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Current File : /usr/lib/python3/dist-packages/reportbug/ui/gtk_ui.py
# a graphical (GTK+) user interface
#   Written by Luca Bruno <lethalman88@gmail.com>
#   Based on gnome-reportbug work done by Philipp Kern <pkern@debian.org>
#   Copyright (C) 2006 Philipp Kern
#   Copyright (C) 2008-2009 Luca Bruno
#
# This program is freely distributable per the following license:
#
#  Permission to use, copy, modify, and distribute this software and its
#  documentation for any purpose and without fee is hereby granted,
#  provided that the above copyright notice appears in all copies and that
#  both that copyright notice and this permission notice appear in
#  supporting documentation.
#
#  I DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL I
#  BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
#  DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
#  WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
#  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
#  SOFTWARE.

from reportbug.exceptions import UINotImportable

import os
if not ('DISPLAY' in os.environ or 'WAYLAND_DISPLAY' in os.environ):
    raise UINotImportable('No graphical display detected, falling back to text UI.')

try:
    import gi

    gi.require_version('GLib', '2.0')
    from gi.repository import GLib

    gi.require_version('GObject', '2.0')
    from gi.repository import GObject

    gi.require_version('Pango', '1.0')
    from gi.repository import Pango

    gi.require_version('Gdk', '3.0')
    from gi.repository import Gdk

    gi.require_version('GdkPixbuf', '2.0')
    from gi.repository import GdkPixbuf

    gi.require_version('Gtk', '3.0')
    from gi.repository import Gtk

    gi.require_version('GtkSource', '3.0')
    from gi.repository import GtkSource

    gi.require_foreign('cairo')
except ImportError:
    raise UINotImportable('Please install the reportbug-gtk package to use this interface.')

global Vte

gtkspellcheck = None

import sys
import re
import traceback
from queue import Queue
import threading
import textwrap

from reportbug.exceptions import NoPackage, NoBugs, QuertBTSError
from reportbug import debbugs
from reportbug.urlutils import launch_browser

ISATTY = True
DEBIAN_LOGO = "/usr/share/pixmaps/debian-logo.png"

global application, assistant, report_message, reportbug_context, ui_context

# Utilities


def _describe_context(context):
    if context == ui_context:
        return '<MainContext of UI thread>'
    elif context == reportbug_context:
        return '<MainContext of reportbug thread>'
    else:
        return repr(context)


def _assert_context(expected):
    really = GLib.MainContext.ref_thread_default()

    # This compares by pointer value of the underlying GMainContext
    if really != expected:
        raise AssertionError('Function should be called in %s but was called in %s' %
                             (_describe_context(expected), _describe_context(really)))

    if not really.is_owner():
        raise AssertionError('Function should be called with %s acquired')


def highlight(s):
    return '<b>%s</b>' % s

re_markup_free = re.compile("<.*?>")


def markup_free(s):
    return re_markup_free.sub("", s)


def ask_free(s):
    s = s.strip()
    if s[-1] in('?', ':'):
        return s[:-1]
    return s


def create_scrollable(widget, with_viewport=False):
    _assert_context(ui_context)
    scrolled = Gtk.ScrolledWindow()
    scrolled.set_shadow_type(Gtk.ShadowType.ETCHED_IN)
    scrolled.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
    if with_viewport:
        scrolled.add_with_viewport(widget)
    else:
        scrolled.add(widget)
    return scrolled


def info_dialog(message):
    _assert_context(ui_context)
    dialog = Gtk.MessageDialog(assistant, Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                               Gtk.MessageType.INFO, Gtk.ButtonsType.CLOSE, message)
    dialog.connect('response', lambda d, *args: d.destroy())
    dialog.set_title('Reportbug')
    dialog.show_all()


class CustomDialog(Gtk.Dialog):
    def __init__(self, stock_image, message, buttons, *args, **kwargs):
        _assert_context(ui_context)
        Gtk.Dialog.__init__(self, "Reportbug", assistant,
                            Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                            buttons)
        # Try following the HIG
        self.set_default_response(buttons[-1])  # this is the response of the last button
        self.set_border_width(5)

        vbox = Gtk.VBox(spacing=10)
        vbox.set_border_width(6)
        self.vbox.pack_start(vbox, True, True, 0)

        # The header image + label
        hbox = Gtk.HBox(spacing=10)
        vbox.pack_start(hbox, False, True, 0)

        # TODO: deprecated, new code is meant to set the halign/valign/margin
        # properties on the child widget instead. Also this is probably
        # useless without having a child widget?
        align = Gtk.Alignment(xalign=0.5, yalign=0.5, xscale=1.0, yscale=1.0)
        hbox.pack_start(align, False, True, 0)

        image = Gtk.Image.new_from_stock(stock_image, Gtk.IconSize.DIALOG)
        hbox.pack_start(image, True, True, 0)

        label = Gtk.Label(label=message)
        label.set_line_wrap(True)
        label.set_justify(Gtk.Justification.FILL)
        label.set_selectable(True)
        label.set_property("can-focus", False)
        hbox.pack_start(label, False, True, 0)

        self.setup_dialog(vbox, *args, **kwargs)


class InputStringDialog(CustomDialog):
    def __init__(self, message):
        _assert_context(ui_context)
        CustomDialog.__init__(self, Gtk.STOCK_DIALOG_INFO, message,
                              (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                               Gtk.STOCK_OK, Gtk.ResponseType.ACCEPT))

    def setup_dialog(self, vbox):
        _assert_context(ui_context)
        self.entry = Gtk.Entry()
        vbox.pack_start(self.entry, False, True, 0)

    def get_value(self):
        _assert_context(ui_context)
        return self.entry.get_text()


class ExceptionDialog(CustomDialog):
    # Register an exception hook to display an error when the GUI breaks
    @classmethod
    def create_excepthook(cls, oldhook):
        _assert_context(reportbug_context)
        def excepthook(exctype, value, tb):
            # OK to call from any thread
            if oldhook:
                oldhook(exctype, value, tb)
            application.run_once_in_main_thread(cls.start_dialog,
                                                ''.join(traceback.format_exception(exctype, value, tb)))
        return excepthook

