Get rid of all global state mutation

[nimcoon.git] / clitube.nim

import
  htmlparser,
  httpClient,
  parseopt,
  osproc,
  sequtils,
  sugar,
  strformat,
  std/[terminal],
  strtabs,
  strutils,
  uri,
  xmltree

import preferences

type
  SearchResult = tuple[title: string, url: string]
  CommandLineOptions = tuple[searchQuery: string, musicOnly: bool, feelingLucky: bool]

proc selectMediaPlayer(): string =
  let availablePlayers = filterIt(supportedPlayers, execProcess("which " & it).len != 0)
  if len(availablePlayers) == 0:
    stderr.writeLine &"Please install one of the supported media players: {supportedPlayers}"
    raise newException(OSError, "No supported media player found")
  else:
    return availablePlayers[0]

proc parseOptions(): CommandLineOptions =
  var
    searchQuery = ""
    musicOnly = false
    feelingLucky = false

  for kind, key, value in getopt():
    case kind
    of cmdArgument:
      searchQuery = key
    of cmdShortOption, cmdLongOption:
      case key
      of "m", "music": musicOnly = true
      of "l", "lucky": feelingLucky = true
    of cmdEnd:
      discard

  return (searchQuery, musicOnly, feelingLucky)

proc getYoutubePage(searchQuery: string): string =
  let queryParam = encodeUrl(searchQuery)
  let client = newHttpClient()
  let response = get(client, &"https://www.youtube.com/results?hl=en&search_query={queryParam}")
  return $response.body

proc extractTitlesAndUrls(htmlFile: string): seq[SearchResult] =
  parseHtml(htmlFile).findAll("a").
    filter(a => "watch" in a.attrs["href"] and a.attrs.hasKey "title").
    map(a => (a.attrs["title"], "https://www.youtube.com" & a.attrs["href"]))[..(limit-1)]

proc presentVideoOptions(searchResults: seq[SearchResult]) =
  echo ""
  for index, (title, url) in searchResults:
    styledEcho $index, ". ", styleBright, fgMagenta, title, "\n", resetStyle, fgCyan, url, "\n"

proc directPlay(searchQuery: string, player: string) =
  styledEcho "\n", fgGreen, "Playing ", styleBright, fgMagenta, searchQuery
  if "watch?" in searchQuery or "videos/watch" in searchQuery :
    discard execProcess(&"{player} {searchQuery}")
    quit(0)
  elif searchQuery.startswith("magnet:"):
    discard execProcess(&"peerflix \"{searchQuery}\" --{player}")
    quit(0)

proc main() =
  let
    player = selectMediaPlayer()
    (searchQuery, musicOnly, feelingLucky) = parseOptions()

  directPlay(searchQuery, player)

  let searchResults = extractTitlesAndUrls(getYoutubePage(searchQuery))

  let number =
    if feelingLucky: 0
    else:
      presentVideoOptions(searchResults)
      stdout.styledWrite(fgYellow, "Choose video number: ")
      parseInt(readLine(stdin))

  styledEcho "\n", fgGreen, "Playing ", styleBright, fgMagenta, searchResults[number].title

  var command = @[player, searchResults[number].url]

  if musicOnly:
    command.add("--no-video")

  # Play the video using the preferred/available media player
  discard execProcess(command.join(" "))

main()