Properly use selected string for replacements in FindReplaceDialog #1754

When opening the FindReplaceDialog with an active selection in a text
viewer, the input field for the find string is filled with the content
of that selection. In addition, the replace functionality of the dialog
is activated. Currently, using the replace functionality does not work
because it requires a find operation to be executed before, which is
currently not done.

With this change, initializing the dialog with the current selection
performs the missing find operation before executing a replace
operation. The according functionality is refactored and a regression
test is added.

Fixes #1754

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/texteditor/FindReplaceDialog.java

@@ -259,7 +259,7 @@ public void create() {
 		updateCombo(fReplaceField, replaceHistory.get());
 
 		// get find string
-		initFindStringFromSelection();
+		initFindString();
 
 		// set dialog position
 		if (fDialogPositionInit != null)
@@ -898,35 +898,61 @@ private void storeSettings() {
 		writeConfiguration();
 	}
 
+	/**
+	 * Initializes the string to search for and the according text in the find field
+	 * based on either the selection in the target or, if nothing is selected, with
+	 * the newest search history entry.
+	 */
+	private void initFindString() {
+		if (!okToUse(fFindField)) {
+			return;
+		}
+
+		fFindField.removeModifyListener(fFindModifyListener);
+		if (hasTargetSelection()) {
+			initFindStringFromSelection();
+		} else {
+			initFindStringFromHistory();
+		}
+		fFindField.setSelection(new Point(0, fFindField.getText().length()));
+		fFindField.addModifyListener(fFindModifyListener);
+	}
+
+	private boolean hasTargetSelection() {
+		String selection = getCurrentSelection();
+		return selection != null && !selection.isEmpty();
+	}
+
 	/**
 	 * Initializes the string to search for and the appropriate text in the Find
 	 * field based on the selection found in the action's target.
 	 */
 	private void initFindStringFromSelection() {
-		String fullSelection = getCurrentSelection();
-		if (fullSelection != null && okToUse(fFindField)) {
-			boolean isRegEx = findReplaceLogic.isRegExSearchAvailableAndActive();
-			fFindField.removeModifyListener(fFindModifyListener);
-			if (!fullSelection.isEmpty()) {
-				String firstLine = getFirstLine(fullSelection);
-				String pattern = isRegEx ? FindReplaceDocumentAdapter.escapeForRegExPattern(fullSelection) : firstLine;
-				fFindField.setText(pattern);
-				if (!firstLine.equals(fullSelection)) {
-					// multiple lines selected
-					findReplaceLogic.deactivate(SearchOptions.GLOBAL);
-					fGlobalRadioButton.setSelection(false);
-					fSelectedRangeRadioButton.setSelection(true);
-				}
+		String selection = getCurrentSelection();
+		String searchInput = getFirstLine(selection);
+		boolean isSingleLineInput = searchInput.equals(selection);
+		if (findReplaceLogic.isRegExSearchAvailableAndActive()) {
+			searchInput = FindReplaceDocumentAdapter.escapeForRegExPattern(selection);
+		}
+		fFindField.setText(searchInput);
+
+		if (isSingleLineInput) {
+			// initialize search with current selection to allow for execution of replace
+			// operations
+			findReplaceLogic.findAndSelect(findReplaceLogic.getTarget().getSelection().x, fFindField.getText());
+		} else {
+			fGlobalRadioButton.setSelection(false);
+			fSelectedRangeRadioButton.setSelection(true);
+		}
+	}
+
+	private void initFindStringFromHistory() {
+		if ("".equals(fFindField.getText())) { //$NON-NLS-1$
+			if (!findHistory.isEmpty()) {
+				fFindField.setText(findHistory.get(0));
 			} else {
-				if ("".equals(fFindField.getText())) { //$NON-NLS-1$
-					if (!findHistory.isEmpty())
-						fFindField.setText(findHistory.get(0));
-					else
-						fFindField.setText(""); //$NON-NLS-1$
-				}
+				fFindField.setText(""); //$NON-NLS-1$
 			}
-			fFindField.setSelection(new Point(0, fFindField.getText().length()));
-			fFindField.addModifyListener(fFindModifyListener);
 		}
 	}
 
@@ -1164,7 +1190,7 @@ public void updateTarget(IFindReplaceTarget target, boolean isTargetEditable, bo
 			fReplaceField.setEnabled(targetExists && findReplaceLogic.getTarget().isEditable());
 			fReplaceAllButton.setEnabled(targetExists && findReplaceLogic.getTarget().isEditable());
 			if (initializeFindString) {
-				initFindStringFromSelection();
+				initFindString();
 				fGiveFocusToFindField = true;
 			}
 		}

tests/org.eclipse.ui.workbench.texteditor.tests/src/org/eclipse/ui/workbench/texteditor/tests/FindReplaceDialogTest.java

@@ -92,6 +92,8 @@ private class DialogAccess {
 
 		Button regExCheckBox;
 
+		Button replaceFindButton;
+
 		private Supplier<Shell> shellRetriever;
 
 		private Runnable closeOperation;
@@ -106,6 +108,7 @@ private class DialogAccess {
 			wholeWordCheckBox= (Button) findReplaceDialogAccessor.get("fWholeWordCheckBox");
 			incrementalCheckBox= (Button) findReplaceDialogAccessor.get("fIncrementalCheckBox");
 			regExCheckBox= (Button) findReplaceDialogAccessor.get("fIsRegExCheckBox");
+			replaceFindButton= (Button) findReplaceDialogAccessor.get("fReplaceFindButton");
 			shellRetriever= () -> ((Shell) findReplaceDialogAccessor.get("fActiveShell"));
 			closeOperation= () -> findReplaceDialogAccessor.invoke("close", null);
 			assertInitialConfiguration();
@@ -176,10 +179,17 @@ private void openTextViewerAndFindReplaceDialog() {
 	}
 
 	private void openTextViewerAndFindReplaceDialog(String content) {
+		openTextViewer(content);
+		openFindReplaceDialogForTextViewer();
+	}
+
+	private void openTextViewer(String content) {
 		fTextViewer= new TextViewer(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
 		fTextViewer.setDocument(new Document(content));
 		fTextViewer.getControl().setFocus();
+	}
 
+	private void openFindReplaceDialogForTextViewer() {
 		Accessor fFindReplaceAction;
 		fFindReplaceAction= new Accessor("org.eclipse.ui.texteditor.FindReplaceAction", getClass().getClassLoader(),
 				new Class[] { ResourceBundle.class, String.class, Shell.class, IFindReplaceTarget.class },
@@ -366,6 +376,22 @@ public void testFindWithWholeWordEnabledWithMultipleWords() {
 		assertEquals(dialog.findCombo.getText().length(), (target.getSelection()).y);
 	}
 
+	@Test
+	public void testReplaceAndFindAfterInitializingFindWithSelectedString() {
+		openTextViewer("text text text");
+		fTextViewer.setSelectedRange(0, 4);
+		openFindReplaceDialogForTextViewer();
+
+		IFindReplaceTarget target= dialog.findReplaceLogic.getTarget();
+		assertEquals(0, (target.getSelection()).x);
+		assertEquals(4, (target.getSelection()).y);
+		select(dialog.replaceFindButton);
+
+		assertEquals(" text text", fTextViewer.getDocument().get());
+		assertEquals(1, (target.getSelection()).x);
+		assertEquals(4, (target.getSelection()).y);
+	}
+
 	private static void select(Button button) {
 		button.setSelection(true);
 		button.notifyListeners(SWT.Selection, null);