    @classmethod
    def start_dialog(cls, tb):
        _assert_context(ui_context)
        try:
            dialog = cls(tb)
            dialog.show_all()
        except:
            sys.exit(1)

    def __init__(self, tb):
        _assert_context(ui_context)
        CustomDialog.__init__(self, Gtk.STOCK_DIALOG_ERROR, "An error has occurred while doing an operation in Reportbug.\nPlease report the bug.", (Gtk.STOCK_CLOSE, Gtk.ResponseType.CLOSE), tb)

    def setup_dialog(self, vbox, tb):
        # The traceback
        expander = Gtk.Expander.new_with_mnemonic("More details")
        vbox.pack_start(expander, True, True, 0)

        view = Gtk.TextView()
        view.set_editable(False)
        view.get_buffer().set_text(tb)
        scrolled = create_scrollable(view)
        expander.add(scrolled)

        self.connect('response', self.on_response)

    def on_response(self, dialog, res):
        _assert_context(ui_context)
        sys.exit(1)


class ReportViewerDialog(Gtk.Dialog):
    def __init__(self, message):
        _assert_context(ui_context)
        Gtk.Dialog.__init__(self, "Reportbug", assistant,
                            Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                            (Gtk.STOCK_COPY, Gtk.ResponseType.APPLY,
                             Gtk.STOCK_CLOSE, Gtk.ResponseType.CLOSE))
        self.message = message

        self.set_default_size(400, 400)
        self.set_default_response(Gtk.ResponseType.CLOSE)
        self.set_border_width(6)
        self.connect('response', self.on_response)

        view = Gtk.TextView()
        view.get_buffer().set_text(self.message)
        self.vbox.pack_start(create_scrollable(view), True, True, 0)

        self.show_all()

    def on_response(self, dialog, res):
        _assert_context(ui_context)
        # ok Gtk.ResponseType.APPLY is ugly for Gtk.STOCK_COPY, but who cares?
        # maybe adding it as a secondary button or such is better
        if res == Gtk.ResponseType.APPLY:
            clipboard = Gtk.Clipboard.get(Gdk.SELECTION_CLIPBOARD)
            clipboard.set_text(self.message, -1)
        else:
            self.destroy()


# BTS
class Bug(object):
    """Encapsulate a bug report for the GTK+ UI"""
    def __init__(self, bug):
        self.id = bug.bug_num
        self.tag = ', '.join(bug.tags)
        self.package = bug.package
        self.status = bug.pending
        self.reporter = bug.originator
        self.date = bug.date
        self.severity = bug.severity
        self.version = ', '.join(bug.found_versions)
        self.filed_date = bug.date
        self.modified_date = bug.log_modified
        self.info = bug.subject

    def __iter__(self):
        yield self.id
        yield self.tag
        yield self.package
        yield self.info
        yield self.status
        yield self.reporter
        yield self.date
        yield self.severity
        yield self.version
        yield self.filed_date
        yield self.modified_date


class BugReport(object):
    def __init__(self, message):
        lines = message.split('\n')
        i = 0

        self.headers = []
        while i < len(lines):
            line = lines[i]
            i += 1
            if not line.strip():
                break
            self.headers.append(line)
            if line.startswith('Subject:'):
                break

        store = 0
        info = []
        has_other = False
        while i < len(lines):
            line = lines[i]
            info.append(line)
            i += 1
            if not line.strip():
                if store < 2:
                    store += 1
                continue
            if store == 2 and line == '-- Package-specific info:':
                has_other = True
                break
            store = 0

        if has_other:
            self.original_info = '\n'.join(info[:-3])
            self.others = '\n'.join(lines[i - 1:])
        else:
            self.original_info = '\n'.join(info[:-2])
            self.others = ''


    def get_others(self):
        return self.others

    def get_original_info(self):
        return self.original_info

    def get_subject(self):
        for header in self.headers:
            if 'Subject' in header:
                return header[len('Subject: '):]

    def set_subject(self, subject):
        for i in range(len(self.headers)):
            if 'Subject' in self.headers[i]:
                self.headers[i] = 'Subject: ' + subject
                break

    def wrap_bug_body(self, msg, width=79, break_long_words=False):
        """Wrap every line in the message, except the pseudoheaders"""

        # resulting body text
        body = ''
        phead = True
        for line in msg.splitlines():
            if phead:
                body += line + '\n'
                if not line.strip():
                    phead = False
                continue

            # wrap long lines, it returns a list of "sub-lines"
            tmp = textwrap.wrap(line, width=width,
                                break_long_words=break_long_words)
            body += '\n'.join(tmp) + '\n'

        return body

    def create_message(self, info):
        if self.others:
            return '{}\n{}\n\n{}'.format('\n'.join(self.headers), self.wrap_bug_body(info), self.others)

        return '{}\n{}\n'.format('\n'.join(self.headers), self.wrap_bug_body(info))


# BTS GUI
class BugPage(Gtk.EventBox, threading.Thread):
    def __init__(self, assistant, dialog, number, queryonly, bts, mirrors, http_proxy, timeout, archived):
        _assert_context(ui_context)
        threading.Thread.__init__(self)
        Gtk.EventBox.__init__(self)
        self.setDaemon(True)
        self.context = GLib.MainContext()

        self.dialog = dialog
        self.assistant = assistant
        self.application = self.assistant.application
        self.number = number
        self.queryonly = queryonly
        self.bts = bts
        self.mirrors = mirrors
        self.http_proxy = http_proxy
        self.timeout = timeout
        self.archived = archived

        self.bug_status = None

        vbox = Gtk.VBox(spacing=12)
        vbox.pack_start(Gtk.Label(label="Retrieving bug information."), False, True, 0)

        self.progress = Gtk.ProgressBar()
        self.progress.set_pulse_step(0.01)
        vbox.pack_start(self.progress, False, True, 0)

        self.add(vbox)

    def run(self):
        if not self.context.acquire():
            # should be impossible
            raise AssertionError('Could not acquire my own main-context')
        self.context.push_thread_default()

        # Start the progress bar
        GLib.timeout_add(10, self.pulse)

        info = debbugs.get_report(int(self.number), self.timeout,
                                  self.bts, mirrors=self.mirrors,
                                  http_proxy=self.http_proxy, archived=self.archived)
        if not info:
            self.application.run_once_in_main_thread(self.not_found)
        else:
            self.bug_status = info[0]
            self.application.run_once_in_main_thread(self.found, info)

    def drop_progressbar(self):
        _assert_context(ui_context)
        child = self.get_child()
        if child:
            self.remove(child)
            child.unparent()

    def pulse(self):
        _assert_context(ui_context)
        self.progress.pulse()
        return self.is_alive()

    def not_found(self):
        _assert_context(ui_context)
        self.drop_progressbar()
        self.add(Gtk.Label(label="The bug can't be fetched or it doesn't exist."))
        self.show_all()

    def found(self, info):
        _assert_context(ui_context)
        self.drop_progressbar()
        desc = info[0].subject
        bodies = info[1]
        vbox = Gtk.VBox(spacing=12)
        vbox.set_border_width(12)
        label = Gtk.Label(label='Description: ' + desc)
        label.set_line_wrap(True)
        label.set_justify(Gtk.Justification.FILL)
        vbox.pack_start(label, False, True, 0)

        views = Gtk.VBox()
        odd = False
        for body in bodies:
            view = Gtk.TextView()
            view.set_editable(False)
            # truncate excessively long messages
            # without the GTK interface can crash, e.g., reportbug -u gtk -N 711404 crashes
            # TODO: fix this properly
            view.get_buffer().set_text(body[:10000])
            if odd:
                view.set_state_flags(Gtk.StateFlags.PRELIGHT, False)
            views.pack_start(view, False, True, 0)
            odd = not odd
        scrolled = create_scrollable(views, True)
        vbox.pack_start(scrolled, True, True, 0)

