X-Git-Url: https://git.phdru.name/?a=blobdiff_plain;f=xsetbg.py;h=706e183ef2cad8338877b5a6c59bfa04a419c2c5;hb=839045f02d15aa1ffb272eb60dff01a5a8f9bd69;hp=c57e56af2447a554a9936e6d5fd119f2d1eb3da4;hpb=c60f3eedbf9451dea7e6f505d8795d6da25164f7;p=xsetbg.git diff --git a/xsetbg.py b/xsetbg.py old mode 100755 new mode 100644 index c57e56a..706e183 --- a/xsetbg.py +++ b/xsetbg.py @@ -1,260 +1,147 @@ -#! /usr/bin/env python """Set a random background image (XWin) Select a random image from a (list of) directory(s) and set it as the desktop wallpaper (display it in the root window) -using xli or xsetbg programs. +using xli program. """ -__version__ = "$Revision$"[11:-2] -__revision__ = "$Id$"[5:-2] -__date__ = "$Date$"[7:-2] - -__author__ = "Oleg Broytman " -__copyright__ = "Copyright (C) 2000-2010 PhiloSoft Design" -__license__ = "GNU GPL" - - -import sys, os +from fcntl import flock, LOCK_EX, LOCK_UN, LOCK_NB +from datetime import timedelta +import os +import random +import re import subprocess +import sys +from time import time +from xsetbg_conf import xsetbg_dir, xsetbg_conf +from xsetbg_db import xsetbg_db -def error(error_str, error_code=1): - sys.stderr.write("%s: Error: %s\n" % (sys.argv[0], error_str)) - sys.exit(error_code) +__all__ = ['change'] -from ConfigParser import SafeConfigParser +def error(error_str): + sys.exit("%s: Error: %s\n" % (sys.argv[0], error_str)) -xsetbg_dir = os.path.dirname(os.path.abspath(__file__)) -os.chdir(xsetbg_dir) -config = SafeConfigParser() -config.read("xsetbg.conf") +if not xsetbg_db: + error("No database found. Run rescan_fs.py. Abort.") -if config.has_option("images", "directory") or \ - config.has_option("images", "directory0") or \ - config.has_option("images", "directory1"): - image_dirs = [] - if config.has_option("images", "directory"): - image_dirs.append(config.get("images", "directory")) - if config.has_option("images", "directory0"): - image_dirs.append(config.get("images", "directory0")) - if config.has_option("images", "directory1"): - image_dirs.append(config.get("images", "directory1")) - i = 2 - while True: - option = "directory%d" % i - if config.has_option("images", option): - image_dirs.append(config.get("images", option)) - i += 1 - else: - break -else: - image_dirs = ["images"] +if xsetbg_db.select().count() == 0: + error("No images found. Run rescan_fs.py. Abort.") -image_dirs = [os.path.join(xsetbg_dir, - os.path.expandvars(os.path.expanduser(dirname))) - for dirname in image_dirs -] # minimum time in seconds between background image changes -if config.has_option("xsetbg", "min_pause"): - min_pause = config.getint("xsetbg", "min_pause") +if xsetbg_conf.has_option("xsetbg", "min_pause"): + min_pause = xsetbg_conf.getint("xsetbg", "min_pause") else: - min_pause = 60 + min_pause = 60 -borders = config.get("xsetbg", "borders").split(',') -if config.has_option("xsetbg", "borders"): - borders = [border.strip() for border in config.get("xsetbg", "borders").split(',')] +borders = xsetbg_conf.get("xsetbg", "borders").split(',') +if xsetbg_conf.has_option("xsetbg", "borders"): + borders = [border.strip() for border in + xsetbg_conf.get("xsetbg", "borders").split(',')] else: - borders = ["darkcyan", "steelblue", "midnightblue"] + borders = ["darkcyan", "steelblue", "midnightblue"] # minimum time in seconds between occurences of the same image -if config.has_option("xsetbg", "min_delay"): - min_delay = config.getint("xsetbg", "min_delay") -else: - min_delay = 3600*24 # 24 hours - -# httpd settings -if config.has_option("httpd", "host"): - host = config.get("httpd", "host") -else: - host = 'localhost' +if xsetbg_conf.has_option("xsetbg", "min_delay"): + min_delay = xsetbg_conf.get("xsetbg", "min_delay") + + # Borrowed from http://stackoverflow.com/a/2765366 + td_re = re.compile('(?:(?P\d+)y)?' + '(?:(?P\d+)m)?' + '(?:(?P\d+)d)?' + '(?:T(?:(?P\d+)h)?' + '(?:(?P\d+)m)?