Fix printout crafting

Introduced by the previous commit — I'd made one of the checks too lax.
Add some tests for this, so it doesn't happen again, though this code
does get a complete rewrite in 1.21 anyway >_>.

projects/common/src/main/java/dan200/computercraft/shared/media/recipes/PrintoutRecipe.java

@@ -58,7 +58,7 @@ public final class PrintoutRecipe extends CustomRecipe {
             for (var x = 0; x < inventory.getWidth(); x++) {
                 var stack = inventory.getItem(x + y * inventory.getWidth());
                 if (!stack.isEmpty()) {
-                    if (!stack.is(ModRegistry.Items.PRINTED_BOOK.get())) {
+                    if (stack.is(ModRegistry.Items.PRINTED_PAGE.get()) || stack.is(ModRegistry.Items.PRINTED_PAGES.get())) {
                         if (printouts == null) printouts = new ItemStack[9];
                         printouts[numPrintouts] = stack;
                         numPages += PrintoutItem.getPageCount(stack);

projects/common/src/testFixtures/java/dan200/computercraft/test/shared/ItemStackMatcher.java

@@ -27,6 +27,11 @@ public class ItemStackMatcher extends TypeSafeMatcher<ItemStack> {
         description.appendValue(stack).appendValue(stack.getTag());
     }
 
+    @Override
+    protected void describeMismatchSafely(ItemStack item, Description description) {
+        description.appendText("was ").appendValue(stack).appendValue(stack.getTag());
+    }
+
     public static Matcher<ItemStack> isStack(ItemStack stack) {
         return new ItemStackMatcher(stack);
     }

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Printout_Test.kt

@@ -5,9 +5,17 @@
 package dan200.computercraft.gametest
 
 import dan200.computercraft.gametest.api.*
+import dan200.computercraft.shared.ModRegistry
+import dan200.computercraft.shared.media.items.PrintoutItem
+import dan200.computercraft.test.shared.ItemStackMatcher.isStack
+import net.minecraft.gametest.framework.GameTest
 import net.minecraft.gametest.framework.GameTestGenerator
 import net.minecraft.gametest.framework.GameTestHelper
 import net.minecraft.gametest.framework.TestFunction
+import net.minecraft.world.item.ItemStack
+import net.minecraft.world.item.Items
+import org.hamcrest.MatcherAssert.assertThat
+import org.junit.jupiter.api.Assertions.assertEquals
 
 class Printout_Test {
     /**
@@ -56,4 +64,52 @@ class Printout_Test {
 
         thenExecute { helper.level.dayTime = Times.NOON }
     }
+
+    @GameTest(template = "default")
+    fun Craft_pages(helper: GameTestHelper) = helper.immediate {
+        // Assert that crafting with only one page fails
+        helper.assertNotCraftable(ItemStack(ModRegistry.Items.PRINTED_PAGE.get()), ItemStack(Items.STRING))
+
+        // Assert that crafting with no pages fails
+        helper.assertNotCraftable(ItemStack(Items.PAPER), ItemStack(Items.PAPER), ItemStack(Items.STRING))
+
+        // Assert that crafting with a book fails
+        helper.assertNotCraftable(ItemStack(ModRegistry.Items.PRINTED_PAGE.get()), ItemStack(ModRegistry.Items.PRINTED_BOOK.get()), ItemStack(Items.STRING))
+
+        assertThat(
+            helper.craftItem(
+                PrintoutItem.createSingleFromTitleAndText("First", createPagesOf(' '), createPagesOf('b')),
+                PrintoutItem.createMultipleFromTitleAndText("Second", createPagesOf(' '), createPagesOf('b')),
+                ItemStack(Items.STRING),
+            ),
+            isStack(PrintoutItem.createMultipleFromTitleAndText("First", createPagesOf(' ', 2), createPagesOf('b', 2))),
+        )
+    }
+
+    @GameTest(template = "default")
+    fun Craft_book(helper: GameTestHelper) = helper.immediate {
+        // Assert that crafting with no pages fails
+        helper.assertNotCraftable(ItemStack(Items.PAPER), ItemStack(Items.PAPER), ItemStack(Items.STRING), ItemStack(Items.LEATHER))
+
+        // Assert that crafting with only one page works
+        assertEquals(
+            ModRegistry.Items.PRINTED_BOOK.get(),
+            helper.craftItem(ItemStack(ModRegistry.Items.PRINTED_PAGE.get()), ItemStack(Items.STRING), ItemStack(Items.LEATHER)).item,
+        )
+
+        assertThat(
+            helper.craftItem(
+                PrintoutItem.createSingleFromTitleAndText("First", createPagesOf(' '), createPagesOf('b')),
+                PrintoutItem.createMultipleFromTitleAndText("Second", createPagesOf(' '), createPagesOf('b')),
+                ItemStack(Items.STRING),
+                ItemStack(Items.LEATHER),
+            ),
+            isStack(PrintoutItem.createBookFromTitleAndText("First", createPagesOf(' ', 2), createPagesOf('b', 2))),
+        )
+    }
+
+    private fun createPagesOf(c: Char, pages: Int = 1): Array<String> {
+        val line = c.toString().repeat(PrintoutItem.LINE_MAX_LENGTH)
+        return Array(PrintoutItem.LINES_PER_PAGE * pages) { line }
+    }
 }