        bbox = Gtk.HButtonBox()
        button = Gtk.Button(label="Open in browser")
        button.connect('clicked', self.on_open_browser)
        bbox.pack_start(button, True, True, 0)
        if not self.queryonly:
            button = Gtk.Button(label="Reply")
            button.set_image(Gtk.Image.new_from_stock(Gtk.STOCK_EDIT, Gtk.IconSize.BUTTON))
            button.connect('clicked', self.on_reply)
            bbox.pack_start(button, True, True, 0)
        vbox.pack_start(bbox, False, True, 0)

        self.add(vbox)
        self.show_all()

    def on_open_browser(self, button):
        _assert_context(ui_context)
        launch_browser(debbugs.get_report_url(self.bts, int(self.number), self.archived))

    def on_reply(self, button):
        _assert_context(ui_context)
        # Return the bug number to reportbug
        self.application.set_next_value(self.bug_status)
        # Forward the assistant to the progress bar
        self.assistant.forward_page()
        # Though we're only a page, we are authorized to destroy our parent :)
        # This would be better handled connecting externally to self.reply_button
        try:
            self.dialog.destroy()
        except AttributeError:
            pass


class BugsDialog(Gtk.Dialog):
    def __init__(self, assistant, queryonly):
        _assert_context(ui_context)
        Gtk.Dialog.__init__(self, "Reportbug: bug information", assistant,
                            Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                            (Gtk.STOCK_CLOSE, Gtk.ResponseType.CLOSE))
        self.assistant = assistant
        self.queryonly = queryonly
        self.application = assistant.application
        self.notebook = Gtk.Notebook()
        self.vbox.pack_start(self.notebook, True, True, 0)
        self.connect('response', self.on_response)
        self.set_default_size(600, 600)

    def on_response(self, *args):
        self.destroy()

    def show_bug(self, number, *args):
        page = BugPage(self.assistant, self, number, self.queryonly, *args)
        self.notebook.append_page(page, Gtk.Label(label=number))
        page.start()


# Application
class ReportbugApplication(threading.Thread):
    def __init__(self):
        _assert_context(reportbug_context)
        threading.Thread.__init__(self)
        self.setDaemon(True)

        self.queue = Queue()
        self.next_value = None

    def run(self):
        if not ui_context.acquire():
            # should be impossible
            raise AssertionError('Could not acquire UI context')
        ui_context.push_thread_default()

        Gtk.main()

    def get_last_value(self):
        _assert_context(reportbug_context)
        return self.queue.get()

    def put_next_value(self):
        _assert_context(ui_context)
        self.queue.put(self.next_value)
        self.next_value = None

    def set_next_value(self, value):
        _assert_context(ui_context)
        self.next_value = value

    def run_once_in_main_thread(self, func, *args, **kwargs):
        # OK to call from any thread

        def callback():
            _assert_context(ui_context)
            func(*args, **kwargs)
            return False

        GLib.idle_add(callback)

    def call_in_main_thread(self, func, *args, **kwargs):
        # OK to call from any thread

        def callback():
            _assert_context(ui_context)
            try:
                ret = func(*args, **kwargs)
            except BaseException as e:
                self.set_next_value(e)
            else:
                self.set_next_value(ret)

            self.put_next_value()
            return False

        GLib.idle_add(callback)
        ret = self.get_last_value()

        if isinstance(ret, BaseException):
            raise ret
        else:
            return ret


# Connection with reportbug
# Synchronize "pipe" with reportbug
class SyncReturn(RuntimeError):
    def __init__(self, result):
        _assert_context(reportbug_context)
        RuntimeError.__init__(self, result)
        self.result = result


class ReportbugConnector(object):
    def execute_operation(self, *args, **kwargs):
        _assert_context(ui_context)
        pass

    # Executed in sync with reportbug. raise SyncResult(value) to directly return to reportbug
    # Returns args and kwargs to pass to execute_operation
    def sync_pre_operation(cls, *args, **kwargs):
        _assert_context(reportbug_context)
        return args, kwargs


# Assistant
class Page(ReportbugConnector):
    next_page_num = 0
    page_type = Gtk.AssistantPageType.CONTENT
    default_complete = False
    side_image = DEBIAN_LOGO
    WARNING_COLOR = Gdk.color_parse("#fff8ae")

    def __init__(self, assistant):
        _assert_context(ui_context)
        self.assistant = assistant
        self.application = assistant.application
        self.widget = self.create_widget()
        self.widget.page = self
        self.widget.set_border_width(6)
        self.widget.show_all()
        self.page_num = Page.next_page_num

    def execute_operation(self, *args, **kwargs):
        _assert_context(ui_context)
        self.switch_in()
        self.connect_signals()
        self.empty_ok = kwargs.pop('empty_ok', False)
        self.presubj = kwargs.pop('presubj', False)
        self.execute(*args, **kwargs)
        self.assistant.show()
        self.setup_focus()

    def connect_signals(self):
        _assert_context(ui_context)

    def set_page_complete(self, complete):
        _assert_context(ui_context)
        self.assistant.set_page_complete(self.widget, complete)

    def set_page_type(self, type):
        _assert_context(ui_context)
        self.assistant.set_page_type(self.widget, type)

    def set_page_title(self, title):
        _assert_context(ui_context)
        if title:
            self.assistant.set_page_title(self.widget, title)

    # The user will see this as next page
    def switch_in(self):
        _assert_context(ui_context)
        Page.next_page_num += 1
        self.assistant.insert_page(self.widget, self.page_num)
        self.set_page_complete(self.default_complete)
        self.set_page_type(self.page_type)
        self.set_page_title("Reportbug")
        self.assistant.set_page_side_image(self.widget, GdkPixbuf.Pixbuf.new_from_file(self.side_image))
        self.assistant.set_next_page(self)
        # reportbug cannot usefully go back
        self.assistant.commit()

    # Setup keyboard focus in the page
    def setup_focus(self):
        _assert_context(ui_context)
        self.widget.grab_focus()

    # Forward page when a widget is activated(e.g. GtkEntry) only if page is complete
    def activate_forward(self, *args):
        _assert_context(ui_context)
        if self.assistant.get_page_complete(self.widget):
            self.assistant.forward_page()

    # The user forwarded the assistant to see the next page
    def switch_out(self):
        _assert_context(ui_context)

    def is_valid(self, value):
        _assert_context(ui_context)

        if self.empty_ok:
            return True
        else:
            return bool(value)

    def validate(self, *args, **kwargs):
        _assert_context(ui_context)

        value = self.get_value()
        if self.is_valid(value):
            self.application.set_next_value(value)
            self.set_page_complete(True)
        else:
            self.set_page_complete(False)


class IntroPage(Page):
    page_type = Gtk.AssistantPageType.INTRO
    default_complete = True

    def create_widget(self):
        _assert_context(ui_context)

        vbox = Gtk.VBox(spacing=24)

        label = Gtk.Label(label="""
<b>Reportbug</b> is a tool designed to make the reporting of bugs in Debian and derived distributions relatively painless.

This wizard will guide you through the bug reporting process step by step.

