Open multi-file torrents as playlists

src/renderer/lib/playlist.js

@@ -0,0 +1,78 @@
+var TorrentPlayer = require('./torrent-player')
+
+module.exports = Playlist
+
+function Playlist (torrentSummary) {
+  this._infoHash = torrentSummary.infoHash
+  this._position = 0
+  this._tracks = extractTracks(torrentSummary)
+}
+
+Playlist.prototype.getInfoHash = function () {
+  return this._infoHash
+}
+
+Playlist.prototype.getTracks = function () {
+  return this._tracks
+}
+
+Playlist.prototype.hasNext = function () {
+  return this._position + 1 < this._tracks.length
+}
+
+Playlist.prototype.hasPrevious = function () {
+  return this._position > 0
+}
+
+Playlist.prototype.next = function () {
+  if (this.hasNext()) {
+    this._position++
+    return this.getCurrent()
+  }
+}
+
+Playlist.prototype.previous = function () {
+  if (this.hasPrevious()) {
+    this._position--
+    return this.getCurrent()
+  }
+}
+
+Playlist.prototype.jumpToFile = function (infoHash, fileIndex) {
+  this.setPosition(this._tracks.findIndex(
+    (track) => track.infoHash === infoHash && track.fileIndex === fileIndex
+  ))
+  return this.getCurrent()
+}
+
+Playlist.prototype.getCurrent = function () {
+  var position = this.getPosition()
+  return position === undefined ? undefined : this._tracks[position]
+}
+
+Playlist.prototype.getPosition = function () {
+  if (this._position >= 0 && this._position < this._tracks.length) {
+    return this._position
+  } else return undefined
+}
+
+Playlist.prototype.setPosition = function (position) {
+  this._position = position
+}
+
+function extractTracks (torrentSummary) {
+  return torrentSummary.files.map((file, index) => ({ file, index }))
+    .filter((object) => TorrentPlayer.isPlayable(object.file))
+    .sort(function (a, b) {
+      if (a.file.name < b.file.name) return -1
+      if (b.file.name < a.file.name) return 1
+      return 0
+    })
+    .map((object) => ({
+      infoHash: torrentSummary.infoHash,
+      fileIndex: object.index,
+      type: TorrentPlayer.isVideo(object.file) ? 'video'
+          : TorrentPlayer.isAudio(object.file) ? 'audio'
+          : 'other'
+    }))
+}