Update opcode file reader to only apply changes lines with old version

- Also updates readme with this change
- And switch from minor_patch_diff vtable_diff in the recommended
  workfloww for minor patches

README.md

@@ -44,13 +44,12 @@ Pass `--help` to any of the scripts for usage.
 
 Example:
 ```sh
-python minor_patch_diff.py ffxiv_dx11.6.30.exe ffxiv_dx11.6.30h.exe > 6.30h.diff.json
+python vtable_diff.py ffxiv_dx11.6.30.exe ffxiv_dx11.6.30h.exe > 6.30h.diff.json
 ```
 
 Post-diff processing:
 ```sh
-python generate_opcodes_file.py 6.30h 6.30h.diff.json Ipcs.6.30h.h
-# TODO: Need a script to resolve opcodes for handlers with multiple opcodes
+python generate_opcodes_file.py 6.30 6.30h 6.30h.diff.json Ipcs.6.30h.h
 python generate_act_format.py Ipcs.6.30h.h
 ```
 
@@ -67,7 +66,7 @@ python traces_diff.py 6.28h-traces 6.30-traces 6.30.diff.json
 
 Post-diff processing:
 ```sh
-python generate_opcodes_file.py 6.30h 6.30h.diff.json Ipcs.6.30h.h
+python generate_opcodes_file.py 6.30 6.30h 6.30h.diff.json Ipcs.6.30h.h
 # TODO: Need a script to resolve opcodes for handlers with multiple opcodes
 python generate_act_format.py Ipcs.6.30h.h
 ```

generate_opcodes_file.py

@@ -27,32 +27,38 @@ def opcodes_str(opcodes):
         return "UNKNOWN"
 
 
-def replace_line_with_new_opcode(line, diff, ver):
-    match_groups = re.findall(r"^\s*([^\/].*)=\s*(.*),\s*\/\/.*$", line)
+def replace_line_with_new_opcode(line, diff, ver, old_ver):
+    match_groups = re.findall(
+        r"^(\s*[^\/]\w+\s*)=\s*(.*),(\s*)\/\/.*" + old_ver + "$", line
+    )
     if len(match_groups) != 1:
         return line
 
     opcode_name = match_groups[0][0]
     opcode_val = match_groups[0][1]
+    comment_spacing = match_groups[0][2]
     if " or " in opcode_val:
         old_opcode = int(opcode_val.split(" or ")[0], 16)
     else:
         old_opcode = int(opcode_val, 16)
     if old_opcode in diff:
         new_opcodes = diff[old_opcode]
-        return f"{opcode_name}= {opcodes_str(new_opcodes)}, // updated {ver}\n"
+        return f"{opcode_name}= {opcodes_str(new_opcodes)},{comment_spacing}// updated {ver}\n"
 
-    return f"// {line}"
+    return f"{line}"
 
 
 @click.command()
+@click.argument("old_version_string")
 @click.argument("new_version_string")
 @click.argument("diff_file", type=click.File("r"))
 @click.argument("opcodes_file", type=click.File("r"))
 @click.option(
     "--reverse", is_flag=True, help="Applies the diff file in the opposite direction"
 )
-def generate_opcodes_file(new_version_string, diff_file, opcodes_file, reverse):
+def generate_opcodes_file(
+    old_version_string, new_version_string, diff_file, opcodes_file, reverse
+):
     """
     Parses an OPCODES_FILE and applies a JSON DIFF_FILE to generate a new one.
     The opcodes file is basically anything that has syntax resembling Sapphire's
@@ -61,13 +67,18 @@ def generate_opcodes_file(new_version_string, diff_file, opcodes_file, reverse):
 
     Example:
 
-    python generate_opcodes_file.py 6.30h diff.json Ipcs.h
+    python generate_opcodes_file.py 6.30 6.30h diff.json Ipcs.h
     """
     diff = load_diff_file(diff_file, reverse)
     queued_lines = []
     for line in opcodes_file.readlines():
         queued_lines.append(
-            replace_line_with_new_opcode(line, diff, new_version_string)
+            replace_line_with_new_opcode(
+                line,
+                diff,
+                new_version_string,
+                old_version_string,
+            )
         )
 
     new_filename = f"{new_version_string}_opcodes.txt"