<b>Note:</b> bug reports are publicly archived (including the email address of the submitter).""")
        label.set_use_markup(True)
        label.set_line_wrap(True)
        label.set_justify(Gtk.Justification.FILL)
        vbox.pack_start(label, False, True, 0)

        link = Gtk.LinkButton.new_with_label("https://salsa.debian.org/reportbug-team/reportbug",
                                             "Homepage of reportbug project")
        vbox.pack_start(link, False, True, 0)
        return vbox


class GetStringPage(Page):
    def setup_focus(self):
        _assert_context(ui_context)
        self.entry.grab_focus()

    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=12)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        self.label.set_selectable(True)
        self.label.set_property("can-focus", False)
        self.entry = Gtk.Entry()
        vbox.pack_start(self.label, False, True, 0)
        vbox.pack_start(self.entry, False, True, 0)
        return vbox

    def connect_signals(self):
        _assert_context(ui_context)
        self.entry.connect('changed', self.validate)
        self.entry.connect('activate', self.activate_forward)

    def get_value(self):
        _assert_context(ui_context)
        return self.entry.get_text()

    def execute(self, prompt, options=None, force_prompt=False, default=''):
        _assert_context(ui_context)
        # Hackish: remove the text needed for textual UIs...
        GLib.idle_add(self.label.set_text, prompt.replace('(enter Ctrl+c to exit reportbug without reporting a bug)', ''))
        self.entry.set_text(default)

        if options:
            options.sort()
            completion = Gtk.EntryCompletion()
            model = Gtk.ListStore(str)
            for option in options:
                model.append([option])
            completion.set_model(model)
            completion.set_inline_selection(True)
            completion.set_text_column(0)
            self.entry.set_completion(completion)
        else:
            self.completion = None

        self.validate()


class GetPasswordPage(GetStringPage):
    def create_widget(self):
        _assert_context(ui_context)
        widget = GetStringPage.create_widget(self)
        self.entry.set_visibility(False)
        return widget


class GetMultilinePage(Page):
    def setup_focus(self):
        _assert_context(ui_context)
        self.view.grab_focus()

    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=12)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        self.label.set_selectable(True)
        self.label.set_property("can-focus", False)
        vbox.pack_start(self.label, False, True, 0)

        self.view = Gtk.TextView()
        self.buffer = self.view.get_buffer()
        scrolled = create_scrollable(self.view)
        vbox.pack_start(scrolled, True, True, 0)
        return vbox

    def connect_signals(self):
        _assert_context(ui_context)
        self.buffer.connect('changed', self.validate)

    def get_value(self):
        _assert_context(ui_context)
        text = self.buffer.get_text(self.buffer.get_start_iter(), self.buffer.get_end_iter(), True)
        return text.split('\n')

    def execute(self, prompt):
        _assert_context(ui_context)
        self.empty_ok = True
        # The result must be iterable for reportbug even if it's empty and not modified
        GLib.idle_add(self.label.set_text, prompt)
        self.buffer.set_text("")
        self.buffer.emit('changed')


class TreePage(Page):
    value_column = None

    def __init__(self, *args, **kwargs):
        _assert_context(ui_context)
        Page.__init__(self, *args, **kwargs)
        self.selection = self.view.get_selection()

    def setup_focus(self):
        _assert_context(ui_context)
        self.view.grab_focus()

    def connect_signals(self):
        _assert_context(ui_context)
        self.selection.connect('changed', self.validate)

    def get_value(self):
        _assert_context(ui_context)
        model, paths = self.selection.get_selected_rows()
        multiple = self.selection.get_mode() == Gtk.SelectionMode.MULTIPLE
        result = []
        for path in paths:
            value = model.get_value(model.get_iter(path), self.value_column)
            if value is not None:
                result.append(markup_free(value))
        if result and not multiple:
            return result[0]
        return result


class GetListPage(TreePage):
    value_column = 0

    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=12)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        vbox.pack_start(self.label, False, True, 0)

        hbox = Gtk.HBox(spacing=6)

        self.view = Gtk.TreeView()
        self.view.set_rules_hint(True)
        self.view.get_selection().set_mode(Gtk.SelectionMode.MULTIPLE)
        scrolled = create_scrollable(self.view)
        hbox.pack_start(scrolled, True, True, 0)

        bbox = Gtk.VButtonBox()
        bbox.set_spacing(6)
        bbox.set_layout(Gtk.ButtonBoxStyle.START)
        button = Gtk.Button(stock=Gtk.STOCK_ADD)
        button.connect('clicked', self.on_add)
        bbox.pack_start(button, False, True, 0)
        button = Gtk.Button(stock=Gtk.STOCK_REMOVE)
        button.connect('clicked', self.on_remove)
        bbox.pack_start(button, False, True, 0)
        hbox.pack_start(bbox, False, True, 0)

        vbox.pack_start(hbox, True, True, 0)
        return vbox

    def get_value(self):
        _assert_context(ui_context)
        values = []
        for row in self.model:
            values.append(row[self.value_column])
        return values

    def on_add(self, button):
        _assert_context(ui_context)
        dialog = InputStringDialog("Add a new item to the list")
        dialog.show_all()
        dialog.connect('response', self.on_add_dialog_response)

    def on_add_dialog_response(self, dialog, res):
        _assert_context(ui_context)
        if res == Gtk.ResponseType.ACCEPT:
            self.model.append([dialog.get_value()])
            self.validate()
        dialog.destroy()

    def on_remove(self, button):
        _assert_context(ui_context)
        model, paths = self.selection.get_selected_rows()
        # We need to transform them to iters, since paths change when removing rows
        iters = []
        for path in paths:
            iters.append(self.model.get_iter(path))
        for iter in iters:
            self.model.remove(iter)
        self.validate()

    def execute(self, prompt):
        _assert_context(ui_context)
        self.empty_ok = True

        GLib.idle_add(self.label.set_text, prompt)

        self.model = Gtk.ListStore(str)
        self.model.connect('row-changed', self.validate)
        self.view.set_model(self.model)

        self.selection.set_mode(Gtk.SelectionMode.MULTIPLE)

        self.view.append_column(Gtk.TreeViewColumn('Item', Gtk.CellRendererText(), text=0))


class WrapRendererText(Gtk.CellRendererText):
    def do_render(self, cr, widget, background_area, cell_area, flags):
        _assert_context(ui_context)
        self.set_property('wrap-width', cell_area.width)
        Gtk.CellRendererText.do_render(self, cr, widget, background_area, cell_area, flags)


