Show download exceptions properly in CLI

src/main/kotlin/link/infra/packwiz/installer/DownloadTask.kt

@@ -152,6 +152,9 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, de
 			}
 		}
 
+		// TODO: if already exists and has correct hash, ignore?
+		// TODO: add .disabled support?
+
 		try {
 			val hash: Hash
 			val fileHashFormat: String
@@ -177,8 +180,12 @@ internal class DownloadTask private constructor(val metadata: IndexFile.File, de
 
 			if (fileSource.hashIsEqual(hash)) {
 				// isDirectory follows symlinks, but createDirectories doesn't
-				if (!Files.isDirectory(destPath.parent)) {
+				try {
 					Files.createDirectories(destPath.parent)
+				} catch (e: FileAlreadyExistsException) {
+					if (!Files.isDirectory(destPath.parent)) {
+						throw e
+					}
 				}
 				Files.copy(data.inputStream(), destPath, StandardCopyOption.REPLACE_EXISTING)
 				data.clear()

src/main/kotlin/link/infra/packwiz/installer/ui/CLIHandler.kt

@@ -3,6 +3,7 @@ package link.infra.packwiz.installer.ui
 import link.infra.packwiz.installer.ui.IUserInterface.ExceptionListResult
 import java.util.concurrent.CompletableFuture
 import java.util.concurrent.Future
+import kotlin.system.exitProcess
 
 class CLIHandler : IUserInterface {
 	override fun handleException(e: Exception) {
@@ -40,8 +41,11 @@ class CLIHandler : IUserInterface {
 	}
 
 	override fun showExceptions(exceptions: List<ExceptionDetails>, numTotal: Int, allowsIgnore: Boolean): Future<ExceptionListResult> {
-		val future = CompletableFuture<ExceptionListResult>()
-		future.complete(ExceptionListResult.CANCEL)
-		return future
+		println("Failed to download modpack, the following errors were encountered:")
+		for (ex in exceptions) {
+			println(ex.name + ": ")
+			ex.exception.printStackTrace()
+		}
+		exitProcess(1)
 	}
 }