Added output configurations. Related to #3170

io/shared/src/main/scala/fs2/io/process/ProcessBuilder.scala

@@ -49,6 +49,9 @@ sealed abstract class ProcessBuilder private {
     */
   def workingDirectory: Option[Path]
 
+  /** Configures how stdout and stderr should be handled. */
+  def outputMode: ProcessOutputMode
+
   /** @see [[command]] */
   def withCommand(command: String): ProcessBuilder
 
@@ -67,17 +70,29 @@ sealed abstract class ProcessBuilder private {
   /** @see [[workingDirectory]] */
   def withCurrentWorkingDirectory: ProcessBuilder
 
+  /** @see [[outputMode]] */
+  def withOutputMode(outputMode: ProcessOutputMode): ProcessBuilder
+
   /** Starts the process and returns a handle for interacting with it.
     * Closing the resource will kill the process if it has not already terminated.
     */
   final def spawn[F[_]: Processes]: Resource[F, Process[F]] =
     Processes[F].spawn(this)
 }
 
+sealed trait ProcessOutputMode
+object ProcessOutputMode {
+  case object Separate extends ProcessOutputMode // stdout and stderr are separate
+  case object Merged extends ProcessOutputMode   // stderr is redirected to stdout
+  case class FileOutput(path: Path) extends ProcessOutputMode // Output to file
+  case object Inherit extends ProcessOutputMode  // Inherit parent process's streams
+  case object Ignore extends ProcessOutputMode   // Discard output
+}
+
 object ProcessBuilder {
 
   def apply(command: String, args: List[String]): ProcessBuilder =
-    ProcessBuilderImpl(command, args, true, Map.empty, None)
+    ProcessBuilderImpl(command, args, true, Map.empty, None, ProcessOutputMode.Separate)
 
   def apply(command: String, args: String*): ProcessBuilder =
     apply(command, args.toList)
@@ -87,7 +102,8 @@ object ProcessBuilder {
       args: List[String],
       inheritEnv: Boolean,
       extraEnv: Map[String, String],
-      workingDirectory: Option[Path]
+      workingDirectory: Option[Path],
+      outputMode: ProcessOutputMode
   ) extends ProcessBuilder {
 
     def withCommand(command: String): ProcessBuilder = copy(command = command)
@@ -100,7 +116,9 @@ object ProcessBuilder {
 
     def withWorkingDirectory(workingDirectory: Path): ProcessBuilder =
       copy(workingDirectory = Some(workingDirectory))
+
     def withCurrentWorkingDirectory: ProcessBuilder = copy(workingDirectory = None)
-  }
 
+    def withOutputMode(outputMode: ProcessOutputMode): ProcessBuilder = copy(outputMode = outputMode)
+  }
 }