GObject.type_register(WrapRendererText)


class MenuPage(TreePage):
    value_column = 0

    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=12)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        vbox.pack_start(self.label, False, True, 0)

        self.view = Gtk.TreeView()
        self.view.set_rules_hint(True)
        scrolled = create_scrollable(self.view)
        scrolled.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.ALWAYS)
        vbox.pack_start(scrolled, True, True, 0)
        vbox.show_all()
        return vbox

    def connect_signals(self):
        _assert_context(ui_context)
        TreePage.connect_signals(self)
        self.view.connect('row-activated', self.activate_forward)

    def execute(self, par, options, prompt, default=None, any_ok=False,
                order=None, extras=None, multiple=False):
        _assert_context(ui_context)
        GLib.idle_add(self.label.set_text, par)

        self.model = Gtk.ListStore(str, str)
        self.view.set_model(self.model)

        if multiple:
            self.selection.set_mode(Gtk.SelectionMode.MULTIPLE)

        self.view.append_column(Gtk.TreeViewColumn('Option', Gtk.CellRendererText(), markup=0))
        rend = WrapRendererText()
        rend.set_property('wrap-mode', Pango.WrapMode.WORD)
        rend.set_property('wrap-width', 300)
        self.view.append_column(Gtk.TreeViewColumn('Description', rend, text=1))

        default_iter = None
        # here below, 'text' is the value of the description of the item, but
        # written all on a single line, it will be wrapped by the list settings
        if isinstance(options, dict):
            if order:
                for option in order:
                    if option in options:
                        text = ' '.join(options[option].split())
                        iter = self.model.append((highlight(option), text))
                        if option == default:
                            default_iter = iter
            for option, desc in options.items():
                if not order or option not in order:
                    text = ' '.join(desc.split())
                    iter = self.model.append((highlight(option), text))
                    if option == default:
                        default_iter = iter
        else:
            for row in options:
                text = ' '.join(row[1].split())
                iter = self.model.append((highlight(row[0]), text))
                if row[0] == default:
                    default_iter = iter

        if default_iter:
            self.selection.select_iter(default_iter)


class HandleBTSQueryPage(TreePage):
    default_complete = True
    value_column = 0

    def sync_pre_operation(self, package, bts, timeout, mirrors=None, http_proxy="", queryonly=False, screen=None,
                           archived='no', source=False, title=None,
                           version=None, buglist=None, mbox_reader_cmd=None, latest_first=False):
        _assert_context(reportbug_context)
        self.bts = bts
        self.mirrors = mirrors
        self.http_proxy = http_proxy
        self.timeout = timeout
        self.archived = archived

        self.queryonly = queryonly
        if queryonly:
            self.page_type = Gtk.AssistantPageType.CONFIRM

        sysinfo = debbugs.SYSTEMS[bts]
        root = sysinfo.get('btsroot')
        if not root:
            # do we need to make a dialog for this?
            raise SyncReturn(None)

        if isinstance(package, str):
            pkgname = package
            if source:
                pkgname += '(source)'

            progress_label = 'Querying %s bug tracking system for reports on %s' % (debbugs.SYSTEMS[bts]['name'], pkgname)
        else:
            progress_label = 'Querying %s bug tracking system for reports %s' % (debbugs.SYSTEMS[bts]['name'], ' '.join([str(x) for x in package]))

        self.application.run_once_in_main_thread(self.assistant.set_progress_label, progress_label)

        try:
            (count, sectitle, hierarchy) = debbugs.get_reports(
                package, timeout, bts, mirrors=mirrors, version=version,
                http_proxy=http_proxy, archived=archived, source=source)
        except Exception as e:
            errmsg = 'Unable to connect to %s BTS (error: "%s"); ' % (debbugs.SYSTEMS[bts]['name'], repr(e))
            raise QuertBTSError(errmsg)

        try:
            if not count:
                if hierarchy is None:
                    raise NoPackage
                else:
                    raise NoBugs
            else:
                if count > 1:
                    sectitle = '%d bug reports found' % (count,)
                else:
                    sectitle = 'One bug report found'

                report = []
                for category, bugs in hierarchy:
                    buglist = []
                    for bug in bugs:
                        buglist.append(bug)
                    # XXX: this needs to be fixed in debianbts; Bugreport are
                    # not sortable(on bug_num) - see #639458
                    sorted(buglist, reverse=latest_first)
                    report.append((category, list(map(Bug, buglist))))

                return(report, sectitle), {}

        except NoPackage:
            raise NoPackage

        raise SyncReturn(None)

    def setup_focus(self):
        _assert_context(ui_context)
        self.entry.grab_focus()

    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=6)
        self.label = Gtk.Label(label="List of bugs. Select a bug to retrieve and submit more information.")
        vbox.pack_start(self.label, False, True, 6)

        hbox = Gtk.HBox(spacing=6)
        label = Gtk.Label(label="Filter:")
        hbox.pack_start(label, False, True, 0)
        self.entry = Gtk.Entry()
        hbox.pack_start(self.entry, True, True, 0)
        button = Gtk.Button()
        button.set_image(Gtk.Image.new_from_stock(Gtk.STOCK_CLEAR, Gtk.IconSize.MENU))
        button.set_relief(Gtk.ReliefStyle.NONE)
        button.connect('clicked', self.on_filter_clear)
        hbox.pack_start(button, False, True, 0)
        vbox.pack_start(hbox, False, True, 0)

        self.view = Gtk.TreeView()
        self.view.set_rules_hint(True)
        scrolled = create_scrollable(self.view)
        self.columns = ['ID', 'Tag', 'Package', 'Description', 'Status', 'Submitter', 'Date', 'Severity', 'Version',
                        'Filed date', 'Modified date']
        for col in zip(self.columns, list(range(len(self.columns)))):
            column = Gtk.TreeViewColumn(col[0], Gtk.CellRendererText(), text=col[1])
            column.set_reorderable(True)
            self.view.append_column(column)
        vbox.pack_start(scrolled, True, True, 0)

        button = Gtk.Button(label="Retrieve and submit bug information")
        button.set_image(Gtk.Image.new_from_stock(Gtk.STOCK_INFO, Gtk.IconSize.BUTTON))
        button.connect('clicked', self.on_retrieve_info)
        vbox.pack_start(button, False, True, 0)
        return vbox

    def connect_signals(self):
        _assert_context(ui_context)
        TreePage.connect_signals(self)
        self.view.connect('row-activated', self.on_retrieve_info)
        self.entry.connect('changed', self.on_filter_changed)

    def on_filter_clear(self, button):
        _assert_context(ui_context)
        self.entry.set_text("")

    def on_filter_changed(self, entry):
        _assert_context(ui_context)
        self.model.filter_text = entry.get_text().lower()
        self.filter.refilter()

    def on_retrieve_info(self, *args):
        _assert_context(ui_context)
        bug_ids = TreePage.get_value(self)
        if not bug_ids:
            info_dialog("Please select one or more bugs")
            return

        dialog = BugsDialog(self.assistant, self.queryonly)
        for id in bug_ids:
            dialog.show_bug(id, self.bts, self.mirrors, self.http_proxy, self.timeout, self.archived)
        dialog.show_all()

    def is_valid(self, value):
        _assert_context(ui_context)
        return True

    def get_value(self):
        _assert_context(ui_context)
        # The value returned to reportbug doesn't depend by a selection, but by the dialog of a bug
        return None

    def match_filter(self, iter):
        _assert_context(ui_context)
        # Flatten the columns into a single string
        text = ""
        for col in range(len(self.columns)):
            value = self.model.get_value(iter, col)
            if value:
                text += self.model.get_value(iter, col) + " "

        text = text.lower()
        # Tokens shouldn't be adjacent by default
        for token in self.model.filter_text.split(' '):
            if token in text:
                return True
        return False

