Adding upstream version 2.1.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

times.go

@@ -0,0 +1,46 @@
+package chart
+
+import (
+	"sort"
+	"time"
+)
+
+// Assert types implement interfaces.
+var (
+	_ Sequence       = (*Times)(nil)
+	_ sort.Interface = (*Times)(nil)
+)
+
+// Times are an array of times.
+// It wraps the array with methods that implement `seq.Provider`.
+type Times []time.Time
+
+// Array returns the times to an array.
+func (t Times) Array() []time.Time {
+	return []time.Time(t)
+}
+
+// Len returns the length of the array.
+func (t Times) Len() int {
+	return len(t)
+}
+
+// GetValue returns a value at an index as a time.
+func (t Times) GetValue(index int) float64 {
+	return ToFloat64(t[index])
+}
+
+// Swap implements sort.Interface.
+func (t Times) Swap(i, j int) {
+	t[i], t[j] = t[j], t[i]
+}
+
+// Less implements sort.Interface.
+func (t Times) Less(i, j int) bool {
+	return t[i].Before(t[j])
+}
+
+// ToFloat64 returns a float64 representation of a time.
+func ToFloat64(t time.Time) float64 {
+	return float64(t.UnixNano())
+}