1 files changed, 43 insertions, 0 deletions
diff --git a/src/tools/ak/res/respipe/errors.go b/src/tools/ak/res/respipe/errors.go
new file mode 100644
index 0000000..60cbb02
--- /dev/null
+++ b/src/tools/ak/res/respipe/errors.go
@@ -0,0 +1,43 @@
+// Copyright 2022 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package respipe
+
+import (
+	"fmt"
+	"strings"
+
+	"context"
+)
+
+const (
+	ctxErrPrefix = "err-prefix"
+)
+
+// Errorf returns a formatted error with any context sensitive information prefixed to the error
+func Errorf(ctx context.Context, fmts string, a ...interface{}) error {
+	if s, ok := ctx.Value(ctxErrPrefix).(string); ok {
+		return fmt.Errorf(strings.Join([]string{s, fmts}, ""), a...)
+	}
+	return fmt.Errorf(fmts, a...)
+}
+
+// PrefixErr returns a context which adds a prefix to error messages.
+func PrefixErr(ctx context.Context, add string) context.Context {
+	if s, ok := ctx.Value(ctxErrPrefix).(string); ok {
+		return context.WithValue(ctx, ctxErrPrefix, strings.Join([]string{s, add}, ""))
+	}
+	return context.WithValue(ctx, ctxErrPrefix, add)
+
+}