At program counter sign

Currently at its most trivial

python3/vimspector/debug_adapter_connection.py

@@ -119,7 +119,6 @@ class DebugAdapterConnection( object ):
         _logger.error( 'Request failed: {0}'.format( message[ 'message' ] ) )
         vim.command( "echom 'Request failed: {0}'".format(
           message[ 'message' ] ) )
-
     elif message[ 'type' ] == 'event':
       method = 'OnEvent_' + message[ 'event' ]
       if method in dir( self._handler ) and getattr( self._handler, method ):

python3/vimspector/debug_session.py

@@ -20,6 +20,8 @@ from vimspector import debug_adapter_connection, stack_trace, utils, variables
 
 _logger = logging.getLogger( __name__ )
 
+SIGN_ID_OFFSET = 10000000
+
 
 class DebugSession( object ):
   def __init__( self, channel_send_func ):
@@ -34,12 +36,16 @@ class DebugSession( object ):
     self._threadsBuffer = None
     self._outputBuffer = None
 
-    # TODO: How to hold/model this data
     self._currentThread = None
     self._currentFrame = None
 
     self._SetUpUI()
 
+    self._next_sign_id = SIGN_ID_OFFSET
+    self._signs = {
+      'vimspectorPC': None,
+    }
+
   def _SetUpUI( self ):
     # Code window
     vim.command( 'tabnew' )
@@ -52,6 +58,8 @@ class DebugSession( object ):
     vim.command( 'nnoremenu WinBar.Finish :call vimspector#StepOut()<CR>' )
     vim.command( 'nnoremenu WinBar.Pause :call vimspector#Pause()<CR>' )
 
+    vim.command( 'sign define vimspectorPC text=>> texthl=Search' )
+
     # Threads
     vim.command( '50vspl' )
     vim.command( 'enew' )
@@ -83,6 +91,11 @@ class DebugSession( object ):
   def SetCurrentFrame( self, frame ):
     self._currentFrame = frame
     vim.current.window = self._codeWindow
+
+    if self._signs[ 'vimspectorPC' ]:
+      vim.command( 'sign unplace {0}'.format( self._signs[ 'vimspectorPC' ] ) )
+      self._signs[ 'vimspectorPC' ] = None
+
     buffer_number = vim.eval( 'bufnr( "{0}", 1 )'.format(
       frame[ 'source' ][ 'path' ]  ) )
 
@@ -93,6 +106,16 @@ class DebugSession( object ):
         raise
 
     self._codeWindow.cursor = ( frame[ 'line' ], frame[ 'column' ] )
+
+    self._signs[ 'vimspectorPC' ] = self._next_sign_id
+    self._next_sign_id += 1
+
+    vim.command( 'sign place {0} line={1} name=vimspectorPC file={2}'.format(
+      self._signs[ 'vimspectorPC' ],
+      frame[ 'line' ],
+      frame[ 'source' ][ 'path' ] ) )
+
+
     self._variablesView.LoadScopes( frame )
 
 
@@ -103,6 +126,10 @@ class DebugSession( object ):
     self._Initialise()
 
   def Stop( self ):
+    if self._signs[ 'vimspectorPC' ]:
+      vim.command( 'sign unplace {0}'.format( self._signs[ 'vimspectorPC' ] ) )
+      self._signs[ 'vimspectorPC' ] = None
+
     self._connection.DoRequest( None, {
       'command': 'disconnect',
       'arguments': {