Add data structure

data.go

@@ -0,0 +1,26 @@
+package main
+
+// Should be enough for wide-screen terminals
+const HistoryLimit = 1024
+
+// Data holds actual data values, being a buffer for
+// UI widges and responsible for flushing/updating/deleting
+// old values.
+type Data struct {
+	cpu *CircularBuffer
+}
+
+// NewData inits new data object.
+func NewData() *Data {
+	return &Data{
+		cpu: NewCircularBuffer(HistoryLimit),
+	}
+}
+
+func (d *Data) AddCPUValue(value float64) {
+	d.cpu.Add(value)
+}
+
+func (d *Data) CPU(n int) []float64 {
+	return d.cpu.Data()
+}