Add edit mode toggle and entry activation

tests/tui_test.go

@@ -62,3 +62,26 @@ func TestPaneSwitching(t *testing.T) {
 	m = nm.(tui.Model)
 	assert.Equal(t, "localhost", m.SelectedEntry().Hostname)
 }
+
+func TestEditModeToggleAndActivation(t *testing.T) {
+	sample := "127.0.0.1 localhost\n192.168.1.10 example.com"
+	lines := strings.Split(sample, "\n")
+	hf, _, err := core.ParseHostsContent(lines)
+	require.NoError(t, err)
+
+	m := tui.NewModel(hf)
+
+	// enter edit mode
+	nm, _ := m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'e'}})
+	m = nm.(tui.Model)
+	assert.Equal(t, tui.EditMode, m.Mode())
+
+	// toggle active state of first entry
+	nm, _ = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'a'}})
+	m = nm.(tui.Model)
+	assert.False(t, m.SelectedEntry().Active)
+
+	// status bar should reflect edit mode
+	view := m.View()
+	assert.Contains(t, view, "EDIT MODE")
+}