cli: remove readline import

Bug-Url: #1161

pyroute2/cli/console.py

@@ -6,17 +6,9 @@
 from pyroute2.cli.session import Session
 from pyroute2.ndb.main import NDB
 
-try:
-    import readline
-
-    HAS_READLINE = True
-except ImportError:
-    HAS_READLINE = False
-
 
 class Console(code.InteractiveConsole):
     def __init__(self, stdout=None, log=None, sources=None):
-        global HAS_READLINE
         self.db = NDB(log=log, sources=sources)
         self.db.config.update(
             {'show_format': 'json', 'recordset_pipe': 'true'}
@@ -28,10 +20,6 @@ def __init__(self, stdout=None, log=None, sources=None):
         self.prompt = ''
         self.set_prompt()
         code.InteractiveConsole.__init__(self)
-        if HAS_READLINE:
-            readline.parse_and_bind('tab: complete')
-            readline.set_completer(self.completer)
-            readline.set_completion_display_matches_hook(self.display)
 
     def close(self):
         self.db.close()
@@ -92,6 +80,11 @@ def interact(self, readfunc=None):
                 self.showtraceback()
                 continue
 
+    def set_completer(self, readline):
+        readline.parse_and_bind('tab: complete')
+        readline.set_completer(self.completer)
+        readline.set_completion_display_matches_hook(self.display)
+
     def completer(self, text, state):
         if state == 0:
             d = [x for x in dir(self.session.ptr) if x.startswith(text)]