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๐ŸŒˆ slog.Handler that writes tinted (colorized) logs, with modifications to use Gtihub Actions Workflow Commands

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This is a fork of github.com/lmittmann/tint

A few things have been changed, specifically error and warning logs are now prefixed with ::error:: and ::warning:: respectively. This means they show up better in the output and summary of Github Actions runs.

Info and debug logs are unchanged, since we don't need them in the summary.

Documentation: Setting a warning message

tint: ๐ŸŒˆ slog.Handler that writes tinted logs

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Package tint implements a zero-dependency slog.Handler that writes tinted (colorized) logs. Its output format is inspired by the zerolog.ConsoleWriter and slog.TextHandler.

The output format can be customized using Options which is a drop-in replacement for slog.HandlerOptions.

go get github.com/lmittmann/tint

Usage

w := os.Stderr

// create a new logger
logger := slog.New(tint.NewHandler(w, nil))

// set global logger with custom options
slog.SetDefault(slog.New(
    tint.NewHandler(w, &tint.Options{
        Level:      slog.LevelDebug,
        TimeFormat: time.Kitchen,
    }),
))

Customize Attributes

ReplaceAttr can be used to alter or drop attributes. If set, it is called on each non-group attribute before it is logged. See slog.HandlerOptions for details.

// create a new logger that doesn't write the time
w := os.Stderr
logger := slog.New(
    tint.NewHandler(w, &tint.Options{
        ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
            if a.Key == slog.TimeKey && len(groups) == 0 {
                return slog.Attr{}
            }
            return a
        },
    }),
)

Automatically Enable Colors

Colors are enabled by default and can be disabled using the Options.NoColor attribute. To automatically enable colors based on the terminal capabilities, use e.g. the go-isatty package.

w := os.Stderr
logger := slog.New(
    tint.NewHandler(w, &tint.Options{
        NoColor: !isatty.IsTerminal(w.Fd()),
    }),
)

Windows Support

Color support on Windows can be added by using e.g. the go-colorable package.

w := os.Stderr
logger := slog.New(
    tint.NewHandler(colorable.NewColorable(w), nil),
)

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๐ŸŒˆ slog.Handler that writes tinted (colorized) logs, with modifications to use Gtihub Actions Workflow Commands

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