#!/usr/bin/env python3

import os
import shutil
import subprocess
from pathlib import Path

# On Gentoo, vanilla unpatched autotools are packaged separately.
# We place the vanilla names first as we want to prefer those if both exist.
autoconf_names = ['autoconf-vanilla-2.69', 'autoconf-2.69']
automake_names = ['automake-vanilla-1.15', 'automake-1.15.1']
aclocal_names = ['aclocal-vanilla-1.15', 'aclocal-1.15.1']
autoheader_names = ['autoheader-vanilla-2.69', 'autoheader-2.69']

# Pick the first for each list that exists on this system.
AUTOCONF_BIN = next(name for name in autoconf_names if shutil.which(name))
AUTOMAKE_BIN = next(name for name in automake_names if shutil.which(name))
ACLOCAL_BIN = next(name for name in aclocal_names if shutil.which(name))
AUTOHEADER_BIN = next(name for name in autoheader_names if shutil.which(name))

# autoconf-wrapper and automake-wrapper from Gentoo look at this environment variable.
# It's harmless to set it on other systems though.
ENV = f'WANT_AUTOCONF={AUTOCONF_BIN.split("-", 1)[1]} '
ENV += f'WANT_AUTOMAKE={AUTOMAKE_BIN.split("-", 1)[1]} '

ENV += f' AUTOCONF={AUTOCONF_BIN} '
ENV += f' ACLOCAL={ACLOCAL_BIN} '
ENV += f' AUTOMAKE={AUTOMAKE_BIN}'

# Directories we should skip entirely because they're vendored or have different
# autotools versions.
skip_dirs = [
    # readline and minizip are maintained with different autotools versions
    'readline',
    'minizip'
]

config_folders = []

for root, _, files in os.walk('.'):
    for file in files:
        if file == 'configure.ac':
            config_folders.append(Path(root).resolve())

for folder in sorted(config_folders):
    print(folder, flush=True)

    if folder.stem in skip_dirs:
        continue

    os.chdir(folder)

    configure_lines = open('configure.ac').read().splitlines()
    if any(True for line in configure_lines if line.startswith('AC_CONFIG_MACRO_DIRS')):
        # aclocal does not support the -f short option for force
        include_arg = ''
        include_arg2 = ''
        if (folder / '..' / 'config').is_dir():
            include_arg = '-I../config'

        # this is really a hack just for binutils-gdb/gprofng/libcollector
        # make sure that the order of includes is done as --enable-maintainer-mode
        if (folder / '..' / '..' / 'config').is_dir():
            include_arg = '-I../..'
            include_arg2 = '-I../../config'

        subprocess.check_output(f'{ENV} {ACLOCAL_BIN} --force {include_arg} {include_arg2}', shell=True, encoding='utf8')

    if ((folder / 'config.in').is_file()
        or any(True for line in configure_lines if line.startswith('AC_CONFIG_HEADERS'))):
        subprocess.check_output(f'{ENV} {AUTOHEADER_BIN} -f', shell=True, encoding='utf8')

    # apparently automake is somehow unstable -> skip it for gotools
    if (any(True for line in configure_lines if line.startswith('AM_INIT_AUTOMAKE'))
            and not str(folder).endswith('gotools')):
        subprocess.check_output(f'{ENV} {AUTOMAKE_BIN} -f',
                                shell=True, encoding='utf8')

    subprocess.check_output(f'{ENV} {AUTOCONF_BIN} -f', shell=True, encoding='utf8')