added

vendor/github.com/glycerine/greenpack/msgp/clue.go

@@ -0,0 +1,37 @@
+package msgp
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func Clue2Field(name string, clue string, zid int64) string {
+	if zid >= 0 {
+		return fmt.Sprintf("%s_zid%02d_%s", name, zid, clue)
+	}
+	// handle the missing zid, and don't write -1 as the zid.
+	return fmt.Sprintf("%s__%s", name, clue)
+}
+
+func Field2Clue(fieldname string) (name string, clue string, zid int64, err error) {
+	parts := strings.Split(fieldname, "_")
+	n := len(parts)
+	if n < 3 {
+		err = fmt.Errorf("too few underscore (expect at least two) in fieldname '%s'", fieldname)
+		return
+	}
+	clue = parts[n-1]
+	if strings.HasPrefix(parts[n-2], "zid") {
+		tmp, err2 := strconv.Atoi(parts[n-2][3:])
+		if err2 == nil {
+			zid = int64(tmp)
+		} else {
+			err = fmt.Errorf("problem parsing out _zid field in fieldname '%s': '%v'", fieldname, err2)
+			return
+		}
+	}
+	used := len(parts[n-1]) + len(parts[n-2]) + 2
+	name = fieldname[:len(fieldname)-used]
+	return
+}