From 48002435730cf94c39d8fb11389e0b8f14075ca2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Chris=20Suszy=C5=84ski?= <ksuszyns@redhat.com>
Date: Tue, 28 Feb 2023 13:10:58 +0100
Subject: [PATCH] A check for io.Writer

---
 writter.go      | 23 +++++++++++++++++++++++
 writter_test.go | 18 ++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 writter.go
 create mode 100644 writter_test.go

diff --git a/writter.go b/writter.go
new file mode 100644
index 0000000..ab8799f
--- /dev/null
+++ b/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
+}
diff --git a/writter_test.go b/writter_test.go
new file mode 100644
index 0000000..a6b0a89
--- /dev/null
+++ b/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)
+}