Add first draft of "Show diff"

Author: Asalle

app/src/main/java/com/orgzly/android/git/GitFileSynchronizer.java

@@ -11,6 +11,8 @@
 import com.orgzly.android.util.MiscUtils;
 
 import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.diff.DiffEntry;
+import org.eclipse.jgit.diff.DiffFormatter;
 import org.eclipse.jgit.api.MergeResult;
 import org.eclipse.jgit.api.ResetCommand;
 import org.eclipse.jgit.api.Status;
@@ -22,12 +24,16 @@
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.treewalk.TreeWalk;
+import org.eclipse.jgit.lib.ObjectReader;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.treewalk.CanonicalTreeParser;
 
 import java.io.File;
 import java.io.IOException;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.TimeZone;
+import java.util.List;
 
 public class GitFileSynchronizer {
     private static String TAG = GitFileSynchronizer.class.getSimpleName();
@@ -330,4 +336,27 @@ public boolean fileMatchesInRevisions(String pathString, RevCommit start, RevCom
             throws IOException {
         return getFileRevision(pathString, start).equals(getFileRevision(pathString, end));
     }
+
+    public void getDiff(ObjectId fileRevision, RevCommit revision) {
+        try {
+            ObjectId oldHead = currentHead().toObjectId(); // aka local
+            ObjectId head = revision.toObjectId(); // aka remote
+            Repository repository = git.getRepository();
+            try (ObjectReader reader = repository.newObjectReader()) {
+                CanonicalTreeParser oldTreeIter = new CanonicalTreeParser();
+                oldTreeIter.reset(reader, oldHead);
+                CanonicalTreeParser newTreeIter = new CanonicalTreeParser();
+                newTreeIter.reset(reader, head);
+
+                List<DiffEntry> diffs = git.diff().setNewTree(newTreeIter).setOldTree(oldTreeIter).call();
+
+                for (DiffEntry entry : diffs) {
+                    Log.e(TAG, "Entry: " + entry);
+                }
+            }
+
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
 }

app/src/main/java/com/orgzly/android/repos/TwoWaySyncRepo.kt

@@ -7,4 +7,5 @@ import java.io.IOException
 interface TwoWaySyncRepo {
     @Throws(IOException::class)
     fun syncBook(uri: Uri, current: VersionedRook, fromDB: File): TwoWaySyncResult
+//    fun getDiff(uri: Uri, current: VersionedRook, fromDB: File): TwoWaySyncResult
 }

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

@@ -36,6 +36,7 @@ import com.orgzly.android.usecase.BookDelete
 import com.orgzly.android.util.LogUtils
 import com.orgzly.android.util.MiscUtils
 import com.orgzly.databinding.DialogBookDeleteBinding
+import com.orgzly.databinding.DialogBookDiffBinding
 import com.orgzly.databinding.DialogBookRenameBinding
 import com.orgzly.databinding.FragmentBooksBinding
 import javax.inject.Inject
@@ -197,6 +198,10 @@ class BooksFragment : Fragment(), Fab, DrawerItem, OnViewHolderClickListener<Boo
                         viewModel.deleteBookRequest(bookId)
                     }
 
+                    R.id.books_context_menu_show_diff -> {
+                        viewModel.diffBookRequest(bookId)
+                    }
+
                     else -> {
                     }
                 }
@@ -282,6 +287,28 @@ class BooksFragment : Fragment(), Fab, DrawerItem, OnViewHolderClickListener<Boo
         dialog = builder.show()
     }
 
+    private fun showBookDiffDialog(book: BookView) {
+        val dialogBinding = DialogBookDiffBinding.inflate(LayoutInflater.from(context))
+
+        dialogBinding.book.setText("Local book")
+        dialogBinding.rook.setText("Remote book")
+
+
+        val dialogBuilder = AlertDialog.Builder(context)
+                .setTitle(getString(R.string.rename_book, MiscUtils.quotedString(book.book.name)))
+                .setView(dialogBinding.root)
+
+        val d = dialogBuilder.create()
+
+        d.setOnDismissListener { ActivityUtils.closeSoftKeyboard(activity) }
+
+        d.show()
+
+        d.getButton(AlertDialog.BUTTON_POSITIVE).isEnabled = false
+
+        dialog = d
+    }
+
     private fun renameBookDialog(book: BookView) {
         val dialogBinding = DialogBookRenameBinding.inflate(LayoutInflater.from(context))
 
@@ -383,6 +410,13 @@ class BooksFragment : Fragment(), Fab, DrawerItem, OnViewHolderClickListener<Boo
             }
         })
 
+        viewModel.bookDiffRequestEvent.observeSingle(viewLifecycleOwner, Observer { bookView ->
+            if (bookView != null) {
+                showBookDiffDialog(bookView)
+            }
+        })
+
+
         viewModel.bookExportRequestEvent.observeSingle(viewLifecycleOwner, Observer { (book, format) ->
             listener?.onBookExportRequest(book, format)
         })

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

@@ -26,6 +26,8 @@ class BooksViewModel(private val dataRepository: DataRepository) : CommonViewMod
 
     val bookRenameRequestEvent: SingleLiveEvent<BookView> = SingleLiveEvent()
 
+    val bookDiffRequestEvent: SingleLiveEvent<BookView> = SingleLiveEvent()
+
     val bookExportRequestEvent: SingleLiveEvent<Pair<Book, BookFormat>> = SingleLiveEvent()
 
     enum class ViewState {
@@ -77,6 +79,12 @@ class BooksViewModel(private val dataRepository: DataRepository) : CommonViewMod
         }
     }
 
+    fun diffBookRequest(bookId: Long) {
+        App.EXECUTORS.diskIO().execute {
+            bookDiffRequestEvent.postValue(dataRepository.getBookView(bookId))
+        }
+    }
+
     fun renameBook(book: BookView, name: String) {
         App.EXECUTORS.diskIO().execute {
             catchAndPostError {

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

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<layout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:padding="@dimen/screen_edge"
+        android:orientation="horizontal">
+
+        <TextView
+            android:id="@+id/book"
+            android:layout_width="wrap_content"
+            android:layout_height="100dp"
+            app:autoSizeTextType="uniform" />
+
+        <TextView
+            android:id="@+id/rook"
+            android:layout_width="wrap_content"
+            android:layout_height="100dp"
+            app:autoSizeTextType="uniform" />
+
+    </LinearLayout>
+
+</layout>

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

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

app/src/main/res/values/strings.xml

@@ -22,6 +22,7 @@
     <string name="edit">Edit</string>
     <string name="edit_note">Edit note</string>
     <string name="delete">Delete</string>
+    <string name="show_diff">Show Diff</string>
     <string name="delete_with_quoted_argument">Delete “%s”</string>
     <string name="name">Name</string>
     <string name="value">Value</string>