(?:(?P\d+)s)?)?') + td_dict = td_re.match(min_delay).groupdict(0) + delta = timedelta(days=int(td_dict['days']) + + (int(td_dict['months']) * 30) + + (int(td_dict['years']) * 365), + hours=int(td_dict['hours']), + minutes=int(td_dict['minutes']), + seconds=int(td_dict['seconds'])) + + if delta: + min_delay = delta.days * 24*3600 + delta.seconds + else: + min_delay = int(min_delay) -if config.has_option("httpd", "port"): - port = config.getint("httpd", "port") else: - error("Config must specify a port to listen. Abort.") - -del config - - -os.umask(0066) # octal; -rw-------; make the global persistent dictionary - # readable only by the user -global_db_name = "xsetbg.db" - - -# DB keys -timestamp_key = "timestamp" -filename_key = "filename" -old_filename_key = "old_filename" - - -import random -import anydbm, shelve -from time import time -from fcntl import flock, LOCK_EX, LOCK_UN, LOCK_NB - -# Import pickle and all anydbm/shelve internal machinery, so that -# when ReadyExec forks they will be ready. -# Also create the database if it is not exists yet. - -try: - global_db = shelve.open(global_db_name, flag='c') -except anydbm.error, msg: - if str(msg) == "db type could not be determined": - os.remove(global_db_name) - global_db = shelve.open(global_db_name, flag='c') - -# Remove old filenames -old_time = time() - min_delay - -to_delete = [timestamp_key] -for key in global_db.keys(): - if key.startswith('/') and global_db[key] < old_time: - to_delete.append(key) - -for key in to_delete: - try: - del global_db[key] - except KeyError: - pass + min_delay = 3600*24 # 24 hours -global_db.close() # Close DB in the parent process +if xsetbg_db.select( + '(is_image = 1) AND (last_shown IS NULL OR last_shown < %d)' % + (time() - min_delay)).count() == 0: + error("No unshown images found. Run rescan_fs.py " + "or decrease min_delay. Abort.") -images = [] +fs_encoding = xsetbg_conf.get("images", "fs_encoding") -for image_dir in image_dirs: - # List images in all subdirectories - for dirpath, dirs, files in os.walk(image_dir): - images.extend([os.path.join(dirpath, file) for file in files]) -if not images: - error("No images found. Abort.") - - -def published(func): - func._wsgi_published = True - return func - -@published -def ping(force=False): - # Use the program's file as the lock file: - # lock it to prevent two processes run in parallel. - lock_file = open("xsetbg.py", 'r') - try: - flock(lock_file, LOCK_EX|LOCK_NB) - except IOError: # already locked - lock_file.close() - return - - - global_db = None - try: - # Reopen the global persistent dictionary - global_db = shelve.open(global_db_name, 'w') - - timestamp = global_db.get(timestamp_key) - current_time = time() - - if not force and timestamp is not None and \ - current_time - timestamp < min_pause: # Too early to change background - return - - # Save current time - global_db[timestamp_key] = current_time - - # Select a random image and check if we've seen it recently; - # loop until we can find a new image (never seen before) or old enough. - for i in xrange(len(images)): # ensure the loop is not infinite - image_name = random.choice(images) - if global_db.has_key(image_name): - image_time = global_db[image_name] - if current_time - image_time > min_delay: - break - else: - break - global_db[image_name] = current_time - - # Save filename - if