src/lib.nim

   1 import
   2   htmlparser,
   3   httpClient,
   4   os,
   5   osproc,
   6   sequtils,
   7   sugar,
   8   strformat,
   9   std/[terminal],
  10   strformat,
  11   strtabs,
  12   strutils,
  13   tables,
  14   uri,
  15   xmltree
  16
  17 import config
  18
  19 type
  20   Options* = Table[string, bool]
  21   SearchResult* = tuple[title: string, url: string]
  22   SearchResults* = seq[tuple[title: string, url: string]]
  23   CommandLineOptions* = tuple[searchQuery: string, options: Options]
  24   SelectionRange* = tuple[begin: int, until: int]
  25
  26 # poEchoCmd can be added to options for debugging
  27 let processOptions = {poStdErrToStdOut, poUsePath}
  28
  29 proc selectMediaPlayer*(): string =
  30   let availablePlayers = filterIt(supportedPlayers, execProcess("which " & it).len != 0)
  31   if len(availablePlayers) == 0:
  32     stderr.writeLine &"Please install one of the supported media players: {supportedPlayers}"
  33     raise newException(OSError, "No supported media player found")
  34   else:
  35     return availablePlayers[0]
  36
  37 proc getYoutubePage*(searchQuery: string): string =
  38   let queryParam = encodeUrl(searchQuery)
  39   let client = newHttpClient()
  40   let response = get(client, &"https://www.youtube.com/results?hl=en&search_query={queryParam}")
  41   return $response.body
  42
  43 func extractTitlesAndUrls*(html: string): SearchResults =
  44   {.noSideEffect.}:
  45     parseHtml(html).findAll("a").
  46       filter(a => "watch" in a.attrs["href"] and a.attrs.hasKey "title").
  47       map(a => (a.attrs["title"], "https://www.youtube.com" & a.attrs["href"]))
  48
  49 proc presentVideoOptions*(searchResults: SearchResults) =
  50   eraseScreen()
  51   for index, (title, url) in searchResults:
  52     styledEcho $index, ". ", styleBright, fgMagenta, title, "\n", resetStyle, fgCyan, url, "\n"
  53
  54 proc play*(player: string, args: openArray[string], title: string) =
  55   styledEcho "\n", fgGreen, "Playing ", styleBright, fgMagenta, title
  56   if "--no-video" in args:
  57     discard execShellCmd(&"{player} {args.join(\" \")}")
  58   else:
  59     discard execProcess(player, args=args, options=processOptions)
  60
  61 func buildMusicDownloadArgs*(url: string): seq[string] =
  62   {.noSideEffect.}:
  63     var args = @["--ignore-errors", "-f", "bestaudio", "--extract-audio", "--audio-format", "mp3", "--audio-quality", "0", "-o"]
  64     let downloadLocation = &"'{expandTilde(musicDownloadDirectory)}/%(title)s.%(ext)s'"
  65     args.add(downloadLocation)
  66     args.add(url)
  67     return args
  68
  69 func buildVideoDownloadArgs*(url: string): seq[string] =
  70   {.noSideEffect.}:
  71     var args = @["-f", "best", "-o"]
  72     let downloadLocation = &"'{expandTilde(videoDownloadDirectory)}/%(title)s.%(ext)s'"
  73     args.add(downloadLocation)
  74     args.add(url)
  75     return args
  76
  77 proc download*(args: openArray[string], title: string) =
  78   styledEcho "\n", fgGreen, "Downloading ", styleBright, fgMagenta, title
  79   discard execShellCmd(&"youtube-dl {args.join(\" \")}")
  80
  81 func urlLongen(url: string): string =
  82   url.replace("youtu.be/", "www.youtube.com/watch?v=")
  83
  84 func stripZshEscaping(url: string): string =
  85   url.replace("\\", "")
  86
  87 func sanitizeURL*(url: string): string =
  88   urlLongen(stripZshEscaping(url))
  89
  90 proc directPlay*(url: string, player: string, musicOnly: bool) =
  91   if url.startswith("magnet:"):
  92     if musicOnly:
  93       discard execShellCmd(&"peerflix '{url}' -a --{player} -- --no-video")
  94     else:
  95       discard execProcess("peerflix", args=[url, &"--{player}"], options=processOptions)
  96   else:
  97     if musicOnly:
  98       discard execShellCmd(&"{player} --no-video {url}")
  99     else:
 100       discard execProcess(player, args=[url], options=processOptions)
 101
 102 proc directDownload*(url: string, musicOnly: bool) =
 103   let args =
 104     if musicOnly: buildMusicDownloadArgs(url)
 105     else: buildVideoDownloadArgs(url)
 106   discard execShellCmd(&"youtube-dl {args.join(\" \")}")
 107
 108 proc offerSelection(searchResults: SearchResults, options: Table[string, bool], selectionRange: SelectionRange): string =
 109   if options["feelingLucky"]: "0"
 110   else:
 111     presentVideoOptions(searchResults[selectionRange.begin .. selectionRange.until])
 112     stdout.styledWrite(fgYellow, "Choose video number: ")
 113     readLine(stdin)
 114
 115 # This is a pure function with no side effects
 116 func buildPlayerArgs(searchResult: SearchResult, options: Table[string, bool]): seq[string] =
 117   var args = @[searchResult.url]
 118   if options["musicOnly"]: args.add("--no-video")
 119   if options["fullScreen"]: args.add("--fullscreen")
 120   return args
 121
 122 proc handleUserInput(searchResult: SearchResult, options: Table[string, bool], player: string) =
 123   if options["download"]:
 124     if options["musicOnly"]:
 125       download(buildMusicDownloadArgs(searchResult.url), searchResult.title)
 126     else:
 127       download(buildVideoDownloadArgs(searchResult.url), searchResult.title)
 128   else:
 129     play(player, buildPlayerArgs(searchResult, options), searchResult.title)
 130
 131 proc present*(searchResults: SearchResults, options: Table[string, bool], selectionRange: SelectionRange, player: string) =
 132   #[ Continuously present options till the user quits the application
 133        selectionRange: Currently available range to choose from depending on pagination
 134   ]#
 135
 136   let userInput = offerSelection(searchResults, options, selectionRange)
 137
 138   case userInput
 139   of "all":
 140     for selection in selectionRange.begin .. selectionRange.until:
 141       handleUserInput(searchResults[selection], options, player)
 142     quit(0)
 143   of "n":
 144     if selectionRange.until + 1 < len(searchResults):
 145       let newSelectionRange = (selectionRange.until + 1, min(len(searchResults) - 1, selectionRange.until + limit))
 146       present(searchResults, options, newSelectionRange, player)
 147   of "p":
 148     if selectionRange.begin > 0:
 149       let newSelectionRange = (selectionRange.begin - limit, selectionRange.until - limit)
 150       present(searchResults, options, newSelectionRange, player)
 151   of "q":
 152     quit(0)
 153   else:
 154     handleUserInput(searchResults[parseInt(userInput)], options, player)
 155     if options["feelingLucky"]:
 156       quit(0)
 157     else:
 158       present(searchResults, options, selectionRange, player)