[优化] 阅读本地TXT文本时，编辑可选择覆盖源文件

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

@@ -47,6 +47,9 @@ interface BookChapterDao {
     @Query("update chapters set wordCount = :wordCount where bookUrl = :bookUrl and url = :url")
     fun upWordCount(bookUrl: String, url: String, wordCount: String)
 
+    @Query("update chapters set start = start + :diff, end = end + :diff where bookUrl = :bookUrl and `index` > :index")
+    fun updateOffsets(bookUrl: String, index: Int, diff: Long)
+
     /**
      * 根据书籍的唯一标识 bookUrl 和章节索引 index 查找章节标题。
      */

app/src/main/java/io/legado/app/help/book/BookHelp.kt

@@ -2,6 +2,7 @@ package io.legado.app.help.book
 
 import android.graphics.BitmapFactory
 import android.os.ParcelFileDescriptor
+import android.system.Os
 import androidx.documentfile.provider.DocumentFile
 import com.script.rhino.runScriptWithContext
 import io.legado.app.constant.AppLog
@@ -14,6 +15,7 @@ import io.legado.app.data.entities.BookSource
 import io.legado.app.help.config.AppConfig
 import io.legado.app.model.analyzeRule.AnalyzeUrl
 import io.legado.app.model.localBook.LocalBook
+import io.legado.app.model.localBook.TextFile
 import io.legado.app.utils.ArchiveUtils
 import io.legado.app.utils.FileUtils
 import io.legado.app.utils.ImageUtils
@@ -176,10 +178,19 @@ object BookHelp {
     fun saveText(
         book: Book,
         bookChapter: BookChapter,
-        content: String
+        content: String,
+        saveToSource: Boolean = false
     ) {
         if (content.isEmpty()) return
-        //保存文本
+        if (book.isLocalTxt && saveToSource) {
+            try {
+                saveToLocalTxt(book, bookChapter, content)
+                TextFile.clear()
+            } catch (e: Exception) {
+                AppLog.put("修改本地TXT失败: ${e.localizedMessage}", e)
+            }
+        }
+        // 保存阅读缓存文本(.nb)
         FileUtils.createFileIfNotExist(
             downloadDir,
             cacheFolderName,
@@ -193,6 +204,60 @@ object BookHelp {
         }
     }
 
+    private fun saveToLocalTxt(book: Book, bookChapter: BookChapter, content: String) {
+        val start = bookChapter.start ?: return
+        val end = bookChapter.end ?: return
+        val uri = book.getLocalUri()
+        val charset = book.fileCharset()
+        val oldTitle = bookChapter.title
+        val newContent = oldTitle + "\n" + content
+        val newBytes = newContent.toByteArray(charset)
+        val oldLength = end - start
+        val diff = newBytes.size - oldLength
+
+        val pfd = if (uri.isContentScheme()) {
+            appCtx.contentResolver.openFileDescriptor(uri, "rw")
+        } else {
+            ParcelFileDescriptor.open(File(uri.path!!), ParcelFileDescriptor.MODE_READ_WRITE)
+        }
+
+        pfd?.use {
+            val fd = it.fileDescriptor
+            try {
+                val totalLength = Os.fstat(fd).st_size
+
+                if (diff != 0L) {
+                    val remaining = totalLength - end
+                    if (remaining > 0) {
+                        val buffer = ByteArray(1024 * 1024)
+                        var pos = totalLength
+                        while (pos > end) {
+                            val readSize =
+                                if (pos - end > buffer.size) buffer.size else (pos - end).toInt()
+                            Os.pread(fd, buffer, 0, readSize, pos - readSize)
+                            Os.pwrite(fd, buffer, 0, readSize, pos - readSize + diff)
+                            pos -= readSize
+                        }
+                    }
+                    if (diff < 0) {
+                        Os.ftruncate(fd, totalLength + diff)
+                    }
+                }
+
+                Os.pwrite(fd, newBytes, 0, newBytes.size, start)
+
+                // 更新数据库中的偏移量
+                if (diff != 0L) {
+                    appDb.bookChapterDao.updateOffsets(book.bookUrl, bookChapter.index, diff)
+                }
+                bookChapter.end = start + newBytes.size
+                appDb.bookChapterDao.update(bookChapter)
+            } catch (e: Exception) {
+                throw e
+            }
+        }
+    }
+
     fun flowImages(bookChapter: BookChapter, content: String): Flow<String> {
         return flow {
             val matcher = AppPattern.imgPattern.matcher(content)
@@ -597,7 +662,7 @@ object BookHelp {
 
     private val regexC by lazy {
         //前后附加内容，整个章节名都在括号中时只剔除首尾括号，避免将章节名替换为空字串
-        return@lazy "(?!^)(?:[〖【《〔\\[{(][^〖【《〔\\[{()〕》】〗\\]}]+)?[)〕》】〗\\]}]$|^[〖【《〔\\[{(](?:[^〖【《〔\\[{()〕》】〗\\]}]+[〕》】〗\\]})])?(?!$)".toRegex()
+        return@lazy "(?!^)(?:[〖【《〔\\[{(][^〖【《〔\\[{()〕》》】〗\\]}]+)?[)〕》》】〗\\]}]$|^[〖【《〔\\[{(](?:[^〖【《〔\\[{()〕》》】〗\\]}]+[〕》》】〗\\]})])?(?!$)".toRegex()
     }
 
