From e2b6ec92921a2d43f77015f0e75c362a03430e76 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Mon, 6 Feb 2017 19:24:36 -0500
Subject: Move some go stuff into a shared 'util'.

---
 util/date.go | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 util/date.go

(limited to 'util')

diff --git a/util/date.go b/util/date.go
new file mode 100644
index 0000000..3b5c457
--- /dev/null
+++ b/util/date.go
@@ -0,0 +1,51 @@
+package util
+
+import (
+	"html/template"
+	"time"
+)
+
+func Date2HTML(t time.Time) template.HTML {
+	return template.HTML(t.Local().Format("<time datetime=\"2006-01-02 15:04:05\" title=\"2006-01-02 15:04:05\">2006-01-02 <span class=time>15:04:05</span></time>"))
+}
+
+func DateTime2HTML(t time.Time) template.HTML {
+	return template.HTML(t.Local().Format("<time datetime=\"2006-01-02 15:04:05\">2006-01-02 15:04:05</time>"))
+}
+
+func DateTime2ColorHTML(t time.Time) template.HTML {
+	return template.HTML(t.Local().Format("<time class=daily datetime=\"2006-01-02 15:04:05\">2006-01-02 15:04:05</time>"))
+}
+
+type TimeRange struct {
+	A, B time.Time
+}
+
+func (tr TimeRange) ToPct(point time.Time) float64 {
+	dur_ab := tr.B.Sub(tr.A)
+	dur_ap := point.Sub(tr.A)
+	return float64(dur_ap) / float64(dur_ab)
+}
+
+type ByteRange struct {
+	A, B byte
+}
+
+func (br ByteRange) FromPct(pct float64) byte {
+	ab := int16(br.B) - int16(br.A)
+	ap := int16(pct * float64(ab))
+	return byte(int16(br.A) + ap)
+}
+
+func PctCap(pct float64) float64 {
+	if pct < 0 {
+		pct = 0
+	} else if pct > 1 {
+		pct = 1
+	}
+	return pct
+}
+
+func MapRange(tr TimeRange, br ByteRange, t time.Time) byte {
+	return br.FromPct(PctCap(tr.ToPct(t)))
+}
-- 
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