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# Package initialization
# Copyright (C) 2022-2023  Nguyễn Gia Phong
#
# This file is part of rub.
#
# Rub is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Rub is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with rub.  If not, see <https://www.gnu.org/licenses/>.

from functools import cached_property
from os import walk
from pathlib import Path
from shutil import copytree, rmtree

from rub import xml

__all__ = ['Rubber', 'xml']


def glob_files(root: Path, suffix=''):
    """Return the list of all files in given directory, recursively."""
    return [Path(path).relative_to(root)/file
            for path, dirs, files in walk(root)
            for file in files if file.endswith(suffix)]


def replace(source: Path, destination: Path):
    """Replace destination with source directory."""
    rmtree(destination, ignore_errors=True)
    copytree(source, destination, dirs_exist_ok=True)


class Rubber:
    """Static generator."""

    def __init__(self, generate_article, base, src, cache, out):
        self.generate_article = generate_article
        self.base, self.src = base, src
        self.cache, self.out = cache, out

    @cached_property
    def tasks(self):
        def assox():
            for k in dir(self):
                if not k.startswith('task_'): continue
                v = getattr(self, k)
                if callable(v): yield k, v

        return dict(assox())

    def task_base(self):
        paths = glob_files(self.base)
        return {'doc': 'copy base directory',
                'file_dep': [self.base/path for path in paths],
                'actions': [(replace, [self.base, self.out])],
                'targets': [self.out/path for path in paths],
                'clean': True}

    def task_articles(self):
        """process articles into XHTML"""
        for path in glob_files(self.src, '.xml'):
            source = self.src / path
            destination = self.out / path
            yield {'name': path, 'doc': f'process {path} into XHTML',
                   'file_dep': [source],
                   'actions': [(self.generate_article, [source, destination])],
                   'targets': [destination], 'clean': True}