Add tool to generate zoneup opcodes if they are offset

Also only accept confident matches if the score is above 0

generate_diff_offset.py

@@ -0,0 +1,43 @@
+import click
+import json
+
+
+@click.command()
+@click.argument("diff_file", type=click.File("r"))
+@click.argument("offset", type=int)
+def generate_diff_offset(diff_file, offset):
+    """
+    Given a diff file, produces another diff file where the matches
+    are offset by OFFSET.
+
+    Example:
+    python generate_diff_offset.py -- diff.json -1 > offset.diff.json
+    """
+    diff_json = json.load(diff_file)
+    olds = []
+    news = []
+    for pair in diff_json:
+        if "old" not in pair or "new" not in pair:
+            continue
+        olds.append(pair["old"])
+        news.append(pair["new"])
+
+    if offset < 0:
+        news = [[] for _ in range(-offset)] + news
+    if offset > 0:
+        olds = [[] for _ in range(offset)] + olds
+
+    opcodes_object = []
+    for old, new in zip(olds, news):
+        opcodes_object.append(
+            {
+                "old": old,
+                "new": new,
+            }
+        )
+
+    print(json.dumps(opcodes_object, indent=2))
+
+
+if __name__ == "__main__":
+    generate_diff_offset()