code.delx.au - bg-scripts/blob - bin/randombg.py

   1 #!/usr/bin/env python
   2
   3 VERSION = "2.0"
   4
   5
   6 import asyncore, asynchat, socket
   7 import os, os.path, random, sys, time
   8 from optparse import OptionParser
   9 import logging
  10 from logging import debug, info, warning, error, critical
  11 logging.basicConfig(format="%(levelname)s: %(message)s")
  12 try:
  13         import cPickle as pickle
  14 except ImportError:
  15         import pickle
  16
  17 try:
  18         # Required libraries
  19         import asyncsched
  20         import wallchanger
  21 except ImportError, e:
  22         critical("Missing libraries! Exiting...")
  23         sys.exit(1)
  24
  25
  26
  27
  28 def filter_images(filenames):
  29         extensions = ('.jpg', '.jpe', '.jpeg', '.png', '.gif', '.bmp')
  30         for filename in filenames:
  31                 _, ext = os.path.splitext(filename)
  32                 if ext.lower() in extensions:
  33                         yield filename
  34
  35 class BaseFileList(object):
  36         """Base file list implementation"""
  37         def scan_paths(self):
  38                 raise NotImplementedError()
  39
  40         def add_path(self, path):
  41                 raise NotImplementedError()
  42
  43         def store_cache(self, path):
  44                 pass
  45
  46         def load_cache(self, filename, rescanPaths = False):
  47                 pass
  48
  49         def get_next_image(self):
  50                 raise NotImplementedError()
  51
  52         def get_prev_image(self):
  53                 raise NotImplementedError()
  54
  55         def get_current_image(self):
  56                 raise NotImplementedError()
  57
  58         def is_empty(self):
  59                 return False
  60
  61
  62 class RandomFileList(BaseFileList):
  63         def __init__(self):
  64                 self.list = []
  65                 self.paths = []
  66                 self.last_image = None
  67
  68         def scan_paths(self):
  69                 for path in self.paths:
  70                         for dirpath, dirsnames, filenames in os.walk(path):
  71                                 for filename in filter_images(filenames):
  72                                         self.list.append(os.path.join(dirpath, filename))
  73
  74         def add_path(self, path):
  75                 self.paths.append(path)
  76                 debug('Added path "%s" to the list' % path)
  77
  78         def get_next_image(self):
  79                 n = random.randint(0, len(self.list)-1)
  80                 self.last_image = self.list[n]
  81                 debug("Picked file '%s' from list" % self.last_image)
  82                 return self.last_image
  83
  84         def is_empty(self):
  85                 return len(self.list) > 0
  86
  87
  88 class AllRandomFileList(BaseFileList):
  89         def __init__(self):
  90                 self.list = None
  91                 self.paths = []
  92                 self.imagePointer = 0
  93
  94         # Scan the input directory, and then randomize the file list
  95         def scan_paths(self):
  96                 debug("Scanning paths")
  97
  98                 self.list = []
  99                 for path in self.paths:
 100                         debug('Scanning "%s"' % path)
 101                         for dirpath, dirsnames, filenames in os.walk(path):
 102                                 for filename in filter_images(filenames):
 103                                         debug('Adding file "%s"' % filename)
 104                                         self.list.append(os.path.join(dirpath, filename))
 105
 106                 random.shuffle(self.list)
 107
 108         def add_path(self, path):
 109                 self.paths.append(path)
 110                 debug('Added path "%s" to the list' % path)
 111
 112         def store_cache(self, filename):
 113                 try:
 114                         fd = open(filename, 'wb')
 115                         pickle.dump(obj = self, file = fd, protocol = 2)
 116                         debug("Cache successfully stored")
 117                 except Exception, e:
 118                         warning("Exception while storing cache: '%s'" % e)
 119
 120         def load_cache(self, filename, rescanPaths = False):
 121                 debug('Attempting to load cache from "%s"' % filename)
 122                 self.paths.sort()
 123                 try:
 124                         fd = open(filename, 'rb')
 125                         tmp = pickle.load(fd)
 126                         if self.paths == tmp.paths:
 127                                 debug("Path lists match, copying properties")
 128                                 # Overwrite this object with the other
 129                                 for attr in ('list', 'imagePointer'):
 130                                         setattr(self, attr, getattr(tmp, attr))
 131                         else:
 132                                 debug("Ignoring cache, path lists do not match")
 133                 except Exception, e:
 134                         warning("Exception while loading cache: '%s'" % e)
 135
 136         def get_current_image(self):
 137                 return self.list[self.imagePointer]
 138
 139         def __inc_in_range(self, n, amount = 1, rangeMax = None, rangeMin = 0):
 140                 if rangeMax == None: rangeMax = len(self.list)
 141                 assert rangeMax > 0
 142                 return (n + amount) % rangeMax
 143
 144         def get_next_image(self):
 145                 self.imagePointer = self.__inc_in_range(self.imagePointer)
 146                 imageName = self.list[self.imagePointer]
 147                 debug("Picked file '%s' (pointer=%d) from list" % (imageName, self.imagePointer))
 148                 return imageName
 149
 150         def get_prev_image(self):
 151                 self.imagePointer = self.__inc_in_range(self.imagePointer, amount=-1)
 152                 imageName = self.list[self.imagePointer]
 153                 debug("Picked file '%s' (pointer=%d) from list" % (imageName, self.imagePointer))
 154                 return imageName
 155
 156         def is_empty(self):
 157                 return self.list
 158
 159 class FolderRandomFileList(BaseFileList):
 160         """A file list that will pick a file randomly within a directory. Each
 161         directory has the same chance of being chosen."""
