Optimized code runner and implemented basic IDE feature in app.ed

app/ed.py

@@ -5,6 +5,7 @@
 
 from deck.input import input
 from deck.pager import print_paged
+from deck.runtime import runcode
 
 class Ed:
   def __init__(self, filename=None):
@@ -191,6 +192,11 @@ class Ed:
             self.filename = params
           print(self.filename if self.filename else "No current filename")
 
+        elif cmd_char == 'x': # execute current buffer range as Python code
+          code = '\n'.join(self.buffer[start-1:end])
+          print(f'Running lines {start} to {end} as Python code...')
+          runcode(code)
+
         else:
           print("Unknown command")