Use a Swing File Chooser if JUI needs the user to pick a file

src/main/kotlin/ca/gosyer/util/system/File.kt

@@ -10,6 +10,8 @@ import ca.gosyer.BuildConfig
 import net.harawata.appdirs.AppDirs
 import net.harawata.appdirs.AppDirsFactory
 import java.io.File
+import javax.swing.JFileChooser
+import javax.swing.SwingUtilities
 
 val appDirs: AppDirs by lazy {
     AppDirsFactory.getInstance()
@@ -20,3 +22,34 @@ val userDataDir: File by lazy {
         if (!it.exists()) it.mkdirs()
     }
 }
+
+/**
+ * Opens a swing file picker, in the details view by default
+ *
+ * @param builder invokes this builder before launching the file picker, such as adding a action listener
+ * @param onCancel the listener that is called when picking a file is canceled
+ * @param onError the listener that is called when picking a file exited with a error
+ * @param onApprove the listener that is called when picking a file is completed
+ */
+fun filePicker(
+    builder: JFileChooser.() -> Unit = {},
+    onCancel: (JFileChooser) -> Unit = {},
+    onError: (JFileChooser) -> Unit = {},
+    onApprove: (JFileChooser) -> Unit
+) = SwingUtilities.invokeLater {
+    val fileChooser = JFileChooser()
+        .apply {
+            val details = actionMap.get("viewTypeDetails")
+            details?.actionPerformed(null)
+        }
+        .apply(builder)
+
+    val result = fileChooser
+        .showOpenDialog(null)
+
+    when (result) {
+        JFileChooser.APPROVE_OPTION -> onApprove(fileChooser)
+        JFileChooser.CANCEL_OPTION -> onCancel(fileChooser)
+        JFileChooser.ERROR_OPTION -> onError(fileChooser)
+    }
+}