# .tlv file generated by https://github.com/akkartik/teliva
# You may edit it if you are careful; however, you may see cryptic errors if you
# violate Teliva's assumptions.
#
# .tlv files are representations of Teliva programs. Teliva programs consist of
# sequences of definitions. Each definition is a table of key/value pairs. Keys
# and values are both strings.
#
# Lines in .tlv files always follow exactly one of the following forms:
# - comment lines at the top of the file starting with '#' at column 0
# - beginnings of definitions starting with '- ' at column 0, followed by a
#   key/value pair
# - key/value pairs consisting of '  ' at column 0, containing either a
#   spaceless value on the same line, or a multi-line value
# - multiline values indented by more than 2 spaces, starting with a '>'
#
# If these constraints are violated, Teliva may unceremoniously crash. Please
# report bugs at http://akkartik.name/contact
- __teliva_timestamp: original
  check:
    >function check(x, msg)
    >  if x then
    >    Window:addch('.')
    >  else
    >    print('F - '..msg)
    >    print('  '..str(x)..' is false/nil')
    >    teliva_num_test_failures = teliva_num_test_failures + 1
    >    -- overlay first test failure on editors
    >    if teliva_first_failure == nil then
    >      teliva_first_failure = msg
    >    end
    >  end
    >end
- __teliva_timestamp: original
  check_eq:
    >function check_eq(x, expected, msg)
    >  if eq(x, expected) then
    >    Window:addch('.')
    >  else
    >    print('F - '..msg)
    >    print('  expected '..str(expected)..' but got '..str(x))
    >    teliva_num_test_failures = teliva_num_test_failures + 1
    >    -- overlay first test failure on editors
    >    if teliva_first_failure == nil then
    >      teliva_first_failure = msg
    >    end
    >  end
    >end
- __teliva_timestamp: original
  eq:
    >function eq(a, b)
    >  if type(a) ~= type(b) then return false end
    >  if type(a) == 'table' then
    >    if #a ~= #b then return false end
    >    for k, v in pairs(a) do
    >      if b[k] ~= v then
    >        return false
    >      end
    >    end
    >    for k, v in pairs(b) do
    >      if a[k] ~= v then
    >        return false
    >      end
    >    end
    >    return true
    >  end
    >  return a == b
    >end
- __teliva_timestamp: original
  str:
    >-- smarter tostring
    >-- slow; used only for debugging
    >function str(x)
    >  if type(x) == 'table' then
    >    local result = ''
    >    result = result..#x..'{'
    >    for k, v in pairs(x) do
    >      result = result..str(k)..'='..str(v)..', '
    >    end
    >    result = result..'}'
    >    return result
    >  elseif type(x) == 'string' then
    >    return '"'..x..'"'
    >  end
    >  return tostring(x)
    >end
- __teliva_timestamp: original
  Window:
    >Window = curses.stdscr()
    >-- animation-based app
    >Window:nodelay(true)
    >lines, cols = Window:getmaxyx()
- __teliva_timestamp: original
  current_game:
    >current_game = {}
- __teliva_timestamp: original
  piece_glyph:
    >piece_glyph = {
    >  -- for legibility, white pieces also use unicode glyphs for black pieces
    >  -- we rely on colors to distinguish them
    >  K = 0x265a,
    >  Q = 0x265b,
    >  R = 0x265c,
    >  B = 0x265d,
    >  N = 0x265e,
    >  P = 0x265f,
    >  k = 0x265a,
    >  q = 0x265b,
    >  r = 0x265c,
    >  b = 0x265d,
    >  n = 0x265e,
    >  p = 0x265f,
    >}
- __teliva_timestamp: original
  top_player:
    >function top_player(current_game)
    >  if current_game.players[1].color == "black" then
    >    return current_game.players[1]
    >  end
    >  return current_game.players[2]
    >end
- __teliva_timestamp: original
  bottom_player:
    >function bottom_player(current_game)
    >  if current_game.players[1].color == "white" then
    >    return current_game.players[1]
    >  end
    >  return current_game.players[2]
    >end
- __teliva_timestamp: original
  render_player:
    >function render_player(y, x, player)