 162         def __init__(self):
 163                 self.directories = {}
 164
 165         def scan_paths(self):
 166                 pass
 167
 168         def add_path(self, path):
 169                 debug('Added path "%s" to the list' % path)
 170                 for dirpath, dirs, filenames in os.walk(path):
 171                         debug('Scanning "%s" for images' % dirpath)
 172                         if self.directories.has_key(dirpath):
 173                                 continue
 174                         filenames = list(filter_images(filenames))
 175                         if len(filenames):
 176                                 self.directories[dirpath] = filenames
 177                                 debug('Adding "%s" to "%s"' % (filenames, dirpath))
 178                         else:
 179                                 debug("No images found in '%s'" % dirpath)
 180
 181         def get_next_image(self):
 182                 directory = random.choice(self.directories.keys())
 183                 debug('directory: "%s"' % directory)
 184                 filename = random.choice(self.directories[directory])
 185                 debug('filename: "%s"' % filename)
 186                 return os.path.join(directory, filename)
 187
 188         def is_empty(self):
 189                 return len(self.directories.values())
 190
 191
 192 class Cycler(object):
 193         def __init__(self, options, paths):
 194                 self.filelist = self.find_files(options, paths)
 195                 if not self.filelist.is_empty():
 196                         error("No images were found. Exiting...")
 197                         sys.exit(1)
 198
 199                 debug("Initialising wallchanger")
 200                 wallchanger.init(options.background_colour, options.permanent)
 201                 self.cycle_time = options.cycle_time
 202
 203                 self.task = None
 204                 self.cmd_next()
 205
 206         def find_files(self, options, paths):
 207                 if options.all_random:
 208                         filelist = AllRandomFileList()
 209                 elif options.folder_random:
 210                         filelist = FolderRandomFileList()
 211                 else:
 212                         filelist = RandomFileList()
 213
 214                 for path in paths:
 215                         filelist.add_path(path)
 216
 217                 if filelist.load_cache(options.history_filename):
 218                         debug("Loaded cache successfully")
 219                 else:
 220                         debug("Could not load cache")
 221                         filelist.scan_paths()
 222                 return filelist
 223
 224         def cmd_reset(self):
 225                 def next():
 226                         image = self.filelist.get_next_image()
 227                         wallchanger.set_image(image)
 228                         self.task = None
 229                         self.cmd_reset()
 230
 231                 if self.task is not None:
 232                         self.task.cancel()
 233                 self.task = asyncsched.schedule(self.cycle_time, next)
 234                 debug("Reset timer for %s seconds" % self.cycle_time)
 235
 236         def cmd_reload(self):
 237                 image = self.filelist.get_current_image()
 238                 wallchanger.set_image(image)
 239                 self.cmd_reset()
 240
 241         def cmd_next(self):
 242                 image = self.filelist.get_next_image()
 243                 wallchanger.set_image(image)
 244                 self.cmd_reset()
 245
 246         def cmd_prev(self):
 247                 image = self.filelist.get_prev_image()
 248                 wallchanger.set_image(image)
 249                 self.cmd_reset()
 250
 251         def cmd_rescan(self):
 252                 self.filelist.scan_paths()
 253                 self.cmd_next()
 254
 255         def cmd_pause(self):
 256                 if self.task is not None:
 257                         self.task.cancel()
 258                         self.task = None
 259
 260 class Server(asynchat.async_chat):
 261         def __init__(self, cycler, conn, addr):
 262                 asynchat.async_chat.__init__(self, conn=conn)
 263                 self.cycler = cycler
 264                 self.ibuffer = []
 265                 self.set_terminator("\n")
 266
 267         def collect_incoming_data(self, data):
 268                 self.ibuffer.append(data)
 269
 270         def found_terminator(self):
 271                 line = "".join(self.ibuffer).lower()
 272                 self.ibuffer = []
 273                 prefix, cmd = line.split(None, 1)
 274                 if prefix != "cmd":
 275                         debug('Bad line received "%s"' % line)
 276                         return
 277                 if hasattr(self.cycler, "cmd_" + cmd):
