initial commit

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diff --git a/src/hydrilla_website/__init__.py b/src/hydrilla_website/__init__.py
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+++ b/src/hydrilla_website/__init__.py
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+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+from .app import website_app
diff --git a/src/hydrilla_website/__main__.py b/src/hydrilla_website/__main__.py
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index 0000000..ad71c06
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+++ b/src/hydrilla_website/__main__.py
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+# SPDX-License-Identifier: CC0-1.0
+
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+
+from .app import website_app
+
+website_app.run()
diff --git a/src/hydrilla_website/app.py b/src/hydrilla_website/app.py
new file mode 100644
index 0000000..84303c3
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+++ b/src/hydrilla_website/app.py
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+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# Hydrilla&Haketilo website logic.
+#
+# Copyright (C) 2021, 2022 Wojtek Kosior
+#
+# This program 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.
+#
+# This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+#
+# I, Wojtek Kosior, thereby promise not to sue for violation of this
+# file's license. Although I request that you do not make use of this
+# code in a proprietary program, I am not going to enforce this in
+# court.
+
+import gettext
+import dataclasses as dc
+import typing as t
+
+from pathlib import Path
+
+import flask
+import jinja2
+
+from . import common_jinja_templates
+
+
+here = Path(__file__).resolve().parent
+
+
+supported_languages = {'en_US'}
+default_locale = 'en_US'
+
+
+def choose_locale() -> None:
+    app = t.cast(HydrillaWebsite, flask.current_app)
+    best_locale_match = flask.request.accept_languages.best_match(
+        supported_languages,
+        default = default_locale
+    )
+    if best_locale_match is None:
+        app._hydrilla_request_locale = default_locale
+    else:
+        app._hydrilla_request_locale = best_locale_match
+
+    translations = gettext.translation(
+        'messages',
+        localedir = here / 'locales',
+        languages = [app._hydrilla_request_locale]
+    )
+
+    app.jinja_env.install_gettext_translations(translations)
+
+
+@dc.dataclass(init=False)
+class HydrillaWebsite(flask.Flask):
+    _hydrilla_request_locale: str
+
+    def __init__(self) -> None:
+        super().__init__(__name__)
+
+        loaders = [jinja2.PackageLoader(__package__)]
+        combined_loader = common_jinja_templates.combine_with_loaders(loaders)
+
+        self.jinja_options = {
+            **self.jinja_options,
+            'loader':        combined_loader,
+            'autoescape':    jinja2.select_autoescape(['.jinja']),
+            'lstrip_blocks': True,
+            'extensions': [
+                *self.jinja_options.get('extensions', []),
+                'jinja2.ext.i18n',
+                'jinja2.ext.do'
+            ]
+        }
+
+        self.before_request(choose_locale)
+
+website_app = HydrillaWebsite()
+
+@website_app.route('/', methods=['GET'])
+def main() -> str:
+    return flask.render_template('index.html.jinja')
diff --git a/src/hydrilla_website/common_jinja_templates b/src/hydrilla_website/common_jinja_templates
new file mode 160000
+Subproject 0e8ab5c2735b94166552ce80c18e523357a048a
diff --git a/src/hydrilla_website/locales/en_US/LC_MESSAGES/messages.po b/src/hydrilla_website/locales/en_US/LC_MESSAGES/messages.po
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index 0000000..eb9d5e4
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+++ b/src/hydrilla_website/locales/en_US/LC_MESSAGES/messages.po
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+# SPDX-License-Identifier: CC0-1.0
+# English translations for Hydrilla&Haketilo website.
+#
+# Copyright (C) 2021-2022 Wojtek Kosior <koszko@koszko.org>
+# Available under the terms of Creative Commons Zero v1.0 Universal.
+msgid ""
+msgstr ""
+"Project-Id-Version: hydrilla_website 0.1.dev0+d20221029\n"
+"Report-Msgid-Bugs-To: koszko@koszko.org\n"
+"POT-Creation-Date: 2022-10-29 13:24+0200\n"
+"PO-Revision-Date: 2022-10-29 13:18+0200\n"
+"Last-Translator: Wojtek Kosior <koszko@koszko.org>\n"
+"Language: en_US\n"
+"Language-Team: en_US <koszko@koszko.org>\n"
+"Plural-Forms: nplurals=2; plural=(n != 1)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Babel 2.9.0\n"
+
+#: src/hydrilla_website/templates/index.html.jinja:23
+msgid "index.title"
+msgstr "Main page"
+
+#: src/hydrilla_website/templates/index.html.jinja:27
+msgid "index.h_big.welcome_to_haketilo"
+msgstr "Welcome to Haketilo"
+
+#: src/hydrilla_website/templates/website_base.html.jinja:20
+msgid "base.title.haketilo"
+msgstr "Haketilo&Hydrilla"
+
diff --git a/src/hydrilla_website/py.typed b/src/hydrilla_website/py.typed
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+++ b/src/hydrilla_website/py.typed
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+SPDX-License-Identifier: CC0-1.0
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
diff --git a/src/hydrilla_website/templates/index.html.jinja b/src/hydrilla_website/templates/index.html.jinja
new file mode 100644
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+++ b/src/hydrilla_website/templates/index.html.jinja
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+{#
+SPDX-License-Identifier: GPL-3.0-or-later OR CC-BY-SA-4.0
+
+Website main page.
+
+This file is part of Hydrilla&Haketilo website.
+
+Copyright (C) 2022 Wojtek Kosior
+
+Dual licensed under
+* GNU General Public License v3.0 or later and
+* Creative Commons Attribution Share Alike 4.0 International.
+
+You can choose to use either of these licenses or both.
+
+
+I, Wojtek Kosior, thereby promise not to sue for violation of this
+file's licenses. Although I request that you do not make use of this
+code in a proprietary work, I am not going to enforce this in court.
+#}
+{% extends "website_base.html.jinja" %}
+
+{% block title %} {{ _('index.title') }} {% endblock %}
+
+{% block main %}
+  <h3>
+    {{ _('index.h_big.welcome_to_haketilo') }}
+  </h3>
+{% endblock %}
diff --git a/src/hydrilla_website/templates/website_base.html.jinja b/src/hydrilla_website/templates/website_base.html.jinja
new file mode 100644
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+++ b/src/hydrilla_website/templates/website_base.html.jinja
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+{#
+SPDX-License-Identifier: CC0-1.0
+
+Proxy web UI base page template.
+
+This file is part of Hydrilla&Haketilo.
+
+Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+
+Available under the terms of Creative Commons Zero v1.0 Universal.
+#}
+{% extends "base.html.jinja" %}
+
+{% block head %}
+  {{ super() }}
+
+  <title>
+    {% block title required %}{% endblock %}
+    -
+    {{ _('base.title.haketilo') }}
+  </title>
+{% endblock head %}
+
+{% block style %}
+  {{ super() }}
+{% endblock style %}