Detect existing information and allow the process to be skipped

src/main.py

@@ -26,7 +26,8 @@ class Application(Gtk.Application):
 
         self.timeout_id = None
         self.lines = []
-        self.ready = False
+        self.output_dir = os.path.join(os.getenv('HOME'), '.local', 'share',
+                                       'librem5-get-package-info')
 
     def do_activate(self):
         window = Gtk.ApplicationWindow(application=self)
@@ -36,20 +37,52 @@ class Application(Gtk.Application):
                                show_close_button=True)
         window.set_titlebar(header)
 
-        self.output_dir = os.path.join(os.getenv('HOME'), '.local', 'share', 'librem5-get-package-info')
+        self.layout = Gtk.Box(orientation='vertical', margin=8, spacing=12)
+
+        if os.path.exists(self.output_dir):
+
+            question_label = Gtk.Label()
+            question_label.set_markup(_('<b>Existing information is available.</b>'))
+            view_button = Gtk.Button(
+                label=_('View existing information'), halign=Gtk.Align.CENTER)
+            view_button.connect('clicked', self.open_docs)
+            list_button = Gtk.Button(
+                label=_('Generate new information'), halign=Gtk.Align.CENTER)
+            list_button.connect('clicked', self.generate_new_info)
+
+            self.question_layout = Gtk.Box(orientation='vertical', margin=8,
+                                           spacing=12)
+            self.question_layout.add(question_label)
+            self.question_layout.add(view_button)
+            self.question_layout.add(list_button)
+            self.layout.add(self.question_layout)
+
+        else:
+            self.start_listing()
+
+        window.add(self.layout)
+        window.set_default_size(360, 720)
+        window.show_all()
+
+    def generate_new_info(self, *args):
+
+        self.question_layout.hide()
+        self.start_listing()
+
+    def start_listing(self):
+
+        layout = Gtk.Box(orientation='vertical', margin=8, spacing=12)
+        self.layout.add(layout)
 
-        vbox = Gtk.Box(orientation='vertical', margin=8, spacing=12)
         self.label = Gtk.Label(hexpand=True, hexpand_set=True, ellipsize=True)
         self.label.set_xalign(0.0)
 
         try:
-            if os.path.exists(self.output_dir):
-                self.ready = True
-            else:
+            if not os.path.exists(self.output_dir):
                 os.mkdir(self.output_dir)
 
             self.progress = Gtk.ProgressBar(show_text=True)
-            vbox.add(self.progress)
+            layout.add(self.progress)
             self.label.set_text(_('Finding package information'))
             self.label.set_justify(Gtk.Justification.LEFT)
 
@@ -61,15 +94,8 @@ class Application(Gtk.Application):
                 'https://docs.puri.sm/Librem_5.html for information about '
                 'packages.'))
 
-        self.button = Gtk.Button(label=_('Open Package List'))
-        self.button.set_sensitive(self.ready)
-        self.button.connect('clicked', self.open_docs)
-
-        vbox.add(self.label)
-        vbox.add(self.button)
-        window.add(vbox)
-        window.set_default_size(360, 720)
-        window.show_all()
+        layout.add(self.label)
+        layout.show_all()
 
     def get_installed_packages(self):
 
@@ -121,8 +147,15 @@ class Application(Gtk.Application):
             self.update_label()
 
         except StopIteration:
+            self.lines.pop()
             self.update_label()
-            self.button.set_sensitive(self.ready)
+
+            self.button = Gtk.Button(label=_('Open Package List'),
+                                     halign=Gtk.Align.CENTER)
+            self.button.connect('clicked', self.open_docs)
+            self.layout.add(self.button)
+            self.button.show()
+
             return False
 
         return True