fix: opened files cache is always empty when user manually closes the project (#1116)

Author: itsaky

app/src/main/java/com/itsaky/androidide/activities/editor/EditorHandlerActivity.kt

@@ -57,6 +57,7 @@ import com.itsaky.androidide.utils.flashSuccess
 import org.greenrobot.eventbus.Subscribe
 import org.greenrobot.eventbus.ThreadMode
 import java.io.File
+import java.util.concurrent.atomic.AtomicBoolean
 import kotlin.collections.component1
 import kotlin.collections.component2
 import kotlin.collections.set
@@ -68,6 +69,8 @@ import kotlin.collections.set
  */
 open class EditorHandlerActivity : ProjectHandlerActivity(), IEditorHandler {
 
+  protected val isOpenedFilesSaved = AtomicBoolean(false)
+
   override fun doOpenFile(file: File, selection: Range?) {
     openFileAndSelect(file, selection)
   }
@@ -143,19 +146,32 @@ open class EditorHandlerActivity : ProjectHandlerActivity(), IEditorHandler {
   override fun onPause() {
     super.onPause()
 
-    val current =
-      getCurrentEditor()?.editor?.file?.absolutePath
-        ?: run {
-          viewModel.writeOpenedFiles(null)
-          viewModel.openedFilesCache = null
-          return
-        }
+    // if the user manually closes the project, this will be true
+    // in this case, don't overwrite the already saved cache
+    if (!isOpenedFilesSaved.get()) {
+      saveOpenedFiles()
+    }
+  }
+
+  override fun saveOpenedFiles() {
+    writeOpenedFilesCache(getOpenedFiles(), getCurrentEditor()?.editor?.file)
+  }
 
-    getOpenedFiles().also {
-      val cache = OpenedFilesCache(current, it)
-      viewModel.writeOpenedFiles(cache)
-      viewModel.openedFilesCache = if (!isDestroying) cache else null
+  private fun writeOpenedFilesCache(openedFiles: List<OpenedFile>, selectedFile: File?) {
+    if (selectedFile == null || openedFiles.isEmpty()) {
+      viewModel.writeOpenedFiles(null)
+      viewModel.openedFilesCache = null
+      log.debug("[onPause]", "No opened files.", "Opened files cache reset to null.")
+      isOpenedFilesSaved.set(true)
+      return
     }
+
+    val cache = OpenedFilesCache(selectedFile = selectedFile.absolutePath, allFiles = openedFiles)
+
+    viewModel.writeOpenedFiles(cache)
+    viewModel.openedFilesCache = if (!isDestroying) cache else null
+    log.debug("[onPause]", "Opened files cache reset to ${viewModel.openedFilesCache}")
+    isOpenedFilesSaved.set(true)
   }
 
   override fun onStart() {

app/src/main/java/com/itsaky/androidide/activities/editor/ProjectHandlerActivity.kt

@@ -87,6 +87,8 @@ abstract class ProjectHandlerActivity : BaseEditorActivity(), IProjectHandler {
 
   abstract fun doCloseAll(runAfter: () -> Unit)
 
+  abstract fun saveOpenedFiles()
+
   override fun doDismissSearchProgress() {
     if (mSearchingProgress?.isShowing == true) {
       mSearchingProgress!!.dismiss()
@@ -445,6 +447,13 @@ abstract class ProjectHandlerActivity : BaseEditorActivity(), IProjectHandler {
   }
 
   private fun closeProject(manualFinish: Boolean) {
+    if (manualFinish) {
+      // if the user is manually closing the project,
+      // save the opened files cache
+      // this is needed because in this case, the opened files cache will be empty
+      // when onPause will be called.
+      saveOpenedFiles()
+    }
 
     // Make sure we close files
     // This will make sure that file contents are not erased.

app/src/main/java/com/itsaky/androidide/viewmodel/EditorViewModel.kt

@@ -23,9 +23,7 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModel
 import com.blankj.utilcode.util.FileUtils
-import com.google.gson.Gson
 import com.google.gson.GsonBuilder
-import com.google.gson.reflect.TypeToken
 import com.itsaky.androidide.models.OpenedFilesCache
 import com.itsaky.androidide.projects.ProjectManager
 import com.itsaky.androidide.tasks.executeAsync
@@ -168,7 +166,7 @@ class EditorViewModel : ViewModel() {
    * @return The list of opened files.
    */
   fun getOpenedFiles(): List<File> {
-    return files.value!!
+    return files.value ?: mutableListOf()
   }
 
   /**