refactor: specialize exceptionsnedbat/exceptions

CoverageException is fine as a base class, but not good to use for
raising (and catching sometimes).  Introduce specialized exceptions that
allow third-party tools to integrate better.

1 files changed, 19 insertions, 0 deletions

diff --git a/coverage/exceptions.py b/coverage/exceptions.py
index de2257a1..7352e9fc 100644
--- a/coverage/exceptions.py
+++ b/coverage/exceptions.py
@@ -14,6 +14,20 @@ class CoverageException(_BaseCoverageException):
     pass
 
 
+class ConfigError(_BaseCoverageException):
+    """A problem with a config file, or a value in one."""
+    pass
+
+
+class DataError(CoverageException):
+    """An error in using a data file."""
+    pass
+
+class NoDataError(CoverageException):
+    """We didn't have data to work with."""
+    pass
+
+
 class NoSource(CoverageException):
     """We couldn't find the source for a module."""
     pass
@@ -29,6 +43,11 @@ class NotPython(CoverageException):
     pass
 
 
+class PluginError(CoverageException):
+    """A plugin misbehaved."""
+    pass
+
+
 class _ExceptionDuringRun(CoverageException):
     """An exception happened while running customer code.