Init

Author: RobotHanzo

.gitignore

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+.idea/
+.webassets-cache/
+*.min.css
+*.min.js
+*.pyc
+*.egg-info
+*.mo
+dist/
+build/

LICENSE

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+MIT License
+
+Copyright (c) 2025 RobotHanzo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+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,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# indico-plugin-price-adjustments
+
+This plugin provides registration price adjustment options for non-logged-in users.
+
+## Installation
+
+Install the plugin [package](https://pypi.org/project/indico-plugin-price-adjustments/) from PyPI
+```bash
+pip install indico-plugin-price-adjustments
+```
+
+Open `indico.conf` of your indico installation then add `price-adjustments` on `PLUGIN`.
+```python
+PLUGINS = { ... , 'price-adjustments'}
+```
+
+## Install for development for contributing to this plugin
+
+Clone this repository on `~/dev/indico/plugins`
+```bash
+git clone https://github.com/RobotHanzo/indico-plugin-price-adjustments.git
+```
+
+With python virtual environment of Indico development installation enabled, enter the cloned directory then run following command to install the plugin.
+```bash
+pip install -e .
+```
+
+Open `indico.conf` which should be located in `~/dev/indico/src/indico` then add `price-adjustments` on `PLUGIN`.
+```python
+PLUGINS = { ... , 'price-adjustments'}
+```
+
+You can now test you modification on your development indico environment.

indico_price_adjustments/__init__.py

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+from indico.util.i18n import make_bound_gettext
+
+
+_ = make_bound_gettext('price_adjustments')

indico_price_adjustments/plugin.py

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+from indico.core.plugins import IndicoPlugin
+from indico.modules.events.registration.controllers import RegistrationFormMixin
+from indico.modules.events.registration.forms import RegistrationFormEditForm, _check_if_payment_required
+from indico_patcher import patch
+from wtforms.fields import DecimalField
+from wtforms.validators import Optional, NumberRange
+from wtforms.widgets import NumberInput
+from indico.core.db import db
+
+from indico_price_adjustments import _
+
+
+@patch(RegistrationFormEditForm)
+class _RegistrationFormEditFormMixin:
+    _price_fields = ('currency', 'base_price', 'extra_fee_for_guests')
+    extra_fee_for_guests = DecimalField(_('Extra fee for guests'),
+                                               [NumberRange(min=-999999999.99, max=999999999.99), Optional(),
+                                                _check_if_payment_required],
+                                               filters=[lambda x: x if x is not None else 0],
+                                               widget=NumberInput(step='0.01'),
+                                               description=_(
+                                                   'An extra fee guests(non-logged-in users) have to pay when registering, negative amounts supported.'))
+
+@patch(RegistrationFormMixin)
+class _RegistrationFormMixin:
+    extra_fee_for_guests = db.Column(
+        db.Numeric(11, 2),  # max. 999999999.99
+        nullable=False,
+        default=0
+    )
+
+
+class PriceAdjustmentsPlugin(IndicoPlugin):
+    """Price Adjustments
+
+    Provides registration price adjustment options for non-logged-in users.
+    """
+    configurable = False
+
+    def init(self):
+        super().init()
+        # self.inject_bundle('main.css', WPManageRegistration)

pyproject.toml

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+[project]
+name = 'indico-price-adjustments'
+description = 'Price adjustments for logged in users'
+readme = 'README.md'
+version = '1.0'
+license = {text = "MIT License"}
+authors = [{ name = 'RobotHanzo', email = 'admin@robothanzo.dev' }]
+classifiers = [
+    'Environment :: Plugins',
+    'Environment :: Web Environment',
+    'Programming Language :: Python :: 3.12',
+]
+requires-python = '>=3.12, <3.13'
+dependencies = ['indico>=3.3', 'pygments>=2.7.2,<3', 'indico-patcher>=0.2.1']
+
+[project.urls]
+GitHub = 'https://github.com/indico/indico-plugins'
+
+[project.entry-points.'indico.plugins']
+price_adjustments = 'indico_price_adjustments.plugin:PriceAdjustmentsPlugin'
+
+[build-system]
+requires = ['hatchling==1.27.0']
+build-backend = 'hatchling.build'
+
+[tool.hatch.build]
+packages = ['indico_price_adjustments']
+exclude = [
+    '*.no-header',
+    '.keep',
+    # exclude original client sources (they are all included in source maps anyway)
+    'indico_*/client/',
+    # no need for tests outside development
+    'test_snapshots/',
+    'tests/',
+    '*_test.py',
+]
+artifacts = [
+    'indico_*/translations/**/messages-react.json',
+    'indico_*/translations/**/*.mo',
+    'indico_*/static/dist/',
+]