desktop: fix creating tmpDir and providing name for file to save (#2789)

* desktop: creating tmpDir

* provide name for saved file

* directories only selection on Mac

* specified filename for file savers

---------

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/DesktopApp.kt

@@ -122,6 +122,7 @@ class SimplexWindowState {
 }
 
 data class DialogParams(
+  val filename: String? = null,
   val allowMultiple: Boolean = false,
   val fileFilter: ((File?) -> Boolean)? = null,
   val fileFilterDescription: String = "",

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/platform/Files.desktop.kt

@@ -37,15 +37,19 @@ actual class FileChooserLauncher actual constructor() {
   }
 
   actual suspend fun launch(input: String) {
-    val res = if (getContent) {
+    var res: File?
+    if (getContent) {
       val params = DialogParams(
         allowMultiple = false,
         fileFilter = fileFilter(input),
         fileFilterDescription = fileFilterDescription(input),
       )
-      simplexWindowState.openDialog.awaitResult(params)
+      res = simplexWindowState.openDialog.awaitResult(params)
     } else {
-      simplexWindowState.saveDialog.awaitResult()
+      res = simplexWindowState.saveDialog.awaitResult(DialogParams(filename = input))
+      if (res != null && res.isDirectory) {
+        res = File(res, input)
+      }
     }
     onResult(res?.toURI())
   }

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/views/helpers/DefaultDialog.desktop.kt

@@ -41,9 +41,9 @@ fun FrameWindowScope.FileDialogChooser(
   onResult: (result: List<File>) -> Unit
 ) {
   if (isLinux()) {
-    FileDialogChooserMultiple(title, isLoad, params.allowMultiple, params.fileFilter, params.fileFilterDescription, onResult)
+    FileDialogChooserMultiple(title, isLoad, params.filename, params.allowMultiple, params.fileFilter, params.fileFilterDescription, onResult)
   } else {
-    FileDialogAwt(title, isLoad, params.allowMultiple, params.fileFilter, onResult)
+    FileDialogAwt(title, isLoad, params.filename, params.allowMultiple, params.fileFilter, onResult)
   }
 }
 
@@ -51,6 +51,7 @@ fun FrameWindowScope.FileDialogChooser(
 fun FrameWindowScope.FileDialogChooserMultiple(
   title: String,
   isLoad: Boolean,
+  filename: String?,
   allowMultiple: Boolean,
   fileFilter: ((File?) -> Boolean)? = null,
   fileFilterDescription: String? = null,
@@ -73,7 +74,11 @@ fun FrameWindowScope.FileDialogChooserMultiple(
       val returned = if (isLoad) {
         fileChooser.showOpenDialog(window)
       } else {
-        fileChooser.fileSelectionMode = JFileChooser.DIRECTORIES_ONLY
+        if (filename != null) {
+          fileChooser.selectedFile = File(filename)
+        } else {
+          fileChooser.fileSelectionMode = JFileChooser.DIRECTORIES_ONLY
+        }
         fileChooser.showSaveDialog(window)
       }
       val result = when (returned) {
@@ -109,6 +114,7 @@ fun FrameWindowScope.FileDialogChooserMultiple(
 private fun FrameWindowScope.FileDialogAwt(
   title: String,
   isLoad: Boolean,
+  filename: String?,
   allowMultiple: Boolean,
   fileFilter: ((File?) -> Boolean)? = null,
   onResult: (result: List<File>) -> Unit
@@ -128,6 +134,9 @@ private fun FrameWindowScope.FileDialogAwt(
     }.apply {
       this.title = title
       this.isMultipleMode = allowMultiple && isLoad
+      if (!isLoad && filename != null) {
+        this.file = filename
+      }
       if (fileFilter != null) {
         this.setFilenameFilter { dir, file ->
           fileFilter(File(dir.absolutePath + File.separator + file))

apps/multiplatform/desktop/src/jvmMain/kotlin/chat/simplex/desktop/Main.kt

@@ -10,6 +10,7 @@ fun main() {
   initHaskell()
   initApp()
   tmpDir.deleteRecursively()
+  tmpDir.mkdir()
   return showApp()
 }