From 294d8572068ba96d54492685ae8bdb450de762cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Tronel?=
 <frederic.tronel@centralesupelec.fr>
Date: Sat, 29 Aug 2026 15:30:47 +0200
Subject: [PATCH] Put all exceptions in their dedicated module.

---
 src/tscut/exceptions.py      | 23 +++++++++++++++++++++++
 src/tscut/tools/discovery.py |  4 ++--
 2 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 src/tscut/exceptions.py

diff --git a/src/tscut/exceptions.py b/src/tscut/exceptions.py
new file mode 100644
index 0000000..0aa19a0
--- /dev/null
+++ b/src/tscut/exceptions.py
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Copyright (C) 2026 Frédéric Tronel
+
+
+from typing import IO
+
+from typeguard import typechecked
+
+class TSCutError(Exception):
+    """Base exception for tscut."""
+
+
+class MissingToolError(TSCutError):
+    """Raised when a required external tool is unavailable."""
+
+
+class ExternalToolError(TSCutError):
+    """Raised when an external tool fails."""
+
+
+class InvalidMediaError(TSCutError):
+    """Raised when input media cannot be processed."""
diff --git a/src/tscut/tools/discovery.py b/src/tscut/tools/discovery.py
index b56a721..671f0ee 100644
--- a/src/tscut/tools/discovery.py
+++ b/src/tscut/tools/discovery.py
@@ -8,10 +8,10 @@ from shutil import which
 
 from typeguard import typechecked
 
+from tscut.exceptions import MissingToolError
+
 logger = logging.getLogger(__name__)
 
-class MissingToolError(Exception):
-    pass
 
 @typechecked
 def check_required_tools() -> tuple[bool,dict[str,str]]: