1 files changed, 15 insertions, 0 deletions
diff --git a/bin/utils/cmd_line.py b/bin/utils/cmd_line.py
new file mode 100644
index 0000000..6bfeafe
--- /dev/null
+++ b/bin/utils/cmd_line.py
@@ -0,0 +1,15 @@
+# Copyright 2016 (c) Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "Simple image filters" project.
+# For details, see https://github.com/egor-tensin/filters.
+# Distributed under the MIT License.
+
+import argparse
+
+def parse_non_negative_integer(s):
+    try:
+        x = int(s)
+    except ValueError:
+        raise argparse.ArgumentTypeError('must be a non-negative integer: ' + s)
+    if x < 0:
+        raise argparse.ArgumentTypeError('must be a non-negative integer: ' + s)
+    return x