server.coffee

   1 # SETTINGS
   2 term_lines = 34
   3 term_columns = 104
   4 http_port = 2218
   5
   6
   7 handler = (req, res) ->
   8         reply_err = (req, res, msg) ->
   9                 res.writeHead(200, 'Content-Type': 'text/plain')
  10                 return res.end("Error loading #{req.url} \"#{msg}\"")
  11         switch req.url
  12                 when '/', '/index.html'
  13                         filename = __dirname + '/index.html'
  14                         type = 'text/html'
  15                 when '/jquery.js'
  16                         filename = '/usr/share/javascript/jquery/jquery.min.js'
  17                         type = 'text/javascript'
  18                 when '/terminal.js'
  19                         filename = __dirname + '/terminal.coffee'
  20                         type = 'text/javascript'
  21                 when '/htmlterm.js'
  22                         filename = __dirname + '/htmlterm.coffee'
  23                         type = 'text/javascript'
  24                 when '/client.js'
  25                         filename = __dirname + '/client.coffee'
  26                         type = 'text/javascript'
  27                 else
  28                         return reply_err req, res
  29         fs.readFile filename, 'utf8', (err, data) ->
  30                 return reply_err req, res, err if err
  31
  32                 if filename.substr(filename.length - 7) is '.coffee'
  33                         try
  34                                 data = coffee.compile data
  35                         catch e
  36                                 return reply_err req, res, "server faild to compile #{filename}: #{JSON.stringify(e)}"
  37
  38                 res.writeHead(200, 'Content-Type': type)
  39                 res.end(data)
  40
  41 coffee = require 'coffee-script'
  42 app = require('http').createServer(handler)
  43 io = require('socket.io').listen(app)
  44 fs = require('fs')
  45 terminal = require('./terminal.coffee')
  46
  47 app.listen(http_port)
  48 term = terminal.new(term_columns, term_lines)
  49
  50 sockets = []
  51
  52 io.sockets.on 'connection', (socket) ->
  53         sockets.push socket
  54         socket.on 'disconnect', ->
  55                 for i in [i...sockets.length]
  56                         if sockets[i] is socket
  57                                 sockets.splice i, 1
  58                                 return
  59
  60
  61         enc_color = (prefix, c) ->
  62                 if c < 8
  63                         return "#{prefix}#{c}"
  64                 if c < 16
  65                         return "#{prefix + 6}#{c - 8}"
  66                 return "#{prefix}8;5;#{c}"
  67
  68         attr_diff = (a, b) ->
  69                 xo = a ^ b
  70                 parts = []
  71                 if (xo & 0xff)
  72                         parts.push enc_color 3, (b & 0xff)
  73                 if (xo & 0xff00)
  74                         parts.push enc_color 4, ((b & 0xff00) >> 8)
  75                 for [bit, code] in [[0x010000, '1'], [0x200000, '3'], [0x020000, '4'], [0x040000, '5'], [0x080000, '7'], [0x100000, '8']]
  76                         if (xo & bit)
  77                                 if (b & bit)
  78                                         parts.push code
  79                                 else
  80                                         parts.push '2' + code
  81                 if parts.length
  82                         return "\x1b[#{parts.join ';'}m"
  83                 else
  84                         return ''
  85         encode_screen = (height, width, text, attributes) ->
  86                 state = ''
  87                 for y in [0...height]
  88                         max = width - 1
  89                         while max >= 0 and text[y][max] is ' ' and (attributes[y][max] & 0x08ff00) is 0
  90                                 max -= 1
  91                         if max >= 0
  92                                 for x in [0..max]
  93                                         if attributes[y][x] isnt a
  94                                                 state += attr_diff a, attributes[y][x]
  95                                                 a = attributes[y][x]
  96                                         state += text[y][x]
  97                         if y < height - 1
  98                                 state += '\n'
  99                 return state
 100
 101         a = 0x07
 102         state = ''
 103         if term.saved_normal_screen?
 104                 state += encode_screen term.height, term.width, term.saved_normal_screen.text, term.saved_normal_screen.attributes
 105                 state += "\x1b[#{term.saved_normal_screen.y + 1};#{term.saved_normal_screen.x + 1}H"
 106                 state += "\x1b[?1049h\x1b[H" # flip to alt screen and move cursor home
 107         state += encode_screen term.height, term.width, term.text, term.attributes
 108         state += attr_diff a, term.a
 109         state += "\x1b[#{term.y + 1};#{term.x + 1}H"
 110         unless term.cursor_visible
 111                 state += "\x1b[?25l"
 112         unless term.scroll_top is 0 and term.scroll_bottom is term.height - 1
 113                 state += "\x1b[#{term.scroll_top};#{term.scroll_bottom}r"
 114         socket.emit 'init', width: term.width, height: term.height, text: state
 115
 116 process.stdin.resume()
 117 process.stdin.setEncoding 'utf8'
 118
 119 process.stdin.on 'data', (data) ->
 120         term.update data
 121         for s in sockets
 122                 s.emit 'data', data
 123
 124 process.stdin.on 'end', -> process.exit()