Multilabel support & Label refactoring (#17)

Reviewed-on: moritz/ptouch-prnt#17

src/PtouchPrint.cpp

@@ -132,11 +132,46 @@ bool PtouchPrint::handlePrinting() {
         return true;
     }
 
-    // Build label using LabelBuilder
+    // Build label incrementally, appending when --new is encountered
     graphics::LabelBuilder labelBuilder(printer->getPrinterInfo().pixelLines);
+    std::unique_ptr<graphics::ILabel> finalLabel = nullptr;
+
+    // Debug: print command sequence
+    spdlog::debug("Processing {} commands:", options.commands.size());
+    for (size_t i = 0; i < options.commands.size(); ++i) {
+        const auto& [cmdType, value] = options.commands[i];
+        spdlog::debug("  Command {}: type={}, value='{}'", i, static_cast<int>(cmdType), value);
+    }
 
     for (const auto& [cmdType, value] : options.commands) {
         switch (cmdType) {
+            case cli::CommandType::NewLabel: {
+                // Finish current label and append to final label
+                spdlog::debug("Encountered --new, finishing current label segment");
+                auto currentLabel = labelBuilder.build();
+                if (!finalLabel) {
+                    // First label becomes the base
+                    finalLabel = std::move(currentLabel);
+                } else {
+                    // If finalLabel is empty (width=0), replace it instead of appending
+                    if (finalLabel->getWidth() == 0) {
+                        spdlog::debug("Final label is empty, replacing instead of appending");
+                        finalLabel = std::move(currentLabel);
+                    } else if (currentLabel->getWidth() == 0) {
+                        // Current label is empty, skip appending
+                        spdlog::debug("Current label is empty, skipping append");
+                    } else {
+                        // Both labels have content, append
+                        if (!finalLabel->append(*currentLabel)) {
+                            spdlog::error("Failed to append label");
+                            return false;
+                        }
+                    }
+                }
+                // Reset builder for next label
+                labelBuilder = graphics::LabelBuilder(printer->getPrinterInfo().pixelLines);
+                break;
+            }
             case cli::CommandType::Text:
                 labelBuilder.addText(value);
                 break;
@@ -178,9 +213,31 @@ bool PtouchPrint::handlePrinting() {
         }
     }
 
-    // Build and print the label
-    auto label = labelBuilder.build();
-    if (!mPrinterService->printLabel(std::move(label))) {
+    // Build and append final label segment
+    auto lastLabel = labelBuilder.build();
+    if (!finalLabel) {
+        // Only one label, no --new was used
+        finalLabel = std::move(lastLabel);
+    } else {
+        // Handle empty labels
+        if (finalLabel->getWidth() == 0) {
+            // Final label is empty, replace it
+            spdlog::debug("Final label is empty, replacing with last segment");
+            finalLabel = std::move(lastLabel);
+        } else if (lastLabel->getWidth() == 0) {
+            // Last segment is empty, skip appending
+            spdlog::debug("Last label segment is empty, skipping append");
+        } else {
+            // Both have content, append
+            if (!finalLabel->append(*lastLabel)) {
+                spdlog::error("Failed to append final label segment");
+                return false;
+            }
+        }
+    }
+
+    // Print the final label
+    if (!mPrinterService->printLabel(std::move(finalLabel))) {
         spdlog::error("An error occurred while printing");
         return false;
     }