Fix copy half-cut print handling

app/app.py

@@ -37,6 +37,7 @@ PRINT_COMMAND = os.environ.get("PRINT_COMMAND", DEFAULT_PRINT_COMMAND)
 PRINT_ENABLED = os.environ.get("PRINT_ENABLED", "1").lower() in {"1", "true", "yes", "on"}
 DPI = int(os.environ.get("LABEL_DPI", "180"))
 PTOUCH_SUPPORTS_HALFCUT: bool | None = None
+PTOUCH_SUPPORTS_COPIES: bool | None = None
 
 TAPE_WIDTHS_MM = [3.5, 6, 9, 12, 18, 24]
 PRINTABLE_TAPE_PX = {
@@ -223,7 +224,7 @@ def draw_cutmark(draw: ImageDraw.ImageDraw, width_px: int, height_px: int, scale
         y += dash + gap
 
 
-def render_design(design: dict[str, Any]) -> Path:
+def render_design_image(design: dict[str, Any]) -> Image.Image:
     tape_width = float(design.get("tapeWidthMm", 24))
     if tape_width not in TAPE_WIDTHS_MM:
         raise ValueError("Ungueltige Bandbreite.")
@@ -267,6 +268,17 @@ def render_design(design: dict[str, Any]) -> Path:
     if design.get("cutMode") in {"cutmark", "cutmark-chain"}:
         draw_cutmark(draw, image.width, image.height, scale)
 
+    return image
+
+
+def render_design(design: dict[str, Any], copies: int = 1) -> Path:
+    image = render_design_image(design)
+    if copies > 1:
+        combined = new_label_image(image.width * copies, image.height)
+        for index in range(copies):
+            combined.paste(image, (index * image.width, 0))
+        image = combined
+
     output = LABEL_DIR / f"label-{uuid.uuid4().hex}.png"
     image.save(output)
     return output
@@ -288,9 +300,35 @@ def ptouch_supports_halfcut() -> bool:
     return PTOUCH_SUPPORTS_HALFCUT
 
 
-def cut_args_for_design(design: dict[str, Any]) -> str:
+def ptouch_supports_copies() -> bool:
+    global PTOUCH_SUPPORTS_COPIES
+    if PTOUCH_SUPPORTS_COPIES is not None:
+        return PTOUCH_SUPPORTS_COPIES
+    result = subprocess.run(
+        ["ptouch-print", "--help"],
+        capture_output=True,
+        check=False,
+        text=True,
+        timeout=10,
+    )
+    help_text = f"{result.stdout}\n{result.stderr}"
+    PTOUCH_SUPPORTS_COPIES = "--copies" in help_text
+    return PTOUCH_SUPPORTS_COPIES
+
+
+def effective_cut_mode(design: dict[str, Any], copies: int) -> str:
+    cut_mode = str(design.get("cutMode", "auto"))
+    if copies > 1 and design.get("halfcut", "on") == "on":
+        if cut_mode == "cutmark":
+            return "cutmark-chain"
+        if cut_mode == "auto":
+            return "chain"
+    return cut_mode
+
+
+def cut_args_for_design(design: dict[str, Any], copies: int) -> str:
     args = []
-    if design.get("cutMode") in {"chain", "cutmark-chain"}:
+    if effective_cut_mode(design, copies) in {"chain", "cutmark-chain"}:
         args.append("--chain")
     halfcut = design.get("halfcut", "on")
     if halfcut == "off":
@@ -307,8 +345,11 @@ def cut_args_for_design(design: dict[str, Any]) -> str:
 
 
 def run_print_command(image_path: Path, copies: int, design: dict[str, Any]) -> subprocess.CompletedProcess[str]:
-    cut_args = cut_args_for_design(design)
-    command = PRINT_COMMAND.format(image=shlex.quote(str(image_path)), copies=copies, cut_args=cut_args)
+    cut_args = cut_args_for_design(design, copies)
+    command_copies = copies if "{copies}" in PRINT_COMMAND else 1
+    command = PRINT_COMMAND.format(image=shlex.quote(str(image_path)), copies=command_copies, cut_args=cut_args)
+    if copies > 1 and "{copies}" not in PRINT_COMMAND and ptouch_supports_copies():
+        command = f"{command} --copies {copies}"
     if cut_args and "{cut_args}" not in PRINT_COMMAND:
         command = f"{command} {cut_args}"
     process = subprocess.Popen(
@@ -333,9 +374,21 @@ def run_print_command(image_path: Path, copies: int, design: dict[str, Any]) ->
 
