Add diffing utility for minor patches

utils.py

@@ -0,0 +1,32 @@
+import sys
+import time
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+def create_r2_byte_pattern(sig):
+  tokens = sig.split()
+  r2_tokens = []
+  for token in tokens:
+    if token == "?":
+      r2_tokens.append("..")
+    else:
+      r2_tokens.append(token)
+  return "".join(r2_tokens)
+
+def sync_r2_output(r2):
+  """
+  For some fucking reason r2pipe output gets desynced from the start,
+  making the result of every command what the previous command should
+  have returned.
+
+  Read stuff from the process pipe until it stops being stupid.
+  """
+  for i in range(10):
+    p = r2.process.stdout.read(1)
+    if len(p) > 0:
+      break
+    time.sleep(1)
+  output = r2.cmd(f"?vi 123").strip()
+  if output != "123":
+    raise Exception("R2 state never got synced")