422 lines
14 KiB
Python
422 lines
14 KiB
Python
#!/usr/bin/env python
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# Safe Eyes is a utility to remind you to take break frequently
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# to protect your eyes from eye strain.
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# Copyright (C) 2017 Gobinath
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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This module contains the entity classes used by Safe Eyes and its plugins.
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"""
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import logging
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import random
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from enum import Enum
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from packaging.version import parse
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from safeeyes import utility
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class Break:
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"""
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An entity class which represents a break.
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"""
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def __init__(self, break_type, name, time, duration, image, plugins):
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self.type = break_type
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self.name = name
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self.duration = duration
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self.image = image
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self.plugins = plugins
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self.time = time
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self.next = None
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def __str__(self):
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return 'Break: {{name: "{}", type: {}, duration: {}}}\n'.format(self.name, self.type, self.duration)
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def __repr__(self):
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return str(self)
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def is_long_break(self):
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"""
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Check whether this break is a long break.
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"""
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return self.type == BreakType.LONG_BREAK
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def is_short_break(self):
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"""
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Check whether this break is a short break.
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"""
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return self.type == BreakType.SHORT_BREAK
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def plugin_enabled(self, plugin_id, is_plugin_enabled):
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"""
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Check whether this break supports the given plugin.
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"""
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if self.plugins:
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return plugin_id in self.plugins
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else:
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return is_plugin_enabled
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class BreakType(Enum):
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"""
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Type of Safe Eyes breaks.
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"""
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SHORT_BREAK = 1
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LONG_BREAK = 2
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class BreakQueue:
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def __init__(self, config, context):
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self.context = context
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self.__current_break = None
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self.__current_long = 0
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self.__current_short = 0
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self.__short_break_time = config.get('short_break_interval')
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self.__long_break_time = config.get('long_break_interval')
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self.__is_random_order = config.get('random_order')
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self.__config = config
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self.__build_longs()
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self.__build_shorts()
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# Interface guarantees that short_interval >= 1
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# And that long_interval is a multiple of short_interval
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short_interval = config.get('short_break_interval')
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long_interval = config.get('long_break_interval')
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self.__cycle_len = int(long_interval / short_interval)
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# To count every long break as a cycle in .next() if there are no short breaks
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if self.__short_queue is None:
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self.__cycle_len = 1
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# Restore the last break from session
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if not self.is_empty():
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last_break = context['session'].get('break')
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if last_break is not None:
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current_break = self.get_break()
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if last_break != current_break.name:
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brk = self.next()
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while brk != current_break and brk.name != last_break:
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brk = self.next()
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def get_break(self, break_type = None):
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if self.__current_break is None:
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self.__current_break = self.next()
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if break_type is None or self.__current_break.type == break_type:
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return self.__current_break
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if break_type == BreakType.LONG_BREAK:
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if self.__long_queue is None:
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return None;
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return self.__long_queue[self.__current_long]
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if self.__short_queue is None:
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return None;
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return self.__short_queue[self.__current_short]
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def is_long_break(self):
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return self.__current_break is not None and self.__current_break.type == BreakType.LONG_BREAK
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def next(self, break_type = None):
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break_obj = None
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shorts = self.__short_queue
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longs = self.__long_queue
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# Reset break that has just ended
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if self.is_long_break():
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self.__current_break.time = self.__long_break_time
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if self.__current_long == 0 and self.__is_random_order:
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# Shuffle queue
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self.__build_longs()
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elif self.__current_break:
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# Reduce the break time from the next long break (default)
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if longs:
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longs[self.__current_long].time -= shorts[self.__current_short].time
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if self.__current_short == 0 and self.__is_random_order:
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self.__build_shorts()
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if self.is_empty():
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return None
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if shorts is None:
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break_obj = self.__next_long()
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elif longs is None:
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break_obj = self.__next_short()
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elif break_type == BreakType.LONG_BREAK or longs[self.__current_long].time <= shorts[self.__current_short].time:
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break_obj = self.__next_long()
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else:
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break_obj = self.__next_short()
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self.__current_break = break_obj
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self.context['session']['break'] = self.__current_break.name
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return break_obj
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def reset(self):
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for break_object in self.__short_queue:
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break_object.time = self.__short_break_time
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for break_object in self.__long_queue:
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break_object.time = self.__long_break_time
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def is_empty(self, break_type = None):
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"""
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Check if the given break type is empty or not. If the break_type is None, check for both short and long breaks.
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"""
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if break_type == BreakType.SHORT_BREAK:
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return self.__short_queue is None
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elif break_type == BreakType.LONG_BREAK:
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return self.__long_queue is None
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else:
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return self.__short_queue is None and self.__long_queue is None
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def __next_short(self):
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longs = self.__long_queue
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shorts = self.__short_queue
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break_obj = shorts[self.__current_short]
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self.context['break_type'] = 'short'
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# Update the index to next
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self.__current_short = (self.__current_short + 1) % len(shorts)
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return break_obj
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def __next_long(self):
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longs = self.__long_queue
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break_obj = longs[self.__current_long]
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self.context['break_type'] = 'long'
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# Update the index to next
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self.__current_long = (self.__current_long + 1) % len(longs)
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return break_obj
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def __build_queue(self, break_type, break_configs, break_time, break_duration):
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"""
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Build a queue of breaks.
