Add support for mode field, with CurseForge metadata lookup

Now always asks the user before proceeding past the point where optional mods could be selected and configured
When updating files, the hash is checked so an update isn't redownloaded if it already exists
Added DevMain file for running in a dev environment

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

@@ -23,6 +23,8 @@ interface IUserInterface {
 
 	fun showCancellationDialog(): CancellationResult = CancellationResult.QUIT
 
+	fun awaitOptionalButton(showCancel: Boolean)
+
 	enum class ExceptionListResult {
 		CONTINUE, CANCEL, IGNORE
 	}

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

@@ -59,4 +59,8 @@ class CLIHandler : IUserInterface {
 		}
 		return ExceptionListResult.CANCEL
 	}
+
+	override fun awaitOptionalButton(showCancel: Boolean) {
+		// Do nothing
+	}
 }

src/main/kotlin/link/infra/packwiz/installer/ui/gui/GUIHandler.kt

@@ -8,6 +8,7 @@ import link.infra.packwiz.installer.ui.data.InstallProgress
 import link.infra.packwiz.installer.util.Log
 import java.awt.EventQueue
 import java.util.concurrent.CompletableFuture
+import java.util.concurrent.CountDownLatch
 import javax.swing.JDialog
 import javax.swing.JOptionPane
 import javax.swing.UIManager
@@ -18,8 +19,21 @@ class GUIHandler : IUserInterface {
 
 	@Volatile
 	override var optionsButtonPressed = false
+		set(value) {
+			optionalSelectedLatch.countDown()
+			field = value
+		}
 	@Volatile
 	override var cancelButtonPressed = false
+		set(value) {
+			optionalSelectedLatch.countDown()
+			field = value
+		}
+	var okButtonPressed = false
+		set(value) {
+			optionalSelectedLatch.countDown()
+			field = value
+		}
 	@Volatile
 	override var firstInstall = false
 
@@ -42,8 +56,12 @@ class GUIHandler : IUserInterface {
 		}
 	}
 
+	private val visibleCountdownLatch = CountDownLatch(1)
+	private val optionalSelectedLatch = CountDownLatch(1)
+
 	override fun show() = EventQueue.invokeLater {
 		frmPackwizlauncher.isVisible = true
+		visibleCountdownLatch.countDown()
 	}
 
 	override fun dispose() = EventQueue.invokeAndWait {
@@ -147,4 +165,15 @@ class GUIHandler : IUserInterface {
 		}
 		return future.get()
 	}
+
+	override fun awaitOptionalButton(showCancel: Boolean) {
+		EventQueue.invokeAndWait {
+			frmPackwizlauncher.showOk(!showCancel)
+		}
+		visibleCountdownLatch.await()
+		optionalSelectedLatch.await()
+		EventQueue.invokeLater {
+			frmPackwizlauncher.hideOk()
+		}
+	}
 }

src/main/kotlin/link/infra/packwiz/installer/ui/gui/InstallWindow.kt

@@ -12,6 +12,9 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
 	private var lblProgresslabel: JLabel
 	private var progressBar: JProgressBar
 	private var btnOptions: JButton
+	private val btnCancel: JButton
+	private val btnOk: JButton
+	private val buttonsPanel: JPanel
 
 	init {
 		setBounds(100, 100, 493, 95)
@@ -35,7 +38,7 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
 		}, BorderLayout.CENTER)
 
 		// Buttons
-		add(JPanel().apply {
+		buttonsPanel = JPanel().apply {
 			border = EmptyBorder(0, 5, 0, 5)
 			layout = GridBagLayout()
 
@@ -49,20 +52,28 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
 				}
 			}
 			add(btnOptions, GridBagConstraints().apply {
-				gridx = 0
+				gridx = 1
 				gridy = 0
 			})
 
-			add(JButton("Cancel").apply {
+			btnCancel = JButton("Cancel").apply {
 				addActionListener {
 					isEnabled = false
 					handler.cancelButtonPressed = true
 				}
-			}, GridBagConstraints().apply {
-				gridx = 0
+			}
+			add(btnCancel, GridBagConstraints().apply {
+				gridx = 1
 				gridy = 1
 			})
-		}, BorderLayout.EAST)
+		}
+
+		btnOk = JButton("Continue").apply {
+			addActionListener {
+				handler.okButtonPressed = true
+			}
+		}
+		add(buttonsPanel, BorderLayout.EAST)
 	}
 
 	fun displayProgress(progress: InstallProgress) {
@@ -83,4 +94,31 @@ class InstallWindow(private val handler: GUIHandler) : JFrame() {
  			isEnabled = false
 		}
 	}
+
+	fun showOk(hideCancel: Boolean) {
+		if (hideCancel) {
+			buttonsPanel.add(btnOk, GridBagConstraints().apply {
+				gridx = 1
+				gridy = 1
+			})
+			buttonsPanel.remove(btnCancel)
+		} else {
+			buttonsPanel.add(btnOk, GridBagConstraints().apply {
+				gridx = 0
+				gridy = 1
+			})
+		}
+		buttonsPanel.revalidate()
+	}
+
+	fun hideOk() {
+		buttonsPanel.remove(btnOk)
+		if (!buttonsPanel.components.contains(btnCancel)) {
+			buttonsPanel.add(btnCancel, GridBagConstraints().apply {
+				gridx = 1
+				gridy = 1
+			})
+		}
+		buttonsPanel.revalidate()
+	}
 }