#!/usr/bin/env python3
# Copyright © 2019 Intel Corporation

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# of this software and associated documentation files (the "Software"), to deal
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# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# SOFTWARE.

"""This script reads a meson build directory and gives back the command line it
was configured with.

This only works for meson 0.49.0 and newer.
"""

import argparse
import ast
import configparser
import pathlib
import sys


def parse_args() -> argparse.Namespace:
    """Parse arguments."""
    parser = argparse.ArgumentParser()
    parser.add_argument(
        'build_dir',
        help='Path the meson build directory')
    args = parser.parse_args()
    return args


def load_config(path: pathlib.Path) -> configparser.ConfigParser:
    """Load config file."""
    conf = configparser.ConfigParser()
    with path.open() as f:
        conf.read_file(f)
    return conf


def build_cmd(conf: configparser.ConfigParser) -> str:
    """Rebuild the command line."""
    args = []
    for k, v in conf['options'].items():
        if ' ' in v:
            args.append(f'-D{k}="{v}"')
        else:
            args.append(f'-D{k}={v}')

    cf = conf['properties'].get('cross_file')
    if cf:
        args.append('--cross-file={}'.format(cf))
    nf = conf['properties'].get('native_file')
    if nf:
        # this will be in the form "['str', 'str']", so use ast.literal_eval to
        # convert it to a list of strings.
        nf = ast.literal_eval(nf)
        args.extend(['--native-file={}'.format(f) for f in nf])
    return ' '.join(args)


def main():
    args = parse_args()
    path = pathlib.Path(args.build_dir, 'meson-private', 'cmd_line.txt')
    if not path.exists():
        print('Cannot find the necessary file to rebuild command line. '
              'Is your meson version >= 0.49.0?', file=sys.stderr)
        sys.exit(1)

    conf = load_config(path)
    cmd = build_cmd(conf)
    print(cmd)


if __name__ == '__main__':
    main()