refactor count parsing of key events

Author: itchyny

key/key.go

@@ -65,16 +65,16 @@ func (km *Manager) Press(k Key) event.Event {
 		keys := km.keys[i:]
 		var count int64
 		if km.count {
-			numStr := ""
+			var countStr string
 			for j, k := range keys {
-				if len(k) == 1 && ('1' <= k[0] && k[0] <= '9' || k[0] == '0' && j > 0) {
-					numStr += string(k)
+				if "1" <= k && k <= "9" || k == "0" && j > 0 {
+					countStr += string(k)
 				} else {
 					break
 				}
 			}
-			keys = keys[len(numStr):]
-			count, _ = strconv.ParseInt(numStr, 10, 64)
+			keys = keys[len(countStr):]
+			count, _ = strconv.ParseInt(countStr, 10, 64)
 		}
 		for _, ke := range km.events {
 			switch ke.cmp(keys) {