feat: remove gmail prefix in folder structure

Author: shamim-emon

legacy/core/src/main/java/com/fsck/k9/controller/MessagingController.java

@@ -1079,6 +1079,10 @@ public void setFlagForThreads(final LegacyAccount account, final List<Long> thre
         );
     }
 
+    public void replaceGmailPrefixFromFolders(LegacyAccount account) {
+        messageStoreManager.getMessageStore(account).removeGmailPrefixFromFolders();
+    }
+
     private void setFlagSynchronous(final LegacyAccount account, final List<Long> ids,
             final Flag flag, final boolean newState, final boolean threadedList) {
 

legacy/mailstore/src/main/java/app/k9mail/legacy/mailstore/ListenableMessageStore.kt

@@ -12,6 +12,10 @@ class ListenableMessageStore(private val messageStore: MessageStore) : MessageSt
         notifyFolderSettingsChanged()
     }
 
+    override fun removeGmailPrefixFromFolders() {
+        messageStore.removeGmailPrefixFromFolders()
+    }
+
     override fun deleteFolders(folderServerIds: List<String>) {
         messageStore.deleteFolders(folderServerIds)
         notifyFolderSettingsChanged()

legacy/mailstore/src/main/java/app/k9mail/legacy/mailstore/MessageStore.kt

@@ -176,6 +176,8 @@ interface MessageStore {
      */
     fun createFolders(folders: List<CreateFolderInfo>)
 
+    fun removeGmailPrefixFromFolders()
+
     /**
      * Retrieve information about a folder.
      *

legacy/storage/src/main/java/com/fsck/k9/storage/messages/K9MessageStore.kt

@@ -142,6 +142,10 @@ class K9MessageStore(
         createFolderOperations.createFolders(folders)
     }
 
+    override fun removeGmailPrefixFromFolders() {
+        updateFolderOperations.removeGmailPrefixFromFolders()
+    }
+
     override fun <T> getFolder(folderId: Long, mapper: FolderMapper<T>): T? {
         return retrieveFolderOperations.getFolder(folderId, mapper)
     }

legacy/storage/src/main/java/com/fsck/k9/storage/messages/UpdateFolderOperations.kt

@@ -19,6 +19,36 @@ internal class UpdateFolderOperations(private val lockableDatabase: LockableData
         }
     }
 
+    fun removeGmailPrefixFromFolders() {
+        lockableDatabase.execute(false) { db ->
+            val cursor = db.query(
+                "folders",
+                arrayOf("id", "name"),
+                "name LIKE ? OR name LIKE ?",
+                arrayOf("%[Gmail]/%", "%[Google Mail]/%"),
+                null,
+                null,
+                null,
+            )
+
+            while (cursor.moveToNext()) {
+                val id = cursor.getLong(cursor.getColumnIndexOrThrow("id"))
+                val name = cursor.getString(cursor.getColumnIndexOrThrow("name"))
+                val updatedName = name
+                    .replace("[Gmail]/", "")
+                    .replace("[Google Mail]/", "")
+
+                val values = ContentValues().apply {
+                    put("name", updatedName)
+                }
+
+                db.update("folders", values, "id = ?", arrayOf(id.toString()))
+            }
+
+            cursor.close()
+        }
+    }
+
     fun updateFolderSettings(folderDetails: FolderDetails) {
         lockableDatabase.execute(false) { db ->
             val contentValues = ContentValues().apply {

legacy/ui/folder/src/main/java/app/k9mail/legacy/ui/folder/DefaultDisplayFolderRepository.kt

@@ -42,7 +42,7 @@ class DefaultDisplayFolderRepository(
             DisplayFolder(
                 folder = Folder(
                     id = folder.id,
-                    name = folder.name,
+                    name = folder.name.replace("\\[(Gmail|Google Mail)]/".toRegex(), ""),
                     type = FolderTypeMapper.folderTypeOf(account, folder.id),
                     isLocalOnly = folder.isLocalOnly,
                 ),

legacy/ui/legacy/src/main/java/com/fsck/k9/ui/messagelist/MessageListFragment.kt

@@ -198,6 +198,10 @@ class MessageListFragment :
         super.onCreate(savedInstanceState)
         setHasOptionsMenu(true)
 
+        accountManager.getAccounts().forEach {
+            messagingController.replaceGmailPrefixFromFolders(it)
+        }
+
         restoreInstanceState(savedInstanceState)
         val error = decodeArguments()
         if (error != null) {