293 lines
9.2 KiB
Python
293 lines
9.2 KiB
Python
import json
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import logging
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import traceback
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import urwid
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from concurrent.futures import ThreadPoolExecutor
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from toot import api
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from .constants import PALETTE
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from .entities import Status
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from .timeline import Timeline
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logger = logging.getLogger(__name__)
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class Header(urwid.WidgetWrap):
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def __init__(self, app, user):
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self.app = app
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self.user = user
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self.text = urwid.Text("")
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self.cols = urwid.Columns([
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("pack", urwid.Text(('header_bold', 'toot'))),
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("pack", urwid.Text(('header', f' | {user.username}@{app.instance}'))),
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("pack", self.text),
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])
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widget = urwid.AttrMap(self.cols, 'header')
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widget = urwid.Padding(widget)
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self._wrapped_widget = widget
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def clear_text(self, text):
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self.text.set_text("")
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def set_text(self, text):
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self.text.set_text(" | " + text)
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class Footer(urwid.Pile):
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def __init__(self):
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self.status = urwid.Text("")
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self.message = urwid.Text("")
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return super().__init__([
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urwid.AttrMap(self.status, "footer_status"),
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urwid.AttrMap(self.message, "footer_message"),
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])
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def set_status(self, text):
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self.status.set_text(text)
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def clear_status(self, text):
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self.status.set_text("")
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def set_message(self, text):
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self.message.set_text(text)
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def set_error_message(self, text):
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self.message.set_text(("footer_message_error", text))
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def clear_message(self):
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self.message.set_text("")
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class TUI(urwid.Frame):
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"""Main TUI frame."""
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@classmethod
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def create(cls, app, user):
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"""Factory method, sets up TUI and an event loop."""
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tui = cls(app, user)
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loop = urwid.MainLoop(
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tui,
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palette=PALETTE,
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event_loop=urwid.AsyncioEventLoop(),
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unhandled_input=tui.unhandled_input,
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)
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tui.loop = loop
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return tui
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def __init__(self, app, user):
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self.app = app
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self.user = user
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self.loop = None # set in `create`
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self.executor = ThreadPoolExecutor(max_workers=1)
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self.timeline_generator = api.home_timeline_generator(app, user, limit=40)
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# self.timeline_generator = api.public_timeline_generator(app.instance, local=False, limit=40)
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self.body = urwid.Filler(urwid.Text("Loading toots...", align="center"))
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self.header = Header(app, user)
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self.footer = Footer()
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self.footer.set_status("Loading...")
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self.timeline = None
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self.overlay = None
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self.exception = None
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super().__init__(self.body, header=self.header, footer=self.footer)
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def run(self):
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self.loop.set_alarm_in(0, lambda *args: self.async_load_statuses(is_initial=True))
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self.loop.run()
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self.executor.shutdown(wait=False)
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def run_in_thread(self, fn, args=[], kwargs={}, done_callback=None, error_callback=None):
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"""Runs `fn(*args, **kwargs)` asynchronously in a separate thread.
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On completion calls `done_callback` if `fn` exited cleanly, or
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`error_callback` if an exception was caught. Callback methods are
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invoked in the main thread, not the thread in which `fn` is executed.
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"""
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def _default_error_callback(ex):
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self.exception = ex
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self.footer.set_error_message("An exeption occured, press E to view")
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_error_callback = error_callback or _default_error_callback
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def _done(future):
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try:
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result = future.result()
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if done_callback:
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# Use alarm to invoke callback in main thread
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self.loop.set_alarm_in(0, lambda *args: done_callback(result))
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except Exception as ex:
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exception = ex
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logger.exception(exception)
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self.loop.set_alarm_in(0, lambda *args: _error_callback(exception))
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future = self.executor.submit(fn, *args, **kwargs)
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future.add_done_callback(_done)
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def build_timeline(self, statuses):
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timeline = Timeline(self, statuses)
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urwid.connect_signal(timeline, "status_focused",
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lambda _, args: self.status_focused(*args))
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urwid.connect_signal(timeline, "next",
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lambda *args: self.async_load_statuses(is_initial=False))
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return timeline
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def async_load_statuses(self, is_initial):
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"""Asynchronously load a list of statuses."""
