GenericWriter: Create scheme for dynamic variable value creation

pyembroidery/GenericWriter.py

@@ -459,6 +459,10 @@ class GenericWriter:
 
             # MAIN CODE, there is something to write.
             if write_segment is not None:
+                if isinstance(write_segment, dict):
+                    key, default = write_segment[None]
+                    key = key.format_map(self.format_dictionary)
+                    write_segment = write_segment.get(key,default)
                 self.update_positions(self.x, self.y, self.cmd)
                 if self.cmd == SEQUIN_MODE:
                     self.open_document()

test/pattern_for_tests.py

@@ -211,7 +211,6 @@ def get_long_jump():
     return pattern
 
 
-
 def get_simple_pattern():
     pattern = EmbPattern()
     pattern.add_block([(0, 0), (0, 100), (100, 100), (100, 0), (0, 0)], "red")