gradle 5.0 support, fix #38

src/main/java/net/fabricmc/loom/AbstractPlugin.java

@@ -38,6 +38,7 @@ import org.gradle.api.Project;
 import org.gradle.api.Task;
 import org.gradle.api.UnknownTaskException;
 import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.dsl.DependencyHandler;
 import org.gradle.api.artifacts.repositories.MavenArtifactRepository;
 import org.gradle.api.plugins.JavaPlugin;
 import org.gradle.api.plugins.JavaPluginConvention;
@@ -235,6 +236,10 @@ public class AbstractPlugin implements Plugin<Project> {
 				SetupIntelijRunConfigs.setup(project1);
 			}
 
+			// add dependencies for mixin annotation processor
+			DependencyHandler handler = project1.getDependencies();
+			handler.add("annotationProcessor", "net.fabricmc:sponge-mixin:" + extension.getMixinVersion());
+			handler.add("annotationProcessor", "net.fabricmc:fabric-loom:" + extension.getLoomVersion());
 
 			// Enables the default mod remapper
 			if (extension.remapMod) {

src/main/java/net/fabricmc/loom/LoomGradleExtension.java

@@ -31,14 +31,14 @@ import net.fabricmc.loom.providers.MinecraftProvider;
 import net.fabricmc.loom.util.LoomDependencyManager;
 import org.cadixdev.lorenz.MappingSet;
 import org.gradle.api.Project;
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.ConfigurationContainer;
 import org.gradle.api.artifacts.Dependency;
 
 import javax.annotation.Nullable;
 import java.io.File;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.Objects;
+import java.util.*;
+import java.util.function.BiPredicate;
 import java.util.function.Supplier;
 
 public class LoomGradleExtension {
@@ -109,18 +109,85 @@ public class LoomGradleExtension {
 	}
 
 	@Nullable
-	public String getMixinVersion() {
-		for (Dependency dependency : project.getConfigurations().getByName("compile").getDependencies()) {
-			if (dependency.getName().equalsIgnoreCase("mixin") && dependency.getGroup().equals("org.spongepowered")) {
-				return dependency.getVersion();
+	private Dependency findDependency(Collection<String> configs, BiPredicate<String, String> groupNameFilter) {
+		for (String s : configs) {
+			for (Dependency dependency : project.getConfigurations().getByName(s).getDependencies()) {
+				if (groupNameFilter.test(dependency.getGroup(), dependency.getName())) {
+					return dependency;
+				}
+			}
 		}
 
-			if (dependency.getName().equals("sponge-mixin") && dependency.getGroup().equals("net.fabricmc")) {
+		return null;
+	}
+
+	@Nullable
+	private Dependency findBuildscriptDependency(BiPredicate<String, String> groupNameFilter) {
+		for (Configuration config : project.getBuildscript().getConfigurations().getAsMap().values()) {
+			for (Dependency dependency : config.getDependencies()) {
+				if (groupNameFilter.test(dependency.getGroup(), dependency.getName())) {
+					return dependency;
+				}
+			}
+		}
+
+		return null;
+	}
+
+	@Nullable
+	public String getLoomVersion() {
+		Dependency dependency = findBuildscriptDependency((group, name) -> {
+			if (name.equalsIgnoreCase("fabric-loom")) {
+				return group.equalsIgnoreCase("net.fabricmc");
+			}
+
+			if (name.equalsIgnoreCase("fabric-loom.gradle.plugin")) {
+				return group.equalsIgnoreCase("fabric-loom");
+			}
+
+			return false;
+		});
+
+		return dependency != null ? dependency.getVersion() : null;
+	}
+
+	@Nullable
+	private Dependency getMixinDependency() {
+		return findDependency(Collections.singletonList("compile"), (group, name) -> {
+			if (name.equalsIgnoreCase("mixin") && group.equalsIgnoreCase("org.spongepowered")) {
+				return true;
+			}
+
+			if (name.equalsIgnoreCase("sponge-mixin") && group.equalsIgnoreCase("net.fabricmc")) {
+				return true;
+			}
+
+			return false;
+		});
+	}
+
+	@Nullable
+	public String getMixinVersion() {
+		Dependency dependency = getMixinDependency();
+		if (dependency != null) {
+			return dependency.getVersion();
+		} else {
+			return null;
+		}
+	}
+
+	@Nullable
+	public String getMixinJsonVersion() {
+		Dependency dependency = getMixinDependency();
+
+		if (dependency != null) {
+			if (dependency.getGroup().equalsIgnoreCase("net.fabricmc")) {
 				if (Objects.requireNonNull(dependency.getVersion()).split("\\.").length >= 4) {
 					return dependency.getVersion().substring(0, dependency.getVersion().lastIndexOf('.')) + "-SNAPSHOT";
 				}
-				return dependency.getVersion();
 			}
+
+			return dependency.getVersion();
 		}
 
 		return null;

src/main/java/net/fabricmc/loom/mixin/MixinServiceGradle.java

@@ -25,7 +25,6 @@
 package net.fabricmc.loom.mixin;
 
 import com.google.common.io.ByteStreams;
-import com.strobel.collections.ImmutableList;
 import org.spongepowered.asm.lib.ClassReader;
 import org.spongepowered.asm.lib.tree.ClassNode;
 import org.spongepowered.asm.mixin.MixinEnvironment;
@@ -146,7 +145,7 @@ public class MixinServiceGradle implements IClassBytecodeProvider, IClassProvide
 
 	@Override
 	public Collection<String> getPlatformAgents() {
-		return ImmutableList.of("org.spongepowered.asm.launch.platform.MixinPlatformAgentDefault");
+		return Collections.singletonList("org.spongepowered.asm.launch.platform.MixinPlatformAgentDefault");
 	}
 
 	public byte[] getClassBytes(String name, String transformedName) throws IOException {

src/main/java/net/fabricmc/loom/util/ModRemapper.java

@@ -32,7 +32,6 @@ import net.fabricmc.tinyremapper.OutputConsumerPath;
 import net.fabricmc.tinyremapper.TinyRemapper;
 import net.fabricmc.tinyremapper.TinyUtils;
 import org.gradle.api.Project;
-import org.gradle.api.artifacts.Dependency;
 
 import java.io.File;
 import java.io.IOException;
@@ -103,7 +102,7 @@ public class ModRemapper {
 		}
 
 		if (extension.refmapName != null && extension.refmapName.length() > 0) {
-			if (MixinRefmapHelper.addRefmapName(extension.refmapName, extension.getMixinVersion(), modJarOutput)) {
+			if (MixinRefmapHelper.addRefmapName(extension.refmapName, extension.getMixinJsonVersion(), modJarOutput)) {
 				project.getLogger().debug("Transformed mixin reference maps in output JAR!");
 			}
 		}

src/main/java/net/fabricmc/loom/util/RunConfig.java

@@ -25,10 +25,10 @@
 package net.fabricmc.loom.util;
 
 import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
-import com.strobel.collections.ImmutableList;
 import net.fabricmc.loom.LoomGradleExtension;
 import net.fabricmc.loom.providers.MinecraftProvider;
 import org.apache.commons.io.IOUtils;