add preference page to format on save (only full file)

org.eclipse.corrosion/META-INF/MANIFEST.MF

@@ -53,3 +53,4 @@ Export-Package: org.eclipse.corrosion;x-friends:="org.eclipse.corrosion.tests",
  org.eclipse.corrosion.wizards.export;x-friends:="org.eclipse.corrosion.tests",
  org.eclipse.corrosion.wizards.newproject;x-friends:="org.eclipse.corrosion.tests"
 Import-Package: org.eclipse.jdt.annotation
+Service-Component: OSGI-INF/org.eclipse.corrosion.edit.FormatOnSave.xml

org.eclipse.corrosion/OSGI-INF/l10n/bundle.properties

@@ -6,6 +6,7 @@ content-type.name.0 = Cargo manifest file
 toml.content-type.name = Toml file
 page.name = Rust
 page.name.0 = Text Editor
+page.name.1 = Save Actions
 category.name = Rust
 wizard.name = Cargo Project
 wizard.name.0 = Rust Crate Packager

org.eclipse.corrosion/OSGI-INF/org.eclipse.corrosion.edit.FormatOnSave.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.3.0" name="org.eclipse.corrosion.edit.FormatOnSave">
+   <property name="serverDefinitionId" type="String" value="org.eclipse.corrosion.rls"/>
+   <service>
+      <provide interface="org.eclipse.lsp4e.format.IFormatRegionsProvider"/>
+   </service>
+   <implementation class="org.eclipse.corrosion.edit.FormatOnSave"/>
+</scr:component>

org.eclipse.corrosion/plugin.xml

@@ -81,6 +81,12 @@
             id="org.eclipse.corrosion.debug"
             name="%debugPreferencePage">
       </page>
+      <page
+            category="org.eclipse.corrosion.texteditor"
+            class="org.eclipse.corrosion.edit.SaveActionsPreferencePage"
+            id="org.eclipse.corrosion.saveactions"
+            name="%page.name.1">
+      </page>
    </extension>
    <extension
        point="org.eclipse.core.expressions.definitions">

org.eclipse.corrosion/src/org/eclipse/corrosion/CorrosionPreferenceInitializer.java

@@ -43,6 +43,11 @@ public class CorrosionPreferenceInitializer extends AbstractPreferenceInitialize
 	 */
 	public static final String DEFAULT_GDB_PREFERENCE = "corrosion.defaultGdb"; //$NON-NLS-1$
 
+	// Editor format on save preferences
+	public static final String EDIT_FORMAT_ON_SAVE_PREFERENCE = "corrosion.edit.formatOnSave"; //$NON-NLS-1$
+	public static final String EDIT_FORMAT_EDITED_ON_SAVE_PREFERENCE = "corrosion.edit.formatEditedOnSave"; //$NON-NLS-1$
+	public static final String EDIT_FORMAT_ALL_ON_SAVE_PREFERENCE = "corrosion.edit.formatAllOnSave"; //$NON-NLS-1$
+
 	@Override
 	public void initializeDefaultPreferences() {
 		STORE.setDefault(RUSTUP_PATHS_PREFERENCE, getRustupPathBestGuess());
@@ -54,6 +59,10 @@ public void initializeDefaultPreferences() {
 
 		STORE.setDefault(WORKING_DIRECTORY_PREFERENCE, getWorkingDirectoryBestGuess());
 		STORE.setDefault(DEFAULT_GDB_PREFERENCE, DEFAULT_DEBUGGER);
+
+		STORE.setDefault(EDIT_FORMAT_ON_SAVE_PREFERENCE, false);
+		STORE.setDefault(EDIT_FORMAT_EDITED_ON_SAVE_PREFERENCE, false);
+		STORE.setDefault(EDIT_FORMAT_ALL_ON_SAVE_PREFERENCE, true);
 	}
 