    def filter_visible_func(self, model, iter, user_data=None):
        _assert_context(ui_context)
        matches = self.match_filter(iter)
        if not self.model.iter_parent(iter) and not matches:
            # If no children are visible, hide it
            it = model.iter_children(iter)
            while it:
                if self.match_filter(it):
                    return True
                it = model.iter_next(it)
            return False

        return matches

    def execute(self, buglist, sectitle):
        _assert_context(ui_context)
        GLib.idle_add(self.label.set_text, "%s. Double-click a bug to retrieve and submit more information, or press 'Next' if none match." % sectitle)

        self.model = Gtk.TreeStore(*([str] * len(self.columns)))
        for category in buglist:
            row = [None] * len(self.columns)
            row[3] = category[0]
            iter = self.model.append(None, row)
            for bug in category[1]:
                self.model.append(iter, list(map(str, bug)))

        self.selection.set_mode(Gtk.SelectionMode.MULTIPLE)

        self.model.filter_text = ""
        self.filter = self.model.filter_new()
        self.filter.set_visible_func(self.filter_visible_func)
        self.view.set_model(self.filter)


class ShowReportPage(Page):
    default_complete = True

    def create_widget(self):
        _assert_context(ui_context)
        self.page = BugPage(self.assistant, None, None, None, None, None, None, None, None)
        return self.page

    def get_value(self):
        _assert_context(ui_context)
        return None

    def is_valid(self, value):
        _assert_context(ui_context)
        return True

    def sync_pre_operation(self, *args, **kwargs):
        _assert_context(reportbug_context)
        if kwargs.get('queryonly'):
            self.page_type = Gtk.AssistantPageType.CONFIRM
        return args, kwargs

    def execute(self, number, system, mirrors, http_proxy, timeout, queryonly=False, title='', archived='no', mbox_reader_cmd=None):
        _assert_context(ui_context)
        self.page.number = number
        self.page.bts = system
        self.page.mirrors = mirrors
        self.page.http_proxy = http_proxy
        self.page.timeout = timeout
        self.page.queryonly = queryonly
        self.page.archived = archived
        self.page.start()
        self.validate()


class DisplayReportPage(Page):
    default_complete = True

    def create_widget(self):
        _assert_context(ui_context)
        self.view = Gtk.TextView()
        self.view.set_editable(False)
        scrolled = create_scrollable(self.view)
        return scrolled

    def execute(self, message, *args):
        _assert_context(ui_context)
        # 'use' args only if it's passed
        if args:
            message = message % args
        self.view.get_buffer().set_text(message)


class LongMessagePage(Page):
    default_complete = True

    def create_widget(self):
        _assert_context(ui_context)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        self.label.set_selectable(True)
        self.label.set_property("can-focus", False)
        eb = Gtk.EventBox()
        eb.add(self.label)
        return eb

    def execute(self, message, *args):
        _assert_context(ui_context)
        message = message % args
        # no need to wrap the message, it will be wrapped at display-time
        # but separate all paragraphs by an empty line
        message = '\n\n'.join(par for par in message.splitlines() if par)
        if('nnnnnn' in message):
            message = 'Thank you for your report.\n\n' + message
        GLib.idle_add(self.label.set_text, message)


class FinalMessagePage(LongMessagePage):
    page_type = Gtk.AssistantPageType.CONFIRM
    default_complete = True

    def execute(self, *args, **kwargs):
        _assert_context(ui_context)
        LongMessagePage.execute(self, *args, **kwargs)
        #self.set_page_title("Thanks for your report")


class EditorPage(Page):
    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=6)
        hbox = Gtk.HBox(spacing=12)
        hbox.pack_start(Gtk.Label(label="Subject: "), False, True, 0)
        self.subject = Gtk.Entry()
        hbox.pack_start(self.subject, True, True, 0)
        vbox.pack_start(hbox, False, True, 0)

        self.info_buffer = GtkSource.Buffer()
        self.view = GtkSource.View(buffer=self.info_buffer)
        self.view.modify_font(Pango.FontDescription("Monospace"))
        self.view.set_wrap_mode(Gtk.WrapMode.WORD)

        # We have to do the import in the UI thread, because it loads a
        # SQLite database at import time, and the Python SQLite bindings
        # don't allow transferring a SQLite handle between threads.
        global gtkspellcheck
        if gtkspellcheck is None:
            try:
                import gtkspellcheck
            except:
                gtkspellcheck = NotImplemented

        if gtkspellcheck is not NotImplemented:
            gtkspellcheck.SpellChecker(self.view)
        scrolled = create_scrollable(self.view)
        vbox.pack_start(scrolled, True, True, 0)

        expander = Gtk.Expander.new_with_mnemonic("Other system information")
        view = Gtk.TextView()
        view.modify_font(Pango.FontDescription("Monospace"))
        view.set_editable(False)
        self.others_buffer = view.get_buffer()
        scrolled = create_scrollable(view)
        expander.add(scrolled)
        vbox.pack_start(expander, False, True, 0)

        if gtkspellcheck is NotImplemented:
            box = Gtk.EventBox()
            label = Gtk.Label(label="Please install <b>python3-gtkspellcheck</b> to enable spell checking")
            label.set_use_markup(True)
            label.set_line_wrap(True)
            label.set_selectable(True)
            label.set_property("can-focus", False)
            box.add(label)
            box.modify_bg(Gtk.StateType.NORMAL, self.WARNING_COLOR)
            box.connect('button-press-event', lambda *args: box.destroy())
            vbox.pack_start(box, False, True, 0)
        return vbox

    def switch_out(self):
        global report_message
        _assert_context(ui_context)
        report_message = self.get_value()[0]
        with open(self.filename, "w", errors='backslashreplace') as f:
            f.write(report_message)

    def connect_signals(self):
        _assert_context(ui_context)
        self.info_buffer.connect('changed', self.validate)
        self.subject.connect('changed', self.validate)

    def get_value(self):
        _assert_context(ui_context)
        info = self.info_buffer.get_text(self.info_buffer.get_start_iter(),
                                         self.info_buffer.get_end_iter(),
                                         True)
        if not info.strip():
            return None
        subject = self.subject.get_text().strip()
        if not subject.strip():
            return None

        self.report.set_subject(subject)
        message = self.report.create_message(info)
        return(message, message != self.message)

    def handle_first_info(self):
        _assert_context(ui_context)
        self.focus_in_id = self.view.connect('focus-in-event', self.on_view_focus_in_event)

    def on_view_focus_in_event(self, view, *args):
        _assert_context(ui_context)
        # Empty the buffer only the first time
        self.info_buffer.set_text("")
        view.disconnect(self.focus_in_id)

    def execute(self, message, filename, editor, charset='utf-8'):
        _assert_context(ui_context)
        self.message = message
        self.report = BugReport(message)
        self.filename = filename
        self.charset = charset
        self.subject.set_text(self.report.get_subject())
        self.others_buffer.set_text(self.report.get_others())