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def _load_statuses():
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self.footer.set_message("Loading statuses...")
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try:
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data = next(self.timeline_generator)
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except StopIteration:
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return []
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finally:
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self.footer.clear_message()
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return [Status(s, self.app.instance) for s in data]
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def _done_initial(statuses):
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"""Process initial batch of statuses, construct a Timeline."""
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self.timeline = self.build_timeline(statuses)
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self.timeline.status_focused() # Draw first status
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self.body = self.timeline
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def _done_next(statuses):
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"""Process sequential batch of statuses, adds statuses to the
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existing timeline."""
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self.timeline.add_statuses(statuses)
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self.run_in_thread(_load_statuses,
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done_callback=_done_initial if is_initial else _done_next)
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def status_focused(self, status, index, count):
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self.footer.set_status([
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("footer_status_bold", "[home] "), status.id,
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" - status ", str(index + 1), " of ", str(count),
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])
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def show_status_source(self, status):
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self.open_overlay(
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widget=StatusSource(status),
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title="Status source",
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options={
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"align": 'center',
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"width": ('relative', 80),
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"valign": 'middle',
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"height": ('relative', 80),
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},
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)
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def show_exception(self, exception):
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self.open_overlay(
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widget=ExceptionStackTrace(exception),
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title="Unhandled Exception",
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options={
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"align": 'center',
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"width": ('relative', 80),
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"valign": 'middle',
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"height": ('relative', 80),
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},
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)
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def async_toggle_favourite(self, status):
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def _favourite():
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logger.info("Favouriting {}".format(status))
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api.favourite(self.app, self.user, status.id)
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def _unfavourite():
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logger.info("Unfavouriting {}".format(status))
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api.unfavourite(self.app, self.user, status.id)
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def _done(loop):
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# Create a new Status with flipped favourited flag
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new_data = status.data
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new_data["favourited"] = not status.favourited
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self.timeline.update_status(Status(new_data, status.instance))
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self.run_in_thread(
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_unfavourite if status.favourited else _favourite,
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done_callback=_done
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)
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def async_toggle_reblog(self, status):
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def _reblog():
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logger.info("Reblogging {}".format(status))
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api.reblog(self.app, self.user, status.id)
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def _unreblog():
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logger.info("Unreblogging {}".format(status))
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api.unreblog(self.app, self.user, status.id)
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def _done(loop):
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# Create a new Status with flipped reblogged flag
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new_data = status.data
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new_data["reblogged"] = not status.reblogged
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self.timeline.update_status(Status(new_data, status.instance))
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self.run_in_thread(
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_unreblog if status.reblogged else _reblog,
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done_callback=_done
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)
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# --- Overlay handling -----------------------------------------------------
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def open_overlay(self, widget, options={}, title=""):
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top_widget = urwid.LineBox(widget, title=title)
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bottom_widget = self.body
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self.overlay = urwid.Overlay(
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top_widget,
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bottom_widget,
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**options
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)
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self.body = self.overlay
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def close_overlay(self):
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self.body = self.overlay.bottom_w
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self.overlay = None
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# --- Keys -----------------------------------------------------------------
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def unhandled_input(self, key):
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if key in ('e', 'E'):
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if self.exception:
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self.show_exception(self.exception)
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if key in ('q', 'Q'):
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if self.overlay:
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self.close_overlay()
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else:
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raise urwid.ExitMainLoop()
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class StatusSource(urwid.ListBox):
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"""Shows status data, as returned by the server, as formatted JSON."""
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def __init__(self, status):
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source = json.dumps(status.data, indent=4)
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lines = source.splitlines()
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walker = urwid.SimpleFocusListWalker([
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urwid.Text(line) for line in lines
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])
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super().__init__(walker)
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class ExceptionStackTrace(urwid.ListBox):
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"""Shows an exception stack trace."""
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def __init__(self, ex):
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lines = traceback.format_exception(etype=type(ex), value=ex, tb=ex.__traceback__) * 3
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walker = urwid.SimpleFocusListWalker([
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urwid.Text(line) for line in lines
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])
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super().__init__(walker)
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