Refactor away some unnecessary lambda expressions

app/src/main/java/eu/kanade/core/util/CollectionUtils.kt

@@ -12,10 +12,10 @@ fun <T : R, R : Any> List<T>.insertSeparators(
     val newList = mutableListOf<R>()
     for (i in -1..lastIndex) {
         val before = getOrNull(i)
-        before?.let { newList.add(it) }
+        before?.let(newList::add)
         val after = getOrNull(i + 1)
         val separator = generator.invoke(before, after)
-        separator?.let { newList.add(it) }
+        separator?.let(newList::add)
     }
     return newList
 }
@@ -80,7 +80,7 @@ inline fun <T, R> List<T>.fastMapNotNull(transform: (T) -> R?): List<R> {
     contract { callsInPlace(transform) }
     val destination = ArrayList<R>()
     fastForEach { element ->
-        transform(element)?.let { destination.add(it) }
+        transform(element)?.let(destination::add)
     }
     return destination
 }

app/src/main/java/eu/kanade/presentation/browse/GlobalSearchScreen.kt

@@ -96,7 +96,7 @@ private fun GlobalSearchContent(
 
                             GlobalSearchCardRow(
                                 titles = result.result,
-                                getManga = { getManga(it) },
+                                getManga = getManga,
                                 onClick = onClickItem,
                                 onLongClick = onLongClickItem,
                             )

app/src/main/java/eu/kanade/presentation/browse/MigrateSearchScreen.kt

@@ -85,7 +85,7 @@ private fun MigrateSearchContent(
 
                             GlobalSearchCardRow(
                                 titles = result.result,
-                                getManga = { getManga(it) },
+                                getManga = getManga,
                                 onClick = onClickItem,
                                 onLongClick = onLongClickItem,
                             )

app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt

@@ -141,7 +141,7 @@ class BackupManager(
             .map(Manga::source)
             .distinct()
             .map(sourceManager::getOrStub)
-            .map { BackupSource.copyFrom(it) }
+            .map(BackupSource::copyFrom)
             .toList()
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/base/delegate/SecureActivityDelegate.kt

@@ -97,7 +97,7 @@ class SecureActivityDelegateImpl : SecureActivityDelegate, DefaultLifecycleObser
             secureScreen == SecurityPreferences.SecureScreenMode.ALWAYS ||
                 secureScreen == SecurityPreferences.SecureScreenMode.INCOGNITO && incognitoMode
         }
-            .onEach { activity.window.setSecureScreen(it) }
+            .onEach(activity.window::setSecureScreen)
             .launchIn(activity.lifecycleScope)
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/base/delegate/ThemingDelegate.kt

@@ -62,6 +62,6 @@ class ThemingDelegateImpl : ThemingDelegate {
     override fun applyAppTheme(activity: Activity) {
         val uiPreferences = Injekt.get<UiPreferences>()
         ThemingDelegate.getThemeResIds(uiPreferences.appTheme().get(), uiPreferences.themeDarkAmoled().get())
-            .forEach { activity.setTheme(it) }
+            .forEach(activity::setTheme)
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionFilterScreen.kt

@@ -34,7 +34,7 @@ class ExtensionFilterScreen : Screen() {
         ExtensionFilterScreen(
             navigateUp = navigator::pop,
             state = successState,
-            onClickToggle = { screenModel.toggle(it) },
+            onClickToggle = screenModel::toggle,
         )
 
         LaunchedEffect(Unit) {

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionsScreenModel.kt

@@ -141,7 +141,7 @@ class ExtensionsScreenModel(
                             else -> it.extension
                         }
                     }
-                    .forEach { updateExtension(it) }
+                    .forEach(::updateExtension)
             }
         }
     }

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/details/ExtensionDetailsScreen.kt

@@ -40,9 +40,9 @@ data class ExtensionDetailsScreen(
             onClickReadme = { uriHandler.openUri(screenModel.getReadmeUrl()) },
             onClickEnableAll = { screenModel.toggleSources(true) },
             onClickDisableAll = { screenModel.toggleSources(false) },
-            onClickClearCookies = { screenModel.clearCookies() },
-            onClickUninstall = { screenModel.uninstallExtension() },
-            onClickSource = { screenModel.toggleSource(it) },
+            onClickClearCookies = screenModel::clearCookies,
+            onClickUninstall = screenModel::uninstallExtension,
+            onClickSource = screenModel::toggleSource,
         )
 
