gw convert: New option --reverse to reverse track data for flippy disks

src/greaseweazle/flux.py

@@ -130,6 +130,31 @@ def cue_at_index(self) -> None:
             self.sector_list = self.sector_list[1:]
 
 
+    def reverse(self) -> None:
+
+        assert self.sector_list is None
+
+        was_index_cued = self.index_cued
+        flux_sum = sum(self.list)
+
+        self.index_cued = False
+        self.list.reverse()
+        self.index_list.reverse()
+
+        to_index = flux_sum - sum(self.index_list)
+        if to_index <= 0:
+            if to_index < 0:
+                self.list.insert(0, -to_index)
+                flux_sum += -to_index
+            self.index_list = self.index_list[1:]
+            self.index_cued = True
+        else:
+            self.index_list[0] = to_index
+
+        if was_index_cued:
+            self.index_list.append(flux_sum - sum(self.index_list))
+
+
     def set_nr_revs(self, revs:int) -> None:
 
         self.cue_at_index()

src/greaseweazle/tools/convert.py

@@ -49,6 +49,10 @@ def process_input_track(
     if track is None:
         return None
 
+    if args.reverse:
+        track = track.flux()
+        track.reverse()
+
     if args.hard_sectors:
         track = track.flux()
         track.identify_hard_sectors()
@@ -132,6 +136,8 @@ def main(argv) -> None:
                         help="manual PLL parameter override")
     parser.add_argument("--hard-sectors", action="store_true",
                         help="convert index positions to hard sectors")
+    parser.add_argument("--reverse", action="store_true",
+                        help="reverse track data (flippy disk)")
     parser.add_argument("in_file", help="input filename")
     parser.add_argument("out_file", help="output filename")
     parser.description = description