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#!/usr/bin/env python3
"""
Generate a git-style patch that shows changes in decompilation between 2Ship (new)
and the official decomp repo (old).
"""
import difflib
import os
import sys
ZELDARET_URL = "https://raw.githubusercontent.com/zeldaret/mm/master/"
OLD_DISPLAY = "zeldaret/mm"
NEW_DISPLAY = "2Ship"
try:
# Prefer requests if available for nicer error handling
import requests
except Exception:
requests = None
import urllib.request
def read_file(path):
with open(path, "r", encoding="utf-8", errors="surrogateescape") as f:
return f.read().splitlines(keepends=False)
def fetch_url(url):
if requests:
r = requests.get(url)
r.raise_for_status()
return r.text.splitlines(keepends=False)
else:
with urllib.request.urlopen(url) as resp:
data = resp.read()
# decode with utf-8 fallback
text = data.decode("utf-8", errors="surrogateescape")
return text.splitlines(keepends=False)
def main():
if len(sys.argv) < 2:
print("Usage: python decomp_diff.py <local_file> [decomp_relative_path]", file=sys.stderr)
sys.exit(2)
local_path = sys.argv[1]
if not os.path.exists(local_path):
print(f"Local file not found: {local_path}", file=sys.stderr)
sys.exit(2)
if not local_path.endswith((".c", ".h")):
print("Can only compare .c and .h files", file=sys.stderr)
sys.exit(2)
# Read local file (new)
local_path = os.path.abspath(local_path)
new_lines = read_file(local_path)
repo_path = os.path.join(os.path.dirname(__file__), "mm")
relative_path = os.path.relpath(local_path, repo_path)
if len(sys.argv) > 2:
decomp_url = sys.argv[2]
else:
decomp_url = None
print(f"Comparing '{relative_path}' to{f" '{decomp_url}' in" if decomp_url else ""} zeldaret's decomp...")
if not decomp_url:
decomp_url = relative_path.replace("\\", "/")
# Read zeldaret file (old)
try:
old_lines = fetch_url(ZELDARET_URL + decomp_url)
except Exception as e:
print(f"Failed to fetch URL {ZELDARET_URL + decomp_url}: {e}", file=sys.stderr)
sys.exit(3)
# produce unified diff (old -> new)
patch_lines = list(difflib.unified_diff(old_lines, new_lines,
fromfile=f"{OLD_DISPLAY} ({decomp_url})",
tofile=f"{NEW_DISPLAY} ({relative_path})",
lineterm=""))
# append --- and +++ lines are already present in unified diff output; but ensure they exist
# if unified_diff returned an empty list and files are identical, print nothing
if not patch_lines:
print("No differences found.")
return
out_text = "\n".join(patch_lines) + "\n"
sys.stdout.write(out_text)
if __name__ == "__main__":
main()
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