         LaunchedEffect(Unit) {

app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/search/SourceSearchScreen.kt

@@ -58,7 +58,7 @@ data class SourceSearchScreen(
                     searchQuery = state.toolbarQuery ?: "",
                     onChangeSearchQuery = screenModel::setToolbarQuery,
                     onClickCloseSearch = navigator::pop,
-                    onSearch = { screenModel.search(it) },
+                    onSearch = screenModel::search,
                     scrollBehavior = scrollBehavior,
                 )
             },

app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourceScreen.kt

@@ -126,7 +126,7 @@ data class BrowseSourceScreen(
                         onWebViewClick = onWebViewClick,
                         onHelpClick = onHelpClick,
                         onSettingsClick = { navigator.push(SourcePreferencesScreen(sourceId)) },
-                        onSearch = { screenModel.search(it) },
+                        onSearch = screenModel::search,
                     )
 
                     Row(
@@ -235,15 +235,9 @@ data class BrowseSourceScreen(
                 SourceFilterDialog(
                     onDismissRequest = onDismissRequest,
                     filters = state.filters,
-                    onReset = {
-                        screenModel.resetFilters()
-                    },
-                    onFilter = {
-                        screenModel.search(filters = state.filters)
-                    },
-                    onUpdate = {
-                        screenModel.setFilters(it)
-                    },
+                    onReset = screenModel::resetFilters,
+                    onFilter = { screenModel.search(filters = state.filters) },
+                    onUpdate = screenModel::setFilters,
                 )
             }
             is BrowseSourceScreenModel.Dialog.AddDuplicateManga -> {

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryTab.kt

@@ -117,7 +117,7 @@ object LibraryTab : Tab {
                     onClickUnselectAll = screenModel::clearSelection,
                     onClickSelectAll = { screenModel.selectAll(screenModel.activeCategoryIndex) },
                     onClickInvertSelection = { screenModel.invertSelection(screenModel.activeCategoryIndex) },
-                    onClickFilter = { screenModel.showSettingsDialog() },
+                    onClickFilter = screenModel::showSettingsDialog,
                     onClickRefresh = { onClickRefresh(state.categories[screenModel.activeCategoryIndex]) },
                     onClickGlobalUpdate = { onClickRefresh(null) },
                     onClickOpenRandomManga = {
@@ -186,7 +186,7 @@ object LibraryTab : Tab {
                             }
                             Unit
                         }.takeIf { state.showMangaContinueButton },
-                        onToggleSelection = { screenModel.toggleSelection(it) },
+                        onToggleSelection = screenModel::toggleSelection,
                         onToggleRangeSelection = {
                             screenModel.toggleRangeSelection(it)
                             haptic.performHapticFeedback(HapticFeedbackType.LongPress)

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

@@ -1039,29 +1039,29 @@ class ReaderActivity : BaseActivity() {
                 .launchIn(lifecycleScope)
 
             readerPreferences.showPageNumber().changes()
-                .onEach { setPageNumberVisibility(it) }
+                .onEach(::setPageNumberVisibility)
                 .launchIn(lifecycleScope)
 
             readerPreferences.trueColor().changes()
-                .onEach { setTrueColor(it) }
+                .onEach(::setTrueColor)
                 .launchIn(lifecycleScope)
 
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                 readerPreferences.cutoutShort().changes()
-                    .onEach { setCutoutShort(it) }
+                    .onEach(::setCutoutShort)
                     .launchIn(lifecycleScope)
             }
 
             readerPreferences.keepScreenOn().changes()
-                .onEach { setKeepScreenOn(it) }
+                .onEach(::setKeepScreenOn)
                 .launchIn(lifecycleScope)
 
             readerPreferences.customBrightness().changes()
-                .onEach { setCustomBrightness(it) }
+                .onEach(::setCustomBrightness)
                 .launchIn(lifecycleScope)
 
             readerPreferences.colorFilter().changes()
-                .onEach { setColorFilter(it) }
+                .onEach(::setColorFilter)
                 .launchIn(lifecycleScope)
 
             readerPreferences.colorFilterMode().changes()
@@ -1138,7 +1138,7 @@ class ReaderActivity : BaseActivity() {
             if (enabled) {
                 readerPreferences.customBrightnessValue().changes()
                     .sample(100)
-                    .onEach { setCustomBrightnessValue(it) }
+                    .onEach(::setCustomBrightnessValue)
                     .launchIn(lifecycleScope)
             } else {
                 setCustomBrightnessValue(0)
@@ -1152,7 +1152,7 @@ class ReaderActivity : BaseActivity() {
             if (enabled) {
                 readerPreferences.colorFilterValue().changes()
                     .sample(100)
-                    .onEach { setColorFilterValue(it) }
+                    .onEach(::setColorFilterValue)
                     .launchIn(lifecycleScope)
             } else {
                 binding.colorOverlay.isVisible = false