 	private static String getRustupPathBestGuess() {

org.eclipse.corrosion/src/org/eclipse/corrosion/Messages.java

@@ -169,5 +169,10 @@ public class Messages extends NLS {
 	public static String LaunchHandler_launchingFromCargoRegistryUnsupported;
 	public static String LaunchHandler_unsupportedProjectLocation;
 	public static String LaunchHandler_unableToLaunchCommand;
-
+	public static String SaveActionsConfigurationPage_FormatSourceCode;
+	public static String SaveActionsConfigurationPage_FormatSourceCode_description;
+	public static String SaveActionsConfigurationPage_FormatAllLines;
+	public static String SaveActionsConfigurationPage_FormatAllLines_description;
+	public static String SaveActionsConfigurationPage_FormatEditedLines;
+	public static String SaveActionsConfigurationPage_FormatEditedLines_description;
 }

org.eclipse.corrosion/src/org/eclipse/corrosion/edit/FormatOnSave.java

@@ -0,0 +1,45 @@
+/*******************************************************************************
+ * Copyright (c) 2025 Contributors to the Eclipse Foundation.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *   See git history
+ *******************************************************************************/
+
+package org.eclipse.corrosion.edit;
+
+import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.corrosion.CorrosionPlugin;
+import org.eclipse.corrosion.CorrosionPreferenceInitializer;
+import org.eclipse.jface.preference.IPreferenceStore;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.lsp4e.LSPEclipseUtils;
+import org.eclipse.lsp4e.format.IFormatRegionsProvider;
+import org.osgi.service.component.annotations.Component;
+
+@Component(property = { "serverDefinitionId:String=org.eclipse.corrosion.rls" })
+public class FormatOnSave implements IFormatRegionsProvider {
+
+	@Override
+	public IRegion[] getFormattingRegions(IDocument document) {
+		IPreferenceStore store = CorrosionPlugin.getDefault().getPreferenceStore();
+		var file = LSPEclipseUtils.getFile(document);
+		if (file != null) {
+			if (store.getBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_ON_SAVE_PREFERENCE)) {
+				if (store.getBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_ALL_ON_SAVE_PREFERENCE)) {
+					return IFormatRegionsProvider.allLines(document);
+				}
+				if (store.getBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_EDITED_ON_SAVE_PREFERENCE)) {
+					return IFormatRegionsProvider.calculateEditedLineRegions(document, new NullProgressMonitor());
+				}
+			}
+		}
+		return null;
+	}
+
+}

org.eclipse.corrosion/src/org/eclipse/corrosion/edit/SaveActionsPreferencePage.java