 278                         debug('Executing command "%s"' % cmd)
 279                         getattr(self.cycler, "cmd_" + cmd)()
 280                 else:
 281                         debug('Unknown command received "%s"' % cmd)
 282
 283
 284
 285 class Listener(asyncore.dispatcher):
 286         def __init__(self, socket_filename, cycler):
 287                 asyncore.dispatcher.__init__(self)
 288                 self.cycler = cycler
 289                 self.create_socket(socket.AF_UNIX, socket.SOCK_STREAM)
 290                 self.bind(socket_filename)
 291                 self.listen(2) # Backlog = 2
 292
 293         def handle_accept(self):
 294                 conn, addr = self.accept()
 295                 Server(self.cycler, conn, addr)
 296
 297
 298 def do_server(options, paths):
 299         try:
 300                 try:
 301                         cycler = Cycler(options, paths)
 302                         listener = Listener(options.socket_filename, cycler)
 303                         asyncsched.loop()
 304                 except KeyboardInterrupt:
 305                         print
 306         finally:
 307                 # Make sure that the socket is cleaned up
 308                 try:
 309                         os.unlink(options.socket_filename)
 310                 except:
 311                         pass
 312
 313 def do_client(options, args):
 314         if len(args) == 0:
 315                 args = ["next"]
 316         sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
 317         sock.connect(options.socket_filename)
 318         sock = sock.makefile()
 319         for i, cmd in enumerate(args):
 320                 sock.write("cmd %s\n" % cmd)
 321                 if i+1 != len(args):
 322                         time.sleep(options.cycle_time)
 323         sock.close()
 324
 325
 326 def build_parser():
 327         parser = OptionParser(version="%prog " + VERSION,
 328                 description = "Cycles through random background images.",
 329                 usage =
 330                         "\n(server) %prog [options] dir [dir2 ...]"
 331                         "\n(client) %prog [options] [next|prev|rescan|reload|pause] [...]"
 332                         "\nThe first instance to be run will be the server.\n"
 333                 )
 334         parser.add_option("-p", "--permanent",
 335                 action="store_true", dest="permanent", default=False,
 336                 help="Make the background permanent. Note: This will cause all machines logged in with this account to simultaneously change background [Default: %default]")
 337         parser.add_option("-v", '-d', "--verbose", "--debug",
 338                 action="count", dest="verbose", default=0,
 339                 help="Make the louder (good for debugging, or those who are curious)")
 340         parser.add_option("-b", "--background-colour",
 341                 action="store", type="string", dest="background_colour", default="black",
 342                 help="Change the default background colour that is displayed if the image is not in the correct aspect ratio [Default: %default]")
 343         parser.add_option("--all-random",
 344                 action="store_true", dest="all_random", default=False,
 345                 help="Make sure that all images have been displayed before repeating an image")
 346         parser.add_option("--folder-random",
 347                 action="store_true", dest="folder_random", default=False,
 348                 help="Give each folder an equal chance of having an image selected from it")
 349         parser.add_option("--cycle-time",
 350                 action="store", type="int", default=1800, dest="cycle_time",
 351                 help="Cause the image to cycle every X seconds")
 352         parser.add_option("--socket",
 353                 action="store", type="string", dest="socket_filename", default=os.path.expanduser('~/tmp/tmp_socket'),
 354                 help="Location of the command/control socket.")
 355         parser.add_option("--history-file",
 356                 action="store", type="string", dest="history_filename", default=os.path.expanduser('~/.randombg_historyfile'),
 357                 help="Stores the location of the last image to be loaded.")
 358         return parser
 359
 360 def main():
 361         parser = build_parser()
 362         options, args = parser.parse_args(sys.argv[1:])
 363
 364         if options.verbose == 1:
 365                 logging.getLogger().setLevel(logging.INFO)
 366         elif options.verbose >= 2:
 367                 logging.getLogger().setLevel(logging.DEBUG)
 368
 369         if os.path.exists(options.socket_filename):
 370                 do_client(options, args)
 371         else:
 372                 do_server(options, args)
 373
 374
 375 if __name__ == "__main__":
 376         main()
 377