implement CAManager shell with python cmd shell

ca_manager.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
 
+import cmd
 import hashlib
 import json
 import os
@@ -416,37 +418,47 @@ def main():
     ]
 
     with CAManager(MANAGER_PATH) as ca_manager:
-        print("# LILiK CA Manager")
-
-        exiting = False
-
-        while not exiting:
-            selection = input('Command> ')
-
-            if selection == 'help':
-                print("Available commands:")
-                for entry_id, entry_name in menu_entries:
-                    print("%-13s :    %s" % (entry_id, entry_name))
-            elif selection == 'quit':
-                exiting = True
-            elif selection == 'list-cas':
-                list_cas(ca_manager)
-            elif selection == 'show-ca':
-                pass
-            elif selection == 'gen-ssh-ca':
-                ca_id = input("CA unique id> ")
-                ca_name = input("CA human-readable name> ")
-                ca_manager.create_ssh_ca(ca_id, ca_name)
-            elif selection == 'gen-ssl-ca':
-                ca_id = input("CA unique id> ")
-                ca_name = input("CA human-readable name> ")
-                ca_manager.create_ssl_ca(ca_id, ca_name)
-            elif selection == 'sign-request':
-                sign_request(ca_manager)
-            else:
-                print("Unrecognized command. Type 'help' to show available "
-                        "commands.")
 
+class CAManagerShell(cmd.Cmd):
+    intro= "# LILiK CA Manager"
+    prompt= "(CA Manager)> "
+
+    def __init__(self, path):
+        self.ca_manager= CAManager(path)
+        init_manager([
+            path,
+            REQUESTS_PATH,
+            OUTPUT_PATH,
+            RESULTS_PATH,
+            ])
+
+    def do_ls(self):
+        'List the available certification authorities: LS'
+        list_cas(ca_manager)
+
+    def do_show_ca(self):
+        'Show certification authority information: SHOW_CA example'
+        raise NotImplementedError()
+
+    def do_gen_ssh_ca(self):
+        'Generate a SSH certification authority: GEN_SSH_CA'
+        ca_id = input("CA unique id> ")
+        ca_name = input("CA human-readable name> ")
+        ca_manager.create_ssh_ca(ca_id, ca_name)
+
+    def do_gen_ssl_ca(self):
+        'Generate a SSL certification authority: GEN_SSL_CA'
+        ca_id = input("CA unique id> ")
+        ca_name = input("CA human-readable name> ")
+        ca_manager.create_ssl_ca(ca_id, ca_name)
+
+    def do_sign_request(self):
+        'Sign a certificate from a request'
+        sign_request(ca_manager)
+
+    def do_quit(self):
+        'Quit this shell'
+        return True
 
 def list_cas(ca_manager):
     for ca_id, ca_name, ca_type in ca_manager.get_cas_list():