优化

app/src/main/java/io/legado/app/data/dao/BookSourceDao.kt

@@ -276,6 +276,9 @@ interface BookSourceDao {
     @Query("select count(*) from book_sources")
     fun allCount(): Int
 
+    @Query("SELECT EXISTS(select 1 from book_sources where bookSourceUrl = :key)")
+    fun has(key: String): Boolean
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg bookSource: BookSource)
 

app/src/main/java/io/legado/app/ui/book/info/BookInfoActivity.kt

@@ -429,6 +429,10 @@ class BookInfoActivity :
         tvOrigin.setOnClickListener {
             viewModel.getBook()?.let { book ->
                 if (book.isLocal) return@let
+                if (!appDb.bookSourceDao.has(book.origin)) {
+                    toastOnUi(R.string.error_no_source)
+                    return@let
+                }
                 editSourceResult.launch {
                     putExtra("sourceUrl", book.origin)
                 }

app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt

@@ -73,8 +73,16 @@ class BookshelfViewModel(application: Application) : BaseViewModel(application)
                 kotlin.runCatching {
                     WebBook.getBookInfoAwait(bookSource, book)
                 }.onSuccess {
-                    it.order = appDb.bookDao.minOrder - 1
-                    it.save()
+                    val dbBook = appDb.bookDao.getBook(it.name, it.author)
+                    if (dbBook != null) {
+                        val toc = WebBook.getChapterListAwait(bookSource, it).getOrThrow()
+                        dbBook.migrateTo(it, toc)
+                        appDb.bookDao.insert(it)
+                        appDb.bookChapterDao.insert(*toc.toTypedArray())
+                    } else {
+                        it.order = appDb.bookDao.minOrder - 1
+                        it.save()
+                    }
                     successCount++
                     addBookProgressLiveData.postValue(successCount)
                 }