[Feature Request] Option to turn off History - #3772 (#3855)

* Implementing do not save chapter history preference

* Refactor of labels

* Changing incognito mode from Readers section to More

* Fixing imports and removing unused strings

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -179,6 +179,8 @@ object PreferenceKeys {
 
     const val defaultChapterDisplayByNameOrNumber = "default_chapter_display_by_name_or_number"
 
+    const val incognitoMode = "incognito_mode"
+
     fun trackUsername(syncId: Int) = "pref_mangasync_username_$syncId"
 
     fun trackPassword(syncId: Int) = "pref_mangasync_password_$syncId"

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -269,6 +269,8 @@ class PreferencesHelper(val context: Context) {
 
     fun sortChapterByAscendingOrDescending() = prefs.getInt(Keys.defaultChapterSortByAscendingOrDescending, Manga.SORT_DESC)
 
+    fun incognitoMode() = prefs.getBoolean(Keys.incognitoMode, false)
+
     fun setChapterSettingsDefault(manga: Manga) {
         prefs.edit {
             putInt(Keys.defaultChapterFilterByRead, manga.readFilter)

app/src/main/java/eu/kanade/tachiyomi/ui/more/MoreController.kt

@@ -23,6 +23,7 @@ import eu.kanade.tachiyomi.util.preference.preferenceCategory
 import eu.kanade.tachiyomi.util.preference.summaryRes
 import eu.kanade.tachiyomi.util.preference.switchPreference
 import eu.kanade.tachiyomi.util.preference.titleRes
+import eu.kanade.tachiyomi.util.preference.defaultValue
 import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.system.openInBrowser
 import rx.android.schedulers.AndroidSchedulers
@@ -53,6 +54,15 @@ class MoreController :
             iconTint = tintColor
         }
 
+        switchPreference {
+            key = Keys.incognitoMode
+            summaryRes = R.string.pref_incognito_mode_summary
+            titleRes = R.string.pref_incognito_mode
+            iconRes = R.drawable.ic_glasses_black_24dp
+            iconTint = tintColor
+            defaultValue = false
+        }
+
         preferenceCategory {
             preference {
                 titleRes = R.string.label_download_queue

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt

@@ -409,11 +409,13 @@ class ReaderPresenter(
      * Saves this [chapter] last read history.
      */
     private fun saveChapterHistory(chapter: ReaderChapter) {
-        val history = History.create(chapter.chapter).apply { last_read = Date().time }
-        db.updateHistoryLastRead(history).asRxCompletable()
-            .onErrorComplete()
-            .subscribeOn(Schedulers.io())
-            .subscribe()
+        if (!preferences.incognitoMode()) {
+            val history = History.create(chapter.chapter).apply { last_read = Date().time }
+            db.updateHistoryLastRead(history).asRxCompletable()
+                .onErrorComplete()
+                .subscribeOn(Schedulers.io())
+                .subscribe()
+        }
     }
 
     /**