Check for io.Writer

writter.go

@@ -0,0 +1,23 @@
+package isatty
+
+import "io"
+
+// IsWriterTerminal return true if the writer is terminal.
+func IsWriterTerminal(w io.Writer) bool {
+	if f, ok := w.(filelike); ok {
+		return IsTerminal(f.Fd())
+	}
+	return false
+}
+
+// IsWriterCygwinTerminal return true if the writer is a cygwin or msys2 terminal.
+func IsWriterCygwinTerminal(w io.Writer) bool {
+	if f, ok := w.(filelike); ok {
+		return IsCygwinTerminal(f.Fd())
+	}
+	return false
+}
+
+type filelike interface {
+	Fd() uintptr
+}

writter_test.go

@@ -0,0 +1,18 @@
+package isatty_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/mattn/go-isatty"
+)
+
+func TestIsWriterTerminal(t *testing.T) {
+	// test for non-panic
+	isatty.IsWriterTerminal(os.Stdout)
+}
+
+func TestIsWriterCygwinTerminal(t *testing.T) {
+	// test for non-panic
+	isatty.IsWriterCygwinTerminal(os.Stdout)
+}