Add new command to clean the server workspace

Signed-off-by: Snjezana Peco <snjezana.peco@redhat.com>

Author: snjeza

README.md

@@ -59,6 +59,7 @@ The following commands are available:
 - `Java:Force Java compilation` (`Shift+Alt+B`): manually triggers compilation of the workspace.
 - `Java:Organize imports` (`Shift+Alt+O`): Organize imports in the currently opened Java file.
 - `Java:Open Java formatter settings`: Open the Eclipse formatter settings. Creates a new settings file if none exists.
+- `Java:Clean the Java language server workspace`: Clean the Java language server workspace.
 
 Supported VS Code settings
 ==========================
@@ -90,6 +91,9 @@ The following settings are supported:
 * `java.completion.guessMethodArguments` : When set to true, method arguments are guessed when a method is selected from as list of code assist proposals.
 * `java.completion.enabled` : Enable/disable code completion support.
 
+*New in 0.33.0:*
+* `java.clean.workspace` : Clean the Java language server workspace.
+
 
 Troubleshooting
 ===============

package.json

@@ -283,6 +283,11 @@
         "command": "java.open.formatter.settings",
         "title": "Open Java formatter settings",
         "category": "Java"
+      },
+      {
+        "command": "java.clean.workspace",
+        "title": "Clean the Java language server workspace",
+        "category": "Java"
       }
     ],
     "keybindings": [

src/commands.ts

@@ -82,4 +82,8 @@ export namespace Commands {
      * Open Java formatter settings
      */
     export const OPEN_FORMATTER = 'java.open.formatter.settings';
+    /**
+     * Clean the Java language server workspace
+     */
+    export const CLEAN_WORKSPACE = 'java.clean.workspace';
 }

src/extension.ts

@@ -15,7 +15,8 @@ import * as net from 'net';
 
 let oldConfig;
 let lastStatus;
-let languageClient : LanguageClient;
+let languageClient: LanguageClient;
+const cleanWorkspaceFileName = '.cleanWorkspace';
 
 export function activate(context: ExtensionContext): Promise<ExtensionAPI> {
 
@@ -264,13 +265,25 @@ export function activate(context: ExtensionContext): Promise<ExtensionAPI> {
 					};
 					workspace.registerTextDocumentContentProvider('jdt', provider);
 				});
+
+				let cleanWorkspaceExists = fs.existsSync( path.join(workspacePath,  cleanWorkspaceFileName));
+				if (cleanWorkspaceExists) {
+					try {
+						deleteDirectory(workspacePath);
+					} catch (error) {
+						window.showErrorMessage('Failed to delete ' + workspacePath + ': ' + error);
+					}
+				}
+
 				languageClient.start();
 				// Register commands here to make it available even when the language client fails
 				commands.registerCommand(Commands.OPEN_SERVER_LOG, () => openServerLogFile(workspacePath));
 
 				let extensionPath = context.extensionPath;
 				commands.registerCommand(Commands.OPEN_FORMATTER, async () => openFormatter(extensionPath));
 
+				commands.registerCommand(Commands.CLEAN_WORKSPACE, () => cleanWorkspace(workspacePath));
+
 				context.subscriptions.push(onConfigurationChange());
 				toggleItem(window.activeTextEditor, item);
 			});
@@ -431,6 +444,31 @@ function getJavaConfiguration(): WorkspaceConfiguration {
 	return workspace.getConfiguration('java');
 }
 
+async function cleanWorkspace(workspacePath) {
+	const doIt = 'Restart and delete';
+	window.showWarningMessage('Are you sure you want to clean the Java language server workspace?', 'Cancel', doIt).then(selection => {
+		if (selection === doIt) {
+			const file = path.join(workspacePath, cleanWorkspaceFileName);
+			fs.closeSync(fs.openSync(file, 'w'));
+			commands.executeCommand(Commands.RELOAD_WINDOW);
+		}
+	});
+}
+
+function deleteDirectory(dir) {
+	if (fs.existsSync(dir)) {
+		fs.readdirSync(dir).forEach(function (child) {
+			let entry = path.join(dir, child);
+			if (fs.lstatSync(entry).isDirectory()) {
+				deleteDirectory(entry);
+			} else {
+				fs.unlinkSync(entry);
+			}
+		});
+		fs.rmdirSync(dir);
+	}
+}
+
 function openServerLogFile(workspacePath): Thenable<boolean> {
 	let serverLogFile = path.join(workspacePath, '.metadata', '.log');
 	if (!serverLogFile) {

test/extension.test.ts

@@ -36,7 +36,8 @@ suite('Java Language Extension', () => {
 				Commands.OPEN_SERVER_LOG,
 				Commands.COMPILE_WORKSPACE,
 				Commands.EDIT_ORGANIZE_IMPORTS,
-				Commands.OPEN_FORMATTER
+				Commands.OPEN_FORMATTER,
+				Commands.CLEAN_WORKSPACE
 			];
 			let foundJavaCommands = commands.filter(function(value){
 				return JAVA_COMMANDS.indexOf(value)>=0 || value.startsWith('java.');