Allow setting the value via the api

autoload/vimspector.vim

@@ -209,11 +209,15 @@ function! vimspector#ExpandVariable() abort
   py3 _vimspector_session.ExpandVariable()
 endfunction
 
-function! vimspector#SetVariableValue() abort
+function! vimspector#SetVariableValue( ... ) abort
   if !s:Enabled()
     return
   endif
+  if a:0 == 0
     py3 _vimspector_session.SetVariableValue()
+  else
+    py3 _vimspector_session.SetVariableValue( new_value = vim.eval( 'a:1' ) )
+  endif
 endfunction
 
 function! vimspector#DeleteWatch() abort

plugin/vimspector.vim

@@ -129,6 +129,7 @@ augroup VimspectorUserAutoCmds
   autocmd user VimspectorDebugEnded     silent
 augroup END
 
+" FIXME: Only register this _while_ debugging is active
 augroup Vimspector
   autocmd!
   autocmd BufNew * call vimspector#OnBufferCreated( expand( '<afile>' ) )

python3/vimspector/debug_session.py

@@ -526,8 +526,8 @@ class DebugSession( object ):
     self._variablesView.ExpandVariable( buf, line_num )
 
   @IfConnected()
-  def SetVariableValue( self, buf = None, line_num = None ):
+  def SetVariableValue( self, new_value = None, buf = None, line_num = None ):
-    self._variablesView.SetVariableValue( buf, line_num )
+    self._variablesView.SetVariableValue( new_value, buf, line_num )
 
   @IfConnected()
   def AddWatch( self, expression ):

python3/vimspector/variables.py

@@ -518,7 +518,7 @@ class VariablesView( object ):
       },
     } )
 
-  def SetVariableValue( self, buf = None, line_num = None ):
+  def SetVariableValue( self, new_value = None, buf = None, line_num = None ):
     variable: Variable
     view: View
 
@@ -532,6 +532,7 @@ class VariablesView( object ):
     if not variable.IsContained():
       return
 
+    if new_value is None:
       new_value = utils.AskForInput( 'New Value: ',
                                      variable.variable.get( 'value', '' ),
                                      completion = 'expr' )