Enable "GUI" inputhook only if it's not enabled

Author: tkf

src/ipython_jl/entrypoints.py

@@ -17,7 +17,6 @@ def post_startup_configuration(ip):
     from . import ipyext
     ip.run_cell(dedent("""
     %load_ext {ipyext}
-    %gui julia
     """.format(ipyext=ipyext.__name__)))
 
 

src/ipython_jl/ipyext.py

@@ -59,6 +59,8 @@ def load_ipython_extension(ip):
 
     from IPython.terminal.pt_inputhooks import register
     register("julia", julia_inputhook)
+    if not ip.active_eventloop:
+        ip.enable_gui("julia")
 
     ip.set_hook("complete_command", _julia_completer,
                 re_key=r""".*\bMain\.eval\(["']""")