diff --git a/install_gadget.py b/install_gadget.py
index af2794e..5cfc395 100755
--- a/install_gadget.py
+++ b/install_gadget.py
@@ -163,19 +163,8 @@ for custom_file_name in functools.reduce( operator.add,
 
 
 failed = []
-if args.update_gadget_config:
-  with open( install.GetGadgetConfigFile( vimspector_base ), 'r' ) as f:
-    all_adapters = json.load( f ).get( 'adapters', {} )
-else:
-  all_adapters = {}
-
-# Include "built-in" adapter for multi-session mode
-all_adapters.update( {
-  'multi-session': {
-    'port': '${port}',
-    'host': '${host}'
-  },
-} )
+all_adapters = installer.ReadAdapters(
+  read_existing = args.update_gadget_config )
 
 for name, gadget in gadgets.GADGETS.items():
   if not gadget.get( 'enabled', True ):
@@ -197,17 +186,12 @@ for name, gadget in gadgets.GADGETS.items():
 for name, gadget in CUSTOM_GADGETS.items():
   installer.InstallGagdet( name, gadget, failed, all_adapters )
 
-adapter_config = json.dumps ( { 'adapters': all_adapters },
-                              indent=2,
-                              sort_keys=True )
-
 if args.no_gadget_config:
   print( "" )
   print( "Would write the following gadgets: " )
-  print( adapter_config )
+  installer.WriteAdapters( all_adapters, to_file = sys.stdout )
 else:
-  with open( install.GetGadgetConfigFile( vimspector_base ), 'w' ) as f:
-    f.write( adapter_config )
+  installer.WriteAdapters( all_adapters )
 
 if failed:
   raise RuntimeError( 'Failed to install gadgets: {}'.format(
diff --git a/python3/vimspector/installer.py b/python3/vimspector/installer.py
index 9e42fee..8bf78b0 100644
--- a/python3/vimspector/installer.py
+++ b/python3/vimspector/installer.py
@@ -211,6 +211,38 @@ def InstallGagdet( name, gadget, failed, all_adapters ):
     print( "FAILED installing {}: {}".format( name, e ) )
 
 
+def ReadAdapters( read_existing = True ):
+  if read_existing:
+    with open( install.GetGadgetConfigFile( options.vimspector_base ),
+               'r' ) as f:
+      all_adapters = json.load( f ).get( 'adapters', {} )
+  else:
+    all_adapters = {}
+
+  # Include "built-in" adapter for multi-session mode
+  all_adapters.update( {
+    'multi-session': {
+      'port': '${port}',
+      'host': '${host}'
+    },
+  } )
+
+  return all_adapters
+
+
+def WriteAdapters( all_adapters, to_file=None ):
+  adapter_config = json.dumps ( { 'adapters': all_adapters },
+                                indent=2,
+                                sort_keys=True )
+
+  if to_file:
+    to_file.write( adapter_config )
+  else:
+    with open( install.GetGadgetConfigFile( options.vimspector_base ),
+               'w' ) as f:
+      f.write( adapter_config )
+
+
 @contextlib.contextmanager
 def CurrentWorkingDir( d ):
   cur_d = os.getcwd()