preparing for v0.5

src/error/errors.go

@@ -0,0 +1,30 @@
+package error
+
+var (
+	ErrAlreadyStarted = new("already started")
+	ErrNotStarted     = new("not started")
+	ErrInvalid        = new("invalid")
+	ErrUnsupported    = new("unsupported")
+	ErrNotExists      = new("does not exist")
+	ErrDuplicated     = new("duplicated")
+)
+
+func Failure(what string) NestedError {
+	return errorf("%s failed", what)
+}
+
+func Invalid(subject, what any) NestedError {
+	return errorf("%w %s: %q", ErrInvalid, subject, what)
+}
+
+func Unsupported(subject, what any) NestedError {
+	return errorf("%w %s: %q", ErrUnsupported, subject, what)
+}
+
+func NotExists(subject, what any) NestedError {
+	return errorf("%s %w: %q", subject, ErrNotExists, what)
+}
+
+func Duplicated(subject, what any) NestedError {
+	return errorf("%w %s: %q", ErrDuplicated, subject, what)
+}