Fix local adapter specs

Somehow we lost the ability to define adapters in the local
.vimspector.json, I think when GetConfigurations was added.

Put that feature back.

autoload/vimspector.vim

@@ -296,8 +296,8 @@ function! vimspector#GetConfigurations() abort
     return
   endif
   let configurations = py3eval(
-              \ 'list( _vimspector_session.GetConfigurations()[ 1 ].keys() )'
+        \ 'list( _vimspector_session.GetConfigurations( {} )[ 1 ].keys() )'
-              \ . ' if _vimspector_session else []' )
+        \ . ' if _vimspector_session else []' )
   return configurations
 endfunction
 

python3/vimspector/debug_session.py

@@ -79,7 +79,7 @@ class DebugSession( object ):
     self._server_capabilities = {}
     self.ClearTemporaryBreakpoints()
 
-  def GetConfigurations( self ):
+  def GetConfigurations( self, adapters ):
     current_file = utils.GetBufferFilepath( vim.current.buffer )
     filetypes = utils.GetBufferFiletypes( vim.current.buffer )
     configurations = {}
@@ -93,7 +93,8 @@ class DebugSession( object ):
 
       with open( launch_config_file, 'r' ) as f:
         database = json.loads( minify( f.read() ) )
-        configurations.update( database.get( 'configurations' or {} ) )
+        configurations.update( database.get( 'configurations' ) or {} )
+        adapters.update( database.get( 'adapters' ) or {} )
 
     return launch_config_file, configurations
 
@@ -109,8 +110,8 @@ class DebugSession( object ):
     self._adapter = None
 
     current_file = utils.GetBufferFilepath( vim.current.buffer )
-    launch_config_file, configurations = self.GetConfigurations()
     adapters = {}
+    launch_config_file, configurations = self.GetConfigurations( adapters )
 
     if not configurations:
       utils.UserMessage( 'Unable to find any debug configurations. '

support/test/python/simple_python/.vimspector.json

@@ -1,5 +1,17 @@
 {
+  "$schema": "https://puremourning.github.io/vimspector/schema/vimspector.schema.json",
+  "adapters": {
+    "test_custom": {
+      "command": "This is a test"
+    }
+  },
   "configurations": {
+    "Use custom gadget": {
+      "adapter": "test_custom",
+      "configuration": {
+        "request": "launch"
+      }
+    },
     // This is a comment.
     "run legacy vscode-python": {
       "adapter": "vscode-python", /* coment goes here too */