feat: switch glide to govendor. (#186)

* feat: switch glide to govendor.

* fix: testing

vendor/github.com/asdine/storm/internal/boltdb.go

@@ -0,0 +1,63 @@
+package internal
+
+import "github.com/boltdb/bolt"
+
+// Cursor that can be reversed
+type Cursor struct {
+	C       *bolt.Cursor
+	Reverse bool
+}
+
+// First element
+func (c *Cursor) First() ([]byte, []byte) {
+	if c.Reverse {
+		return c.C.Last()
+	}
+
+	return c.C.First()
+}
+
+// Next element
+func (c *Cursor) Next() ([]byte, []byte) {
+	if c.Reverse {
+		return c.C.Prev()
+	}
+
+	return c.C.Next()
+}
+
+// RangeCursor that can be reversed
+type RangeCursor struct {
+	C         *bolt.Cursor
+	Reverse   bool
+	Min       []byte
+	Max       []byte
+	CompareFn func([]byte, []byte) int
+}
+
+// First element
+func (c *RangeCursor) First() ([]byte, []byte) {
+	if c.Reverse {
+		return c.C.Seek(c.Max)
+	}
+
+	return c.C.Seek(c.Min)
+}
+
+// Next element
+func (c *RangeCursor) Next() ([]byte, []byte) {
+	if c.Reverse {
+		return c.C.Prev()
+	}
+
+	return c.C.Next()
+}
+
+// Continue tells if the loop needs to continue
+func (c *RangeCursor) Continue(val []byte) bool {
+	if c.Reverse {
+		return val != nil && c.CompareFn(val, c.Min) >= 0
+	}
+
+	return val != nil && c.CompareFn(val, c.Max) <= 0
+}