    >  Window:mvaddstr(y, x, player.user.name)
    >  Window:addstr(" · ")
    >  Window:addstr(tostring(player.rating))
    >end
- __teliva_timestamp: original
  render_square:
    >function render_square(current_game, rank, file, highlighted_squares)
    >  -- decide whether to highlight
    >  local hl = 0
    >  if (rank == highlighted_squares.from.rank and file == highlighted_squares.from.file)
    >      or (rank == highlighted_squares.to.rank and file == highlighted_squares.to.file) then
    >    hl = 4
    >  end
    >  if (rank+file)%2 == 1 then
    >    -- light square
    >    Window:attrset(curses.color_pair(1+hl))
    >  else
    >    -- dark square
    >    Window:attrset(curses.color_pair(3+hl))
    >  end
    >  Window:mvaddstr((8 - rank + 1)*3,   file*5, "     ")
    >  Window:mvaddstr((8 - rank + 1)*3+1, file*5, "     ")
    >  Window:mvaddstr((8 - rank + 1)*3+2, file*5, "     ")
    >  Window:attrset(curses.A_NORMAL)
    >end
- __teliva_timestamp: original
  render_fen_rank:
    >function render_fen_rank(rank, fen_rank, highlighted_squares)
    >  local file = 1
    >  for x in fen_rank:gmatch(".") do
    >    if x:match("%d") then
    >      file = file + tonumber(x)
    >    else
    >      -- decide whether to highlight
    >      local hl = 0
    >      if (rank == highlighted_squares.from.rank and file == highlighted_squares.from.file)
    >          or (rank == highlighted_squares.to.rank and file == highlighted_squares.to.file) then
    >        hl = 4
    >      end
    >      if (rank+file)%2 == 1 then
    >        if x < 'Z' then
    >          -- white piece on light square
    >          Window:attrset(curses.color_pair(1+hl))
    >        else
    >          -- black piece on light square
    >          Window:attrset(curses.color_pair(2+hl))
    >        end
    >      else
    >        if x < 'Z' then
    >          -- white piece on dark square
    >          Window:attrset(curses.color_pair(3+hl))
    >        else
    >          -- black piece on dark square
    >          Window:attrset(curses.color_pair(4+hl))
    >        end
    >      end
    >      Window:mvaddstr((8 - rank + 1)*3+1, file*5+2, utf8(piece_glyph[x]))
    >      Window:attrset(curses.A_NORMAL)
    >      file = file + 1
    >    end
    >  end
    >end
- __teliva_timestamp: original
  render_time:
    >function render_time(y, x, seconds)
    >  if seconds == nil then return end
    >  Window:mvaddstr(y, x, tostring(math.floor(seconds/60)))
    >  Window:addstr(string.format(":%02d", seconds%60))
    >end
- __teliva_timestamp: original
  render_board:
    >function render_board(current_game)
    >--?   Window:mvaddstr(1, 50, dump(current_game.fen))
    >--?   Window:mvaddstr(6, 50, dump(current_game.previously_moved_squares))
    >  render_player(2, 5, top_player(current_game))
    >  render_time(2, 35, current_game.bc)
    >  for rank=8,1,-1 do
    >    for file=1,8 do
    >      render_square(current_game, rank, file, current_game.previously_moved_squares)
    >    end
    >    render_fen_rank(rank, current_game.fen_rank[8-rank+1], current_game.previously_moved_squares)
    >  end
    >  render_player(27, 5, bottom_player(current_game))
    >  render_time(27, 35, current_game.wc)
    >end
- __teliva_timestamp: original
  parse_lm:
    >function parse_lm(move)
    >--?   Window:mvaddstr(4, 50, move)
    >  local file1 = string.byte(move:sub(1, 1)) - 96  -- 'a'-1
    >  local rank1 = string.byte(move:sub(2, 2)) - 48  -- '0'
    >  local file2 = string.byte(move:sub(3, 3)) - 96  -- 'a'-1
    >  local rank2 = string.byte(move:sub(4, 4)) - 48  -- '0'
    >--?   Window:mvaddstr(5, 50, dump({{rank1, file1}, {rank2, file2}}))
    >  return {from={rank=rank1, file=file1}, to={rank=rank2, file=file2}}
    >end
- __teliva_timestamp: original
  render:
    >function render(chunk)
    >  local o = json.decode(chunk)
    >  if o.t == "featured" then
    >    current_game = o.d
    >--?     current_game.lm = "__"
