Improvements and CHANGELOG for #651

internal/output/output.go

@@ -1,9 +1,11 @@
 package output
 
 import (
+	"fmt"
 	"io"
-)
 
+	"github.com/go-task/task/v3/taskfile"
+)
 
 // Templater executes a template engine.
 // It is provided by the templater.Templater package.
@@ -15,3 +17,33 @@ type Templater interface {
 type Output interface {
 	WrapWriter(w io.Writer, prefix string, tmpl Templater) io.Writer
 }
+
+// Build the Output for the requested taskfile.Output.
+func BuildFor(o *taskfile.Output) (Output, error) {
+	switch o.Name {
+	case "interleaved", "":
+		if err := checkOutputGroupUnset(o); err != nil {
+			return nil, err
+		}
+		return Interleaved{}, nil
+	case "group":
+		return Group{
+			Begin: o.Group.Begin,
+			End:   o.Group.End,
+		}, nil
+	case "prefixed":
+		if err := checkOutputGroupUnset(o); err != nil {
+			return nil, err
+		}
+		return Prefixed{}, nil
+	default:
+		return nil, fmt.Errorf(`task: output style %q not recognized`, o.Name)
+	}
+}
+
+func checkOutputGroupUnset(o *taskfile.Output) error {
+	if o.Group.IsSet() {
+		return fmt.Errorf("task: output style %q does not support the group begin/end parameter", o.Name)
+	}
+	return nil
+}