1 files changed, 35 insertions, 0 deletions
diff --git a/node_modules/speedometer/index.js b/node_modules/speedometer/index.js
new file mode 100644
index 0000000..5570fe0
--- /dev/null
+++ b/node_modules/speedometer/index.js
@@ -0,0 +1,35 @@
+var tick = 1
+var maxTick = 65535
+var resolution = 4
+var inc = function() {
+  tick = (tick + 1) & maxTick
+}
+
+var timer = setInterval(inc, (1000 / resolution) | 0)
+if (timer.unref) timer.unref()
+
+module.exports = function(seconds) {
+  var size = resolution * (seconds || 5)
+  var buffer = [0]
+  var pointer = 1
+  var last = (tick-1) & maxTick
+
+  return function(delta) {
+    var dist = (tick - last) & maxTick
+    if (dist > size) dist = size
+    last = tick
+
+    while (dist--) {
+      if (pointer === size) pointer = 0
+      buffer[pointer] = buffer[pointer === 0 ? size-1 : pointer-1]
+      pointer++
+    }
+
+    if (delta) buffer[pointer-1] += delta
+
+    var top = buffer[pointer-1]
+    var btm = buffer.length < size ? 0 : buffer[pointer === size ? 0 : pointer]
+
+    return buffer.length < resolution ? top : (top - btm) * resolution / buffer.length
+  }
+}
+\ No newline at end of file