        info = self.report.get_original_info()
        #if info.strip() == "*** Please type your report below this line ***":
        if info.strip() == "Dear Maintainer,":
            info = "Please type your report here.\nThe text will be wrapped to be max 79 chars long per line."
            self.handle_first_info()
        self.info_buffer.set_text(info)


class SelectOptionsPage(Page):
    default_complete = False

    def create_widget(self):
        _assert_context(ui_context)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        self.vbox = Gtk.VBox(spacing=6)
        self.vbox.pack_start(self.label, False, True, 6)
        self.default = None
        return self.vbox

    def on_clicked(self, button, menuopt):
        _assert_context(ui_context)
        self.application.set_next_value(menuopt)
        self.assistant.forward_page()

    def on_display_clicked(self, button):
        global report_message
        _assert_context(ui_context)
        ReportViewerDialog(report_message)

    def setup_focus(self):
        _assert_context(ui_context)
        if self.default:
            self.default.props.can_default = True
            self.default.props.has_default = True
            self.default.grab_default()
            self.default.grab_focus()

    def execute(self, prompt, menuopts, options):
        _assert_context(ui_context)
        # remove text UI indication
        prompt = prompt.replace('(e to edit)', '')
        GLib.idle_add(self.label.set_text, prompt)

        buttons = []
        for menuopt in menuopts:
            desc = options[menuopt.lower()]
            # do we really need to launch an external editor?
            if 'Change editor' in desc:
                continue
            # this will be handled using the text view below
            if 'Pipe the message through the pager' in desc:
                continue
            # stdout is a textview for us
            if 'Print message to stdout' in desc:
                button = Gtk.Button(label="Display message in a text view")
                button.connect('clicked', self.on_display_clicked)
                buttons.append(button)
            else:
                button = Gtk.Button()
                label = Gtk.Label(label=options[menuopt.lower()])
                button.add(label)
                button.connect('clicked', self.on_clicked, menuopt.lower())
                if menuopt.isupper():
                    label.set_markup("<b>%s</b>" % label.get_text())
                    self.default = button
                    buttons.insert(0, Gtk.HSeparator())
                    buttons.insert(0, button)
                else:
                    buttons.append(button)

        for button in buttons:
            self.vbox.pack_start(button, False, True, 0)

        self.vbox.show_all()


class SystemPage(Page):
    default_complete = False

    def create_widget(self):
        _assert_context(ui_context)
        hbox = Gtk.HBox()

        self.terminal = Vte.Terminal()
        self.terminal.set_cursor_blink_mode(True)
        self.terminal.connect('child-exited', self.on_child_exited)
        hbox.pack_start(self.terminal, True, True, 0)

        scrollbar = Gtk.VScrollbar()
        scrollbar.set_adjustment(self.terminal.get_vadjustment())
        hbox.pack_start(scrollbar, False, True, 0)

        return hbox

    def on_child_exited(self, terminal, exitstatus):
        _assert_context(ui_context)
        self.application.set_next_value(exitstatus)
        self.assistant.forward_page()

    def execute(self, cmdline):
        _assert_context(ui_context)
        self.terminal.spawn_sync(Vte.PtyFlags.DEFAULT, os.environ['HOME'], ['/bin/bash', '-c', cmdline], [], GLib.SpawnFlags.DO_NOT_REAP_CHILD, None, None)


class ProgressPage(Page):
    page_type = Gtk.AssistantPageType.PROGRESS

    def pulse(self):
        _assert_context(ui_context)
        self.progress.pulse()
        return True

    def create_widget(self):
        _assert_context(ui_context)
        vbox = Gtk.VBox(spacing=6)
        self.label = Gtk.Label()
        self.label.set_line_wrap(True)
        self.label.set_justify(Gtk.Justification.FILL)
        self.progress = Gtk.ProgressBar()
        self.progress.set_pulse_step(0.01)
        vbox.pack_start(self.label, False, True, 0)
        vbox.pack_start(self.progress, False, True, 0)
        GLib.timeout_add(10, self.pulse)
        return vbox

    def set_label(self, text):
        _assert_context(ui_context)
        GLib.idle_add(self.label.set_text, text)

    def reset_label(self):
        _assert_context(ui_context)
        self.set_label("This operation may take a while")


class ReportbugAssistant(Gtk.Assistant):
    def __init__(self, application):
        _assert_context(ui_context)
        Gtk.Assistant.__init__(self)
        self.application = application

        self.set_title('Reportbug')
        self.hack_buttons()
        self.showing_page = None
        self.requested_page = None
        self.progress_page = None
        self.set_default_size(600, 400)
        self.set_forward_page_func(self.forward)
        self.connect_signals()
        self.setup_pages()

    def _hack_buttons(self, widget):
        _assert_context(ui_context)
        # This is a real hack for two reasons:
        # 1. There's no other way to access action area but inspecting the assistant and searching for the back button
        # 2. Hide back button on show, because it can be shown-hidden by the assistant depending on the page
        if isinstance(widget, Gtk.Button):
            if widget.get_label() == 'gtk-go-back':
                widget.connect('show', self.on_back_show)
                return
            if widget.get_label() == 'gtk-apply':
                widget.connect('show', self.on_back_show)
                return
            if widget.get_label() == 'gtk-cancel':
                image = Gtk.Image.new_from_stock(Gtk.STOCK_QUIT,
                                                 Gtk.IconSize.BUTTON)
                widget.set_label("_Quit")
                widget.set_image(image)
                return
            if widget.get_label() == 'gtk-go-forward':
                image = Gtk.Image.new_from_stock(Gtk.STOCK_GO_FORWARD, Gtk.IconSize.BUTTON)
                widget.set_label("_Continue")
                widget.set_image(image)
                return

        if isinstance(widget, Gtk.Container):
            widget.forall(self._hack_buttons)

    def hack_buttons(self):
        _assert_context(ui_context)
        self._hack_buttons(self)

    def connect_signals(self):
        _assert_context(ui_context)
        self.connect('cancel', self.confirm_exit)
        self.connect('prepare', self.on_prepare)
        self.connect('delete-event', self.close)
        self.connect('apply', self.close)

    def on_back_show(self, widget):
        _assert_context(ui_context)
        widget.hide()

    def on_prepare(self, assistant, widget):
        _assert_context(ui_context)
        # If the user goes back then forward, we must ensure the feedback value to reportbug must be sent
        # when the user clicks on "Forward" to the requested page by reportbug
        if self.showing_page and self.showing_page == self.requested_page and self.get_current_page() > self.showing_page.page_num:
            self.application.put_next_value()
            # Reportbug doesn't support going back, so make widgets insensitive
            self.showing_page.widget.set_sensitive(False)
            self.showing_page.switch_out()

        self.showing_page = widget.page
        # Some pages might have changed the label in the while
        if self.showing_page == self.progress_page:
            self.progress_page.reset_label()

