Do not perform an online search when the text is not enough

src/lib/registration/widgets/package_search.rb

@@ -23,6 +23,7 @@
 require "registration/widgets/remote_packages_table"
 require "registration/widgets/remote_package_details"
 require "registration/package_search"
+require "yast2/popup"
 
 Yast.import "Popup"
 
@@ -138,6 +139,7 @@ def start_search_event?(event)
       #
       # @param text [String] Text to search for
       def search_package(text)
+        return unless valid_search_text?(text)
         @search = ::Registration::PackageSearch.new(text: text)
         # TRANSLATORS: searching for packages
         Yast::Popup.Feedback(_("Searching..."), _("Searching for packages")) do
@@ -228,6 +230,23 @@ def disable_addon?(addon)
         Yast::Popup.YesNo(message)
       end
 
+      MINIMAL_SEARCH_TEXT_SIZE = 2
+
+      # Determines whether the search text is valid or not
+      #
+      # @param text [String] Text to search for
+      def valid_search_text?(text)
+        return true if text.to_s.size >= MINIMAL_SEARCH_TEXT_SIZE
+        Yast2::Popup.show(
+          format(
+            # TRANSLATORS: the minimal size of the text to search for package names
+            _("Please, type at least %{minimal_size} characters to search for."),
+            minimal_size: MINIMAL_SEARCH_TEXT_SIZE
+          )
+        )
+        false
+      end
+
       # Determines whether the addon is still needed
       def needed_addon?(addon)
         selected_packages.any? { |pkg| pkg.addon == addon }

test/registration/widgets/package_search_test.rb

@@ -66,9 +66,10 @@
   describe "#handle" do
     context "when the user asks for a package" do
       let(:event) { { "WidgetID" => "search_form_button" } }
+      let(:text) { "gnome" }
 
       let(:search_form) do
-        instance_double(Registration::Widgets::PackageSearchForm, text: "gnome")
+        instance_double(Registration::Widgets::PackageSearchForm, text: text)
       end
 
       before do
@@ -79,7 +80,7 @@
 
       it "searches for the package in SCC" do
         expect(Registration::PackageSearch).to receive(:new)
-          .with(text: "gnome").and_return(search)
+          .with(text: text).and_return(search)
         subject.handle(event)
       end
 
@@ -88,6 +89,16 @@
         expect(package_details).to receive(:update).with(package)
         subject.handle(event)
       end
+
+      context "when the search text is not enough" do
+        let(:text) { "g" }
+
+        it "asks the user to introduce some text" do
+          expect(Yast2::Popup).to receive(:show)
+            .with(/at least/)
+          subject.handle(event)
+        end
+      end
     end
 
     context "when a package is selected for installation" do