+/*
+goredo -- djb's redo implementation on pure Go
+Copyright (C) 2020-2023 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+ "errors"
+ "fmt"
+ "runtime"
+)
+
+type ErrLineErr struct {
+ err error
+ file string
+ line int
+ function string
+}
+
+func (err ErrLineErr) Error() string {
+ return fmt.Sprintf("%s:%d: %s: %s", err.file, err.line, err.function, err.err)
+}
+
+func (err ErrLineErr) Unwrap() error {
+ return err.err
+}
+
+func ErrLine(err error) error {
+ if err == nil {
+ return err
+ }
+ pc := make([]uintptr, 10)
+ n := runtime.Callers(2, pc)
+ pc = pc[:n]
+ frames := runtime.CallersFrames(pc)
+ frame, _ := frames.Next()
+ var errLine ErrLineErr
+ if errors.As(err, &errLine) {
+ errLine.function = frame.Function + "," + errLine.function
+ return errLine
+ }
+ return ErrLineErr{err, frame.File, frame.Line, frame.Function}
+}