flatten @path/to/file.rsp entries in compile_commands.json file so that it can be used by clangd

expand-compile-commands-json.py

import argparse
import json
import copy
import sys
import os.path
import traceback


def parse_args():
    parser = argparse.ArgumentParser(
        description="Expand compile_commands.json file")

    parser.add_argument("--json", type=str, metavar="arg", required=True,
                        help="path to compile_commands.json file")
    parser.add_argument("--result", type=str, metavar="arg", required=True,
                        help="path to a new compile_commands.json file")

    args = parser.parse_args()

    return args


def main():
    try:
        args = parse_args()

        base_dir = os.path.split(args.json)[0]
        data = open(args.json, "r")
        js = json.load(data)
        new_js = []

        for entry in js:
            new_entry = copy.deepcopy(entry)
            cmd = entry["command"]
            new_cmd = []
            items = [entry for entry in cmd.split(" ") if entry]
            for item in items:
                if item.startswith("@") and item.endswith(".rsp"):
                    rsp = open(os.path.join(base_dir, item[1:]), "r")
                    lines = " ".join([l.strip() for l in rsp.readlines()])
                    new_cmd.append(lines)
                else:
                    new_cmd.append(item)
            new_entry["command"] = " ".join(new_cmd)
            new_js.append(new_entry)

        result = open(args.result, "w")
        result.write(json.dumps(new_js, indent=2))
    except Exception as exc:
        print(exc, file=sys.stderr)
        print("===", file=sys.stderr)
        print(traceback.format_exc(), file=sys.stderr)
        sys.exit(-1)


if __name__ == "__main__":
    main()