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"""
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size = len(break_configs)
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if 0 == size:
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# No breaks
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return None
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if self.__is_random_order:
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breaks_order = random.sample(break_configs, size)
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else:
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breaks_order = break_configs
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queue = [None] * size
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for i, break_config in enumerate(breaks_order):
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name = _(break_config['name'])
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duration = break_config.get('duration', break_duration)
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image = break_config.get('image')
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plugins = break_config.get('plugins', None)
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interval = break_config.get('interval', break_time)
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# Validate time value
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if not isinstance(duration, int) or duration <= 0:
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logging.error('Invalid break duration in: ' +
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str(break_config))
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continue
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break_obj = Break(break_type, name, interval,
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duration, image, plugins)
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queue[i] = break_obj
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return queue
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def __build_shorts(self):
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self.__short_queue = self.__build_queue(BreakType.SHORT_BREAK,
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self.__config.get('short_breaks'),
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self.__short_break_time,
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self.__config.get('short_break_duration'))
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def __build_longs(self):
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self.__long_queue = self.__build_queue(BreakType.LONG_BREAK,
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self.__config.get('long_breaks'),
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self.__long_break_time,
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self.__config.get('long_break_duration'))
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class State(Enum):
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"""
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Possible states of Safe Eyes.
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"""
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START = 0, # Starting scheduler
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WAITING = 1, # User is working (waiting for next break)
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PRE_BREAK = 2, # Preparing for break
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BREAK = 3, # Break
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STOPPED = 4, # Disabled
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QUIT = 5, # Quitting
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RESTING = 6 # Resting (natural break)
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class EventHook:
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"""
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Hook to attach and detach listeners to system events.
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"""
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def __init__(self):
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self.__handlers = []
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def __iadd__(self, handler):
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self.__handlers.append(handler)
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return self
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def __isub__(self, handler):
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self.__handlers.remove(handler)
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return self
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def fire(self, *args, **keywargs):
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"""
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Fire all listeners attached with.
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"""
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for handler in self.__handlers:
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if not handler(*args, **keywargs):
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return False
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return True
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class Config:
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"""
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The configuration of Safe Eyes.
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"""
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def __init__(self, init=True):
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# Read the config files
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self.__user_config = utility.load_json(utility.CONFIG_FILE_PATH)
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self.__system_config = utility.load_json(
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utility.SYSTEM_CONFIG_FILE_PATH)
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# If there any breaking changes in long_breaks, short_breaks or any other keys, use the __force_upgrade list
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self.__force_upgrade = []
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# self.__force_upgrade = ['long_breaks', 'short_breaks']
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if init:
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# if create_startup_entry finds a broken autostart symlink, it will repair it
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utility.create_startup_entry(force=False)
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if self.__user_config is None:
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utility.initialize_safeeyes()
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self.__user_config = self.__system_config
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self.save()
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else:
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system_config_version = self.__system_config['meta']['config_version']
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meta_obj = self.__user_config.get('meta', None)
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if meta_obj is None:
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# Corrupted user config
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self.__user_config = self.__system_config
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else:
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user_config_version = str(
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meta_obj.get('config_version', '0.0.0'))
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if parse(user_config_version) != parse(system_config_version):
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# Update the user config
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self.__merge_dictionary(
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self.__user_config, self.__system_config)
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self.__user_config = self.__system_config
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# Update the style sheet
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utility.replace_style_sheet()
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utility.merge_plugins(self.__user_config)
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self.save()
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def __merge_dictionary(self, old_dict, new_dict):
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"""
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Merge the dictionaries.
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"""
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for key in new_dict:
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if key == "meta" or key in self.__force_upgrade:
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continue
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if key in old_dict:
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new_value = new_dict[key]
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old_value = old_dict[key]
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if type(new_value) is type(old_value):
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# Both properties have same type
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if isinstance(new_value, dict):
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self.__merge_dictionary(old_value, new_value)
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else:
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new_dict[key] = old_value
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def clone(self):
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config = Config(init=False)
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return config
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def save(self):
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"""
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Save the configuration to file.
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"""
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utility.write_json(utility.CONFIG_FILE_PATH, self.__user_config)
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def get(self, key, default_value=None):
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"""
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Get the value.
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"""
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value = self.__user_config.get(key, default_value)
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if value is None:
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value = self.__system_config.get(key, None)
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return value
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def set(self, key, value):
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"""
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Set the value.
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"""
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self.__user_config[key] = value
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def __eq__(self, config):
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return self.__user_config == config.__user_config
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def __ne__(self, config):
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return self.__user_config != config.__user_config
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class TrayAction:
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"""
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Data object wrapping name, icon and action.
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"""
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def __init__(self, name, icon, action, system_icon):
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self.name = name
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self.__icon = icon
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self.action = action
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self.system_icon = system_icon
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self.__toolbar_buttons = []
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def get_icon(self):
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if self.system_icon:
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return self.__icon
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else:
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image = utility.load_and_scale_image(self.__icon, 16, 16)
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image.show()
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return image
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def add_toolbar_button(self, button):
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self.__toolbar_buttons.append(button)
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def reset(self):
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for button in self.__toolbar_buttons:
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button.hide()
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self.__toolbar_buttons.clear()
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@classmethod
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def build(cls, name, icon_path, icon_id, action):
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image = utility.load_and_scale_image(icon_path, 12, 12)
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if image is None:
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return TrayAction(name, icon_id, action, True)
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else:
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return TrayAction(name, icon_path, action, False)
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