global_db.has_key(filename_key): - global_db[old_filename_key] = global_db[filename_key] - global_db[filename_key] = image_name - - finally: - # Unlock and close the lock file - flock(lock_file, LOCK_UN) - lock_file.close() - # Flush and close the global persistent dictionary - if global_db: global_db.close() - - program_options = ["xli", "-onroot", "-quiet"] + \ - ["-center", "-border", random.choice(borders), "-zoom", "auto", - image_name] - - rc = subprocess.call(program_options) - if rc: - error("cannot execute xli!") - -@published -def force(): - ping(force=True) - -@published -def stop(): - QuitWSGIServer._quit_flag = True - - -from wsgiref.handlers import SimpleHandler -from wsgiref import simple_server -simple_server.ServerHandler = SimpleHandler # Stop logging to stdout -from wsgiref.simple_server import WSGIServer, make_server - -g = globals().copy() -commands = dict([(name, g[name]) for name in g - if getattr(g[name], '_wsgi_published', False)]) -del g - -class QuitWSGIServer(WSGIServer): - _quit_flag = False - - def serve_forever(self): - while not self._quit_flag: - self.handle_request() - -def app(env, start_response): - command = env['PATH_INFO'][1:] # Remove the leading slash - if command not in commands: - status = '404 Not found' - response_headers = [('Content-type', 'text/plain')] - start_response(status, response_headers) - return ['The command was not found.\n'] +def change(force=False): + # Use the program's file as the lock file: + # lock it to prevent two processes run in parallel. + lock_file = open(os.path.join(xsetbg_dir, 'xsetbg.py'), 'r') try: - commands[command]() - except: - status = '500 Error' - response_headers = [('Content-type', 'text/plain')] - start_response(status, response_headers) - return ['Error occured!\n'] + flock(lock_file, LOCK_EX | LOCK_NB) + except IOError: # already locked + lock_file.close() + return - status = '200 OK' - response_headers = [('Content-type', 'text/plain')] - start_response(status, response_headers) - return ['Ok\n'] + try: + timestamp = xsetbg_db.select( + '(is_image = 1) AND (last_shown IS NOT NULL)', + orderBy='-last_shown')[0].last_shown + current_time = time() + + if not force and timestamp is not None and \ + current_time - timestamp < min_pause: + # Too early to change background + return -httpd = make_server(host, port, app, server_class=QuitWSGIServer) -httpd.serve_forever() + # Select a random image that has never been shown + not_shown_select = xsetbg_db.select( + '(is_image = 1) AND (last_shown IS NULL)') + not_shown_count = not_shown_select.count() + if not_shown_count: + row = not_shown_select[random.randint(0, not_shown_count - 1)] + else: + old_shown_select = xsetbg_db.select( + '(is_image = 1) AND ' + '(last_shown IS NOT NULL AND last_shown < %d)' % + current_time - min_delay) + old_shown_count = old_shown_select.count() + if old_shown_count: + row = old_shown_select[random.randint(0, old_shown_count - 1)] + else: + error("No images to show found. Run rescan_fs.py " + "or decrease min_delay. Abort.") + + program_options = ["xli", "-border", random.choice(borders), + "-center", "-onroot", "-quiet", "-zoom", "auto", + row.full_name.encode(fs_encoding)] + + ext = os.path.splitext(row.full_name)[1].lower() + if ext in ('tif', 'tiff'): + program_options[0] = 'xsetbg' + + if ext == 'webp': + program_options = ['display', '-backdrop', + '-background', random.choice(borders), + '-window', 'root', + row.full_name.encode(fs_encoding)] + + rc = subprocess.call(program_options) + if rc: + error("cannot execute xli!") + else: + row.last_shown = current_time + + finally: + # Unlock and close the lock file + flock(lock_file, LOCK_UN) + lock_file.close()