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color.go
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color.go
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// Copyright 2013 Google Inc. All Rights Reserved.
// Copyright 2017 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package log
import (
"os"
"runtime"
"strings"
)
// colorProfile defines escape sequences which provide color in
// terminals. Some terminals support 8 colors, some 256, others
// none at all.
type colorProfile struct {
infoPrefix []byte
warnPrefix []byte
errorPrefix []byte
timePrefix []byte
}
var colorReset = []byte("\033[0m")
// For terms with 8-color support.
var colorProfile8 = &colorProfile{
infoPrefix: []byte("\033[0;36;49m"),
warnPrefix: []byte("\033[0;33;49m"),
errorPrefix: []byte("\033[0;31;49m"),
timePrefix: []byte("\033[2;37;49m"),
}
// For terms with 256-color support.
var colorProfile256 = &colorProfile{
infoPrefix: []byte("\033[38;5;33m"),
warnPrefix: []byte("\033[38;5;214m"),
errorPrefix: []byte("\033[38;5;160m"),
timePrefix: []byte("\033[38;5;246m"),
}
// the --no-color flag.
var noColor bool
var stderrColorProfile = func() *colorProfile {
if noColor {
return nil
}
// Determine whether stderr is a character device and if so, that
// the terminal supports color output.
fi, err := OrigStderr.Stat()
if err != nil {
// Stat() will return an error on Windows in both Powershell and
// console until go1.9. See https://github.com/golang/go/issues/14853.
//
// Note that this bug does not affect MSYS/Cygwin terminals.
//
// TODO(bram): remove this hack once we move to go 1.9.
//
// Console does not support our color profiles but
// Powershell supports colorProfile256. Sadly, detecting the
// shell is not well supported, so default to no-color.
if runtime.GOOS != "windows" {
panic(err)
}
return nil
}
if (fi.Mode() & os.ModeCharDevice) != 0 {
term := os.Getenv("TERM")
switch term {
case "ansi", "tmux":
return colorProfile8
case "st":
return colorProfile256
default:
if strings.HasSuffix(term, "256color") {
return colorProfile256
}
if strings.HasSuffix(term, "color") || strings.HasPrefix(term, "screen") {
return colorProfile8
}
}
}
return nil
}()