Initial commit

internal/util/absminus.go

@@ -0,0 +1,18 @@
+package util
+
+// AbsMinusd returns the value, with the absolute value subtracted
+// by minus, or 0 if minus is more than abs.
+func AbsMinusd(val, minus float64) float64 {
+	if val > 0 {
+		val -= minus
+		if val < 0 {
+			val = 0
+		}
+	} else {
+		val += minus
+		if val > 0 {
+			val = 0
+		}
+	}
+	return val
+}