[DeckEditor] Offer .cod conversion when tagging non-.cod decks

When the user tags a deck loaded from a .txt file, prompt for
conversion to the Cockatrice format (sharing the deck preview prompt)
and convert the deck in place via DeckLoader::convertToCockatriceFormat,
updating lastLoadInfo so the deck saves as .cod.


Took 2 minutes

cockatrice/src/interface/widgets/deck_editor/deck_editor_deck_dock_widget.cpp

@@ -2,6 +2,8 @@
 
 #include "../../../client/settings/cache_settings.h"
 #include "../../../client/settings/shortcuts_settings.h"
+#include "../../deck_loader/deck_loader.h"
+#include "../dialogs/dlg_convert_deck_to_cod_format.h"
 #include "../settings_page/user_interface_settings_page.h"
 #include "../tabs/api/commander_spellbook/commander_bracket_widget.h"
 #include "deck_list_style_proxy.h"
@@ -176,6 +178,23 @@ void DeckEditorDeckDockWidget::createDeckDock()
     connect(deckTagsDisplayWidget, &DeckPreviewDeckTagsDisplayWidget::tagsChanged, deckStateManager,
             &DeckStateManager::setTags);
 
+    // Local deck files in non-Cockatrice formats (e.g. .txt) can't store tags.
+    // Offer to convert the file to .cod before the user opens the tag dialog.
+    deckTagsDisplayWidget->setConversionPromptHandler([this] {
+        const LoadedDeck::LoadInfo &loadInfo = deckStateManager->getLastLoadInfo();
+        if (loadInfo.fileName.isEmpty()) {
+            return true; // A new, unsaved deck can hold tags in memory.
+        }
+        return promptFileConversionIfRequired(this, loadInfo.fileName, [this] {
+            LoadedDeck deck = deckStateManager->toLoadedDeck();
+            if (!DeckLoader::convertToCockatriceFormat(deck)) {
+                return false;
+            }
+            deckStateManager->setLastLoadInfo(deck.lastLoadInfo);
+            return true;
+        });
+    });
+
     activeGroupCriteriaLabel = new QLabel(this);
 
     activeGroupCriteriaComboBox = new QComboBox(this);

cockatrice/src/interface/widgets/deck_editor/deck_state_manager.h

@@ -116,6 +116,15 @@ public:
      */
     void clearDeck();
 
+    /**
+     * @brief Gets the lastLoadInfo.
+     * @return The lastLoadInfo
+     */
+    const LoadedDeck::LoadInfo &getLastLoadInfo() const
+    {
+        return lastLoadInfo;
+    }
+
     /**
      * @brief Sets the lastLoadInfo.
      * @param loadInfo The lastLoadInfo