Bug 534669. Added Preference Page for LSP4E-CPP

Change-Id: I8ad9be37643c6de4591db9161fbe60589ff92f07
Signed-off-by: manish <mkmanishkhurana98@gmail.com>

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/META-INF/MANIFEST.MF

@@ -19,3 +19,5 @@ Require-Bundle: org.apache.commons.io,
  org.eclipse.core.resources
 Bundle-Vendor: %Bundle-Vendor
 Export-Package: org.eclipse.lsp4e.cpp.language
+Bundle-Activator: org.eclipse.lsp4e.cpp.language.Activator
+Bundle-ActivationPolicy: lazy

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/OSGI-INF/l10n/bundle.properties

@@ -5,4 +5,5 @@ content-type.name = C/C++
 server.label = C/C++ Language Server
 
 reindex.command.name = Reindex
-reindex.command.label = Reindex
+reindex.command.label = Reindex
+PreferencePageTitle=C/C++ Language Server

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/plugin.xml

@@ -93,4 +93,19 @@
             type="java.lang.Object">
       </propertyTester>
    </extension>
+   <extension
+         point="org.eclipse.ui.preferencePages">
+      <page
+            class="org.eclipse.lsp4e.cpp.language.CPPLanguageServerPreferencePage"
+            category="org.eclipse.cdt.ui.preferences.CPluginPreferencePage"
+            id="org.eclipse.lsp4e.cpp.language.CPPLanguageServerPreferencePage"
+            name="%PreferencePageTitle">
+      </page>
+   </extension>
+   <extension
+         point="org.eclipse.core.runtime.preferences">
+      <initializer
+            class="org.eclipse.lsp4e.cpp.language.PreferenceInitializer">
+      </initializer>
+   </extension>
 </plugin>

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/Activator.java

@@ -0,0 +1,38 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import org.eclipse.ui.plugin.AbstractUIPlugin;
+import org.osgi.framework.BundleContext;
+
+public class Activator extends AbstractUIPlugin {
+
+	public Activator() {
+	}
+
+	public static final String PLUGIN_ID = "org.eclipse.lsp4e.cpp.language"; //$NON-NLS-1$
+
+	private static Activator plugin;
+
+	@Override
+	public void start(BundleContext context) throws Exception {
+		super.start(context);
+		plugin = this;
+	}
+
+	@Override
+	public void stop(BundleContext context) throws Exception {
+		plugin = null;
+		super.stop(context);
+	}
+
+	public static Activator getDefault() {
+		return plugin;
+	}
+}

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/CPPLanguageServer.java

@@ -22,23 +22,32 @@ import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResourceChangeListener;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.Platform;
+import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.lsp4e.server.ProcessStreamConnectionProvider;
 
 public class CPPLanguageServer extends ProcessStreamConnectionProvider {
 
 	public static final String ID = "org.eclipse.lsp4e.languages.cpp"; //$NON-NLS-1$
 
-	private static final String CLANG_LANGUAGE_SERVER = "clangd"; //$NON-NLS-1$
-
 	private IResourceChangeListener fResourceListener;
 
+	private static final IPreferenceStore store = Activator.getDefault().getPreferenceStore();
+
 	public CPPLanguageServer() {
 		List<String> commands = new ArrayList<>();
-		File clangServerLocation = getClangServerLocation();
+		File defaultLSLocation = getDefaultLSLocation(store.getString(PreferenceConstants.P_SERVER_CHOICE));
+		if(defaultLSLocation != null) {
+			store.setDefault(PreferenceConstants.P_SERVER_PATH, defaultLSLocation.getAbsolutePath());
+		}
+		File languageServerLocation = getLanguageServerLocation();
 		String parent = ""; //$NON-NLS-1$
-		if (clangServerLocation != null) {
+		String flags = store.getString(PreferenceConstants.P_SERVER_OPTIONS);
-			commands.add(clangServerLocation.getAbsolutePath());
+		if (languageServerLocation != null) {
-			parent = clangServerLocation.getParent();
+			commands.add(languageServerLocation.getAbsolutePath());
+			if (!flags.isEmpty()) {
+				commands.add(flags);
+			}
+			parent = languageServerLocation.getParent();
 		}
 		setWorkingDirectory(parent);
 		setCommands(commands);
@@ -86,11 +95,25 @@ public class CPPLanguageServer extends ProcessStreamConnectionProvider {
 		return "C/C++ Language Server: " + super.toString(); //$NON-NLS-1$
 	}
 
