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package middleware
import (
"bytes"
"fmt"
"os"
)
var (
// Normal colors
nBlack = []byte{'\033', '[', '3', '0', 'm'}
nRed = []byte{'\033', '[', '3', '1', 'm'}
nGreen = []byte{'\033', '[', '3', '2', 'm'}
nYellow = []byte{'\033', '[', '3', '3', 'm'}
nBlue = []byte{'\033', '[', '3', '4', 'm'}
nMagenta = []byte{'\033', '[', '3', '5', 'm'}
nCyan = []byte{'\033', '[', '3', '6', 'm'}
nWhite = []byte{'\033', '[', '3', '7', 'm'}
// Bright colors
bBlack = []byte{'\033', '[', '3', '0', ';', '1', 'm'}
bRed = []byte{'\033', '[', '3', '1', ';', '1', 'm'}
bGreen = []byte{'\033', '[', '3', '2', ';', '1', 'm'}
bYellow = []byte{'\033', '[', '3', '3', ';', '1', 'm'}
bBlue = []byte{'\033', '[', '3', '4', ';', '1', 'm'}
bMagenta = []byte{'\033', '[', '3', '5', ';', '1', 'm'}
bCyan = []byte{'\033', '[', '3', '6', ';', '1', 'm'}
bWhite = []byte{'\033', '[', '3', '7', ';', '1', 'm'}
reset = []byte{'\033', '[', '0', 'm'}
)
var isTTY bool
func init() {
// This is sort of cheating: if stdout is a character device, we assume
// that means it's a TTY. Unfortunately, there are many non-TTY
// character devices, but fortunately stdout is rarely set to any of
// them.
//
// We could solve this properly by pulling in a dependency on
// code.google.com/p/go.crypto/ssh/terminal, for instance, but as a
// heuristic for whether to print in color or in black-and-white, I'd
// really rather not.
fi, err := os.Stdout.Stat()
if err == nil {
m := os.ModeDevice | os.ModeCharDevice
isTTY = fi.Mode()&m == m
}
}
// colorWrite
func cW(buf *bytes.Buffer, color []byte, s string, args ...interface{}) {
if isTTY {
buf.Write(color)
}
fmt.Fprintf(buf, s, args...)
if isTTY {
buf.Write(reset)
}
}
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