command auto expansion

Command are now callable with a part of it.
e.g. a, al, ali,alia, call alias

cccli/cli.py

@@ -122,15 +122,18 @@ class Cli(object):
             # execute command
             Command(argv, self).call()
         except BadArgument, e:
-            if str(e) != "":
+            if str(e):
                 printer.error("Bad argument: %s."%str(e))
             else:
                 printer.error("Bad argument.")
             usage = Command.usage(argv[0])
             if usage != "":
                 printer.out("usage: %s."%usage)
-        except BadCommand:
-            printer.error("No command: %s."%argv[0])
+        except BadCommand, e:
+            if str(e):
+                printer.error("command: %s."%str(e))
+            else:
+                printer.error("No command: %s."%argv[0])
         except sjrpc.core.exceptions.RpcError, e:
             if cccli.debug: raise
             printer.error("sjRPC: %s"%str(e))

cccli/command.py

@@ -10,8 +10,23 @@ from cccli.clierror import *
 class Command(object):
 
     def __init__(self, argv, cli):
+        # check argv
         if len(argv) < 1:
             raise BadCommand()
+        # check valid command chars
+        if not re.match("^[a-zA-Z0-9]+", argv[0]):
+            raise BadCommmand("Invalid command name")
+        cmdlist = [ x[4:] for x in dir(self) if x.startswith("cmd_") ]
+        matchlist = [ x for x in cmdlist if re.match("%s.+"%argv[0], x) ]
+        if argv[0] in cmdlist:
+            pass
+        elif len(matchlist) == 1:
+            argv[0] = matchlist[0]
+        elif len(matchlist) > 1:
+            raise BadCommand("Too many command: %s"%", ".join(matchlist))
+        else:
+            raise BadCommand()
+        self._cmd = getattr(self, "cmd_%s"%argv[0])
         self._argv = argv
         self.cli = cli