@@ -0,0 +1,99 @@
+package org.eclipse.corrosion.edit;
+
+import org.eclipse.corrosion.CorrosionPlugin;
+import org.eclipse.corrosion.CorrosionPreferenceInitializer;
+import org.eclipse.corrosion.Messages;
+import org.eclipse.jface.layout.GridDataFactory;
+import org.eclipse.jface.layout.GridLayoutFactory;
+import org.eclipse.jface.preference.IPreferenceStore;
+import org.eclipse.jface.preference.PreferencePage;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.SelectionAdapter;
+import org.eclipse.swt.events.SelectionEvent;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.ui.IWorkbench;
+import org.eclipse.ui.IWorkbenchPreferencePage;
+
+public class SaveActionsPreferencePage extends PreferencePage implements IWorkbenchPreferencePage {
+	private IPreferenceStore store;
+
+	private Button format;
+	private Button formatAll;
+	private Button formatEdited;
+
+	@Override
+	public void init(IWorkbench workbench) {
+		store = CorrosionPlugin.getDefault().getPreferenceStore();
+	}
+
+	@Override
+	protected Control createContents(Composite parent) {
+		parent.setLayoutData(new GridData(SWT.NONE, SWT.TOP, true, false));
+
+		Composite composite = new Composite(parent, SWT.NONE);
+		composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
+		composite.setLayout(GridLayoutFactory.fillDefaults().create());
+
+		format = createButton(Messages.SaveActionsConfigurationPage_FormatSourceCode,
+				Messages.SaveActionsConfigurationPage_FormatSourceCode_description, composite, SWT.CHECK, 0);
+		formatAll = createButton(Messages.SaveActionsConfigurationPage_FormatAllLines,
+				Messages.SaveActionsConfigurationPage_FormatAllLines_description, composite, SWT.RADIO, 15);
+		formatEdited = createButton(Messages.SaveActionsConfigurationPage_FormatEditedLines,
+				Messages.SaveActionsConfigurationPage_FormatEditedLines_description, composite, SWT.RADIO, 15);
+
+		format.setSelection(store.getBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_ON_SAVE_PREFERENCE));
+		formatAll.setSelection(store.getBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_ALL_ON_SAVE_PREFERENCE));
+		formatEdited
+				.setSelection(store.getBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_EDITED_ON_SAVE_PREFERENCE));
+
+		// listener to update enable state for the radio buttons
+		format.addSelectionListener(new SelectionAdapter() {
+			@Override
+			public void widgetSelected(SelectionEvent e) {
+				updateEnabledState();
+			}
+		});
+
+		updateEnabledState();
+		return parent;
+
+	}
+
+	@Override
+	protected void performDefaults() {
+		format.setSelection(store.getDefaultBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_ON_SAVE_PREFERENCE));
+		formatAll.setSelection(
+				store.getDefaultBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_ALL_ON_SAVE_PREFERENCE));
+		formatEdited.setSelection(
+				store.getDefaultBoolean(CorrosionPreferenceInitializer.EDIT_FORMAT_EDITED_ON_SAVE_PREFERENCE));
+		updateEnabledState();
+		super.performDefaults();
+	}
+
+	@Override
+	public boolean performOk() {
+		store.setValue(CorrosionPreferenceInitializer.EDIT_FORMAT_ON_SAVE_PREFERENCE, format.getSelection());
+		store.setValue(CorrosionPreferenceInitializer.EDIT_FORMAT_ALL_ON_SAVE_PREFERENCE, formatAll.getSelection());
+		store.setValue(CorrosionPreferenceInitializer.EDIT_FORMAT_EDITED_ON_SAVE_PREFERENCE,
+				formatEdited.getSelection());
+		return true;
+	}
+
+	private static Button createButton(String name, String description, Composite composite, int style,
+			int horizontalIndent) {
+		Button button = new Button(composite, style);
+		button.setLayoutData(GridDataFactory.fillDefaults().indent(horizontalIndent, 0).create());
+		button.setText(name);
+		button.setToolTipText(description);
+		return button;
+	}
+
+	private void updateEnabledState() {
+		boolean formatOnSaveIsEnabled = format.getSelection();
+		formatAll.setEnabled(formatOnSaveIsEnabled);
+		formatEdited.setEnabled(formatOnSaveIsEnabled);
+	}
+}

org.eclipse.corrosion/src/org/eclipse/corrosion/messages.properties

@@ -158,3 +158,10 @@ LaunchHandler_unableToLaunch=Unable to Launch
 LaunchHandler_launchingFromCargoRegistryUnsupported=Launching from the central cargo registry is not supported.
 LaunchHandler_unsupportedProjectLocation=Unsupported project location. The project must be imported as an Eclipse project.
 LaunchHandler_unableToLaunchCommand=Unable to launch command: {0}.
+
+SaveActionsConfigurationPage_FormatSourceCode=Format source code
+SaveActionsConfigurationPage_FormatSourceCode_description=Formats source code when file is saved
+SaveActionsConfigurationPage_FormatAllLines=Format all lines
+SaveActionsConfigurationPage_FormatAllLines_description=Formats all source code lines
+SaveActionsConfigurationPage_FormatEditedLines=Format edited lines (currently unsupported by rust-analyzer)
+SaveActionsConfigurationPage_FormatEditedLines_description=Formats edited source code lines only