json2gtk

#!/usr/bin/env python3
import sys
import gi
import json
gi.require_version('Gtk', '4.0')
gi.require_version('Adw', '1')
from gi.repository import Gtk, Adw


class JSONML:
    def __init__(self, data):
        self.data = data
    def __getitem__(self, tag):
        if type(tag) is int: return self.data[tag]
        if type(tag) is str: return JSONML(
            [item[2] for d in self.data for item in d if type(item) is list and item[0] == tag and len(item)>=2]
        )

class MainWindow(Gtk.ApplicationWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        obj = JSONML([[json.load(sys.stdin)]])
        rootbox = Gtk.Box()
        listbox = Gtk.ListBox(hexpand=True,valign=Gtk.Align.START)
        items = obj["rss"]["channel"]["item"]
        for item in items:
            listbox.append(Adw.ActionRow(title=[tag[2][0] for tag in item if tag[0] == 'title'][0]))
        rootbox.append(listbox)
        self.set_child(rootbox)

class MyApp(Adw.Application):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.connect('activate', self.on_activate)

    def on_activate(self, app):
        MainWindow(application=app).present()

app = MyApp(application_id="com.example.GtkApplication")
app.run(sys.argv)