From b51bf84d05e317d8a8179d72a788190b350a95a1 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Thu, 31 Aug 2017 21:29:53 +0200
Subject: [PATCH] Add helper for booleans

---
 .../net/pterodactylus/sone/utils/Booleans.kt       |  6 ++++++
 .../net/pterodactylus/sone/utils/BooleansTest.kt   | 23 ++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 src/main/kotlin/net/pterodactylus/sone/utils/Booleans.kt
 create mode 100644 src/test/kotlin/net/pterodactylus/sone/utils/BooleansTest.kt

diff --git a/src/main/kotlin/net/pterodactylus/sone/utils/Booleans.kt b/src/main/kotlin/net/pterodactylus/sone/utils/Booleans.kt
new file mode 100644
index 0000000..3202b82
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/utils/Booleans.kt
@@ -0,0 +1,6 @@
+package net.pterodactylus.sone.utils
+
+/**
+ * Returns the value of [block] if `this` is true, returns `null` otherwise.
+ */
+fun <R> Boolean.ifTrue(block: () -> R): R? = if (this) block() else null
diff --git a/src/test/kotlin/net/pterodactylus/sone/utils/BooleansTest.kt b/src/test/kotlin/net/pterodactylus/sone/utils/BooleansTest.kt
new file mode 100644
index 0000000..5e5ce51
--- /dev/null
+++ b/src/test/kotlin/net/pterodactylus/sone/utils/BooleansTest.kt
@@ -0,0 +1,23 @@
+package net.pterodactylus.sone.utils
+
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers.equalTo
+import org.hamcrest.Matchers.nullValue
+import org.junit.Test
+
+/**
+ * Unit test for [Booleans].
+ */
+class BooleansTest {
+
+	@Test
+	fun `ifTrue is executed if boolean is true`() {
+		assertThat(true.ifTrue { true }, equalTo(true))
+	}
+
+	@Test
+	fun `ifTrue is not executed if boolean is false`() {
+		assertThat(false.ifTrue { true }, nullValue())
+	}
+
+}
-- 
2.7.4