Allow partial restores (library/settings)

Closes #3136

core/build.gradle.kts

@@ -33,6 +33,7 @@ dependencies {
 
     implementation(libs.unifile)
 
+    implementation(kotlinx.reflect)
     api(kotlinx.coroutines.core)
     api(kotlinx.serialization.json)
     api(kotlinx.serialization.json.okio)
@@ -46,4 +47,6 @@ dependencies {
 
     // JavaScript engine
     implementation(libs.bundles.js.engine)
+
+    testImplementation(libs.bundles.test)
 }

core/src/main/java/tachiyomi/core/util/lang/BooleanArrayExtensions.kt

@@ -0,0 +1,20 @@
+package tachiyomi.core.util.lang
+
+import kotlin.reflect.KProperty1
+import kotlin.reflect.full.declaredMemberProperties
+import kotlin.reflect.full.primaryConstructor
+
+fun <T : Any> T.asBooleanArray(): BooleanArray {
+    val constructorParams = this::class.primaryConstructor!!.parameters.map { it.name }
+    val properties = this::class.declaredMemberProperties
+        .filterIsInstance<KProperty1<T, Boolean>>()
+    return constructorParams
+        .map { param -> properties.find { it.name == param }!!.get(this) }
+        .toBooleanArray()
+}
+
+inline fun <reified T : Any> BooleanArray.asDataClass(): T {
+    val properties = T::class.declaredMemberProperties.filterIsInstance<KProperty1<T, Boolean>>()
+    require(properties.size == this.size) { "Boolean array size does not match data class property count" }
+    return T::class.primaryConstructor!!.call(*this.toTypedArray())
+}

core/src/test/kotlin/tachiyomi/core/util/lang/BooleanArrayExtensionsTest.kt

@@ -0,0 +1,48 @@
+package tachiyomi.core.util.lang
+
+import org.junit.jupiter.api.Assertions.assertArrayEquals
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import org.junit.jupiter.api.parallel.Execution
+import org.junit.jupiter.api.parallel.ExecutionMode
+
+@Execution(ExecutionMode.CONCURRENT)
+class BooleanArrayExtensionsTest {
+
+    @Test
+    fun `converts to boolean array`() {
+        assertArrayEquals(booleanArrayOf(true, false), TestClass(foo = true, bar = false).asBooleanArray())
+        assertArrayEquals(booleanArrayOf(false, true), TestClass(foo = false, bar = true).asBooleanArray())
+    }
+
+    @Test
+    fun `throws error for invalid data classes`() {
+        assertThrows<ClassCastException> {
+            InvalidTestClass(foo = true, bar = "").asBooleanArray()
+        }
+    }
+
+    @Test
+    fun `converts from boolean array`() {
+        assertEquals(booleanArrayOf(true, false).asDataClass<TestClass>(), TestClass(foo = true, bar = false))
+        assertEquals(booleanArrayOf(false, true).asDataClass<TestClass>(), TestClass(foo = false, bar = true))
+    }
+
+    @Test
+    fun `throws error for invalid boolean array`() {
+        assertThrows<IllegalArgumentException> {
+            booleanArrayOf(true).asDataClass<TestClass>()
+        }
+    }
+
+    data class TestClass(
+        val foo: Boolean,
+        val bar: Boolean,
+    )
+
+    data class InvalidTestClass(
+        val foo: Boolean,
+        val bar: String,
+    )
+}