Add Reline autocompletion prompt behind a feature flag

lib/msf/core/feature_manager.rb

@@ -29,6 +29,7 @@ class FeatureManager
     LDAP_SESSION_TYPE = 'ldap_session_type'
     SHOW_SUCCESSFUL_LOGINS = 'show_successful_logins'
     DISPLAY_MODULE_ACTION = 'display_module_action'
+    SHOW_AUTOCOMPLETION_PROMPT = 'show_autocompletion_prompt'
 
     DEFAULTS = [
       {
@@ -132,6 +133,13 @@ class FeatureManager
         requires_restart: false,
         default_value: true,
         developer_notes: 'Added as a feature so users can turn it off if they wish to reduce clutter in their terminal'
+      }.freeze,
+      {
+        name: SHOW_AUTOCOMPLETION_PROMPT,
+        description: 'When enabled, an autocompletion prompt will be shown when typing in commands',
+        requires_restart: true,
+        default_value: false,
+        developer_notes: 'To be enabled once the Readline to Reline upgrade has been confirmed to not cause issues'
       }.freeze
     ].freeze
 

lib/rex/ui/text/shell.rb

@@ -130,6 +130,10 @@ def run(&block)
       # Pry is a development dependency, if not available suppressing history_load can be safely ignored.
     end
 
+    if framework.features.enabled?(Msf::FeatureManager::SHOW_AUTOCOMPLETION_PROMPT)
+      Reline.autocompletion = true
+    end
+
     with_history_manager_context do
       begin
         while true