Package term provides tools for logging to a terminal.
Deprecated: Use github.com/go-kit/log/term instead.
ANSI colors.
This section is empty.
IsTerminal returns true if w writes to a terminal.
NewColorLogger returns a Logger which writes colored logs to w. ANSI color codes for the colors returned by color are added to the formatted output from the Logger returned by newLogger and the combined result written to w.
NewColorWriter returns an io.Writer that writes to w and provides cross platform support for ANSI color codes. If w is not a terminal it is returned unmodified.
NewLogger returns a Logger that takes advantage of terminal features if possible. Log events are formatted by the Logger returned by newLogger. If w is a terminal each log event is colored according to the color function.
package main
import (
"os"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/term"
)
func main() {
// Color by level value
colorFn := func(keyvals ...interface{}) term.FgBgColor {
for i := 0; i < len(keyvals)-1; i += 2 {
if keyvals[i] != "level" {
continue
}
switch keyvals[i+1] {
case "debug":
return term.FgBgColor{Fg: term.DarkGray}
case "info":
return term.FgBgColor{Fg: term.Gray}
case "warn":
return term.FgBgColor{Fg: term.Yellow}
case "error":
return term.FgBgColor{Fg: term.Red}
case "crit":
return term.FgBgColor{Fg: term.Gray, Bg: term.DarkRed}
default:
return term.FgBgColor{}
}
}
return term.FgBgColor{}
}
logger := term.NewLogger(os.Stdout, log.NewJSONLogger, colorFn)
logger.Log("level", "warn", "msg", "yellow")
logger.Log("level", "debug", "msg", "dark gray")
}
package main
import (
"errors"
"os"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/term"
)
func main() {
// Color errors red
colorFn := func(keyvals ...interface{}) term.FgBgColor {
for i := 1; i < len(keyvals); i += 2 {
if _, ok := keyvals[i].(error); ok {
return term.FgBgColor{Fg: term.White, Bg: term.Red}
}
}
return term.FgBgColor{}
}
logger := term.NewLogger(os.Stdout, log.NewLogfmtLogger, colorFn)
logger.Log("msg", "default color", "err", nil)
logger.Log("msg", "colored because of error", "err", errors.New("coloring error"))
}
Color represents an ANSI color. The zero value is Default.
FgBgColor represents a foreground and background color.
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