refactor: improve resource safety and structure of writer

src/main/wacc/backend/writer.scala

@@ -13,15 +13,30 @@ import java.nio.file.Path
 object writer {
   import assemblyIR._
 
+  // TODO: Judging from documentation it seems as though IO.blocking is the correct choice
+  // But needs checking
+
+  /** Creates a resource safe BufferedWriter */
+  private def bufferedWriter(outputPath: Path): Resource[IO, BufferedWriter] =
+    Resource.make {
+      IO.blocking(new BufferedWriter(new FileWriter(outputPath.toFile, StandardCharsets.UTF_8)))
+    } { writer =>
+      IO.blocking(writer.close())
+        .handleErrorWith(_ => IO.unit) // TODO: ensures writer is closed even if an error occurs
+    }
+
+  /** Write line safely into a BufferedWriter */
+  private def writeLines(writer: BufferedWriter, lines: Chain[AsmLine]): IO[Unit] =
+    IO.blocking {
+      lines.iterator.foreach { line =>
+        writer.write(line.toString)
+        writer.newLine()
+      }
+    }
+
+  /** Main function to write assembly to a file */
   def writeTo(asmList: Chain[AsmLine], outputPath: Path)(using logger: Logger[IO]): IO[Unit] =
-    Resource
-      .fromAutoCloseable {
-        IO(BufferedWriter(FileWriter(outputPath.toFile, StandardCharsets.UTF_8)))
-      }
-      .use { writer =>
-        IO {
-          asmList.iterator.foreach(line => writer.write(line.toString + "\n"))
-          writer.flush() // TODO: NECESSARY OR NOT?
-        } *> logger.info(s"Success: ${outputPath.toAbsolutePath}")
+    bufferedWriter(outputPath).use { writer =>
+      writeLines(writer, asmList) *> logger.info(s"Success: ${outputPath.toAbsolutePath}")
     }
 }