com.asual.lesscss.LessEngineCli.java Source code

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Here is the source code for com.asual.lesscss.LessEngineCli.java

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/*
 * 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 com.asual.lesscss;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.net.URISyntaxException;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

/**
 * @author Rostislav Hristov
 */
public class LessEngineCli {

    public static void main(String[] args) throws LessException, URISyntaxException {
        Options cmdOptions = new Options();
        cmdOptions.addOption(LessOptions.CHARSET_OPTION, true, "Input file charset encoding. Defaults to UTF-8.");
        cmdOptions.addOption(LessOptions.COMPRESS_OPTION, false, "Flag that enables compressed CSS output.");
        cmdOptions.addOption(LessOptions.CSS_OPTION, false, "Flag that enables compilation of .css files.");
        cmdOptions.addOption(LessOptions.LESS_OPTION, true, "Path to a custom less.js for Rhino version.");
        try {
            CommandLineParser cmdParser = new GnuParser();
            CommandLine cmdLine = cmdParser.parse(cmdOptions, args);
            LessOptions options = new LessOptions();
            if (cmdLine.hasOption(LessOptions.CHARSET_OPTION)) {
                options.setCharset(cmdLine.getOptionValue(LessOptions.CHARSET_OPTION));
            }
            if (cmdLine.hasOption(LessOptions.COMPRESS_OPTION)) {
                options.setCompress(true);
            }
            if (cmdLine.hasOption(LessOptions.CSS_OPTION)) {
                options.setCss(true);
            }
            if (cmdLine.hasOption(LessOptions.LESS_OPTION)) {
                options.setLess(new File(cmdLine.getOptionValue(LessOptions.LESS_OPTION)).toURI().toURL());
            }
            LessEngine engine = new LessEngine(options);
            if (System.in.available() != 0) {
                BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
                StringWriter sw = new StringWriter();
                char[] buffer = new char[1024];
                int n = 0;
                while (-1 != (n = in.read(buffer))) {
                    sw.write(buffer, 0, n);
                }
                String src = sw.toString();
                if (!src.isEmpty()) {
                    System.out.println(engine.compile(src, null, options.isCompress()));
                    System.exit(0);
                }
            }
            String[] files = cmdLine.getArgs();
            if (files.length == 1) {
                System.out.println(engine.compile(new File(files[0]), options.isCompress()));
                System.exit(0);
            }
            if (files.length == 2) {
                engine.compile(new File(files[0]), new File(files[1]), options.isCompress());
                System.exit(0);
            }

        } catch (IOException ioe) {
            System.err.println("Error opening input file.");
        } catch (ParseException pe) {
            System.err.println("Error parsing arguments.");
        }
        String[] paths = LessEngine.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()
                .split(File.separator);
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("java -jar " + paths[paths.length - 1] + " input [output] [options]", cmdOptions);
        System.exit(1);
    }

}