        GLib.idle_add(self.showing_page.setup_focus)

    def close(self, *args):
        _assert_context(ui_context)
        sys.exit(0)

    def confirm_exit(self, *args):
        _assert_context(ui_context)
        dialog = Gtk.MessageDialog(None, Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                                   Gtk.MessageType.WARNING, Gtk.ButtonsType.YES_NO,
                                   "Are you sure you want to quit Reportbug?")
        response = dialog.run()
        dialog.destroy()
        if response == Gtk.ResponseType.YES:
            sys.exit(0)

    def forward(self, page_num):
        _assert_context(ui_context)
        return page_num + 1

    def forward_page(self):
        _assert_context(ui_context)
        self.set_current_page(self.forward(self.showing_page.page_num))

    def set_next_page(self, page):
        _assert_context(ui_context)
        self.requested_page = page
        # If we're in progress immediately show this guy
        if self.showing_page == self.progress_page:
            self.set_current_page(page.page_num)

    def set_progress_label(self, text, *args, **kwargs):
        _assert_context(ui_context)
        self.progress_page.set_label(text % args)

    def setup_pages(self):
        _assert_context(ui_context)
        # We insert pages between the intro and the progress, so that we give the user the feedback
        # that the applications is still running when he presses the "Forward" button
        self.showing_page = IntroPage(self)
        self.showing_page.switch_in()
        self.progress_page = ProgressPage(self)
        self.progress_page.switch_in()
        Page.next_page_num = 1


# Dialogs
class YesNoDialog(ReportbugConnector, Gtk.MessageDialog):
    def __init__(self, application):
        _assert_context(ui_context)
        Gtk.MessageDialog.__init__(self, assistant, Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                                   Gtk.MessageType.QUESTION, Gtk.ButtonsType.YES_NO)
        self.application = application
        self.connect('response', self.on_response)

    def on_response(self, dialog, res):
        _assert_context(ui_context)
        self.application.set_next_value(res == Gtk.ResponseType.YES)
        self.application.put_next_value()
        self.destroy()

    def execute_operation(self, msg, yeshelp=None, nohelp=None, default=True, nowrap=False):
        _assert_context(ui_context)
        self.set_markup(msg)
        if default:
            self.set_default_response(Gtk.ResponseType.YES)
        else:
            self.set_default_response(Gtk.ResponseType.NO)
        self.show_all()


class DisplayFailureDialog(ReportbugConnector, Gtk.MessageDialog):
    def __init__(self, application):
        _assert_context(ui_context)
        Gtk.MessageDialog.__init__(self, assistant, Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                                   Gtk.MessageType.WARNING, Gtk.ButtonsType.CLOSE)
        self.application = application
        self.connect('response', self.on_response)

    def on_response(self, dialog, res):
        _assert_context(ui_context)
        self.application.put_next_value()
        self.destroy()

    def execute_operation(self, msg, *args):
        _assert_context(ui_context)
        self.set_markup(msg % args)
        self.show_all()


class GetFilenameDialog(ReportbugConnector, Gtk.FileChooserDialog):
    def __init__(self, application):
        _assert_context(ui_context)
        Gtk.FileChooserDialog.__init__(self, '', assistant, buttons=(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                                                                     Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
        self.application = application
        self.connect('response', self.on_response)

    def on_response(self, dialog, res):
        _assert_context(ui_context)
        value = None
        if res == Gtk.ResponseType.OK:
            value = self.get_filename()

        self.application.set_next_value(value)
        self.application.put_next_value()
        self.destroy()

    def execute_operation(self, title, force_prompt=False):
        _assert_context(ui_context)
        self.set_title(ask_free(title))
        self.show_all()


def log_message(*args, **kwargs):
    _assert_context(reportbug_context)
    application.run_once_in_main_thread(assistant.set_progress_label, *args, **kwargs)


def select_multiple(*args, **kwargs):
    _assert_context(reportbug_context)
    kwargs['multiple'] = True
    kwargs['empty_ok'] = True
    return menu(*args, **kwargs)


def get_multiline(prompt, *args, **kwargs):
    _assert_context(reportbug_context)
    if 'ENTER' in prompt:
        # This is a list, let's handle it the best way
        return get_list(prompt, *args, **kwargs)
    else:
        return _get_multiline(prompt, *args, **kwargs)

pages = {'get_string': GetStringPage,
         'get_password': GetPasswordPage,
         'menu': MenuPage,
         'handle_bts_query': HandleBTSQueryPage,
         'show_report': ShowReportPage,
         'long_message': LongMessagePage,
         'display_report': DisplayReportPage,
         'final_message': FinalMessagePage,
         'spawn_editor': EditorPage,
         'select_options': SelectOptionsPage,
         'get_list': GetListPage,
         'system': SystemPage,
         '_get_multiline': GetMultilinePage,
         }
dialogs = {'yes_no': YesNoDialog,
           'get_filename': GetFilenameDialog,
           'display_failure': DisplayFailureDialog,
           }


def create_forwarder(parent, klass):
    _assert_context(reportbug_context)
    def func(*args, **kwargs):
        _assert_context(reportbug_context)
        op = application.call_in_main_thread(klass, parent)
        try:
            args, kwargs = op.sync_pre_operation(*args, **kwargs)
        except SyncReturn as e:
            return e.result
        application.run_once_in_main_thread(op.execute_operation, *args, **kwargs)
        return application.get_last_value()
    return func


def forward_operations(parent, operations):
    _assert_context(reportbug_context)
    for operation, klass in operations.items():
        globals()[operation] = create_forwarder(parent, klass)


def initialize():
    global application, assistant, reportbug_context, ui_context, Vte

    try:
        gi.require_version('Vte', '2.91')
        from gi.repository import Vte
    except (ImportError,ValueError):
        message = """Please install the %s package to use the GTK+ (known as 'gtk' in reportbug) interface.
Falling back to 'text' interface."""
        dialog = Gtk.MessageDialog(None, Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
                                   Gtk.MessageType.INFO, Gtk.ButtonsType.CLOSE, None)
        dialog.set_markup(message % "<b>gir1.2-vte-2.91</b>")
        dialog.run()
        dialog.destroy()
        while Gtk.events_pending():
            Gtk.main_iteration()
        if not sys.stdout.isatty():
            os.execlp('x-terminal-emulator', 'x-terminal-emulator', '-e', 'reportbug -u text')
        return False

    # The first thread of the process runs reportbug's UI-agnostic logic
    reportbug_context = GLib.MainContext()
    if not reportbug_context.acquire():
        # should be impossible
        raise AssertionError('Could not acquire new main-context')
    reportbug_context.push_thread_default()

    # A secondary thread (the ReportbugApplication) runs the GTK UI.
    # This is the "default main context", used by GLib.idle_add() and similar
    # non-thread-aware APIs.
    ui_context = GLib.MainContext.default()

    # Exception hook
    oldhook = sys.excepthook
    sys.excepthook = ExceptionDialog.create_excepthook(oldhook)

    # GTK settings
    Gtk.Window.set_default_icon_from_file(DEBIAN_LOGO)

    application = ReportbugApplication()
    application.start()
    forward_operations(application, dialogs)

    assistant = application.call_in_main_thread(ReportbugAssistant, application)
    forward_operations(assistant, pages)

    return True


def can_input():
    _assert_context(reportbug_context)
    return True

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