fix #28

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

@@ -84,6 +84,11 @@ public class AbstractPlugin implements Plugin<Project> {
 		configureIDEs();
 		configureCompile();
 
+		if(extension.refmapName == null || extension.refmapName.isEmpty()){
+			project.getLogger().warn("Could not find refmap definition, will be using default name: " + project.getName() + "-refmap.json");
+			extension.refmapName = project.getName() + "-refmap.json";
+		}
+
 		Map<Project, Set<Task>> taskMap = project.getAllTasks(true);
 		for (Map.Entry<Project, Set<Task>> entry : taskMap.entrySet()) {
 			Project project = entry.getKey();
@@ -97,10 +102,6 @@ public class AbstractPlugin implements Plugin<Project> {
 						try {
 							javaCompileTask.getOptions().getCompilerArgs().add("-AinMapFileNamedIntermediary=" + extension.getMappingsProvider().MAPPINGS_TINY.getCanonicalPath());
 							javaCompileTask.getOptions().getCompilerArgs().add("-AoutMapFileNamedIntermediary=" + extension.getMappingsProvider().MAPPINGS_MIXIN_EXPORT.getCanonicalPath());
-							if(extension.refmapName == null || extension.refmapName.isEmpty()){
-								project.getLogger().error("Could not find refmap definition, will be using default name: " + project.getName() + "-refmap.json");
-								extension.refmapName = project.getName() + "-refmap.json";
-							}
 							javaCompileTask.getOptions().getCompilerArgs().add("-AoutRefMapFile=" + new File(javaCompileTask.getDestinationDir(), extension.refmapName).getCanonicalPath());
 							javaCompileTask.getOptions().getCompilerArgs().add("-AdefaultObfuscationEnv=named:intermediary");
 						} catch (IOException e) {
@@ -233,6 +234,9 @@ public class AbstractPlugin implements Plugin<Project> {
 				remapJarTask.doLast(task -> project1.getArtifacts().add("archives", remapJarTask.jar));
 				remapJarTask.dependsOn(project1.getTasks().getByName("jar"));
 				project1.getTasks().getByName("build").dependsOn(remapJarTask);
+			} else {
+				AbstractArchiveTask jarTask = (AbstractArchiveTask) project1.getTasks().getByName("jar");
+				extension.addUnmappedMod(jarTask.getArchivePath());
 			}
 		});
 	}

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

@@ -31,12 +31,17 @@ import net.fabricmc.loom.util.LoomDependencyManager;
 import org.gradle.api.Project;
 
 import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 public class LoomGradleExtension {
 	public String runDir = "run";
 	public String refmapName;
 	public boolean remapMod = true;
 
+	private List<File> unmappedModsBuilt = new ArrayList<>();
+
 	//Not to be set in the build.gradle
 	private Project project;
 	private LoomDependencyManager dependencyManager;
@@ -45,6 +50,14 @@ public class LoomGradleExtension {
 		this.project = project;
 	}
 
+	public void addUnmappedMod(File file) {
+		unmappedModsBuilt.add(file);
+	}
+
+	public List<File> getUnmappedMods() {
+		return Collections.unmodifiableList(unmappedModsBuilt);
+	}
+
 	public File getUserCache() {
 		File userCache = new File(project.getGradle().getGradleUserHomeDir(), "caches" + File.separator + "fabric-loom");
 		if (!userCache.exists()) {

src/main/java/net/fabricmc/loom/task/RunClientTask.java

@@ -46,8 +46,7 @@ public class RunClientTask extends JavaExec {
 		for (File file : getProject().getConfigurations().getByName("compile").getFiles()) {
 			libs.add(file.getAbsolutePath());
 		}
-		//Used to add the fabric jar that has been built
-		for (File file : new File(getProject().getBuildDir(), "libs").listFiles()) {
+		for (File file : extension.getUnmappedMods()) {
 			if (file.isFile()) {
 				libs.add(file.getAbsolutePath());
 			}

src/main/java/net/fabricmc/loom/task/RunServerTask.java

@@ -42,8 +42,7 @@ public class RunServerTask extends JavaExec {
 		for (File file : getProject().getConfigurations().getByName("compile").getFiles()) {
 			libs.add(file.getAbsolutePath());
 		}
-		//Used to add the fabric jar that has been built
-		for (File file : new File(getProject().getBuildDir(), "libs").listFiles()) {
+		for (File file : extension.getUnmappedMods()) {
 			if (file.isFile()) {
 				libs.add(file.getAbsolutePath());
 			}

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

@@ -66,6 +66,11 @@ public class ModRemapper {
 		File modJarOutput = new File(s.substring(0, s.length() - 4) + ".remapped.jar");
 		Path modJarOutputPath = modJarOutput.toPath();
 
+		File modJarUnmappedCopy = new File(s.substring(0, s.length() - 4) + "-dev.jar");
+		if (modJarUnmappedCopy.exists()) {
+			modJarUnmappedCopy.delete();
+		}
+
 		File mixinMapFile = mappingsProvider.MAPPINGS_MIXIN_EXPORT;
 		Path mixinMapPath = mixinMapFile.toPath();
 
@@ -99,7 +104,8 @@ public class ModRemapper {
 		}
 
 		if (modJar.exists()) {
-			modJar.delete();
+			modJar.renameTo(modJarUnmappedCopy);
+			extension.addUnmappedMod(modJarUnmappedCopy);
 		}
 
 		modJarOutput.renameTo(modJar);