add 'ago' or 'from now' to duration string

not great code, should probably refactor this at some point

renderer/renderer.go

@@ -70,45 +70,53 @@ func displayInteractionCount(c int64) string {
 	return ""
 }
 
-func DurToStr(dur time.Duration) string {
+func DurToStr(dur time.Duration, isAgo bool) string {
+	ret := ""
+
 	s := dur.Seconds()
-	if s < 60 {
-		return strconv.Itoa(int(s)) + "s"
-	}
 	m := dur.Minutes()
-	if m < 60*2 {
-		return strconv.Itoa(int(m)) + "m"
-	}
 	h := dur.Hours()
-	if h < 24*2 {
-		return strconv.Itoa(int(h)) + "h"
-	}
 	d := h / 24
-	if d < 30*2 {
-		return strconv.Itoa(int(d)) + "d"
-	}
 	mo := d / 30
-	if mo < 12*2 {
-		return strconv.Itoa(int(mo)) + "mo"
-	}
 	y := mo / 12
-	return strconv.Itoa(int(y)) + "y"
+
+	if s < 60 {
+		ret = strconv.Itoa(int(s)) + "s"
+	} else if m < 60*2 {
+		ret = strconv.Itoa(int(m)) + "m"
+	} else if h < 24*2 {
+		ret = strconv.Itoa(int(h)) + "h"
+	} else if d < 30*2 {
+		ret = strconv.Itoa(int(d)) + "d"
+	} else if mo < 12*2 {
+		ret = strconv.Itoa(int(mo)) + "mo"
+	} else {
+		ret = strconv.Itoa(int(y)) + "y"
+	}
+
+	if isAgo {
+		ret += " ago"
+	} else {
+		ret += " from now"
+	}
+
+	return ret
 }
 
 func timeSince(t time.Time) string {
 	d := time.Since(t)
 	if d < 0 {
-		d = 0
+		return timeUntil(t)
 	}
-	return DurToStr(d)
+	return DurToStr(d, true)
 }
 
 func timeUntil(t time.Time) string {
 	d := time.Until(t)
 	if d < 0 {
-		d = 0
+		return timeSince(t)
 	}
-	return DurToStr(d)
+	return DurToStr(d, false)
 }
 
 func formatTimeRFC3339(t time.Time) string {