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    <p>The <a href="https://stackoverflow.com/a/20181011/1017211" title="answer">answer</a> from Akos Krivachy is pretty close, but since I can't append my complete solution to it I have to create a new separate answer (this feature of SO seems a bit weird to me).</p> <pre><code>object ApplyTroubles2 extends App { import GrepOption.GrepOption abstract class Builder { var parent: Builder = null def getOutput: String def append(ch: Builder) = { ch.parent = this; ch } def echo(s: String) = append(new Echo(s)) def wc() = append(new Wc()) def grep(s: String, opts: Set[GrepOption]) = append(new Grep(s, opts)) def grep(s: String) = append(new Grep(s)) } object MainBuilder extends Builder { def getOutput: String = "" override def append(ch: Builder): Builder = ch } class Echo(data: String) extends Builder { def getOutput = data } class Wc() extends Builder { def getOutput = parent.getOutput.size.toString } class Grep(var pattern: String, options: Set[GrepOption]) extends Builder { def this(pattern: String) = this(pattern, Set.empty) val isCaseInsensitive = options.contains(GrepOption.CASE_INSENSITIVE) if (isCaseInsensitive) pattern = pattern.toLowerCase def getOutput = { val input = if (isCaseInsensitive) parent.getOutput.toLowerCase else parent.getOutput if (input.contains(pattern)) input else "" } } object GrepOption extends Enumeration { type GrepOption = Value val CASE_INSENSITIVE = Value } // all above is un-touchable (e.g. code of a library I want to pimp out) // all bellow are the pimps I wanted // ( // based on this answer [https://stackoverflow.com/a/20181011/1017211] // from Akos Krivachy [https://stackoverflow.com/users/1697985/akos-krivachy] // ) object MyBuilder { type MyBuilderTransformer = MyBuilder =&gt; MyBuilder def builderFunc(func: Builder =&gt; Builder): MyBuilderTransformer = (x: MyBuilder) =&gt; {func(x.builder).wrap} // methods in original library without parameters can be represented as vals val wc: MyBuilderTransformer = builderFunc(_.wc()) // when it has parameters it must be def, we need to pack params def grep(s: String): MyBuilderTransformer = builderFunc(_.grep(s)) def grep(s: String, ss: Set[GrepOption]): MyBuilderTransformer = builderFunc(_.grep(s, ss)) // root expression, differs a bit from original, but in this case it's good enough def fromString(msg: String): MyBuilder = MyBuilder(MainBuilder.echo(msg)) } // wrapper class case class MyBuilder(builder: Builder) implicit class BuilderPimps(b: Builder) { def wrap = MyBuilder(b) } implicit class MyBuilderPimps(b: MyBuilder) { def |(fn: MyBuilder =&gt; MyBuilder): MyBuilder = fn(b) def getStringOutput: String = b.builder.getOutput def &gt;&gt; : String = getStringOutput } // this all works (shows how an end user would use this pimps) import MyBuilder._ println(fromString("abc") | wc getStringOutput) println(fromString("abc") | wc &gt;&gt;) println(fromString("abc") | grep("b") | wc getStringOutput) println(fromString("abc") | grep("b") | wc &gt;&gt;) println(fromString("abc") | grep("B", Set(GrepOption.CASE_INSENSITIVE)) | wc getStringOutput) println(fromString("abc") | grep("B", Set(GrepOption.CASE_INSENSITIVE)) | wc &gt;&gt;) println(fromString("abc") | grep("y", Set(GrepOption.CASE_INSENSITIVE)) | wc getStringOutput) println(fromString("abc") | grep("y", Set(GrepOption.CASE_INSENSITIVE)) | wc &gt;&gt;) } </code></pre>
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