How do my logs only include "filename:line" when `AddSource` option is true in Go's slog library

In Go's slog HandlerOptions, the AddSource option can show the /full/path/filename:line. It's too long!

What's the simplest way to let it only show filename:line, or relative-path-to-project/filename:line like zap logger? Thanks

type HandlerOptions struct {
// AddSource causes the handler to compute the source code position
// of the log statement and add a SourceKey attribute to the output.
AddSource bool

https://pkg.go.dev/log/slog#HandlerOptions

You can add to options user-defined filter for attributes and in case of source use filepath.Base to cut the path. You shoud also add import "path/filepath" to use it.

type HandlerOptions struct {
    AddSource bool,
    ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
        if a.Key == slog.SourceKey {
            a.Value := filepath.Base(a.Value)
        }
        return a
    }
}

https://pkg.go.dev/log/slog#HandlerOptions (see example below)