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Recipe_Test.kt

@@ -6,20 +6,18 @@ package dan200.computercraft.gametest
 
 import com.mojang.authlib.GameProfile
 import dan200.computercraft.gametest.api.Structures
+import dan200.computercraft.gametest.api.craftItem
 import dan200.computercraft.gametest.api.sequence
 import dan200.computercraft.shared.ModRegistry
 import net.minecraft.gametest.framework.GameTest
-import net.minecraft.gametest.framework.GameTestAssertException
 import net.minecraft.gametest.framework.GameTestHelper
 import net.minecraft.nbt.CompoundTag
 import net.minecraft.nbt.NbtUtils
 import net.minecraft.world.entity.player.Player
 import net.minecraft.world.inventory.AbstractContainerMenu
 import net.minecraft.world.inventory.MenuType
-import net.minecraft.world.inventory.TransientCraftingContainer
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.Items
-import net.minecraft.world.item.crafting.RecipeType
 import org.junit.jupiter.api.Assertions.assertEquals
 import java.util.*
 
@@ -32,15 +30,10 @@ class Recipe_Test {
     @GameTest(template = Structures.DEFAULT)
     fun Craft_result_has_nbt(context: GameTestHelper) = context.sequence {
         thenExecute {
-            val container = TransientCraftingContainer(DummyMenu, 3, 3)
+            val result = context.craftItem(
-            container.setItem(0, ItemStack(Items.SKELETON_SKULL))
+                ItemStack(Items.SKELETON_SKULL),
-            container.setItem(1, ItemStack(ModRegistry.Items.COMPUTER_ADVANCED.get()))
+                ItemStack(ModRegistry.Items.COMPUTER_ADVANCED.get()),
-
+            )
-            val recipe = context.level.server.recipeManager
-                .getRecipeFor(RecipeType.CRAFTING, container, context.level)
-                .orElseThrow { GameTestAssertException("No recipe matches") }
-
-            val result = recipe.assemble(container, context.level.registryAccess())
 
             val profile = GameProfile(UUID.fromString("f3c8d69b-0776-4512-8434-d1b2165909eb"), "dan200")
 

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/api/TestExtensions.kt

@@ -5,6 +5,7 @@
 package dan200.computercraft.gametest.api
 
 import dan200.computercraft.api.peripheral.IPeripheral
+import dan200.computercraft.gametest.Recipe_Test.DummyMenu
 import dan200.computercraft.gametest.core.ManagedComputers
 import dan200.computercraft.mixin.gametest.GameTestHelperAccessor
 import dan200.computercraft.mixin.gametest.GameTestInfoAccessor
@@ -22,9 +23,11 @@ import net.minecraft.world.Container
 import net.minecraft.world.InteractionHand
 import net.minecraft.world.entity.Entity
 import net.minecraft.world.entity.EntityType
+import net.minecraft.world.inventory.TransientCraftingContainer
 import net.minecraft.world.item.Item
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.context.UseOnContext
+import net.minecraft.world.item.crafting.RecipeType
 import net.minecraft.world.level.block.Blocks
 import net.minecraft.world.level.block.entity.BarrelBlockEntity
 import net.minecraft.world.level.block.entity.BlockEntity
@@ -343,6 +346,32 @@ fun GameTestHelper.placeItemAt(stack: ItemStack, pos: BlockPos, direction: Direc
     stack.useOn(UseOnContext(player, InteractionHand.MAIN_HAND, hit))
 }
 
+/**
+ * Assert a recipe is not craftable.
+ */
+fun GameTestHelper.assertNotCraftable(vararg items: ItemStack) {
+    val container = TransientCraftingContainer(DummyMenu, 3, 3)
+    for ((i, item) in items.withIndex()) container.setItem(i, item)
+
+    val recipe = level.server.recipeManager.getRecipeFor(RecipeType.CRAFTING, container, level)
+
+    if (recipe.isPresent) fail("Expected no recipe to match $items")
+}
+
+/**
+ * Attempt to craft an item.
+ */
+fun GameTestHelper.craftItem(vararg items: ItemStack): ItemStack {
+    val container = TransientCraftingContainer(DummyMenu, 3, 3)
+    for ((i, item) in items.withIndex()) container.setItem(i, item)
+
+    val recipe = level.server.recipeManager
+        .getRecipeFor(RecipeType.CRAFTING, container, level)
+        .orElseThrow { GameTestAssertException("No recipe matches $items") }
+
+    return recipe.assemble(container, level.registryAccess())
+}
+
 /**
  * Run a function multiple times until it succeeds.
  */