server.coffee

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