Add first draft of "Show diff"(Help me pls!)

app/src/main/java/com/orgzly/android/ui/books/BooksFragment.kt

@@ -278,6 +278,10 @@ class BooksFragment : Fragment(), DrawerItem, OnViewHolderClickListener<BookView
                     R.id.books_context_menu_delete -> {
                         viewModel.deleteBookRequest(bookId)
                     }
+
+                    R.id.books_context_menu_show_diff -> {
+                        viewModel.showDiffBookRequest(bookId)
+                    }
                 }
 
                 viewModel.appBar.toMode(APP_BAR_DEFAULT_MODE)
@@ -305,6 +309,35 @@ class BooksFragment : Fragment(), DrawerItem, OnViewHolderClickListener<BookView
         pickFileForBookExport.launch(defaultFileName)
     }
 
+    private fun showDiffDialog(book: BookView) {
+        val dialogBinding = DialogBookDeleteBinding.inflate(LayoutInflater.from(context))
+
+        dialogBinding.deleteLinkedCheckbox.setOnCheckedChangeListener { _, isChecked ->
+            dialogBinding.deleteLinkedUrl.isEnabled = isChecked
+        }
+
+        val dialogClickListener = DialogInterface.OnClickListener { _, which ->
+            when (which) {
+                DialogInterface.BUTTON_POSITIVE -> {
+                    val deleteLinked = dialogBinding.deleteLinkedCheckbox.isChecked
+                    viewModel.deleteBook(book.book.id, deleteLinked)
+                }
+            }
+        }
+
+        val builder = MaterialAlertDialogBuilder(requireContext())
+            .setTitle(getString(R.string.delete_with_quoted_argument, book.book.name))
+            .setPositiveButton(R.string.delete, dialogClickListener)
+            .setNegativeButton(R.string.cancel, dialogClickListener)
+
+        if (book.syncedTo != null) {
+            dialogBinding.deleteLinkedUrl.text = book.syncedTo.uri.toString()
+            builder.setView(dialogBinding.root)
+        }
+
+        dialog = builder.show()
+    }
+
     private fun deleteBookDialog(book: BookView) {
         val dialogBinding = DialogBookDeleteBinding.inflate(LayoutInflater.from(context))
 
@@ -427,6 +460,12 @@ class BooksFragment : Fragment(), DrawerItem, OnViewHolderClickListener<BookView
             }
         })
 
+        viewModel.showDiffEvent.observeSingle(viewLifecycleOwner, Observer { bookView ->
+            if (bookView != null) {
+                showDiffDialog(bookView)
+            }
+        })
+
         viewModel.bookToRenameEvent.observeSingle(viewLifecycleOwner, Observer { bookView ->
             if (bookView != null) {
                 renameBookDialog(bookView)

app/src/main/java/com/orgzly/android/ui/books/BooksViewModel.kt

@@ -30,7 +30,7 @@ class BooksViewModel(private val dataRepository: DataRepository) : CommonViewMod
     val bookToExportEvent: SingleLiveEvent<Pair<Book, BookFormat>> = SingleLiveEvent()
     val bookExportedEvent: SingleLiveEvent<String> = SingleLiveEvent()
     val setBookLinkRequestEvent: SingleLiveEvent<BookLinkOptions> = SingleLiveEvent()
-
+    val showDiffEvent: SingleLiveEvent<BookView> = SingleLiveEvent()
 
     enum class ViewState {
         LOADING,
@@ -70,6 +70,12 @@ class BooksViewModel(private val dataRepository: DataRepository) : CommonViewMod
         }
     }
 
+    fun showDiffBookRequest(bookId: Long) {
+        App.EXECUTORS.diskIO().execute {
+            showDiffEvent.postValue(dataRepository.getBookView(bookId))
+        }
+    }
+
     fun deleteBook(bookId: Long, deleteLinked: Boolean) {
         App.EXECUTORS.diskIO().execute {
             catchAndPostError {

app/src/main/res/menu/books_cab.xml

@@ -40,4 +40,10 @@
         app:showAsAction="never">
     </item>
 
+    <item
+        android:id="@+id/books_context_menu_show_diff"
+        android:title="Show diff"
+        app:showAsAction="never">
+    </item>
+
 </menu>