SafeEyes/safeeyes/model.py

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#!/usr/bin/env python
# Safe Eyes is a utility to remind you to take break frequently
# to protect your eyes from eye strain.
# Copyright (C) 2017 Gobinath
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
This module contains the entity classes used by Safe Eyes and its plugins.
"""
from distutils.version import LooseVersion
from enum import Enum
from safeeyes import Utility
class Break(object):
"""
An entity class which represents a break.
"""
def __init__(self, break_type, name, time, image, plugins):
self.type = break_type
self.name = name
self.time = time
self.image = image
self.plugins = plugins
def __str__(self):
return 'Break: {{name: "{}", type: {}, time: {}}}\n'.format(self.name, self.type, self.time)
def __repr__(self):
return str(self)
def is_long_break(self):
"""
Check whether this break is a long break.
"""
return self.type == BreakType.LONG_BREAK
def is_short_break(self):
"""
Check whether this break is a short break.
"""
return self.type == BreakType.SHORT_BREAK
def plugin_enabled(self, plugin_id, is_plugin_enabled):
"""
Check whether this break supports the given plugin.
"""
if self.plugins:
return plugin_id in self.plugins
else:
return is_plugin_enabled
class BreakType(Enum):
"""
Type of Safe Eyes breaks.
"""
SHORT_BREAK = 1
LONG_BREAK = 2
class State(Enum):
"""
Possible states of Safe Eyes.
"""
START = 0,
WAITING = 1,
PRE_BREAK = 2,
BREAK = 3,
STOPPED = 4,
QUIT = 5
class EventHook(object):
"""
Hook to attach and detach listeners to system events.
"""
def __init__(self):
self.__handlers = []
def __iadd__(self, handler):
self.__handlers.append(handler)
return self
def __isub__(self, handler):
self.__handlers.remove(handler)
return self
def fire(self, *args, **keywargs):
"""
Fire all listeners attached with.
"""
for handler in self.__handlers:
if not handler(*args, **keywargs):
return False
return True
class Config(object):
"""
The configuration of Safe Eyes.
"""
def __init__(self):
# Read the config files
self.__user_config = Utility.load_json(Utility.CONFIG_FILE_PATH)
self.__system_config = Utility.load_json(Utility.SYSTEM_CONFIG_FILE_PATH)
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self.__force_upgrade = ['long_breaks', 'short_breaks']
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if self.__user_config is None:
Utility.initialize_safeeyes()
self.__user_config = self.__system_config
self.save()
else:
system_config_version = self.__system_config['meta']['config_version']
meta_obj = self.__user_config.get('meta', None)
if meta_obj is None:
# Corrupted user config
self.__user_config = self.__system_config
else:
user_config_version = str(meta_obj.get('config_version', '0.0.0'))
if LooseVersion(user_config_version) != LooseVersion(system_config_version):
# Update the user config
self.__merge_dictionary(self.__user_config, self.__system_config)
self.__user_config = self.__system_config
Utility.merge_plugins(self.__user_config)
self.save()
def __merge_dictionary(self, old_dict, new_dict):
"""
Merge the dictionaries.
"""
for key in new_dict:
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if key == "meta" or key in self.__force_upgrade:
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continue
if key in old_dict:
new_value = new_dict[key]
old_value = old_dict[key]
if type(new_value) is type(old_value):
# Both properties have same type
if isinstance(new_value, dict):
self.__merge_dictionary(old_value, new_value)
else:
new_dict[key] = old_value
def save(self):
"""
Save the configuration to file.
"""
Utility.write_json(Utility.CONFIG_FILE_PATH, self.__user_config)
def get(self, key, default_value=None):
"""
Get the value.
"""
value = self.__user_config.get(key, default_value)
if value is None:
value = self.__system_config.get(key, None)
return value
def set(self, key, value):
"""
Set the value.
"""
self.__user_config[key] = value