com.metreeca.mark.pipes.Less Maven / Gradle / Ivy

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A minimalist static site generator.

There is a newer version: 0.9.1

/*
 * Copyright © 2019-2022 Metreeca srl
 *
 * 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.metreeca.mark.pipes;

import com.metreeca.mark.*;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;
import java.util.Optional;

import static com.inet.lib.less.Less.compile;

import static java.nio.charset.StandardCharsets.UTF_8;


public final class Less implements Pipe {

	private final Mark mark;


	public Less(final Mark mark) {

		if ( mark == null ) {
			throw new NullPointerException("null mark");
		}

		this.mark=mark;
	}


	@Override public Optional process(final Path source) {
		return mark.target(source, ".css", ".css", ".less").map(target ->
				new File(target, Map.of(), (path, model) -> {
					try {

						final String less=Files.readString(source);
						final String css=compile(path.toUri().toURL(), less, true);

						Files.write(path, css.getBytes(UTF_8));

					} catch ( final IOException e ) {
						throw new UncheckedIOException(e);
					}
				})
		);
	}

}