#!/usr/bin/env python3
"""
Because writing GUI is non-trivial (cf. https://0xacab.org/jvoisin/mat2/issues/3),
we decided to write a Nautilus extensions instead
(cf. https://0xacab.org/jvoisin/mat2/issues/2).
The code is a little bit convoluted because Gtk isn't thread-safe,
so we're not allowed to call anything Gtk-related outside of the main
thread, so we'll have to resort to using a `queue` to pass "messages" around.
"""
# pylint: disable=no-name-in-module,unused-argument,no-self-use,import-error
import queue
import threading
from typing import Tuple
from urllib.parse import unquote
import gi
gi.require_version('Nautilus', '3.0')
gi.require_version('Gtk', '3.0')
gi.require_version('GdkPixbuf', '2.0')
from gi.repository import Nautilus, GObject, Gtk, Gio, GLib, GdkPixbuf
from libmat2 import parser_factory
# make pyflakes happy
assert Tuple
def _remove_metadata(fpath):
""" This is a simple wrapper around libmat2, because it's
easier and cleaner this way.
"""
parser, mtype = parser_factory.get_parser(fpath)
if parser is None:
return False, mtype
return parser.remove_all(), mtype
class ColumnExtension(GObject.GObject, Nautilus.MenuProvider, Nautilus.LocationWidgetProvider):
""" This class adds an item to the right-clic menu in Nautilus. """
def __init__(self):
super().__init__()
self.infobar_hbox = None
self.infobar = None
self.failed_items = list()
def __infobar_failure(self):
""" Add an hbox to the `infobar` warning about the fact that we didn't
manage to remove the metadata from every single file.
"""
self.infobar.set_show_close_button(True)
self.infobar_hbox = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
btn = Gtk.Button("Show")
btn.connect("clicked", self.__cb_show_failed)
self.infobar_hbox.pack_end(btn, False, False, 0)
infobar_msg = Gtk.Label("Failed to clean some items")
self.infobar_hbox.pack_start(infobar_msg, False, False, 0)
self.infobar.get_content_area().pack_start(self.infobar_hbox, True, True, 0)
self.infobar.show_all()
def get_widget(self, uri, window):
""" This is the method that we have to implement (because we're
a LocationWidgetProvider) in order to show our infobar.
"""
self.infobar = Gtk.InfoBar()
self.infobar.set_message_type(Gtk.MessageType.ERROR)
self.infobar.connect("response", self.__cb_infobar_response)
return self.infobar
def __cb_infobar_response(self, infobar, response):
""" Callback for the infobar close button.
"""
if response == Gtk.ResponseType.CLOSE:
self.infobar_hbox.destroy()
self.infobar.hide()
def __cb_show_failed(self, button):
""" Callback to show a popup containing a list of files
that we didn't manage to clean.
"""
# FIXME this should be done only once the window is destroyed
self.infobar_hbox.destroy()
self.infobar.hide()
window = Gtk.Window()
headerbar = Gtk.HeaderBar()
window.set_titlebar(headerbar)
headerbar.props.title = "Metadata removal failed"
close_buton = Gtk.Button("Close")
close_buton.connect("clicked", lambda _: window.close())
headerbar.pack_end(close_buton)
box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
window.add(box)
box.add(self.__create_treeview())
window.show_all()
@staticmethod
def __validate(fileinfo) -> Tuple[bool, str]:
""" Validate if a given file FileInfo `fileinfo` can be processed.
