Video thumbnail generation

render.go

@@ -36,6 +36,9 @@ type entry struct {
 	// ThumbURL is set for thumbnailable files; the thumbnail view renders an
 	// <img> when it is non-empty and falls back to Icon otherwise.
 	ThumbURL string
+	// IsVideo marks a thumbnail tile as a video so the grid can overlay a play
+	// badge. Only meaningful when ThumbURL is set.
+	IsVideo bool
 	// modTime/size carry the raw sort keys; the template only reads the
 	// formatted Meta string.
 	modTime time.Time
@@ -217,6 +220,7 @@ func listEntries(fsPath, urlPath, sortKey, order string) []entry {
 			}
 			if hasThumbnail(name) {
 				f.ThumbURL = thumbURL(path.Join(urlPath, url.PathEscape(name)), 300)
+				f.IsVideo = isVideoFile(name)
 			}
 			files = append(files, f)
 		}