markov: reduce code duplication, add command to nuke guild data

This also fixes bugs related to inconsistent handling of per-member
and whole-guild generation.

1 files changed, 12 insertions, 0 deletions

diff --git a/markov/errors.py b/markov/errors.py
index 048aa5b..1af7de8 100644
--- a/markov/errors.py
+++ b/markov/errors.py
@@ -1,2 +1,14 @@
 class MarkovGenerationError(Exception):
     pass
+
+
+class NoTotalCompletionCountError(MarkovGenerationError):
+    pass
+
+
+class NoNextTokenError(MarkovGenerationError):
+    pass
+
+
+class InvalidCompletionCountError(MarkovGenerationError):
+    pass