laika.markdown.bundle.HeaderIdInsertion.scala Maven / Gradle / Ivy

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/*
 * Copyright 2013-2018 the original author or authors.
 *
 * 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 laika.markdown.bundle

import laika.ast.{Block, Header, Id}

/** Block list post-processor that auto-generates ids for
  * headers so that they can serve as link target within
  * the same document or as cross-link targets from other
  * documents.
  *
  * This extension is disabled when Markdown is parsed in strict mode.
  *
  * @author Jens Halm
  */
object HeaderIdInsertion extends (Seq[Block] => Seq[Block]) {

  def apply (blocks: Seq[Block]): Seq[Block] = blocks.map {
    case h: Header => h.copy(options = h.options + Id(h.extractText.replaceAll("[\n ]+", " ").toLowerCase))
    case other => other
  }

}