chore: add Apache License 2.0 and ignore build directory

src/output/terminal/terminal.go

@@ -0,0 +1,54 @@
+// Package terminal renders captions using terminal control sequences.
+package terminal
+
+import (
+	"fmt"
+	"io"
+
+	"tea.chunkbyte.com/kato/captioneer/src/captions"
+)
+
+type Sink struct {
+	writer         io.Writer
+	previewVisible bool
+}
+
+func New(writer io.Writer) *Sink {
+	return &Sink{writer: writer}
+}
+
+func (s *Sink) Publish(event captions.Event) error {
+	switch event.Kind {
+	case captions.Provisional:
+		_, err := fmt.Fprintf(s.writer, "\r\033[2K… %s", event.Text)
+		if err == nil {
+			s.previewVisible = true
+		}
+		return err
+	case captions.Final:
+		if err := s.clearPreview(); err != nil {
+			return err
+		}
+		_, err := fmt.Fprintf(s.writer, "[%.2fs-%.2fs] %s\n", event.StartedAt.Seconds(), event.EndedAt.Seconds(), event.Text)
+		return err
+	case captions.Hide:
+		return s.clearPreview()
+	default:
+		return fmt.Errorf("unsupported caption event kind %d", event.Kind)
+	}
+}
+
+func (s *Sink) Close() error {
+	return s.clearPreview()
+}
+
+func (s *Sink) clearPreview() error {
+	if !s.previewVisible {
+		return nil
+	}
+	_, err := fmt.Fprint(s.writer, "\r\033[2K")
+	if err == nil {
+		s.previewVisible = false
+	}
+	return err
+}