vincentbernat.i3wm-configuration/bin/xdg-app-chooser

#!/usr/bin/env python3

"""Simple application selector relying on GTK app chooser dialog.
"""

# This doesn't allow to set a default application for a MIME type. Use
# "xdg-mime default something.desktop mime/type" to change a default.
# Usually, it will update ~/.config/mimeapps.list.

import argparse
import sys
import gi


parser = argparse.ArgumentParser(description=sys.modules[__name__].__doc__)
parser.add_argument("file",
                    metavar="FILE",
                    help="file to open")
options = parser.parse_args()

gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, Gio

# Query MIME TYPE
f = Gio.File.new_for_path(options.file)
file_info = f.query_info("standard::content-type", 0)
content_type = file_info.get_content_type()

# Display app chooser dialog box
dialog = Gtk.AppChooserDialog.new_for_content_type(None,
                                                   Gtk.DialogFlags.MODAL,
                                                   content_type)
dialog.set_position(Gtk.WindowPosition.CENTER_ALWAYS)
dialog.get_widget().set_show_default(True)
dialog.get_widget().set_show_fallback(True)
response = dialog.run()

# Execute the selected program
if response == Gtk.ResponseType.OK:
    app_info = dialog.get_app_info()
    dialog.destroy()
    # TODO: make it launch synchronously
    sys.exit(0
             if app_info.launch([f])
             else 1)
sys.exit(1)