leveraging python3 gtk and webkit with nix

shell.nix

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

mkShell {

  # Nixpkgs in include in shell
  buildInputs = [
    gobject-introspection
    python3Packages.pygobject3
    gtk3
    webkitgtk
    glib-networking # Needed for TLS
  ];

  # Environment tweaks
  shellHook = ''
    # required for https://www.reddit.com/r/NixOS/comments/k1lt7c/comment/gdpphid/
    export GIO_MODULE_DIR=${glib-networking}/lib/gio/modules/
    # per https://github.com/tauri-apps/tauri/issues/4315#issuecomment-1207804495
    export WEBKIT_DISABLE_COMPOSITING_MODE=1
  '';
}

webkit_main.py

# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright (C) 2015-2016 Adrian Perez <[email protected]>
# Copyright (C) 2016 Nathan Hoad <[email protected]>
#
# Distributed under terms of the MIT license.
# Original src: https://github.com/aperezdc/webkit2gtk-python-webextension-example/blob/ec83c18d1926de3fcce9794b1c048102bc2f73d2/browse-with-extension
# 
# The idea was for the to potentially replace the reg.py python2 gtk and webkit scripts used at SCaLE
# https://github.com/socallinuxexpo/scale-network/tree/d695fc5f1121b4715a0b602508e4d0fe600a8d39/pi/scripts

import gi
gi.require_version("WebKit2", "4.0")

from gi.repository import WebKit2, Gtk
from os import path
import sys

mydir = path.abspath(path.dirname(__file__))
print("Extension directory:", mydir)

ctx = WebKit2.WebContext.get_default()

wnd = Gtk.Window()
web = WebKit2.WebView.new_with_context(ctx)
wnd.connect("destroy", Gtk.main_quit)
wnd.add(web)
wnd.set_default_size(1152, 800)
wnd.show_all()

def on_load_changed(webview, event):
    if event == WebKit2.LoadEvent.FINISHED:
        wnd.set_title(webview.get_title())
    else:
        wnd.set_title("Loading...  {:0.1f}%"
                .format(webview.get_estimated_load_progress()))

def on_load_failed(webview, event, url, error):
    print("Error loading", url, "-", error)

web.connect("load-changed", on_load_changed)
web.connect("load-failed", on_load_failed)

if len(sys.argv) > 1:
    web.load_uri(sys.argv[1])
else:
    # Duck Duck Go
    web.load_uri("http://ddg.gg")

Gtk.main()