org.intellij.erlang.rebar.settings.RebarConfigurable.java Source code

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Here is the source code for org.intellij.erlang.rebar.settings.RebarConfigurable.java

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/*
 * Copyright 2012 Sergey Ignatov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.intellij.erlang.rebar.settings;

import com.intellij.openapi.fileChooser.FileChooserDescriptorFactory;
import com.intellij.openapi.options.Configurable;
import com.intellij.openapi.options.ConfigurationException;
import com.intellij.openapi.options.SearchableConfigurable;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.TextFieldWithBrowseButton;
import com.intellij.openapi.vfs.VirtualFile;
import org.apache.commons.lang.StringUtils;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.concurrent.*;

final class RebarConfigurable implements SearchableConfigurable, Configurable.NoScroll {
    private JPanel myPanel;
    private TextFieldWithBrowseButton myRebarPathSelector;
    private JTextField myRebarVersionText;

    private String myPrevRebarPath;
    private RebarSettings myRebarSettings;

    public RebarConfigurable(@NotNull Project project) {
        myRebarSettings = RebarSettings.getInstance(project);
        myRebarPathSelector.addBrowseFolderListener("Select rebar executable", "", null,
                FileChooserDescriptorFactory.createSingleLocalFileDescriptor());
        myPrevRebarPath = myRebarSettings.getRebarPath();

        if (StringUtils.isEmpty(myRebarSettings.getRebarPath())) {
            VirtualFile baseDir = project.getBaseDir();
            VirtualFile rebar = baseDir.findChild("rebar");
            if (rebar != null) {
                String canonicalPath = rebar.getCanonicalPath();
                if (canonicalPath != null) {
                    myRebarSettings.setRebarPath(canonicalPath);
                }
            }
        }

        myRebarPathSelector.setText(myRebarSettings.getRebarPath());
        validateRebarPath();
    }

    @NotNull
    @Override
    public String getId() {
        return "Rebar";
    }

    @Nullable
    @Override
    public Runnable enableSearch(String option) {
        return null;
    }

    @NonNls
    @Override
    public String getDisplayName() {
        return "Rebar";
    }

    @Nullable
    @Override
    public String getHelpTopic() {
        return null;
    }

    @Nullable
    @Override
    public JComponent createComponent() {
        return myPanel;
    }

    @Override
    public boolean isModified() {
        final String selectedPath = myRebarPathSelector.getText();
        if (!myPrevRebarPath.equals(selectedPath)) {
            validateRebarPath();
        }
        return !myRebarSettings.getRebarPath().equals(selectedPath);
    }

    @Override
    public void apply() throws ConfigurationException {
        myRebarSettings.setRebarPath(myRebarPathSelector.getText());
    }

    @Override
    public void reset() {
        myRebarPathSelector.setText(myRebarSettings.getRebarPath());
        validateRebarPath();
    }

    @Override
    public void disposeUIResources() {
    }

    private void validateRebarPath() {
        final String version = restrictedTimeExec(myRebarPathSelector.getText() + " --version", 3000);
        if (version.startsWith("rebar")) {
            myRebarVersionText.setText(version);
        } else {
            myRebarVersionText.setText("N/A");
        }
    }

    @NotNull
    private static String restrictedTimeExec(@NotNull String cmd, int timeout) {
        try {
            final Process cmdRunner = Runtime.getRuntime().exec(cmd);
            final ExecutorService singleTreadExecutor = Executors.newSingleThreadExecutor();
            final Future<String> cmdRunnerFuture = singleTreadExecutor.submit(new Callable<String>() {
                @Override
                public String call() throws Exception {
                    cmdRunner.waitFor();
                    final BufferedReader outReader = new BufferedReader(
                            new InputStreamReader(cmdRunner.getInputStream()));
                    try {
                        final String firstLine = outReader.readLine();
                        return firstLine == null ? "" : firstLine;
                    } finally {
                        outReader.close();
                    }
                }
            });
            try {
                return cmdRunnerFuture.get(timeout, TimeUnit.MILLISECONDS);
            } catch (Exception e) { // Suppress
            }
            cmdRunnerFuture.cancel(true);
            singleTreadExecutor.shutdown();
        } catch (IOException e) { // Suppress
        }
        return "";
    }
}