Add changelog links fixer

tools/fix_changelog.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+import argparse
+import re
+import sys
+from pathlib import Path
+
+
+PATTERN = re.compile("\(#(\d+)\)")
+
+
+def get_root(script_path):
+    folder = script_path.absolute().parent
+    while not (folder / '.git').exists():
+        folder = folder.parent
+        if folder == folder.anchor:
+            raise RuntimeError("git repo not found")
+    return folder
+
+
+def main(argv):
+    parser = argparse.ArgumentParser(description='Expand github links.')
+    parser.add_argument('filename', default='CHANGES.rst', nargs='?',
+                        help="filename to proess")
+    args = parser.parse_args()
+    here = Path(argv[0])
+    root = get_root(here)
+    fname = root / args.filename
+
+    content = fname.read_text()
+    new = PATTERN.sub(
+        r'(`#\1 <https://github.com/aio-libs/aiohttp/pull/\1>`_)',
+        content)
+
+    fname.write_text(new)
+    print(f"Fixed links in {fname}")
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))