filter: flip added, which reverts the line order

cmd/subber/subber.go

@@ -21,7 +21,7 @@ var (
 	keepAds     = kingpin.Flag("keep-ads", "Do not strip advertisement captions.").Bool()
 	skipBackups = kingpin.Flag("skip-backups", "Do not make backup (.srt.org) of original .srt").Bool()
 	language    = kingpin.Flag("language", "Language.").Default("en").String()
-	filterName  = kingpin.Flag("filter", "Filter (none, caps, html, ocr, all).").Default("none").String()
+	filterName  = kingpin.Flag("filter", "Filter (none, caps, html, ocr, flip, all).").Default("none").String()
 	sync        = kingpin.Flag("sync", "Synchronize captions (milliseconds).").Int()
 )
 

filter.go

@@ -17,6 +17,8 @@ func (subtitle *Subtitle) FilterCaptions(filter string) {
 		subtitle.filterHTML()
 	case "ocr":
 		subtitle.filterOCR()
+	case "flip":
+		subtitle.filterFlip()
 	case "none":
 	default:
 		fmt.Printf("Unrecognized filter name: %s\n", filter)

filter_flip.go

@@ -0,0 +1,13 @@
+package subtitles
+
+// filterFlip reverts the line order of each caption
+func (subtitle *Subtitle) filterFlip() *Subtitle {
+	for i, cap := range subtitle.Captions {
+		flipped := []string{}
+		for _, line := range cap.Text {
+			flipped = append([]string{line}, flipped...)
+		}
+		subtitle.Captions[i].Text = flipped
+	}
+	return subtitle
+}

filter_flip_test.go

@@ -0,0 +1,23 @@
+package subtitles
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFilterFlip(t *testing.T) {
+	in := Subtitle{Captions: []Caption{{
+		Seq:   1,
+		Start: makeTime(0, 0, 4, 630),
+		End:   makeTime(0, 0, 6, 18),
+		Text:  []string{"Line one", "Line two"},
+	}}}
+	expected := Subtitle{[]Caption{{
+		1,
+		makeTime(0, 0, 4, 630),
+		makeTime(0, 0, 6, 18),
+		[]string{"Line two", "Line one"},
+	}}}
+	assert.Equal(t, &expected, in.filterFlip())
+}