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# Copyright (C) 2009, 2010, 2011 Rickard Lindberg, Roger Lindberg
#
# This file is part of Timeline.
#
# Timeline 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.
#
# Timeline 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 Timeline. If not, see <http://www.gnu.org/licenses/>.
"""
Implementation of timeline database that reads and writes (todo) ICS files.
"""
import re
import codecs
import shutil
import os.path
from os.path import abspath
from datetime import date
from datetime import datetime
from datetime import timedelta
from icalendar import Calendar
from timelinelib.db.interface import STATE_CHANGE_ANY
from timelinelib.db.interface import STATE_CHANGE_CATEGORY
from timelinelib.db.interface import TimelineDB
from timelinelib.db.interface import TimelineIOError
from timelinelib.db.objects import Category
from timelinelib.db.objects import Event
from timelinelib.db.objects import TimePeriod
from timelinelib.db.objects import time_period_center
from timelinelib.db.utils import generic_event_search
from timelinelib.db.utils import IdCounter
from timelinelib.db.utils import safe_write
from timelinelib.meta.version import get_version
from timelinelib.time import PyTimeType
from timelinelib.utils import ex_msg
class IcsTimeline(TimelineDB):
def __init__(self, path):
TimelineDB.__init__(self, path)
self.event_id_counter = IdCounter()
self._load_data()
def get_time_type(self):
return PyTimeType()
def is_read_only(self):
return True
def supported_event_data(self):
return []
def search(self, search_string):
return generic_event_search(self._get_events(), search_string)
def get_events(self, time_period):
def decider(event):
return event.inside_period(time_period)
return self._get_events(decider)
def get_all_events(self):
def decider(event):
return True
return self._get_events(decider)
def get_first_event(self):
events = self._get_events()
if events:
return min(events, key=lambda x: x.time_period.start_time)
else:
return None
def get_last_event(self):
events = self._get_events()
if events:
return max(events, key=lambda x: x.time_period.end_time)
else:
return None
def save_event(self, event):
pass
def delete_event(self, event_or_id):
pass
def get_categories(self):
return []
def save_category(self, category):
pass
def delete_category(self, category_or_id):
pass
def load_view_properties(self, view_properties):
pass
def save_view_properties(self, view_properties):
pass
def find_event_with_id(self, id):
events = self._get_events()
for e in events:
if e.id == id:
return e
return None
def _get_events(self, decider_fn=None):
events = []
for event in self.cal.walk("VEVENT"):
start, end = extract_start_end(event)
txt = ""
if event.has_key("summary"):
txt = event["summary"]
e = Event(self.get_time_type(), start, end, txt)
e.set_id(event["timeline_id"])
if decider_fn is None or decider_fn(e):
events.append(e)
return events
def _load_data(self):
self.cal = Calendar()
if not os.path.exists(self.path):
# Nothing to load. Will create a new timeline on save.
return
try:
file = open(self.path, "rb")
try:
file_contents = file.read()
try:
self.cal = Calendar.from_string(file_contents)
for event in self.cal.walk("VEVENT"):
event["timeline_id"] = self.event_id_counter.get_next()
except Exception, pe:
msg1 = _("Unable to read timeline data from '%s'.")
msg2 = "\n\n" + ex_msg(pe)
raise TimelineIOError((msg1 % abspath(self.path)) + msg2)
finally:
file.close()
except IOError, e:
msg = _("Unable to read from file '%s'.")
whole_msg = (msg + "\n\n%s") % (abspath(self.path), e)
raise TimelineIOError(whole_msg)
def _save_data(self):
#def save(file):
# file.write(self.cal.as_string())
#safe_write(self.path, None, save)
pass
def extract_start_end(vevent):
"""Return (start_time, end_time)."""
start = ensure_datetime(vevent.decoded("dtstart"))
if vevent.has_key("dtend"):
end = ensure_datetime(vevent.decoded("dtend"))
elif vevent.has_key("duration"):
end = start + vevent.decoded("duration")
else:
end = ensure_datetime(vevent.decoded("dtstart"))
return (start, end)
def ensure_datetime(d):
if isinstance(d, datetime):
return datetime(d.year, d.month, d.day, d.hour, d.minute, d.second)
elif isinstance(d, date):
return datetime(d.year, d.month, d.day)
else:
raise TimelineIOError("Unknown date.")
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