org.codehaus.mojo.lesscss.CompileMojo Maven / Gradle / Ivy

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The LESS CSS Maven Plugin is used to compile the LESS sources of your project to CSS stylesheets.
There is a newer version: 1.0-beta-3
package org.codehaus.mojo.lesscss;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.net.MalformedURLException;
import java.util.Arrays;

import org.apache.maven.plugin.MojoExecutionException;

import com.googlecode.lesscss4j.LessCompiler;
import com.googlecode.lesscss4j.LessException;
import com.googlecode.lesscss4j.LessSource;

/**
 * Goal which compiles the LESS sources to CSS stylesheets.
 * 
 * @author Marcel Overdijk
 * @goal compile
 * @phase process-sources
 */
public class CompileMojo
    extends AbstractLessCssMojo
{
    /**
     * The directory for compiled CSS stylesheets.
     * 
     * @parameter expression="${lesscss.outputDirectory}" default-value="${project.build.directory}"
     * @required
     */
    private File outputDirectory;

    /**
     * When true the LESS compiler will compress the CSS stylesheets. 
     * 
     * @parameter expression="${lesscss.compress}" default-value="false"
     */
    private boolean compress;
    
    /**
     * When true forces the LESS compiler to always compile the LESS sources. 
     * By default LESS sources are only compiled when modified (including imports) or the CSS stylesheet does not 
     * exists.
     * 
     * @parameter expression="${lesscss.force}" default-value="false"
     */
    private boolean force;
    
    /**
     * The location of the LESS JavasSript file.
     * 
     * @parameter
     */
    private File lessJs;

    /**
     * Execute the MOJO.
     * 
     * @throws MojoExecutionException if something unexpected occurs.
     */
    public void execute()
        throws MojoExecutionException
    {
        long start = System.currentTimeMillis();

        if ( getLog().isDebugEnabled() )
        {
            getLog().debug( "sourceDirectory = " + sourceDirectory );
            getLog().debug( "outputDirectory = " + outputDirectory );
            getLog().debug( "includes = " + Arrays.toString( includes ) );
            getLog().debug( "excludes = " + Arrays.toString( excludes ) );
            getLog().debug( "force = " + force );
            getLog().debug( "lessJs = " + lessJs );
        }

        String[] files = getIncludedFiles();

        if ( files == null || files.length < 1 )
        {
            getLog().info( "Nothing to compile - no LESS sources found" );
        }
        else
        {
            if ( getLog().isDebugEnabled() )
            {
                getLog().debug( "included files = " + Arrays.toString( files ) );
            }

            LessCompiler lessCompiler = new LessCompiler();
            lessCompiler.setCompress( compress );
            
            if ( lessJs != null )
            {
                try {
                    lessCompiler.setLessJs(lessJs.toURI().toURL());
                }
                catch (MalformedURLException e) {
                    throw new MojoExecutionException( 
                            "Error while loading LESS JavaScript: " + lessJs.getAbsolutePath(), e );
                }
            }

            for ( String file : files )
            {
                File input = new File( sourceDirectory, file );
                File output = new File( outputDirectory, file.replace( ".less", ".css" ) );

                if ( !output.getParentFile().exists() && !output.getParentFile().mkdirs() )
                {
                    throw new MojoExecutionException( "Cannot create output directory " + output.getParentFile() );
                }

                try
                {
                    LessSource lessSource = new LessSource(input);
                    
                    if ( output.lastModified() < lessSource.getLastModifiedIncludingImports() ) {
                        getLog().info( "Compiling LESS source: " + file + "..." );
                        lessCompiler.compile( lessSource, output, force );
                    }
                    else {
                        getLog().info( "Bypassing LESS source: " + file + " (not modified)");
                    }
                }
                catch ( IOException e )
                {
                    throw new MojoExecutionException( "Error while compiling LESS source: " + file, e );
                }
                catch ( LessException e )
                {
                    throw new MojoExecutionException( "Error while compiling LESS source: " + file, e );
                }
            }
            
            getLog().info( "Compilation finished in " + (System.currentTimeMillis() - start) + " ms" );
        }
    }
}