Add badge to bottom bar Updates tab indicating how many unread chapter updates are available (#5620)

Co-authored-by: arkon <arkon@users.noreply.github.com>

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -68,6 +68,7 @@ import eu.kanade.tachiyomi.util.view.setNavigationBarTransparentCompat
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.merge
 import kotlinx.coroutines.flow.onEach
 import logcat.LogPriority
 
@@ -227,6 +228,10 @@ class MainActivity : BaseViewBindingActivity<MainActivityBinding>() {
             }
         }
 
+        merge(preferences.libraryUpdateShowTabBadge().asFlow(), preferences.libraryUnreadUpdatesCount().asFlow())
+            .onEach { setUnreadUpdatesBadge() }
+            .launchIn(lifecycleScope)
+
         preferences.extensionUpdatesCount()
             .asImmediateFlow { setExtensionsBadge() }
             .launchIn(lifecycleScope)
@@ -349,6 +354,15 @@ class MainActivity : BaseViewBindingActivity<MainActivityBinding>() {
         }
     }
 
+    private fun setUnreadUpdatesBadge() {
+        val updates = if (preferences.libraryUpdateShowTabBadge().get()) preferences.libraryUnreadUpdatesCount().get() else 0
+        if (updates > 0) {
+            nav.getOrCreateBadge(R.id.nav_updates).number = updates
+        } else {
+            nav.removeBadge(R.id.nav_updates)
+        }
+    }
+
     private fun setExtensionsBadge() {
         val updates = preferences.extensionUpdatesCount().get()
         if (updates > 0) {

app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesPresenter.kt

@@ -105,6 +105,9 @@ class UpdatesPresenter : BasePresenter<UpdatesController>() {
                 }
                 setDownloadedChapters(list)
                 chapters = list
+
+                //Set unread chapter count for bottom bar badge
+                preferences.libraryUnreadUpdatesCount().set(list.count { !it.read })
             }
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsLibraryController.kt

@@ -199,6 +199,11 @@ class SettingsLibraryController : SettingsController() {
                 titleRes = R.string.pref_update_only_non_completed
                 defaultValue = false
             }
+            switchPreference {
+                key = Keys.libraryUpdateShowTabBadge
+                titleRes = R.string.pref_library_update_show_tab_badge
+                defaultValue = true
+            }
             preference {
                 key = Keys.libraryUpdateCategories
                 titleRes = R.string.categories