1 files changed, 90 insertions, 0 deletions
diff --git a/src/go/logger/handler.go b/src/go/logger/handler.go
new file mode 100644
index 000000000..40282ead6
--- /dev/null
+++ b/src/go/logger/handler.go
@@ -0,0 +1,90 @@
+package logger
+
+import (
+	"context"
+	"log/slog"
+	"os"
+	"runtime"
+	"strings"
+
+	"github.com/lmittmann/tint"
+)
+
+func newTextHandler() slog.Handler {
+	return slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
+		Level: Level.lvl,
+		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
+			switch a.Key {
+			case slog.TimeKey:
+				if isJournal {
+					return slog.Attr{}
+				}
+			case slog.LevelKey:
+				lvl := a.Value.Any().(slog.Level)
+				s, ok := customLevels[lvl]
+				if !ok {
+					s = lvl.String()
+				}
+				return slog.String(a.Key, strings.ToLower(s))
+			}
+			return a
+		},
+	})
+}
+
+func newTerminalHandler() slog.Handler {
+	return tint.NewHandler(os.Stderr, &tint.Options{
+		AddSource: true,
+		Level:     Level.lvl,
+		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
+			switch a.Key {
+			case slog.TimeKey:
+				return slog.Attr{}
+			case slog.SourceKey:
+				if !Level.Enabled(slog.LevelDebug) {
+					return slog.Attr{}
+				}
+			case slog.LevelKey:
+				lvl := a.Value.Any().(slog.Level)
+				if s, ok := customLevelsTerm[lvl]; ok {
+					return slog.String(a.Key, s)
+				}
+			}
+			return a
+		},
+	})
+}
+
+func withCallDepth(depth int, sh slog.Handler) slog.Handler {
+	if v, ok := sh.(*callDepthHandler); ok {
+		sh = v.sh
+	}
+	return &callDepthHandler{depth: depth, sh: sh}
+}
+
+type callDepthHandler struct {
+	depth int
+	sh    slog.Handler
+}
+
+func (h *callDepthHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	return h.sh.Enabled(ctx, level)
+}
+
+func (h *callDepthHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return withCallDepth(h.depth, h.sh.WithAttrs(attrs))
+}
+
+func (h *callDepthHandler) WithGroup(name string) slog.Handler {
+	return withCallDepth(h.depth, h.sh.WithGroup(name))
+}
+
+func (h *callDepthHandler) Handle(ctx context.Context, r slog.Record) error {
+	// https://pkg.go.dev/log/slog#example-package-Wrapping
+	var pcs [1]uintptr
+	// skip Callers and this function
+	runtime.Callers(h.depth+2, pcs[:])
+	r.PC = pcs[0]
+
+	return h.sh.Handle(ctx, r)
+}