Script for GO files to add msgpack struct tags to every struct that has a Json tag.

add_msgpack_struct_tags.py

import re
import sys


def add_new_text(filename):
    with open(filename, "r") as file:
        data = file.readlines()

        pattern = re.compile(r'json:"([\w,]+)"')

    new_data = []
    for line in data:
        match = re.search(pattern, line)
        if match:
            new_line = line.replace(
                match.group(), f'{match.group()} msgpack:"{match.group(1)}"'
            )
            new_data.append(new_line)
        else:
            new_data.append(line)

    with open(filename, "w") as file:
        file.writelines(new_data)


if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("usage: python script.py <filename>")
        sys.exit(1)

    add_new_text(sys.argv[1])
    print(f"Added msgpack tags to {sys.argv[1]}")

to run for every file in the repository with ripgrep and xargs:

rg -iPlg '*.go' 'json:"' . | xargs -L 1 python add_msgpack_struct_tags.py