X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=err.go;fp=err.go;h=9240a3e2da44134e57f01fcf418ee3526e0a96fe;hb=fc065e1408aa2e452699d1bae1a56af9fcc69bec;hp=0000000000000000000000000000000000000000;hpb=d9d136ebf49a2906cd0b1def833ade96784626f6;p=goredo.git

diff --git a/err.go b/err.go
new file mode 100644
index 0000000..9240a3e
--- /dev/null
+++ b/err.go
@@ -0,0 +1,56 @@
+/*
+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}
+}