-	private static File getClangServerLocation() {
+	private static File getLanguageServerLocation() {
+		String path = store.getString(PreferenceConstants.P_SERVER_PATH);
+
+		if (path.isEmpty()) {
+			return null;
+		}
+		File f = new File(path);
+		if (f.canExecute()) {
+			return f;
+		}
+
+		return null;
+	}
+
+	private static File getDefaultLSLocation(String selectedLanguageServer) {
 		String res = null;
-		String[] command = new String[] {"/bin/bash", "-c", "which " + CLANG_LANGUAGE_SERVER}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+		String[] command = new String[] {"/bin/bash", "-c", "which " + selectedLanguageServer}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 		if (Platform.getOS().equals(Platform.OS_WIN32)) {
-			command = new String[] {"cmd", "/c", "where " + CLANG_LANGUAGE_SERVER}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+			command = new String[] {"cmd", "/c", "where " + selectedLanguageServer}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 		}
 		BufferedReader reader = null;
 		try {
@@ -115,3 +138,4 @@ public class CPPLanguageServer extends ProcessStreamConnectionProvider {
 		return null;
 	}
 }
+

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/CPPLanguageServerPreferencePage.java

@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import org.eclipse.jface.preference.*;
+import org.eclipse.ui.IWorkbenchPreferencePage;
+import org.eclipse.ui.IWorkbench;
+
+/**
+ * This class represents the preference page for C/C++ Language Server.
+ */
+
+public class CPPLanguageServerPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {
+
+	private FileFieldEditor serverPath;
+	private RadioGroupFieldEditor serverChoice;
+	private StringFieldEditor serverOptions;
+
+	public CPPLanguageServerPreferencePage() {
+		super(GRID);
+		setPreferenceStore(Activator.getDefault().getPreferenceStore());
+		setDescription(Messages.PreferencePageDescription);
+	}
+
+	@Override
+	public void createFieldEditors() {
+
+		serverChoice = new RadioGroupFieldEditor(PreferenceConstants.P_SERVER_CHOICE,
+				Messages.ServerChoiceLabel, 1,
+				new String[][] { { "ClangD", "clangd" }, { "CQuery", "cquery" } }, getFieldEditorParent()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
+		addField(serverChoice);
+
+		serverPath = new FileFieldEditor(PreferenceConstants.P_SERVER_PATH, Messages.ServerPathLabel,
+				getFieldEditorParent());
+		addField(serverPath);
+
+		serverOptions = new StringFieldEditor(PreferenceConstants.P_SERVER_OPTIONS, Messages.ServerOptionsLabel,
+				getFieldEditorParent());
+		addField(serverOptions);
+	}
+
+	@Override
+	public void init(IWorkbench workbench) {
+	}
+}

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/Messages.java

@@ -0,0 +1,22 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import org.eclipse.osgi.util.NLS;
+
+public class Messages extends NLS {
+	public static String PreferencePageDescription;
+	public static String ServerChoiceLabel;
+	public static String ServerPathLabel;
+	public static String ServerOptionsLabel;
+
+	static {
+		NLS.initializeMessages(Messages.class.getName(), Messages.class);
+	}
+}

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/Messages.properties

@@ -0,0 +1,12 @@
+################################################################################
+# Copyright (c) 2018 Manish Khurana , Nathan Ridge and others.
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+#################################################################################
+
+PreferencePageDescription=Preferences for the C/C++ Language Server\n\n
+ServerChoiceLabel=Please select the C/C++ Language Server you want to use in Eclipse :
+ServerPathLabel=Browse path to the server executable
+ServerOptionsLabel=Enter any command-line options for the server

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/PreferenceConstants.java

@@ -0,0 +1,22 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+/**
+ * Constant definitions for LSP4E-CPP plug-in preferences.
+ */
+public class PreferenceConstants {
+
+	public static final String P_SERVER_PATH = "org.eclipse.cdt.lsp.serverPathPreference"; //$NON-NLS-1$
+
+	public static final String P_SERVER_CHOICE = "org.eclipse.cdt.lsp.serverChoicePreference"; //$NON-NLS-1$
+
+	public static final String P_SERVER_OPTIONS = "org.eclipse.cdt.lsp.serverOptionsPreference"; //$NON-NLS-1$
+
+}

lsp4e-cpp/org.eclipse.lsp4e.cpp.language/src/org/eclipse/lsp4e/cpp/language/PreferenceInitializer.java

@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Manish Khurana , Nathan Ridge and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *******************************************************************************/
+
+package org.eclipse.lsp4e.cpp.language;
+
+import org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer;
+import org.eclipse.jface.preference.IPreferenceStore;
+
+/**
+ * Class used to initialize default preference values for C/C++ Preference Page.
+ */
+public class PreferenceInitializer extends AbstractPreferenceInitializer {
+
+	/*
+	 * (non-Javadoc)
+	 *
+	 * @see org.eclipse.core.runtime.preferences.AbstractPreferenceInitializer#
+	 * initializeDefaultPreferences()
+	 */
+	@Override
+	public void initializeDefaultPreferences() {
+		IPreferenceStore store = Activator.getDefault().getPreferenceStore();
+		store.setDefault(PreferenceConstants.P_SERVER_CHOICE, "clangd"); //$NON-NLS-1$
+		store.setDefault(PreferenceConstants.P_SERVER_OPTIONS, ""); //$NON-NLS-1$
+	}
+
+}