two lines between every subroutine; drop paragraph

data/annotated-snake.asm

@@ -3,8 +3,10 @@
 ; \__ \ ' \/ _` | / / -_) _ \__ \ () / /
 ; |___/_||_\__,_|_\_\___\___/___/\__/___|
 
+
 ; Change direction: W A S D
 
+
   lda $00 
   lda $01 ; instruction comment
 
@@ -12,9 +14,9 @@
   lda $00 
   lda $01 ; instruction comment
 
+
 labeled:
   ; This is a subroutine description
-
   lda $00 
   lda $01 ; instruction comment
 

data/two-paragraphs.txt

@@ -1,5 +1,6 @@
 foo
 bar
 
+
 alpha
 bravo

firepower-demo/src/main/scala/com/htmlism/firepower/demo/PrintPrograms.scala

@@ -1,5 +1,7 @@
 package com.htmlism.firepower.demo
 
+import scala.util.chaining._
+
 import cats.syntax.all._
 
 import com.htmlism.firepower.demo.asm._
@@ -17,66 +19,62 @@ object PrintPrograms extends ZIOAppDefault:
   private val programs =
     List[(String, String)](
       "one-line.txt"        -> "one line",
-      "two-lines.txt"       -> (Line.mkString _)
-        .apply(List("foo", "bar")),
-      "two-paragraphs.txt"  -> (Line.mkString _)
-        .compose(Paragraph.mkLines)
-        .apply(
+      "two-lines.txt"       -> List("foo", "bar")
+        .pipe(Line.mkString),
+      "two-paragraphs.txt"  -> List(
+        List("foo", "bar"),
+        List("alpha", "bravo")
+      )
+        .pipe(xxs => AsmBlock.interFlatMap(xxs)(List("", ""), identity))
+        .pipe(Line.mkString),
+      "annotated-snake.asm" -> List(
+        CommentBlock.fromMultiline(asciiArt),
+        CommentBlock(List("Change direction: W A S D")),
+        AnonymousCodeBlock(
           List(
-            Paragraph(List("foo", "bar")),
-            Paragraph(List("alpha", "bravo"))
-          )
-        ),
-      "annotated-snake.asm" -> (Line.mkString _)
-        .compose(Paragraph.mkLines)
-        .compose((xs: List[AsmBlock]) => xs.flatMap(AsmBlock.toParagraphs))
-        .apply(
-          List(
-            CommentBlock.fromMultiline(asciiArt),
-            CommentBlock(List("Change direction: W A S D")),
-            AnonymousCodeBlock(
+            AsmBlock.Intent(
+              None,
               List(
-                AsmBlock.Intent(
-                  None,
-                  List(
-                    AsmBlock.Intent.Instruction("lda $00", None),
-                    AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
-                  )
-                ),
-                AsmBlock.Intent(
-                  "this block has some preamble".some,
-                  List(
-                    AsmBlock.Intent.Instruction("lda $00", None),
-                    AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
-                  )
-                )
+                AsmBlock.Intent.Instruction("lda $00", None),
+                AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
               )
             ),
-            NamedCodeBlock(
-              "labeled",
-              "This is a subroutine description".some,
+            AsmBlock.Intent(
+              "this block has some preamble".some,
               List(
-                AsmBlock.Intent(
-                  None,
-                  List(
-                    AsmBlock.Intent.Instruction("lda $00", None),
-                    AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
-                  )
-                ),
-                AsmBlock.Intent(
-                  "this block has some preamble".some,
-                  List(
-                    AsmBlock.Intent.Instruction("lda $00", None),
-                    AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
-                  )
-                )
+                AsmBlock.Intent.Instruction("lda $00", None),
+                AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
+              )
+            )
+          )
+        ),
+        NamedCodeBlock(
+          "labeled",
+          "This is a subroutine description".some,
+          List(
+            AsmBlock.Intent(
+              None,
+              List(
+                AsmBlock.Intent.Instruction("lda $00", None),
+                AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
+              )
+            ),
+            AsmBlock.Intent(
+              "this block has some preamble".some,
+              List(
+                AsmBlock.Intent.Instruction("lda $00", None),
+                AsmBlock.Intent.Instruction("lda $01", "instruction comment".some)
               )
             )
           )
         )
+      )
+        .map(AsmBlock.toLines)
+        .pipe(xs => AsmBlock.interFlatMap(xs)(List("", ""), identity))
+        .pipe(Line.mkString)
     )
 
