#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright 2023 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.

"""Generate a Markdown document listing gallery-dl's command-line arguments"""

import os
import re

import util
from gallery_dl import option


TEMPLATE = """# Command-Line Options

<!-- auto-generated by {} -->

<table>
<thead>
<tr>
    <th></th>
    <th width="26%"></th>
    <th></th>
</tr>
</thead>
<tbody valign="top">
{}
</tbody>
</table>
"""


tbody = []
append = tbody.append
sub = re.compile(r"'([^']+)'").sub

for group in option.build_parser()._action_groups[2:]:

    append('\n<tr>\n    <td colspan="3"><strong>' +
           group.title + '</strong></td>\n</tr>')

    for action in group._group_actions:
        help = action.help
        if help == "==SUPPRESS==":
            continue

        try:
            short, long = action.option_strings
        except ValueError:
            try:
                long = action.option_strings[0]
            except IndexError:
                continue
            short = ""

        if short:
            short = "<code>" + short + "</code>"
        if long:
            long = '<code>' + long + "</code>"

        append("<tr>")
        append("    <td>" + short + "</td>")
        append("    <td>" + long + "</td>")
        append("    <td>" + sub("<code>\\1</code>", help) + "</td>")
        append("</tr>")


with open(util.path("docs", "options.md"), "w", encoding="utf-8") as fp:
    fp.write(TEMPLATE.format(
        "/".join(os.path.normpath(__file__).split(os.sep)[-2:]),
        "\n".join(tbody),
    ))