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

@@ -33,7 +33,7 @@ class ReaderColorFilterSettings @JvmOverloads constructor(context: Context, attr
         addView(binding.root)
 
         readerPreferences.colorFilter().changes()
-            .onEach { setColorFilter(it) }
+            .onEach(::setColorFilter)
             .launchIn((context as ReaderActivity).lifecycleScope)
 
         readerPreferences.colorFilterMode().changes()
@@ -41,7 +41,7 @@ class ReaderColorFilterSettings @JvmOverloads constructor(context: Context, attr
             .launchIn(context.lifecycleScope)
 
         readerPreferences.customBrightness().changes()
-            .onEach { setCustomBrightness(it) }
+            .onEach(::setCustomBrightness)
             .launchIn(context.lifecycleScope)
 
         // Get color and update values
@@ -141,7 +141,7 @@ class ReaderColorFilterSettings @JvmOverloads constructor(context: Context, attr
         if (enabled) {
             readerPreferences.customBrightnessValue().changes()
                 .sample(100)
-                .onEach { setCustomBrightnessValue(it) }
+                .onEach(::setCustomBrightnessValue)
                 .launchIn((context as ReaderActivity).lifecycleScope)
         } else {
             setCustomBrightnessValue(0, true)
@@ -169,7 +169,7 @@ class ReaderColorFilterSettings @JvmOverloads constructor(context: Context, attr
         if (enabled) {
             readerPreferences.colorFilterValue().changes()
                 .sample(100)
-                .onEach { setColorFilterValue(it) }
+                .onEach(::setColorFilterValue)
                 .launchIn((context as ReaderActivity).lifecycleScope)
         }
         setColorFilterSeekBar(enabled)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerTransitionHolder.kt

@@ -63,7 +63,7 @@ class PagerTransitionHolder(
 
         transitionView.bind(transition, viewer.downloadManager, viewer.activity.viewModel.manga)
 
-        transition.to?.let { observeStatus(it) }
+        transition.to?.let(::observeStatus)
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerViewer.kt

@@ -74,9 +74,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
                     setChaptersInternal(viewerChapters)
                     awaitingIdleViewerChapters = null
                     if (viewerChapters.currChapter.pages?.size == 1) {
-                        adapter.nextTransition?.to?.let {
-                            activity.requestPreloadChapter(it)
-                        }
+                        adapter.nextTransition?.to?.let(activity::requestPreloadChapter)
                     }
                 }
             }
@@ -234,9 +232,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
         val inPreloadRange = pages.size - page.number < 5
         if (inPreloadRange && allowPreload && page.chapter == adapter.currentChapter) {
             logcat { "Request preload next chapter because we're at page ${page.number} of ${pages.size}" }
-            adapter.nextTransition?.to?.let {
-                activity.requestPreloadChapter(it)
-            }
+            adapter.nextTransition?.to?.let(activity::requestPreloadChapter)
         }
     }
 
@@ -320,7 +316,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
      */
     protected open fun moveRight() {
         if (pager.currentItem != adapter.count - 1) {
-            val holder = (currentPage as? ReaderPage)?.let { getPageHolder(it) }
+            val holder = (currentPage as? ReaderPage)?.let(::getPageHolder)
             if (holder != null && config.navigateToPan && holder.canPanRight()) {
                 holder.panRight()
             } else {
@@ -334,7 +330,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
      */
     protected open fun moveLeft() {
         if (pager.currentItem != 0) {
-            val holder = (currentPage as? ReaderPage)?.let { getPageHolder(it) }
+            val holder = (currentPage as? ReaderPage)?.let(::getPageHolder)
             if (holder != null && config.navigateToPan && holder.canPanLeft()) {
                 holder.panLeft()
             } else {