    >    current_game.previously_moved_squares = {from={rank=0, file=0}, to={rank=0, file=0}}  -- no highlight
    >  else
    >    current_game.fen = o.d.fen
    >    current_game.wc = o.d.wc
    >    current_game.bc = o.d.bc
    >--?     current_game.lm = o.d.lm
    >    current_game.previously_moved_squares = parse_lm(o.d.lm)
    >--?     Window:nodelay(false)
    >--?     Window:mvaddstr(3, 50, "paused")
    >  end
    >  current_game.fen_rank = split(current_game.fen, "%w+")
    >  render_board(current_game)
    >  Window:refresh()
    >end
- __teliva_timestamp: original
  init_colors:
    >function init_colors()
    >  -- colors
    >  local light_piece = 1
    >  local dark_piece = 0
    >  local light_square = 252
    >  local dark_square = 242
    >  local light_last_moved_square = 229
    >  local dark_last_moved_square = 226
    >  -- initialize colors
    >  curses.init_pair(1, light_piece, light_square)
    >  curses.init_pair(2, dark_piece, light_square)
    >  curses.init_pair(3, light_piece, dark_square)
    >  curses.init_pair(4, dark_piece, dark_square)
    >  curses.init_pair(5, light_piece, light_last_moved_square)
    >  curses.init_pair(6, dark_piece, light_last_moved_square)
    >  curses.init_pair(7, light_piece, dark_last_moved_square)
    >  curses.init_pair(8, dark_piece, dark_last_moved_square)
    >end
- __teliva_timestamp: original
  main:
    >function main()
    >  init_colors()
    >  local request = {
    >    url = "https://lichess.org/api/tv/feed",
    >    sink = function(chunk, err)
    >             if chunk then
    >               Window:clear()
    >               render(chunk)
    >               Window:getch()
    >             end
    >             return 1
    >           end,
    >  }
    >  http.request(request)
    >end
- __teliva_timestamp: original
  utf8:
    >-- https://stackoverflow.com/questions/7983574/how-to-write-a-unicode-symbol-in-lua
    >function utf8(decimal)
    >  local bytemarkers = { {0x7FF,192}, {0xFFFF,224}, {0x1FFFFF,240} }
    >  if decimal<128 then return string.char(decimal) end
    >  local charbytes = {}
    >  for bytes,vals in ipairs(bytemarkers) do
    >    if decimal<=vals[1] then
    >      for b=bytes+1,2,-1 do
    >        local mod = decimal%64
    >        decimal = (decimal-mod)/64
    >        charbytes[b] = string.char(128+mod)
    >      end
    >      charbytes[1] = string.char(vals[2]+decimal)
    >      break
    >    end
    >  end
    >  return table.concat(charbytes)
    >end
- __teliva_timestamp: original
  split:
    >function split(s, pat)
    >  result = {}
    >  for x in s:gmatch(pat) do
    >    table.insert(result, x)
    >  end
    >  return result
    >end
- __teliva_timestamp: original
  dump:
    >-- https://stackoverflow.com/questions/9168058/how-to-dump-a-table-to-console
    >function dump(o)
    >  if type(o) == 'table' then
    >    local s = '{ '
    >    for k,v in pairs(o) do
    >      if type(k) ~= 'number' then k = '"'..k..'"' end
    >      s = s .. '['..k..'] = ' .. dump(v) .. ','
    >    end
    >    return s .. '} '
    >  else
    >    return tostring(o)
    >  end
    >end
- __teliva_timestamp:
    >Sat Feb 12 18:57:02 2022
  __teliva_note:
    >better UX when app isn't permitted to access the network
  main:
    >function main()
    >  init_colors()
    >  local request = {
    >    url = "https://lichess.org/api/tv/feed",
    >    sink = function(chunk, err)
    >             if chunk then
    >               Window:clear()
    >               -- main event loop is here
    >               render(chunk)
    >               Window:getch()
    >             end
    >             return 1
    >           end,
    >  }
    >  http.request(request)
    >  -- degenerate event loop just to show errors in sandboxing, etc.
    >  while true do Window:getch(); end
    >end
- __teliva_timestamp:
    >Thu Feb 17 20:00:23 2022
  doc:blurb:
    >A demo of Teliva's support for networking: watch the current live chess game from Lichess TV.
    >
    >Compare with https://lichess.org/tv on a browser.