melrōse musical expression player

package system import ( "flag" "fmt" "io" "os" "path/filepath" "sync" "github.com/emicklei/melrose/core" "github.com/emicklei/melrose/midi" "github.com/emicklei/melrose/midi/transport" "github.com/emicklei/melrose/notify" "github.com/emicklei/melrose/dsl" ) var ( debugLogging = flag.Bool("d", false, "debug logging") errLogLocation = flag.String("log", "", "log file location") ) func Setup(buildTag string) (core.Context, error) { core.BuildTag = buildTag flag.Parse() if *errLogLocation != "" { err := os.MkdirAll(filepath.Dir(*errLogLocation), os.ModeDir) if err != nil { notify.Errorf("failed to create log directory %s: %v", *errLogLocation, err) return nil, err } errOut, err := os.OpenFile(*errLogLocation, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644) if err == nil { notify.Console.StandardError = io.MultiWriter(errOut, os.Stderr) } else { notify.Errorf("failed to open error log file %s: %v", *errLogLocation, err) return nil, err } } if *debugLogging { notify.ToggleDebug() } transport.Initializer() ctx := new(core.PlayContext) ctx.EnvironmentVars = new(sync.Map) ctx.VariableStorage = dsl.NewVariableStore() ctx.LoopControl = core.NewBeatmaster(ctx, 120) ctx.CapabilityFlags = core.NewCapabilities() reg, err := midi.NewDeviceRegistry() if err != nil { return nil, fmt.Errorf("unable to initialize MIDI: %w", err) } ctx.AudioDevice = reg return ctx, nil }