org.eclipse.lsp4e.cpp.language.CPPLanguageServer.java Source code

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Here is the source code for org.eclipse.lsp4e.cpp.language.CPPLanguageServer.java

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/*******************************************************************************
 * Copyright (c) 2017 Ericsson 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 java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.IOUtils;
import org.eclipse.core.resources.IContainer;
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.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;

    public CPPLanguageServer() {
        List<String> commands = new ArrayList<>();
        File clangServerLocation = getClangServerLocation();
        String parent = ""; //$NON-NLS-1$
        if (clangServerLocation != null) {
            commands.add(clangServerLocation.getAbsolutePath());
            parent = clangServerLocation.getParent();
        }
        setWorkingDirectory(parent);
        setCommands(commands);
    }

    @Override
    public void stop() {
        super.stop();
        if (fResourceListener != null) {
            ResourcesPlugin.getWorkspace().removeResourceChangeListener(fResourceListener);
            fResourceListener = null;
        }
    }

    @Override
    public Object getInitializationOptions(URI rootPath) {
        installResourceChangeListener(rootPath);
        return super.getInitializationOptions(rootPath);
    }

    private void installResourceChangeListener(URI rootPath) {
        if (rootPath == null || fResourceListener != null) {
            return;
        }

        IContainer[] containers = ResourcesPlugin.getWorkspace().getRoot().findContainersForLocationURI(rootPath);
        if (containers.length == 0) {
            return;
        }

        for (IContainer c : containers) {
            if (!(c instanceof IProject)) {
                continue;
            }
            IProject project = (IProject) c;
            fResourceListener = new CPPResourceChangeListener(project);
            project.getWorkspace().addResourceChangeListener(fResourceListener);

            break;
        }
    }

    @Override
    public String toString() {
        return "C/C++ Language Server: " + super.toString(); //$NON-NLS-1$
    }

    private static File getClangServerLocation() {
        String res = null;
        String[] command = new String[] { "/bin/bash", "-c", "which " + CLANG_LANGUAGE_SERVER }; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
        if (Platform.getOS().equals(Platform.OS_WIN32)) {
            command = new String[] { "cmd", "/c", "where " + CLANG_LANGUAGE_SERVER }; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
        }
        BufferedReader reader = null;
        try {
            Process p = Runtime.getRuntime().exec(command);
            reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
            res = reader.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(reader);
        }

        if (res == null) {
            return null;
        }

        File f = new File(res);
        if (f.canExecute()) {
            return f;
        }

        return null;
    }
}