add in-built logging support for a better dev experience

vendor/github.com/aybabtme/humanlog/handler.go

@@ -0,0 +1,108 @@
+package humanlog
+
+import (
+	"time"
+
+	"github.com/fatih/color"
+	"github.com/kr/logfmt"
+)
+
+// Handler can recognize it's log lines, parse them and prettify them.
+type Handler interface {
+	CanHandle(line []byte) bool
+	Prettify(skipUnchanged bool) []byte
+	logfmt.Handler
+}
+
+var DefaultOptions = &HandlerOptions{
+	SortLongest:    true,
+	SkipUnchanged:  true,
+	Truncates:      true,
+	LightBg:        false,
+	TruncateLength: 15,
+	TimeFormat:     time.Stamp,
+
+	KeyColor:              color.New(color.FgGreen),
+	ValColor:              color.New(color.FgHiWhite),
+	TimeLightBgColor:      color.New(color.FgBlack),
+	TimeDarkBgColor:       color.New(color.FgWhite),
+	MsgLightBgColor:       color.New(color.FgBlack),
+	MsgAbsentLightBgColor: color.New(color.FgHiBlack),
+	MsgDarkBgColor:        color.New(color.FgHiWhite),
+	MsgAbsentDarkBgColor:  color.New(color.FgWhite),
+	DebugLevelColor:       color.New(color.FgMagenta),
+	InfoLevelColor:        color.New(color.FgCyan),
+	WarnLevelColor:        color.New(color.FgYellow),
+	ErrorLevelColor:       color.New(color.FgRed),
+	PanicLevelColor:       color.New(color.BgRed),
+	FatalLevelColor:       color.New(color.BgHiRed, color.FgHiWhite),
+	UnknownLevelColor:     color.New(color.FgMagenta),
+}
+
+type HandlerOptions struct {
+	Skip           map[string]struct{}
+	Keep           map[string]struct{}
+	SortLongest    bool
+	SkipUnchanged  bool
+	Truncates      bool
+	LightBg        bool
+	TruncateLength int
+	TimeFormat     string
+
+	KeyColor              *color.Color
+	ValColor              *color.Color
+	TimeLightBgColor      *color.Color
+	TimeDarkBgColor       *color.Color
+	MsgLightBgColor       *color.Color
+	MsgAbsentLightBgColor *color.Color
+	MsgDarkBgColor        *color.Color
+	MsgAbsentDarkBgColor  *color.Color
+	DebugLevelColor       *color.Color
+	InfoLevelColor        *color.Color
+	WarnLevelColor        *color.Color
+	ErrorLevelColor       *color.Color
+	PanicLevelColor       *color.Color
+	FatalLevelColor       *color.Color
+	UnknownLevelColor     *color.Color
+}
+
+func (h *HandlerOptions) shouldShowKey(key string) bool {
+	if len(h.Keep) != 0 {
+		if _, keep := h.Keep[key]; keep {
+			return true
+		}
+	}
+	if len(h.Skip) != 0 {
+		if _, skip := h.Skip[key]; skip {
+			return false
+		}
+	}
+	return true
+}
+
+func (h *HandlerOptions) shouldShowUnchanged(key string) bool {
+	if len(h.Keep) != 0 {
+		if _, keep := h.Keep[key]; keep {
+			return true
+		}
+	}
+	return false
+}
+
+func (h *HandlerOptions) SetSkip(skip []string) {
+	if h.Skip == nil {
+		h.Skip = make(map[string]struct{})
+	}
+	for _, key := range skip {
+		h.Skip[key] = struct{}{}
+	}
+}
+
+func (h *HandlerOptions) SetKeep(keep []string) {
+	if h.Keep == nil {
+		h.Keep = make(map[string]struct{})
+	}
+	for _, key := range keep {
+		h.Keep[key] = struct{}{}
+	}
+}