Yet another Go logging library for user-friendly applications, with colors!
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package log
import (
"bytes"
"fmt"
"text/template"
"time"
"git.kirsle.net/go/log/ansi"
)
// Convenient log formats to use in your logger.
const (
// DefaultFormat: shows the date in the secondary (dark) color, the label
// in the bright color, and the message text in the normal color.
DefaultFormat = `{{.Secondary}}{{.Time}}{{.Reset}} {{.Primary}}[{{.Level}}]{{.Reset}} {{.Message}}`
// ColorfulFormat: like the DefaultFormat, but the message itself is also
// colored using the secondary color.
ColorfulFormat = `{{.Secondary}}{{.Time}}{{.Reset}} {{.Primary}}[{{.Level}}]{{.Reset}} {{.Secondary}}{{.Message}}{{.Reset}}`
)
// Convenient time formats to use in your logger.
const (
// DefaultTime is the default, in `yyyy-mm-dd hh:mm:ss` format.
DefaultTime = `2006-01-02 15:04:05`
// FriendlyTime is a human readable `Jan 2 15:04:05 2006` format.
FriendlyTime = `Jan 2 15:04:05 2006`
)
// formatter provides the variables that can be used in the log format.
type formatter struct {
Time string
Level string
Message string
Primary string
Secondary string
Reset string
}
// Format and return a log message.
func (l *Logger) Format(level logLevel, tmpl string, args ...interface{}) string {
// Prepare the variables to apply to the log message format.
format := formatter{
Time: time.Now().Format(l.Config.TimeFormat),
Level: levelNames[level],
Message: fmt.Sprintf(tmpl, args...),
}
// Find the theme color to use.
if interactive && l.Config.Colors != NoColor {
var (
primary ThemeColor
secondary ThemeColor
)
switch level {
case DebugLevel:
primary = l.Config.Theme.Debug
secondary = l.Config.Theme.DebugSecondary
case InfoLevel:
primary = l.Config.Theme.Info
secondary = l.Config.Theme.InfoSecondary
case WarnLevel:
primary = l.Config.Theme.Warn
secondary = l.Config.Theme.WarnSecondary
case ErrorLevel:
primary = l.Config.Theme.Error
secondary = l.Config.Theme.ErrorSecondary
}
// What color level are we supporting?
if l.Config.Colors == ANSIColor {
format.Primary = fmt.Sprintf("\x1B[%sm", primary.ANSI)
format.Secondary = fmt.Sprintf("\x1B[%sm", secondary.ANSI)
format.Reset = fmt.Sprintf("\x1B[%sm", ansi.Reset)
} else if l.Config.Colors == ExtendedColor {
format.Primary = fmt.Sprintf("\x1B[%sm", primary.Extended)
format.Secondary = fmt.Sprintf("\x1B[%sm", secondary.Extended)
format.Reset = fmt.Sprintf("\x1B[%sm", ansi.Reset)
}
}
// Do we have the template cached?
if l.template == nil {
template, err := template.New("golog").Parse(l.Config.Format)
if err != nil {
return fmt.Sprintf("[GoLog format error: %s]", err)
}
l.template = template
}
// Evaluate the template.
var buf bytes.Buffer
err := l.template.Execute(&buf, format)
if err != nil {
return fmt.Sprintf("[GoLog template error: %s]", err)
}
return buf.String()
}