8 +22,9 b' require(['
     $("#dummy-screen").hide();
 
     var base_url = utils.get_body_data('baseUrl');
+    var ws_path = utils.get_body_data('wsPath');
     var ws_url = location.protocol.replace('http', 'ws') + "//" + location.host
-                                    + base_url + "terminal/websocket";
+                                    + base_url + ws_path;
     
     var header = $("#header")[0]
     function calculate_size() {

IPython/html/templates/terminal.html

@@ -10,6 +10,7 b''
 {% block params %}
 
 data-base-url="{{base_url}}"
+data-ws-path="{{ws_path}}"
 
 {% endblock %}
 

IPython/html/terminal/__init__.py

@@ -0,0 +1,14 b''
+import os
+from terminado import NamedTermManager
+from .handlers import TerminalHandler, NewTerminalHandler, TermSocket
+
+def initialize(webapp):
+    shell = os.environ.get('SHELL', 'sh')
+    webapp.terminal_manager = NamedTermManager(shell_command=[shell])
+    handlers = [
+        (r"/terminals/new", NewTerminalHandler),
+        (r"/terminals/(\w+)", TerminalHandler),
+        (r"/terminals/websocket/(\w+)", TermSocket,
+             {'term_manager': webapp.terminal_manager}),
+    ]
+    webapp.add_handlers(".*$", handlers)
  No newline at end of file

IPython/html/terminal/handlers.py

@@ -8,19 +8,17 b' import terminado'
 from ..base.handlers import IPythonHandler
 
 class TerminalHandler(IPythonHandler):
-    """Render the tree view, listing notebooks, clusters, etc."""
+    """Render the terminal interface."""
     @web.authenticated
-    def get(self, path='', name=None):
-        self.write(self.render_template('terminal.html'))
-
-
-#-----------------------------------------------------------------------------
-# URL to handler mappings
-#-----------------------------------------------------------------------------
+    def get(self, term_name):
+        self.write(self.render_template('terminal.html',
+                   ws_path="terminals/websocket/%s" % term_name))
 
+class NewTerminalHandler(IPythonHandler):
+    """Redirect to a new terminal."""
+    @web.authenticated
+    def get(self):
+        name, _ = self.application.terminal_manager.new_named_terminal()
+        self.redirect("/terminals/%s" % name, permanent=False)
 
-default_handlers = [
-    (r"/terminal", TerminalHandler),
-    (r"/terminal/websocket", terminado.TermSocket,
-         {'term_manager': terminado.SingleTermManager(shell_command=['bash'])}),
-    ]
+TermSocket = terminado.TermSocket