it.anyplace.web.CssProcessorMojo Maven / Gradle / Ivy

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A web resource compiler/preprocessor, Maven Plugin
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/**
 * Copyright 2013 Davide Imbriaco
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see .
 *
 */
package it.anyplace.web;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import javax.annotation.Nullable;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.NotFileFilter;
import org.apache.commons.io.filefilter.RegexFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.lesscss.LessCompiler;
import org.lesscss.LessException;

/**
 *
 * @author aleph
 */
@Mojo(name = "css", defaultPhase = LifecyclePhase.PACKAGE)
public class CssProcessorMojo extends AbstractMojo {

    private final Log logger = getLog();

    @Parameter(required = true, property = "sourceCssDirectory", defaultValue = "${project.basedir}/src/main/css")
    private File sourceCssDirectory;

    @Parameter(required = true, property = "targetCssDirectory", defaultValue = "${project.build.directory}/${project.build.finalName}/css")
    private File targetCssDirectory;

    @Parameter(property = "defaultPrefix", defaultValue = "")
    private String defaultPrefix;

    @Parameter(property = "compressCss", defaultValue = "false")
    private boolean compressCss;

    @Parameter(property = "excludedCssRegexp", defaultValue = "^.*[0-9]+.*less$")
    private String excludedCssRegexp;

    private LessCompiler lessCompiler;

    private final BuildCache cache = new BuildCache();

    public void execute() throws MojoExecutionException, MojoFailureException {
        logger.info("executing a-web css processor");
        try {
            if (sourceCssDirectory.exists()) {
                targetCssDirectory.mkdirs();
                for (File file : sourceCssDirectory.listFiles(new FileFilter() {

                    public boolean accept(File file) {
                        return file.isFile();
                    }
                })) {
                    if (!file.getName().matches(excludedCssRegexp)) {
                        processCssFile(file);
                    }
                }
                for (File directory : sourceCssDirectory.listFiles(new FileFilter() {

                    public boolean accept(File file) {
                        return file.isDirectory();
                    }
                })) {
                    String prefix = defaultPrefix + "-" + directory.getName();
                    processCssFiles(prefix, FileUtils.listFiles(directory, cssFileFilter, TrueFileFilter.INSTANCE));
                }

            }
        } catch (Exception ex) {
            throw new MojoExecutionException("error processing css", ex);
        }
    }

    private LessCompiler getLessCompiler() {
        if (lessCompiler == null) {
//            LessOptions lessOptions = new LessOptions();
//            lessEngine = new LessEngine(lessOptions, new FilesystemResourceLoader());
            lessCompiler = new LessCompiler();
            lessCompiler.setCompress(compressCss);
        }
        return lessCompiler;
    }

    private final IOFileFilter cssFileFilter = new RegexFileFilter("^.*[.](css|less)$");

    private void processCssFile(File inputFile) throws LessException, IOException {
        String data = processCssFileToString(inputFile);
        if (data != null) {
            File outputFile = new File(targetCssDirectory, inputFile.getName().replaceFirst("[.][^.]+$", ".css"));
            FileUtils.write(outputFile, data);
        }
    }

    private @Nullable
    String processCssFileToString(File inputFile) throws LessException, IOException {
        String data;
        final String cacheKey = "lessCompilation" + compressCss;
        if (inputFile.getName().endsWith(".less")) {
//            data = getLessCompiler().compile(inputFile, compressCss);
            logger.debug("processing less file = " + inputFile);
            File result = cache.getResult(inputFile, cacheKey);
//            data = FileUtils.readFileToString(inputFile);
//            String fromCache = cache.getResult(data);
            if (result != null) {
                data = FileUtils.readFileToString(result);
            } else {
                data = getLessCompiler().compile(inputFile);
                cache.cacheResult(inputFile, cacheKey, data.getBytes());
            }
//            data = fromCache == null ? getLessCompiler().compile(inputFile) : fromCache;
        } else if (inputFile.getName().endsWith(".css")) {
            logger.debug("processing css file = " + inputFile);
            data = FileUtils.readFileToString(inputFile);
        } else {
            data = null;
        }
        return data;
    }

    private void processCssFiles(String prefix, Iterable inputFiles) throws LessException, IOException {
        File targetFile = new File(targetCssDirectory, prefix + ".css");
        logger.debug("processing css files to = " + targetFile);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        for (File inputFile : inputFiles) {

            String data = processCssFileToString(inputFile);

            for (File resourceFile : FileUtils.listFiles(inputFile.getParentFile(), new NotFileFilter(cssFileFilter), TrueFileFilter.INSTANCE)) {
//            String resourceName=resourceFile.getName();
                String cssPath = inputFile.getParentFile().getCanonicalPath(),
                        resourcePath = resourceFile.getParentFile().getCanonicalPath(),
                        relativePath = resourcePath.substring(cssPath.length());
                logger.debug("css path = " + cssPath + " , resource path = " + resourcePath + " , relative path = " + relativePath);
//                String relativePath = resourceFile.getParentFile().getAbsoluteFile().toURI().relativize(inputFile.getParentFile().getAbsoluteFile().toURI()).getPath();
//                File resourceDir = relativePath.isEmpty() ? targetCssDirectory : new File(targetCssDirectory, relativePath);
                String newResourceDirName = inputFile.getParentFile().getName(), newResourceUrl = newResourceDirName;
                File resourceDir = new File(targetCssDirectory, newResourceDirName);
                if (!relativePath.isEmpty()) {
                    resourceDir = new File(resourceDir, relativePath);
                    newResourceUrl = newResourceUrl + "/" + relativePath;
                }
                newResourceUrl = newResourceUrl + "/" + resourceFile.getName();
                data = data.replaceAll("[a-zA-Z0-9._/-]*" + resourceFile.getName(), newResourceUrl);
//                resourceDir.mkdirs();
                logger.debug("copying css resource = " + resourceFile + " to dir = " + resourceDir);
                FileUtils.copyFileToDirectory(resourceFile, resourceDir);
            }

            IOUtils.write("\n\n/** BEGIN FILE " + inputFile.getName() + " **/\n\n", out);
            IOUtils.write(data, out);
            IOUtils.write("\n\n/** END FILE " + inputFile.getName() + " **/\n\n", out);
        }
        // TODO css compression
        FileUtils.writeByteArrayToFile(targetFile, out.toByteArray());
    }
}