Export backups daily

Fixes #178

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/list/ListHabitsActivity.kt

@@ -24,12 +24,15 @@ import org.isoron.uhabits.*
 import org.isoron.uhabits.activities.*
 import org.isoron.uhabits.activities.habits.list.views.*
 import org.isoron.uhabits.core.preferences.*
+import org.isoron.uhabits.core.tasks.*
 import org.isoron.uhabits.core.ui.ThemeSwitcher.*
 import org.isoron.uhabits.core.utils.*
+import org.isoron.uhabits.database.*
 
 class ListHabitsActivity : HabitsActivity() {
 
     var pureBlack: Boolean = false
+    lateinit var taskRunner: TaskRunner
     lateinit var adapter: HabitCardListAdapter
     lateinit var rootView: ListHabitsRootView
     lateinit var screen: ListHabitsScreen
@@ -44,6 +47,7 @@ class ListHabitsActivity : HabitsActivity() {
         rootView = component.listHabitsRootView
         screen = component.listHabitsScreen
         adapter = component.habitCardListAdapter
+        taskRunner = appComponent.taskRunner
 
         setScreen(screen)
         component.listHabitsBehavior.onStartup()
@@ -62,6 +66,9 @@ class ListHabitsActivity : HabitsActivity() {
         screen.onAttached()
         rootView.postInvalidate()
         midnightTimer.onResume()
+        taskRunner.run {
+            AutoBackup(this@ListHabitsActivity).run()
+        }
 
         if (prefs.theme == THEME_DARK && prefs.isPureBlackEnabled != pureBlack) {
             restartWithFade(ListHabitsActivity::class.java)

android/uhabits-android/src/main/java/org/isoron/uhabits/database/AutoBackup.kt

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2016-2020 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.isoron.uhabits.database
+
+import android.content.*
+import android.util.*
+import org.isoron.androidbase.*
+import org.isoron.uhabits.core.utils.*
+import org.isoron.uhabits.utils.*
+import java.io.*
+
+class AutoBackup(private val context: Context) {
+
+    private val basedir = AndroidDirFinder(context).getFilesDir("Backups")!!
+
+    fun run(keep: Int = 5) {
+        val files = listBackupFiles()
+        var newestTimestamp = 0L;
+        if (files.isNotEmpty()) {
+            newestTimestamp = files.last().lastModified()
+        }
+        val todayTimestamp = DateUtils.getStartOfToday()
+        removeOldest(files, keep)
+        if (todayTimestamp - newestTimestamp > DateUtils.DAY_LENGTH) {
+            DatabaseUtils.saveDatabaseCopy(context, basedir)
+        }
+    }
+
+    private fun removeOldest(files: ArrayList<File>, keep: Int) {
+        files.sortBy { -it.lastModified() }
+        for (k in keep until files.size) {
+            Log.i("AutoBackup", "Removing ${files[k]}")
+            files[k].delete()
+        }
+    }
+
+    private fun listBackupFiles(): ArrayList<File> {
+        val files = ArrayList<File>()
+        for (path in basedir.list()!!) {
+            files.add(File("${basedir.path}/$path"))
+        }
+        return files
+    }
+}

android/uhabits-android/src/main/java/org/isoron/uhabits/utils/DatabaseUtils.java

@@ -21,6 +21,7 @@ package org.isoron.uhabits.utils;
 
 import android.content.*;
 import android.database.sqlite.*;
+import android.util.*;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -28,6 +29,7 @@ import androidx.annotation.Nullable;
 import org.isoron.androidbase.utils.*;
 import org.isoron.uhabits.*;
 import org.isoron.uhabits.core.*;
+import org.isoron.uhabits.core.Config;
 import org.isoron.uhabits.core.utils.*;
 
 import java.io.*;
@@ -97,6 +99,7 @@ public abstract class DatabaseUtils
         String date = dateFormat.format(DateUtils.getLocalTime());
         String format = "%s/Loop Habits Backup %s.db";
         String filename = String.format(format, dir.getAbsolutePath(), date);
+        Log.i("DatabaseUtils", "Writing: " + filename);
 
         File db = getDatabaseFile(context);
         File dbCopy = new File(filename);