feat: some experiments

template/error.go

@@ -0,0 +1,36 @@
+package template
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Error struct {
+	err        error
+	start, end int
+}
+
+func (e Error) Error() string {
+	content := e.err.Error()
+
+	if strings.Contains(content, " @pos ") {
+		if e.start == e.end {
+			return strings.ReplaceAll(content, " @pos ", " ")
+		}
+		return strings.ReplaceAll(content, " @pos ", fmt.Sprintf(" position=%d:%d ", e.start, e.end))
+	}
+
+	return content
+}
+
+func NewErrorf(msg string, args ...any) Error {
+	return Error{
+		err: fmt.Errorf(msg, args...),
+	}
+}
+
+func (e Error) WithPosition(start, end int) Error {
+	e.start = start
+	e.end = end
+	return e
+}