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# Copyright (C) 2011-2018 Patrick Totzke <patricktotzke@gmail.com>
# This file is released under the GNU GPL, version 3 or a later revision.
# For further details see the COPYING file
import asyncio
from functools import partial
import urwid
from .buffer import Buffer
from ..db.errors import QueryError
from ..db.sort import NAME as SORT_NAME
from ..settings.const import settings
from ..widgets.search import ThreadlineWidget
class IterWalker(urwid.ListWalker):
"""
urwid.ListWalker that reads next items from a generator and wraps them in
ThreadlineWidget widgets for displaying
"""
_threads = None
_wgt_factory = None
_reverse = None
_iter_done = False
# list of the thread IDs
_tids = None
# a dictionary of threadline widgets, indexed by position
_wgts = None
_focus = None
def __init__(self, threads, wgt_factory, reverse):
self._threads = threads
self._wgt_factory = wgt_factory
self._reverse = reverse
self._tids = []
self._wgts = {}
self._focus = 0
super().__init__()
def __len__(self):
while not self._iter_done:
self._get_next_item()
return len(self._tids)
def _map_pos(self, pos):
if self._reverse:
pos = len(self) - 1 - pos
return pos
def __getitem__(self, pos):
self._check_pos(pos)
if not pos in self._wgts:
# make sure an exception while constructing the widget does not get
# swallowed by urwid
try:
self._wgts[pos] = self._wgt_factory(self._tids[self._map_pos(pos)])
except (KeyError, IndexError, TypeError) as e:
raise ValueError('Exception while constructing threadline widget') from e
return self._wgts[pos]
def _check_pos(self, pos):
tgt_pos = self._map_pos(pos)
if tgt_pos < 0:
raise IndexError
while not self._iter_done and tgt_pos >= len(self._tids):
self._get_next_item()
if tgt_pos >= len(self._tids):
raise IndexError
return pos
def next_position(self, pos):
return self._check_pos(pos + 1)
def prev_position(self, pos):
return self._check_pos(pos - 1)
@property
def focus(self):
return self._focus
def set_focus(self, pos):
self._check_pos(pos)
self._focus = pos
self._modified()
def _get_next_item(self):
if self._iter_done:
return None
try:
self._tids.append(next(self._threads))
except StopIteration:
self._iter_done = True
class SearchBuffer(Buffer):
"""shows a result list of threads for a query"""
modename = 'search'
sort_order = None
reverse = None
_message_count = None
_thread_count = None
def __init__(self, ui, initialquery='', sort_order=None, reverse = False):
self.dbman = ui.dbman
self.ui = ui
self.querystring = initialquery
default_order = SORT_NAME[settings.get('search_threads_sort_order')]
self.sort_order = sort_order or default_order
self.reverse = reverse
self.rebuild()
super().__init__()
def __str__(self):
ret = '[search] for "%s"' % self.querystring
if self._thread_count is not None:
threadstr = ' in %d thread%s' % (self._thread_count, '' if self._thread_count == 1 else 's')
else:
threadstr = ''
if self._message_count is not None:
ret += ' (%d message%s%s)' % (self._message_count, '' if self._message_count == 1 else 's',
threadstr)
return ret
async def _calc_result_count(self):
"""
Asynchronously compute message/thread counts.
Cache and return them.
"""
# instance variables can get reset if rebuild() gets called
# while we are waiting, hence this code
message_count = self._message_count
thread_count = self._thread_count
if message_count is None or thread_count is None:
tasks = [self.ui._loop.run_in_executor(None, f, self.querystring)
for f in (self.dbman.count_messages, self.dbman.count_threads)]
message_count, thread_count = await asyncio.gather(*tasks)
self._message_count = message_count
self._thread_count = thread_count
return message_count, thread_count
async def get_info(self):
message_count, thread_count = await self._calc_result_count()
info = {}
info['querystring'] = self.querystring
info['result_count'] = message_count
info['thread_count'] = thread_count
info['result_count_positive'] = 's' if info['result_count'] > 1 else ''
return info
def rebuild(self):
exclude_tags = settings.get_notmuch_setting('search', 'exclude_tags')
if exclude_tags:
exclude_tags = frozenset([t for t in exclude_tags.split(';') if t])
else:
exclude_tags = frozenset()
self._result_count = None
self._thread_count = None
threads = self.dbman.get_threads(self.querystring, self.sort_order,
exclude_tags)
wgt_factory = partial(ThreadlineWidget, dbman = self.dbman,
query = self.querystring)
threadlist = IterWalker(threads, wgt_factory, self.reverse)
# check that the query is well-formed
try:
threadlist[0]
except IndexError:
# empty result list, no problem
pass
except QueryError:
self.ui.notify('malformed query string: %s' % self.querystring,
'error')
threadlist = []
self.threadlist = threadlist
self.listbox = urwid.ListBox(self.threadlist)
self.body = self.listbox
def get_selected_threadline(self):
"""
returns curently focussed :class:`alot.widgets.ThreadlineWidget`
from the result list.
"""
return self.threadlist[self.threadlist.focus]
def get_selected_thread(self):
"""returns currently selected :class:`~alot.db.Thread`"""
threadlinewidget = self.get_selected_threadline()
thread = None
if threadlinewidget:
thread = threadlinewidget.get_thread()
return thread
def focus_first(self):
self.body.set_focus(0)
def focus_last(self):
self.body.set_focus(len(self.threadlist) - 1)
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