     private fun getPureChapterName(chapterName: String?): String {

app/src/main/java/io/legado/app/ui/book/read/ContentEditDialog.kt

@@ -3,9 +3,6 @@ package io.legado.app.ui.book.read
 import android.app.Application
 import android.content.DialogInterface
 import android.os.Bundle
-import android.text.Spannable
-import android.text.Spanned
-import android.text.style.BackgroundColorSpan
 import android.view.View
 import androidx.fragment.app.viewModels
 import androidx.lifecycle.MutableLiveData
@@ -20,13 +17,13 @@ import io.legado.app.databinding.DialogEditTextBinding
 import io.legado.app.help.book.BookHelp
 import io.legado.app.help.book.ContentProcessor
 import io.legado.app.help.book.isLocal
+import io.legado.app.help.book.isLocalTxt
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.lib.dialogs.alert
 import io.legado.app.model.ReadBook
 import io.legado.app.model.webBook.WebBook
 import io.legado.app.utils.gone
 import io.legado.app.utils.sendToClip
-import io.legado.app.utils.themeColor
 import io.legado.app.utils.viewbindingdelegate.viewBinding
 import io.legado.app.utils.visible
 import kotlinx.coroutines.Dispatchers.IO
@@ -47,12 +44,16 @@ class ContentEditDialog : BaseBottomSheetDialogFragment(R.layout.dialog_content_
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
         binding.toolBar.title = ReadBook.curTextChapter?.title
+        val book = ReadBook.book
+        if (book?.isLocalTxt == true) {
+            binding.cbSaveToSource.visible()
+        }
         initMenu()
         binding.toolBar.setOnClickListener {
             lifecycleScope.launch {
-                val book = ReadBook.book ?: return@launch
+                val book1 = ReadBook.book ?: return@launch
                 val chapter = withContext(IO) {
-                    appDb.bookChapterDao.getChapter(book.bookUrl, ReadBook.durChapterIndex)
+                    appDb.bookChapterDao.getChapter(book1.bookUrl, ReadBook.durChapterIndex)
                 } ?: return@launch
                 editTitle(chapter)
             }
@@ -119,37 +120,6 @@ class ContentEditDialog : BaseBottomSheetDialogFragment(R.layout.dialog_content_
         }
     }
 
-    private fun highlightSelectedTextTwice() {
-        val editText = binding.contentView
-        val content = editText.text ?: return
-
-        val start = arguments?.getInt("start_position", -1) ?: -1
-        val selectedText = arguments?.getString("selected_text") ?: ""
-
-        if (start == -1 || selectedText.isEmpty()) return
-
-        val end = (start + selectedText.length).coerceAtMost(content.length)
-
-        val spannable = editText.text as Spannable
-        val span =
-            BackgroundColorSpan(requireContext().themeColor(com.google.android.material.R.attr.colorSecondaryContainer))
-
-
-        fun flash(times: Int) {
-            if (times <= 0) return
-            spannable.setSpan(span, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
-            editText.postDelayed({
-                spannable.removeSpan(span)
-                editText.postDelayed({
-                    flash(times - 1)
-                }, 200)
-            }, 300)
-        }
-
-        flash(3)
-    }
-
-
     override fun onCancel(dialog: DialogInterface) {
         super.onCancel(dialog)
         save()
@@ -157,12 +127,13 @@ class ContentEditDialog : BaseBottomSheetDialogFragment(R.layout.dialog_content_
 
     private fun save() {
         val content = binding.contentView.text?.toString() ?: return
+        val saveToSource = binding.cbSaveToSource.isChecked
         Coroutine.async {
             val book = ReadBook.book ?: return@async
             val chapter = appDb.bookChapterDao
                 .getChapter(book.bookUrl, ReadBook.durChapterIndex)
                 ?: return@async
-            BookHelp.saveText(book, chapter, content)
+            BookHelp.saveText(book, chapter, content, saveToSource)
             ReadBook.loadContent(ReadBook.durChapterIndex, resetPageOffset = false)
         }
     }

app/src/main/res/layout/dialog_content_edit.xml

@@ -10,21 +10,32 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:theme="?attr/actionBarStyle"
-        app:title="edit"
+        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:title="edit" />
+
+    <com.google.android.material.materialswitch.MaterialSwitch
+        android:id="@+id/cb_save_to_source"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:text="保存到源文件，保存后重置功能将无效"
+        android:visibility="visible"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/tool_bar" />
 
     <androidx.core.widget.NestedScrollView
         android:id="@+id/scrollView"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:paddingHorizontal="16dp"
-        app:layout_constraintTop_toBottomOf="@id/tool_bar">
+        app:layout_constraintTop_toBottomOf="@id/cb_save_to_source">
 
         <io.legado.app.ui.widget.text.TextInputLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_marginBottom="80dp"
             app:layout_constraintTop_toBottomOf="@+id/tool_bar">
+
             <com.google.android.material.textfield.TextInputEditText
                 android:id="@+id/content_view"
                 android:layout_width="match_parent"
@@ -39,9 +50,9 @@
         android:layout_width="60dp"
         android:layout_height="60dp"
         android:visibility="invisible"
-        app:layout_constraintTop_toBottomOf="@+id/tool_bar"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent" />
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/tool_bar" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>