Returns a boolean, and a textreason why"""
if fileinfo.get_uri_scheme() != "file" or fileinfo.is_directory():
return False, "Not a file"
elif not fileinfo.can_write():
return False, "Not writeable"
return True, ""
def __create_treeview(self) -> Gtk.TreeView:
liststore = Gtk.ListStore(GdkPixbuf.Pixbuf, str, str)
treeview = Gtk.TreeView(model=liststore)
renderer_pixbuf = Gtk.CellRendererPixbuf()
column_pixbuf = Gtk.TreeViewColumn("Image", renderer_pixbuf, pixbuf=0)
treeview.append_column(column_pixbuf)
for idx, name in enumerate(['Reason', 'File']):
renderer_text = Gtk.CellRendererText()
column_text = Gtk.TreeViewColumn(name, renderer_text, text=idx+1)
treeview.append_column(column_text)
for (fname, mtype, reason) in self.failed_items:
# This part is all about adding mimetype icons to the liststore
icon = Gio.content_type_get_icon('text/plain' if not mtype else mtype)
# in case we don't have the corresponding icon,
# we're adding `text/plain`, because we have this one for sure™
names = icon.get_names() + ['text/plain', ]
icon_theme = Gtk.IconTheme.get_default()
for name in names:
try:
img = icon_theme.load_icon(name, Gtk.IconSize.BUTTON, 0)
break
except GLib.GError:
pass
liststore.append([img, reason, fname])
treeview.show_all()
return treeview
def __create_progressbar(self) -> Gtk.ProgressBar:
""" Create the progressbar used to notify that files are currently
being processed.
"""
self.infobar.set_show_close_button(False)
self.infobar.set_message_type(Gtk.MessageType.INFO)
self.infobar_hbox = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
progressbar = Gtk.ProgressBar()
self.infobar_hbox.pack_start(progressbar, True, True, 0)
progressbar.set_show_text(True)
self.infobar.get_content_area().pack_start(self.infobar_hbox, True, True, 0)
self.infobar.show_all()
return progressbar
def __update_progressbar(self, processing_queue, progressbar) -> bool:
""" This method is run via `Glib.add_idle` to update the progressbar."""
try:
fname = processing_queue.get(block=False)
except queue.Empty:
return True
# `None` is the marker put in the queue to signal that every selected
# file was processed.
if fname is None:
self.infobar_hbox.destroy()
self.infobar.hide()
if len(self.failed_items):
self.__infobar_failure()
if not processing_queue.empty():
print("Something went wrong, the queue isn't empty :/")
return False
progressbar.pulse()
progressbar.set_text("Cleaning %s" % fname)
progressbar.show_all()
self.infobar_hbox.show_all()
self.infobar.show_all()
return True
def __clean_files(self, files: list, processing_queue: queue.Queue) -> bool:
""" This method is threaded in order to avoid blocking the GUI
while cleaning up the files.
"""
for fileinfo in files:
fname = fileinfo.get_name()
processing_queue.put(fname)
valid, reason = self.__validate(fileinfo)
if not valid:
self.failed_items.append((fname, None, reason))
continue
fpath = unquote(fileinfo.get_uri()[7:]) # `len('file://') = 7`
success, mtype = _remove_metadata(fpath)
if not success:
self.failed_items.append((fname, mtype, 'Unsupported/invalid'))
processing_queue.put(None) # signal that we processed all the files
return True
def __cb_menu_activate(self, menu, files):
""" This method is called when the user clicked the "clean metadata"
menu item.
"""
self.failed_items = list()
progressbar = self.__create_progressbar()
progressbar.set_pulse_step = 1.0 / len(files)
self.infobar.show_all()
processing_queue = queue.Queue()
GLib.idle_add(self.__update_progressbar, processing_queue, progressbar)
thread = threading.Thread(target=self.__clean_files, args=(files, processing_queue))
thread.daemon = True
thread.start()
def get_background_items(self, window, file):
""" https://bugzilla.gnome.org/show_bug.cgi?id=784278 """
return None
def get_file_items(self, window, files):
""" This method is the one allowing us to create a menu item.
"""
# Do not show the menu item if not a single file has a chance to be
# processed by mat2.
if not any([is_valid for (is_valid, _) in map(self.__validate, files)]):
return None
item = Nautilus.MenuItem(
name="MAT2::Remove_metadata",
label="Remove metadata",
tip="Remove metadata"
)
item.connect('activate', self.__cb_menu_activate, files)
return [item, ]