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highlight.go
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/
highlight.go
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// (c) 2020, Alex Willmer, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package logging
import (
"errors"
"fmt"
"strings"
"golang.org/x/crypto/ssh/terminal"
)
// Highlighting modes available
const (
Plain Highlight = iota
Colors
)
var errUnknownHighlight = errors.New("unknown highlight")
// Highlight mode to apply to displayed logs
type Highlight int
// ToHighlight chooses a highlighting mode
func ToHighlight(h string, fd uintptr) (Highlight, error) {
switch strings.ToUpper(h) {
case "PLAIN":
return Plain, nil
case "COLORS":
return Colors, nil
case "AUTO":
if !terminal.IsTerminal(int(fd)) {
return Plain, nil
}
return Colors, nil
default:
return Plain, fmt.Errorf("unknown highlight mode: %s", h)
}
}
func (h *Highlight) MarshalJSON() ([]byte, error) {
switch *h {
case Plain:
return []byte("\"PLAIN\""), nil
case Colors:
return []byte("\"COLORS\""), nil
default:
return nil, errUnknownHighlight
}
}