feat: add several options for customizing label placement

* --row-wise, for going left to right instead of top to bottom
* --num-labels, for specifying how many labels to print
* --pages, for specifying how many pages to print
* --start-position, for continuing on sheets where some labels were already used

Co-authored-by: Jan Christian Grünhage <jan.christian@gruenhage.xyz>

paperless_asn_qr_codes/avery_labels.py

@@ -89,7 +89,9 @@ BUSINESS_CARDS = 5371
 
 
 class AveryLabel:
-    def __init__(self, label, debug, **kwargs):
+    def __init__(self, label, debug,
+                 topDown=True, start_pos=None,
+                 **kwargs):
         data = labelInfo[label]
         self.across = data.labels_horizontal
         self.down = data.labels_vertical
@@ -99,10 +101,27 @@ class AveryLabel:
             self.size[1] + data.gutter_size[1],
         )
         self.margins = data.margin
-        self.topDown = True
+        self.topDown = topDown
         self.debug = debug
         self.pagesize = data.pagesize
-        self.position = 0
+
+        #Calculate start offset
+        if isinstance(start_pos, tuple):
+            rows, columns = start_pos
+            # Minimum Value 1 for row/column
+            rows = max(rows, 1)
+            columns = max(columns, 1)
+            if self.topDown:
+                offset = (columns - 1) * self.down + rows - 1
+            else:
+                offset = (rows - 1) * self.across + columns - 1
+        elif start_pos:
+            offset = start_pos - 1
+        else:
+            offset = 0
+        # Limit start position to number of labels - 1
+        self.position = min(offset,  self.across * self.down - 1)
+
         self.__dict__.update(kwargs)
 
     def open(self, filename):