short-name aliasing

Add support for short-name aliasing.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/juju/ansiterm/terminal.go

@@ -0,0 +1,32 @@
+// Copyright 2016 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package ansiterm
+
+import (
+	"io"
+	"os"
+
+	"github.com/mattn/go-colorable"
+	"github.com/mattn/go-isatty"
+)
+
+// colorEnabledWriter returns a writer that can handle the ansi color codes
+// and true if the writer passed in is a terminal capable of color. If the
+// TERM environment variable is set to "dumb", the terminal is not considered
+// color capable.
+func colorEnabledWriter(w io.Writer) (io.Writer, bool) {
+	f, ok := w.(*os.File)
+	if !ok {
+		return w, false
+	}
+	// Check the TERM environment variable specifically
+	// to check for "dumb" terminals.
+	if os.Getenv("TERM") == "dumb" {
+		return w, false
+	}
+	if !isatty.IsTerminal(f.Fd()) {
+		return w, false
+	}
+	return colorable.NewColorable(f), true
+}