Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

shoutrrr/cmd/exit_codes.go

@@ -0,0 +1,53 @@
+package cmd
+
+const (
+	// ExSuccess is the exit code that signals that everything went as expected.
+	ExSuccess = 0
+	// ExUsage is the exit code that signals that the application was not started with the correct arguments.
+	ExUsage = 64
+	// ExUnavailable is the exit code that signals that the application failed to perform the intended task.
+	ExUnavailable = 69
+	// ExConfig is the exit code that signals that the task failed due to a configuration error.
+	ExConfig = 78
+)
+
+// Success is the empty Result that is used whenever the command ran successfully.
+//
+//nolint:errname
+var Success = Result{}
+
+// Result contains the final exit message and code for a CLI session.
+//
+//nolint:errname
+type Result struct {
+	ExitCode int
+	Message  string
+}
+
+func (e Result) Error() string {
+	return e.Message
+}
+
+// InvalidUsage returns a Result with the exit code ExUsage.
+func InvalidUsage(message string) Result {
+	return Result{
+		ExUsage,
+		message,
+	}
+}
+
+// TaskUnavailable returns a Result with the exit code ExUnavailable.
+func TaskUnavailable(message string) Result {
+	return Result{
+		ExUnavailable,
+		message,
+	}
+}
+
+// ConfigurationError returns a Result with the exit code ExConfig.
+func ConfigurationError(message string) Result {
+	return Result{
+		ExConfig,
+		message,
+	}
+}