feat: 命令行工具

download/base/timer.go

@@ -0,0 +1,25 @@
+package base
+
+import "time"
+
+// 计时器
+type Timer struct {
+	t    int64
+	used int64
+}
+
+func (t *Timer) Start() {
+	t.t = time.Now().UnixNano()
+}
+
+func (t *Timer) Pause() {
+	t.used += time.Now().UnixNano() - t.t
+}
+
+func (t *Timer) Continue() {
+	t.t = time.Now().UnixNano()
+}
+
+func (t *Timer) Used() int64 {
+	return (time.Now().UnixNano() - t.t) + t.used
+}