 
 def print_label(image_path: Path, copies: int, design: dict[str, Any]) -> list[subprocess.CompletedProcess[str]]:
-    if "{copies}" in PRINT_COMMAND:
-        return [run_print_command(image_path, copies, design)]
-    return [run_print_command(image_path, 1, design) for _ in range(copies)]
+    return [run_print_command(image_path, copies, design)]
+
+
+def should_render_copies_as_strip(design: dict[str, Any], copies: int) -> bool:
+    if copies <= 1:
+        return False
+    if design.get("halfcut", "on") == "on":
+        if ptouch_supports_copies() or "{copies}" in PRINT_COMMAND:
+            return False
+        raise RuntimeError(
+            "Mehrere Kopien mit Halbschnitt brauchen einen echten Kopien-Druckjob. "
+            "Ein langes PNG kann keine Halbschnitte zwischen den Etiketten ausloesen. "
+            "Bitte eine ptouch-print-Version mit --copies verwenden."
+        )
+    return True
 
 
 def detect_tape_width() -> tuple[float | None, str]:
@@ -428,7 +481,7 @@ def mobile():
 def api_preview():
     try:
         design, _copies = design_from_request()
-        image_path = render_design(design)
+        image_path = render_design(design, 1)
         return jsonify({"ok": True, "image": f"/labels/{image_path.name}"})
     except Exception as exc:
         return jsonify({"ok": False, "error": str(exc)}), 400
@@ -438,12 +491,14 @@ def api_preview():
 def api_print():
     try:
         design, copies = design_from_request()
-        image_path = render_design(design)
+        render_copies = copies if should_render_copies_as_strip(design, copies) else 1
+        print_copies = 1 if render_copies > 1 else copies
+        image_path = render_design(design, render_copies)
         if PRINT_ENABLED:
             if not PRINT_LOCK.acquire(blocking=False):
                 raise RuntimeError("Es laeuft bereits ein Druckjob. Bitte warten oder haengenden ptouch-print-Prozess beenden.")
             try:
-                results = print_label(image_path, copies, design)
+                results = print_label(image_path, print_copies, design)
                 failed = next((result for result in results if result.returncode != 0), None)
                 if failed:
                     raise RuntimeError(format_print_error(failed))

app/static/mobile.css

@@ -167,6 +167,13 @@ button.primary {
   color: #a7e8af;
 }
 
+.field-note {
+  margin: 0;
+  color: #b7b7b7;
+  font-size: 13px;
+  line-height: 1.35;
+}
+
 .bottom-actions {
   position: fixed;
   left: 0;

app/static/style.css

@@ -157,6 +157,12 @@ textarea {
   line-height: 1.4;
 }
 
+.field-note {
+  color: #b7b7b7;
+  font-size: 13px;
+  line-height: 1.35;
+}
+
 .sidebar label {
   display: grid;
   gap: 6px;

app/templates/index.html

@@ -72,7 +72,7 @@
             Schnitt
             <select id="cutMode">
               <option value="auto">Normal</option>
-              <option value="chain">Kettendruck / kein Endschnitt</option>
+              <option value="chain">Kettendruck / Streifen</option>
               <option value="cutmark">Schnittmarke drucken</option>
               <option value="cutmark-chain">Kettendruck + Schnittmarke</option>
             </select>
@@ -84,6 +84,7 @@
               <option value="off">Aus</option>
             </select>
           </label>
+          <p class="field-note">Bei mehreren Kopien mit Halbschnitt wird automatisch Kettendruck verwendet.</p>
         </section>
 
         <section>

app/templates/mobile.html

@@ -71,7 +71,7 @@
           Schnitt
           <select id="mobileCutMode">
             <option value="auto">Normal</option>
-            <option value="chain">Kettendruck</option>
+            <option value="chain">Kettendruck / Streifen</option>
             <option value="cutmark">Schnittmarke</option>
             <option value="cutmark-chain">Kettendruck + Marke</option>
           </select>
@@ -83,6 +83,7 @@
             <option value="off">Aus</option>
           </select>
         </label>
+        <p class="field-note">Bei mehreren Kopien mit Halbschnitt wird automatisch Kettendruck verwendet.</p>
 
         <div class="check-row">
           <label><input id="mobileBold" type="checkbox" checked> Fett</label>