--- /dev/null
+// +build appengine
+
+package colorable
+
+import (
+ "io"
+ "os"
+
+ _ "github.com/mattn/go-isatty"
+)
+
+// NewColorable return new instance of Writer which handle escape sequence.
+func NewColorable(file *os.File) io.Writer {
+ if file == nil {
+ panic("nil passed instead of *os.File to NewColorable()")
+ }
+
+ return file
+}
+
+// NewColorableStdout return new instance of Writer which handle escape sequence for stdout.
+func NewColorableStdout() io.Writer {
+ return os.Stdout
+}
+
+// NewColorableStderr return new instance of Writer which handle escape sequence for stderr.
+func NewColorableStderr() io.Writer {
+ return os.Stderr
+}