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// Copyright 2018 The Hugo Authors. All rights reserved.
//
// 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 terminal contains helper for the terminal, such as coloring output.
package terminal
import (
"fmt"
"os"
"runtime"
"strings"
isatty "github.com/mattn/go-isatty"
)
const (
errorColor = "\033[1;31m%s\033[0m"
warningColor = "\033[0;33m%s\033[0m"
noticeColor = "\033[1;36m%s\033[0m"
)
// IsTerminal return true if the file descriptor is terminal and the TERM
// environment variable isn't a dumb one.
func IsTerminal(f *os.File) bool {
if runtime.GOOS == "windows" {
return false
}
fd := f.Fd()
return os.Getenv("TERM") != "dumb" && (isatty.IsTerminal(fd) || isatty.IsCygwinTerminal(fd))
}
// Notice colorizes the string in a noticeable color.
func Notice(s string) string {
return colorize(s, noticeColor)
}
// Error colorizes the string in a colour that grabs attention.
func Error(s string) string {
return colorize(s, errorColor)
}
// Warning colorizes the string in a colour that warns.
func Warning(s string) string {
return colorize(s, warningColor)
}
// colorize s in color.
func colorize(s, color string) string {
s = fmt.Sprintf(color, doublePercent(s))
return singlePercent(s)
}
func doublePercent(str string) string {
return strings.Replace(str, "%", "%%", -1)
}
func singlePercent(str string) string {
return strings.Replace(str, "%%", "%", -1)
}
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