-  lazy val asciiArt =
+  private lazy val asciiArt =
     """ ___           _        __ ___  __ ___
       |/ __|_ _  __ _| |_____ / /| __|/  \_  )
       |\__ \ ' \/ _` | / / -_) _ \__ \ () / /

firepower-demo/src/main/scala/com/htmlism/firepower/demo/asm/AsmBlock.scala

@@ -1,7 +1,5 @@
 package com.htmlism.firepower.demo.asm
 
-import com.htmlism.firepower.demo.str.Paragraph
-
 sealed trait AsmBlock
 
 case class CommentBlock(xs: List[String]) extends AsmBlock
@@ -11,47 +9,47 @@ case class NamedCodeBlock(name: String, comment: Option[String], intents: List[A
 case class AnonymousCodeBlock(intents: List[AsmBlock.Intent]) extends AsmBlock
 
 object AsmBlock:
+  def interFlatMap[A, B](xs: List[A])(x: List[B], f: A => List[B]): List[B] =
+    xs match
+      case head :: tail =>
+        f(head) ::: tail.flatMap(a => x ::: f(a))
+
+      case Nil =>
+        Nil
+
   def toComment(s: String): String =
     "; " + s
 
   def withIndent(s: String): String =
     "  " + s
 
-  def toParagraphs(xs: AsmBlock): List[Paragraph] =
+  def toLines(xs: AsmBlock): List[String] =
     xs match
       case CommentBlock(ys) =>
-        List(
-          Paragraph(ys.map(toComment))
-        )
+        ys.map(toComment)
 
       case NamedCodeBlock(label, oComment, intents) =>
         val headerParagraph =
-          Paragraph(
-            List(label + ":") ++ oComment.map(toComment).map(withIndent).toList
-          )
+          List(label + ":") ++ oComment.map(toComment).map(withIndent).toList
 
         val intentParagraphs =
-          intents
-            .map(Intent.toParagraph)
+          interFlatMap(intents)(List(""), Intent.toLines)
 
-        headerParagraph :: intentParagraphs
+        headerParagraph ::: intentParagraphs
 
       case AnonymousCodeBlock(intents) =>
-        intents
-          .map(Intent.toParagraph)
+        interFlatMap(intents)(List(""), Intent.toLines)
 
   case class Intent(label: Option[String], instructions: List[Intent.Instruction])
 
   object Intent:
     case class Instruction(code: String, comment: Option[String])
 
-    def toParagraph(x: Intent): Paragraph =
-      Paragraph(
-        x.label.map(toComment).map(withIndent).toList ++ x
-          .instructions
-          .map(i => i.code + i.comment.map(toComment).map(" " + _).getOrElse(" "))
-          .map(withIndent)
-      )
+    def toLines(x: Intent): List[String] =
+      x.label.map(toComment).map(withIndent).toList ++ x
+        .instructions
+        .map(i => i.code + i.comment.map(toComment).map(" " + _).getOrElse(" "))
+        .map(withIndent)
 
 object CommentBlock:
   def fromMultiline(s: String): CommentBlock =

firepower-demo/src/main/scala/com/htmlism/firepower/demo/str/Paragraph.scala

@@ -1,22 +0,0 @@
-package com.htmlism.firepower.demo.str
-
-/**
-  * An abstraction for groups of lines that are eventually separated by newlines, but between paragraphs there's an
-  * extra newline
-  */
-case class Paragraph(xs: List[String])
-
-object Paragraph:
-  def apply(xs: String*): Paragraph =
-    Paragraph(xs.toList)
-
-  def mkLines(ps: List[Paragraph]): List[String] =
-    interFlatMap(ps)(List(""), _.xs)
-
-  def interFlatMap[A, B](xs: List[A])(x: List[B], f: A => List[B]): List[B] =
-    xs match
-      case head :: tail =>
-        f(head) ::: tail.flatMap(a => x ::: f(a))
-
-      case Nil =>
-        Nil