laika.helium.generate.MergedCSSGenerator.scala Maven / Gradle / Ivy

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/*
 * Copyright 2012-2020 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.helium.generate

import cats.effect.{Async, Concurrent}
import cats.implicits._
import laika.ast.Path.Root
import laika.io.model.{BinaryInput, InputTree}

private[helium] object MergedCSSGenerator {

  private def merge[F[_]: Concurrent] (inputs: Seq[BinaryInput[F]]): F[String] =
    inputs.toList
      .traverse(_.input.through(fs2.text.utf8.decode).compile.string)
      .map(_.mkString("\n\n"))
  
  def mergeSiteCSS[F[_]: Async](varBlock: String): F[String] = {

    val inputTree = InputTree[F]
      .addClassLoaderResource("laika/helium/css/container.css", Root / "css" / "container.css")
      .addClassLoaderResource("laika/helium/css/content.css", Root / "css" / "content.css")
      .addClassLoaderResource("laika/helium/css/nav.css", Root / "css" / "nav.css")
      .addClassLoaderResource("laika/helium/css/code.css", Root / "css" / "code.css")
      .addClassLoaderResource("laika/helium/css/toc.css", Root / "css" / "toc.css")
      .build
    
    for {
      inputs <- inputTree
      merged <- merge(inputs.binaryInputs)
    } yield varBlock + merged
  }

  def mergeEPUBCSS[F[_]: Async](varBlock: String): F[String] = {
    
    val importantVars = 
      (1 to 5).map("syntax-wheel" + _) ++ 
      (1 to 5).map("syntax-base" + _) ++ 
      Seq("primary-color", "secondary-color")
      
    def addImportantAnnotation (css: String): String =
      importantVars.map(v => s"var(--$v);").foldLeft(css) { (str, substr) =>
        str.replace(substr, substr.dropRight(1) + " !important;")
      }

    val inputTree = InputTree[F]
      .addClassLoaderResource("laika/helium/css/content.epub.css", Root / "css" / "content.css")
      .addClassLoaderResource("laika/helium/css/toc.css", Root / "css" / "content.css")
      .addClassLoaderResource("laika/helium/css/code.css", Root / "css" / "code.css")
      .addClassLoaderResource("laika/helium/css/code.epub.css", Root / "css" / "code.epub.css")
      .build

    for {
      inputs <- inputTree
      merged <- merge(inputs.binaryInputs)
    } yield varBlock + addImportantAnnotation(merged)
  }
  
}