internal/logging: prototype slog logging

internal/logging/logging.go

@@ -0,0 +1,43 @@
+package logging
+
+import (
+	"context"
+	"io"
+	"log"
+	"log/slog"
+)
+
+// Logger returns an opinionated logger for the given level.
+func Logger(out io.Writer, level slog.Level) *slog.Logger {
+	return slog.New(textHandler(out, level))
+}
+
+func textHandler(out io.Writer, level slog.Level) slog.Handler {
+	return slog.NewTextHandler(out, &slog.HandlerOptions{
+		Level: level,
+	})
+}
+
+// TODO: need this?
+func textLogger(out io.Writer) *log.Logger {
+	return log.New(out, "", 0)
+}
+
+// DiscardLogger returns a [slog.Logger] that discards all output.
+func DiscardLogger() *slog.Logger {
+	return slog.New(DiscardHandler())
+}
+
+// DiscardHandler returns a [slog.Handler] that discards all output.
+// It is an implementation of https://github.com/golang/go/issues/62005.
+func DiscardHandler() slog.Handler {
+	return (*discardHandler)(nil)
+}
+
+type discardHandler struct {
+	slog.Handler
+}
+
+func (*discardHandler) Enabled(_ context.Context, _ slog.Level) bool {
+	return false
+}