From 144ff5375297551b70e9948e622e0bcafb95eead Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <ste.pigozzi@gmail.com>
Date: Fri, 15 Mar 2019 14:57:13 +0100
Subject: [PATCH] Add possible command exceptions

---
 royalnet/utils/__init__.py |  4 ++--
 royalnet/utils/command.py  | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/royalnet/utils/__init__.py b/royalnet/utils/__init__.py
index f752aa98..3e8886db 100644
--- a/royalnet/utils/__init__.py
+++ b/royalnet/utils/__init__.py
@@ -1,6 +1,6 @@
 from .asyncify import asyncify
 from .call import Call
-from .command import Command
+from .command import Command, InvalidInputError, UnsupportedError
 from .safeformat import safeformat
 
-__all__ = ["asyncify", "Call", "Command", "safeformat"]
+__all__ = ["asyncify", "Call", "Command", "safeformat", "InvalidInputError", "UnsupportedError"]
diff --git a/royalnet/utils/command.py b/royalnet/utils/command.py
index 3bb44155..8b02eeba 100644
--- a/royalnet/utils/command.py
+++ b/royalnet/utils/command.py
@@ -3,6 +3,16 @@ if typing.TYPE_CHECKING:
     from .call import Call
 
 
+class UnsupportedError(Exception):
+    """The command is not supported for the specified source."""
+    pass
+
+
+class InvalidInputError(Exception):
+    """The command has received invalid input and cannot complete."""
+    pass
+
+
 class Command:
     """A generic command, called from any source."""