Move some temporary code to separated package

app/src/main/java/com/hippo/ehviewer/EhApplication.kt

@@ -37,6 +37,7 @@ import com.hippo.ehviewer.coil.MergeInterceptor
 import com.hippo.ehviewer.dailycheck.checkDawn
 import com.hippo.ehviewer.dao.buildMainDB
 import com.hippo.ehviewer.download.DownloadManager
+import com.hippo.ehviewer.legacy.cleanObsoleteCache
 import com.hippo.ehviewer.ui.CommonOperations
 import com.hippo.ehviewer.ui.EhActivity
 import com.hippo.util.ExceptionUtils
@@ -51,7 +52,6 @@ import io.ktor.client.engine.okhttp.OkHttp
 import kotlinx.coroutines.DelicateCoroutinesApi
 import okhttp3.OkHttpClient
 import okio.Path.Companion.toOkioPath
-import java.io.File
 import java.net.Proxy
 import java.security.KeyStore
 import javax.net.ssl.TrustManagerFactory
@@ -109,24 +109,11 @@ class EhApplication : Application(), DefaultLifecycleObserver, ImageLoaderFactor
                     checkDawn()
                 }
             }
-            launchIO {
-                cleanObsoleteCache()
-            }
         }
+        cleanObsoleteCache(this)
         mIdGenerator.setNextId(Settings.getInt(KEY_GLOBAL_STUFF_NEXT_ID, 0))
     }
 
-    // TODO: Remove this after a few releases
-    private fun cleanObsoleteCache() {
-        val dir = cacheDir
-        for (subdir in OBSOLETE_CACHE_DIRS) {
-            val file = File(dir, subdir)
-            if (file.exists()) {
-                file.deleteRecursively()
-            }
-        }
-    }
-
     private fun cleanupDownload() {
         try {
             val downloadLocation = Settings.downloadLocation
@@ -219,15 +206,6 @@ class EhApplication : Application(), DefaultLifecycleObserver, ImageLoaderFactor
         var locked = true
         var locked_last_leave_time: Long = 0
 
-        private val OBSOLETE_CACHE_DIRS = arrayOf(
-            "image",
-            "thumb",
-            "http_cache",
-            "image_cache",
-            "gallery_image",
-            "spider_info"
-        )
-
         @JvmStatic
         lateinit var application: EhApplication
             private set

app/src/main/java/com/hippo/ehviewer/legacy/CleanupObsoleteCache.kt

@@ -0,0 +1,28 @@
+package com.hippo.ehviewer.legacy
+
+import android.app.Application
+import eu.kanade.tachiyomi.util.lang.launchIO
+import kotlinx.coroutines.DelicateCoroutinesApi
+import java.io.File
+
+private val OBSOLETE_CACHE_DIRS = arrayOf(
+    "image",
+    "thumb",
+    "http_cache",
+    "image_cache",
+    "gallery_image",
+    "spider_info"
+)
+
+@OptIn(DelicateCoroutinesApi::class)
+fun cleanObsoleteCache(application: Application) {
+    launchIO {
+        val dir = application.cacheDir
+        for (subdir in OBSOLETE_CACHE_DIRS) {
+            val file = File(dir, subdir)
+            if (file.exists()) {
+                file.deleteRecursively()
+            }
+        }
+    }
+}