remove unused extracted main dictionaries

app/src/main/java/org/dslul/openboard/inputmethod/latin/BinaryDictionaryGetter.java

@@ -16,14 +16,10 @@ import android.util.Log;
 import org.dslul.openboard.inputmethod.latin.common.FileUtils;
 import org.dslul.openboard.inputmethod.latin.common.LocaleUtils;
 import org.dslul.openboard.inputmethod.latin.define.DecoderSpecificConstants;
-import org.dslul.openboard.inputmethod.latin.makedict.DictionaryHeader;
-import org.dslul.openboard.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.utils.BinaryDictionaryUtils;
 import org.dslul.openboard.inputmethod.latin.utils.DictionaryInfoUtils;
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.BufferUnderflowException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -278,8 +274,7 @@ final public class BinaryDictionaryGetter {
         // we have a match, now copy contents of the dictionary to cached word lists folder
         final String bestMatchLocale = extractLocaleFromAssetsDictionaryFile(bestMatchName);
         if (bestMatchLocale == null) return null;
-        File dictFile = new File(DictionaryInfoUtils.getCacheDirectoryForLocale(locale, context) +
+        File dictFile = DictionaryInfoUtils.getMainDictFile(locale, context);
-                File.separator + DictionaryInfoUtils.getMainDictFilename(locale));
         if (dictFile.exists())
             return dictFile;
         try {

app/src/main/java/org/dslul/openboard/inputmethod/latin/settings/LanguageFilterList.kt

@@ -26,7 +26,7 @@ import org.dslul.openboard.inputmethod.latin.utils.SubtypeLocaleUtils
 import org.dslul.openboard.inputmethod.latin.utils.showMissingDictionaryDialog
 import org.dslul.openboard.inputmethod.latin.utils.toLocale
 
-class LanguageFilterListFakePreference(searchField: EditText, recyclerView: RecyclerView) {
+class LanguageFilterList(searchField: EditText, recyclerView: RecyclerView) {
 
     private val adapter = LanguageAdapter(emptyList(), recyclerView.context)
     private val sortedSubtypes = mutableListOf<MutableList<SubtypeInfo>>()

app/src/main/java/org/dslul/openboard/inputmethod/latin/settings/LanguageSettingsFragment.kt

@@ -31,7 +31,7 @@ class LanguageSettingsFragment : Fragment(R.layout.language_settings) {
     private val sortedSubtypes = LinkedHashMap<String, MutableList<SubtypeInfo>>()
     private val enabledSubtypes = mutableListOf<InputMethodSubtype>()
     private val systemLocales = mutableListOf<Locale>()
-    private lateinit var languageFilterList: LanguageFilterListFakePreference
+    private lateinit var languageFilterList: LanguageFilterList
     private lateinit var sharedPreferences: SharedPreferences
     private lateinit var systemOnlySwitch: SwitchCompat
     private val dictionaryLocales by lazy { getDictionaryLocales(requireContext()).mapTo(HashSet()) { it.languageConsideringZZ() } }
@@ -66,7 +66,7 @@ class LanguageSettingsFragment : Fragment(R.layout.language_settings) {
             enabledSubtypes.addAll(getEnabledSubtypes(sharedPreferences))
             loadSubtypes(b)
         }
-        languageFilterList = LanguageFilterListFakePreference(view.findViewById(R.id.search_field), view.findViewById(R.id.language_list))
+        languageFilterList = LanguageFilterList(view.findViewById(R.id.search_field), view.findViewById(R.id.language_list))
         loadSubtypes(systemOnlySwitch.isChecked)
         return view
     }

app/src/main/java/org/dslul/openboard/inputmethod/latin/settings/SettingsFragment.java

@@ -33,6 +33,8 @@ import org.dslul.openboard.inputmethod.latin.R;
 import org.dslul.openboard.inputmethod.latin.common.FileUtils;
 import org.dslul.openboard.inputmethod.latin.utils.ApplicationUtils;
 import org.dslul.openboard.inputmethod.latin.utils.DeviceProtectedUtils;
+import org.dslul.openboard.inputmethod.latin.utils.DictionaryUtilsKt;
+import org.dslul.openboard.inputmethod.latin.utils.ExecutorUtils;
 import org.dslul.openboard.inputmethod.latin.utils.FeedbackUtils;
 import org.dslul.openboard.inputmethod.latin.utils.JniUtils;
 
@@ -71,6 +73,8 @@ public final class SettingsFragment extends PreferenceFragmentCompat {
             final Preference gesturePreference = findPreference(Settings.SCREEN_GESTURE);
             preferenceScreen.removePreference(gesturePreference);
         }
+        ExecutorUtils.getBackgroundExecutor(ExecutorUtils.KEYBOARD)
+                .execute(() -> DictionaryUtilsKt.cleanUnusedMainDicts(requireContext()));
     }
 
     @Override

app/src/main/java/org/dslul/openboard/inputmethod/latin/utils/DictionaryInfoUtils.java

@@ -299,6 +299,11 @@ public class DictionaryInfoUtils {
         return MAIN_DICT_PREFIX + locale.toLowerCase(Locale.ENGLISH) + ".dict";
     }
 
+    public static File getMainDictFile(@NonNull final String locale, @NonNull final Context context) {
+        return new File(DictionaryInfoUtils.getCacheDirectoryForLocale(locale, context) +
+                File.separator + DictionaryInfoUtils.getMainDictFilename(locale));
+    }
+
     @Nullable
     public static DictionaryHeader getDictionaryFileHeaderOrNull(final File file,
             final long offset, final long length) {

app/src/main/java/org/dslul/openboard/inputmethod/latin/utils/DictionaryUtils.kt

@@ -11,6 +11,9 @@ import androidx.core.content.edit
 import org.dslul.openboard.inputmethod.latin.BinaryDictionaryGetter
 import org.dslul.openboard.inputmethod.latin.R
 import org.dslul.openboard.inputmethod.latin.settings.Settings
+import org.dslul.openboard.inputmethod.latin.settings.getEnabledSubtypes
+import org.dslul.openboard.inputmethod.latin.settings.locale
+import java.io.File
 import java.util.*
 import kotlin.collections.HashSet
 
@@ -68,4 +71,23 @@ fun showMissingDictionaryDialog(context: Context, locale: Locale) {
     (dialog.findViewById<View>(android.R.id.message) as? TextView)?.movementMethod = LinkMovementMethod.getInstance()
 }
 
+fun cleanUnusedMainDicts(context: Context) {
+    val dictionaryDir = File(DictionaryInfoUtils.getWordListCacheDirectory(context))
+    val dirs = dictionaryDir.listFiles() ?: return
+    val prefs = DeviceProtectedUtils.getSharedPreferences(context)
+    val usedLocales = hashSetOf<String>()
+    getEnabledSubtypes(prefs).forEach {
+        val locale = it.locale()
+        usedLocales.add(locale)
+        Settings.getSecondaryLocales(prefs, locale).forEach { usedLocales.add(it.toString().lowercase()) }
+    }
+    for (dir in dirs) {
+        if (!dir.isDirectory) continue
+        if (dir.name in usedLocales) continue
+        if (dir.listFiles()?.any { it.name != DictionaryInfoUtils.getMainDictFilename(dir.name) } != false)
+            continue
+        dir.deleteRecursively()
+    }
+}
+
 const val DICTIONARY_URL = "https://codeberg.org/Helium314/aosp-dictionaries"