org.codequarks.uglifyjsplugin.UglifyJs2Mojo.java Source code

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Here is the source code for org.codequarks.uglifyjsplugin.UglifyJs2Mojo.java

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package org.codequarks.uglifyjsplugin;

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * 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.
 */

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;

/**
 * Goal which touches a timestamp file.
 * 
 * @goal uglify
 * 
 * @phase prepare-package
 */
public class UglifyJs2Mojo extends AbstractMojo {

    /**
     * Source directory of the JavaScript files
     * 
     * @parameter expression="${basedir}/src/main/webapp/js"
     * @required
     */
    private File jsSourceDir;

    /**
     * Output directory for the minified JavaScript files.
     * 
     * @parameter expression="${project.build.directory}/webapp-build"
     * @required
     */
    private File jsOutputDir;

    /**
     * Files/folders to exclude from minification
     * 
     * @parameter expression="${jsExcludes}" alias="resources"
     */
    private ArrayList<String> jsExcludes;

    public void execute() throws MojoExecutionException {
        JsFileFilter jsFileFilter = new JsFileFilter(jsExcludes);
        Collection<File> jsFiles = FileUtils.listFiles(jsSourceDir, jsFileFilter, TrueFileFilter.INSTANCE);
        for (File file : jsFiles) {
            try {
                Process proc = runUglifyJs2Process(file);
                if (proc.waitFor() != 0) {
                    warnOfUglifyJs2Error(proc.getErrorStream(), file.getName());
                }
            } catch (IOException e) {
                throw new MojoExecutionException("Failed to execute uglifyjs process", e);
            } catch (InterruptedException e) {
                throw new MojoExecutionException("UglifyJs process interrupted", e);
            }
        }
    }

    private Process runUglifyJs2Process(File inputFile) throws IOException, InterruptedException {
        Runtime rt = Runtime.getRuntime();
        String command = "uglifyjs " + inputFile.getPath() + " -o " + this.getOutputFile(inputFile).getPath();
        getLog().info("Minifying " + inputFile.getName() + "...");
        getLog().debug("Minifying from " + inputFile.getPath() + " to " + this.getOutputFile(inputFile).getPath());
        return rt.exec(command);
    }

    private void warnOfUglifyJs2Error(InputStream errorStream, String fileName) throws IOException {
        String error = IOUtils.toString(errorStream, "UTF-8");
        getLog().warn("Error while minifying " + fileName + ":" + error);
        getLog().warn(fileName + " was not minified. Continuing...");
    }

    private final File getOutputFile(File inputFile) throws IOException {
        String relativePath = jsSourceDir.toURI().relativize(inputFile.getParentFile().toURI()).getPath();
        File outputBaseDir = new File(jsOutputDir, relativePath);
        if (!outputBaseDir.exists())
            FileUtils.forceMkdir(outputBaseDir);
        return new File(outputBaseDir, inputFile.getName());
    }
}