add percent units

build.gradle

@@ -51,7 +51,7 @@ publishing {
 		release(MavenPublication) {
 			groupId = 'org.team4099'
 			artifactId = 'falconutils'
-			version = '1.1.1'
+			version = '1.1.2'
 
 			from(components["kotlin"])
 		}

src/main/kotlin/org/team4099/lib/units/base/Percent.kt

@@ -0,0 +1,29 @@
+package org.team4099.lib.units.base
+
+import org.team4099.lib.units.Fraction
+import org.team4099.lib.units.Unitless
+import org.team4099.lib.units.Value
+
+typealias Decimal = Value<Unitless>
+
+typealias Rate = Value<Fraction<Unitless, Second>>
+
+const val PERCENTAGE_TO_DOUBLE = 0.01
+
+inline val Double.percent: Decimal
+  get() = Decimal(this * PERCENTAGE_TO_DOUBLE)
+
+inline val Number.percent: Decimal
+  get() = this.toDouble().percent
+
+inline val Decimal.toDecimal: Double
+  get() = value
+
+inline val Decimal.toPercent: Double
+    get() = value / PERCENTAGE_TO_DOUBLE
+
+inline val Rate.inOutputPerSecond: Double
+  get() = value
+
+inline val Rate.inPercentPerSecond: Double
+  get() = value / PERCENTAGE_TO_DOUBLE

src/test/kotlin/team4099/units/PercentTest.kt

@@ -0,0 +1,25 @@
+package team4099.units
+
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+import org.team4099.lib.units.base.inOutputPerSecond
+import org.team4099.lib.units.base.percent
+import org.team4099.lib.units.base.seconds
+import org.team4099.lib.units.base.toDecimal
+import org.team4099.lib.units.perSecond
+
+class PercentTest {
+  private val kEpsilon = 1E-9
+
+  @Test
+  fun testPercentToDecimal() {
+    val percent = 50.0.percent
+    Assertions.assertEquals(percent.toDecimal, 0.5, kEpsilon)
+  }
+
+  @Test
+  fun testRate() {
+    val rate = 50.0.percent / 2.seconds
+    Assertions.assertEquals(rate.inOutputPerSecond, 0.25, kEpsilon)
+  }
+}