#!/usr/bin/env python
from subprocess import check_call
from os.path import split, splitext, join
import os

if __name__ == '__main__':
    import argparse

    parser = argparse.ArgumentParser("script to convert full GENIE root files to the reduced gst ROOT format")
    parser.add_argument("filenames", nargs="+", help="GENIE root files")
    parser.add_argument("--dest", required=True, help="destination directory")
    args = parser.parse_args()

    for filename in args.filenames:
        head, tail = split(filename)
        root, ext = splitext(tail)
        output = join(args.dest, root) + ".ntuple.root"
        cmd = ["gntpc","-f","gst","-i",filename,"-o",output]
        print(" ".join(cmd))
        with open(os.devnull,"w") as devnull:
            check_call(cmd, stdout=devnull, stderr=devnull)