Improve SearchView

src/Core/FlatpakBackend.vala

@@ -1564,6 +1564,38 @@ public class AppCenterCore.FlatpakBackend : Backend, Object {
         return package_list[id];
     }
 
+    public bool is_flathub_enabled () {
+        if (user_installation != null) {
+            try {
+                var remotes = user_installation.list_remotes (null);
+                for (int i = 0; i < remotes.length; i++) {
+                    if (remotes[i].get_title () == "Flathub") {
+                        return true;
+                    }
+                }
+            } catch (Error e) {
+                critical ("Unable to check if Flathub is enabled: %s", e.message);
+                return false;
+            }
+        }
+
+        if (system_installation != null) {
+            try {
+                var remotes = system_installation.list_remotes (null);
+                for (int i = 0; i < remotes.length; i++) {
+                    if (remotes[i].get_title () == "Flathub") {
+                        return true;
+                    }
+                }
+            } catch (Error e) {
+                critical ("Unable to check if Flathub is enabled: %s", e.message);
+                return false;
+            }
+        }
+
+        return false;
+    }
+
     private static GLib.Once<FlatpakBackend> instance;
     public static unowned FlatpakBackend get_default () {
         return instance.once (() => { return new FlatpakBackend (); });

src/Views/SearchView.vala

@@ -23,6 +23,7 @@ public class AppCenter.SearchView : Gtk.Box {
     public signal void show_app (AppCenterCore.Package package);
 
     public string? current_search_term { get; set; default = null; }
+    public bool is_flathub_enabled { get; set; default = false; }
 
     private Gtk.ListBox list_box;
     private uint current_visible_index = 0U;
@@ -32,11 +33,16 @@ public class AppCenter.SearchView : Gtk.Box {
         var flathub_link = "<a href='https://flathub.org'>%s</a>".printf (_("Flathub"));
         var alert_view = new Granite.Widgets.AlertView (
             _("No Apps Found"),
-            _("Try changing search terms. You can also sideload Flatpak apps e.g. from %s").printf (flathub_link),
+            _("Try changing search terms. You can also sideload Flatpak apps."),
             "edit-find-symbolic"
         );
         alert_view.show_all ();
 
+        is_flathub_enabled = AppCenterCore.FlatpakBackend.get_default ().is_flathub_enabled ();
+        if (!is_flathub_enabled) {
+            alert_view.description = _("Try changing search terms. You can also sideload Flatpak apps e.g. from %s").printf (flathub_link);
+        }
+
         list_store = new GLib.ListStore (typeof (AppCenterCore.Package));
 
         list_box = new Gtk.ListBox () {
@@ -55,6 +61,10 @@ public class AppCenter.SearchView : Gtk.Box {
         add (scrolled);
 
         notify["current-search-term"].connect (() => {
+            if (is_flathub_enabled) {
+                return;
+            }
+
             var dyn_flathub_link = "<a href='https://flathub.org/apps/search/%s'>%s</a>".printf (current_search_term, _("Flathub"));
             alert_view.description = _("Try changing search terms. You can also sideload Flatpak apps e.g. from %s").printf (dyn_flathub_link);
         });