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