austax: Reorganise code structure
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libdrcr/plugins/austax/calc.luau
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46
libdrcr/plugins/austax/calc.luau
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@ -0,0 +1,46 @@
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--!strict
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-- DrCr: Web-based double-entry bookkeeping framework
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-- Copyright (C) 2022-2025 Lee Yingtong Li (RunasSudo)
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <https://www.gnu.org/licenses/>.
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local libdrcr = require('../libdrcr')
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local tax_tables = require('../austax/tax_tables')
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local calc = {}
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function calc.base_income_tax(net_taxable: number, context: libdrcr.ReportingContext): number
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local year, _, _ = libdrcr.parse_date(context.eofy_date)
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local base_tax_table = tax_tables.base_tax[year]
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for i, row in ipairs(base_tax_table) do
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local upper_limit = row[1] * (10 ^ context.dps)
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local flat_amount = row[2] * (10 ^ context.dps)
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local marginal_rate = row[3]
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-- Lower limit is the upper limit of the preceding bracket
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local lower_limit = 0
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if i > 1 then
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lower_limit = base_tax_table[i - 1][1] * (10 ^ context.dps)
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end
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if net_taxable <= upper_limit then
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return flat_amount + marginal_rate * (net_taxable - lower_limit)
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end
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end
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error('Taxable income not within any tax bracket')
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end
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return calc
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28
libdrcr/plugins/austax/plugin.luau
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28
libdrcr/plugins/austax/plugin.luau
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@ -0,0 +1,28 @@
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--!strict
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-- DrCr: Web-based double-entry bookkeeping framework
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-- Copyright (C) 2022-2025 Lee Yingtong Li (RunasSudo)
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <https://www.gnu.org/licenses/>.
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local libdrcr = require('../libdrcr')
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local reporting = require('../austax/reporting')
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local plugin: libdrcr.Plugin = {
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name = 'austax',
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reporting_steps = {
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reporting.CalculateIncomeTax
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},
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}
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return plugin
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@ -16,34 +16,17 @@
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-- along with this program. If not, see <https://www.gnu.org/licenses/>.
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local libdrcr = require('../libdrcr')
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local account_kinds = require('../austax/account_kinds')
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local tax_tables = require('../austax/tax_tables')
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local calc = require('../austax/calc')
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function get_base_income_tax(net_taxable: number, context: libdrcr.ReportingContext): number
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local year, _, _ = libdrcr.parse_date(context.eofy_date)
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local base_tax_table = tax_tables.base_tax[year]
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for i, row in ipairs(base_tax_table) do
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local upper_limit = row[1] * (10 ^ context.dps)
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local flat_amount = row[2] * (10 ^ context.dps)
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local marginal_rate = row[3]
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-- Lower limit is the upper limit of the preceding bracket
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local lower_limit = 0
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if i > 1 then
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lower_limit = base_tax_table[i - 1][1] * (10 ^ context.dps)
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end
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if net_taxable <= upper_limit then
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return flat_amount + marginal_rate * (net_taxable - lower_limit)
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end
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end
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error('Taxable income not within any tax bracket')
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end
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local reporting = {}
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function requires(args, context)
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reporting.CalculateIncomeTax = {
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name = 'CalculateIncomeTax',
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product_kinds = {'DynamicReport', 'Transactions'},
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} :: libdrcr.ReportingStep
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function reporting.CalculateIncomeTax.requires(args, context)
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return {
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{
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name = 'CombineOrdinaryTransactions',
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@ -53,7 +36,7 @@ function requires(args, context)
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}
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end
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function after_init_graph(args, steps, add_dependency, context)
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function reporting.CalculateIncomeTax.after_init_graph(args, steps, add_dependency, context)
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for _, other in ipairs(steps) do
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if other.name == 'AllTransactionsExceptEarningsToEquity' then
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-- AllTransactionsExceptEarningsToEquity depends on CalculateIncomeTax
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@ -75,7 +58,7 @@ function after_init_graph(args, steps, add_dependency, context)
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end
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end
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function execute(args, context, kinds_for_account, get_product)
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function reporting.CalculateIncomeTax.execute(args, context, kinds_for_account, get_product)
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-- Get balances for current year
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local product = get_product({
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name = 'CombineOrdinaryTransactions',
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@ -208,7 +191,7 @@ function execute(args, context, kinds_for_account, get_product)
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table.insert(report.entries, 'Spacer')
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-- Base income tax row
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local tax_base = get_base_income_tax(net_taxable, context)
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local tax_base = calc.base_income_tax(net_taxable, context)
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table.insert(report.entries, { Row = {
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text = 'Base income tax',
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quantity = {tax_base},
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@ -338,17 +321,4 @@ function entries_subtotal(entries: {libdrcr.DynamicReportEntry}): number
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return subtotal
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end
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local plugin: libdrcr.Plugin = {
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name = 'austax',
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reporting_steps = {
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{
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name = 'CalculateIncomeTax',
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product_kinds = {'DynamicReport', 'Transactions'},
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requires = requires,
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after_init_graph = after_init_graph,
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execute = execute,
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}
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},
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}
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return plugin
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return reporting
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@ -39,7 +39,7 @@ async fn main() {
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let mut context = ReportingContext::new(
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db_connection,
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"plugins".to_string(),
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vec!["austax.austax".to_string()],
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vec!["austax.plugin".to_string()],
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NaiveDate::from_ymd_opt(2025, 6, 30).unwrap(),
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"$".to_string(),
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);
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@ -44,7 +44,7 @@ fn prepare_reporting_context(context: &mut ReportingContext) {
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fn get_plugins() -> Vec<String> {
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// FIXME: Dynamically get this
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vec!["austax.austax".to_string()]
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vec!["austax.plugin".to_string()]
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}
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pub(crate) async fn get_report(
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