Stub implementation of Lua plugins

libdrcr/Cargo.lock

@@ -109,6 +109,16 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "bstr"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "234113d19d0d7d613b40e86fb654acf958910802bcceab913a4f9e7cda03b1a4"
+dependencies = [
+ "memchr",
+ "serde",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.17.0"
@@ -293,6 +303,16 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "erased-serde"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e004d887f51fcb9fef17317a2f3525c887d8aa3f4f50fed920816a688284a5b7"
+dependencies = [
+ "serde",
+ "typeid",
+]
+
 [[package]]
 name = "etcetera"
 version = "0.8.0"
@@ -680,12 +700,23 @@ dependencies = [
  "downcast-rs",
  "dyn-clone",
  "indexmap",
+ "mlua",
  "serde",
  "serde_json",
  "sqlx",
  "tokio",
 ]
 
+[[package]]
+name = "libloading"
+version = "0.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07033963ba89ebaf1584d767badaa2e8fcec21aedea6b8c0346d487d49c28667"
+dependencies = [
+ "cfg-if",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "libm"
 version = "0.2.15"
@@ -725,6 +756,15 @@ version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
 
+[[package]]
+name = "luau0-src"
+version = "0.12.3+luau663"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76ae337c644bbf86a8d8e9ce3ee023311833d41741baf5e51acc31b37843aba1"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "md-5"
 version = "0.10.6"
@@ -761,6 +801,37 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "mlua"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1f5f8fbebc7db5f671671134b9321c4b9aa9adeafccfd9a8c020ae45c6a35d0"
+dependencies = [
+ "bstr",
+ "either",
+ "erased-serde",
+ "libloading",
+ "mlua-sys",
+ "num-traits",
+ "parking_lot",
+ "rustc-hash",
+ "rustversion",
+ "serde",
+ "serde-value",
+]
+
+[[package]]
+name = "mlua-sys"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380c1f7e2099cafcf40e51d3a9f20a346977587aa4d012eae1f043149a728a93"
+dependencies = [
+ "cc",
+ "cfg-if",
+ "luau0-src",
+ "pkg-config",
+]
+
 [[package]]
 name = "num-bigint-dig"
 version = "0.8.4"
@@ -823,6 +894,15 @@ version = "1.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
 
+[[package]]
+name = "ordered-float"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f19d67e5a2795c94e73e0bb1cc1a7edeb2e28efd39e2e1c9b7a40c1108b11c"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "parking"
 version = "2.2.1"
@@ -1007,6 +1087,12 @@ version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
+[[package]]
+name = "rustc-hash"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
+
 [[package]]
 name = "rustversion"
 version = "1.0.20"
@@ -1034,6 +1120,16 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-value"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a1a3341211875ef120e117ea7fd5228530ae7e7036a779fdc9117be6b3282c"
+dependencies = [
+ "ordered-float",
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.219"
@@ -1513,6 +1609,12 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "typeid"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc7d623258602320d5c55d1bc22793b57daff0ec7efc270ea7d55ce1d5f5471c"
+
 [[package]]
 name = "typenum"
 version = "1.18.0"

libdrcr/Cargo.toml

@@ -9,6 +9,7 @@ chrono = "0.4.41"
 downcast-rs = "2.0.1"
 dyn-clone = "1.0.19"
 indexmap = "2.9.0"
+mlua = { version = "0.10", features = ["luau", "serialize"] }
 serde = "1.0.219"
 serde_json = "1.0.140"
 sqlx = { version = "0.8", features = [ "runtime-tokio", "sqlite" ] }

libdrcr/plugins/austax/austax.luau

@@ -0,0 +1,43 @@
+--!strict
+--  DrCr: Web-based double-entry bookkeeping framework
+--  Copyright (C) 2022-2025  Lee Yingtong Li (RunasSudo)
+--
+--  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/>.
+
+local libdrcr = require("../libdrcr")
+
+function requires(step_name, product_kinds, args)
+	return {}
+end
+
+function execute(step_name, product_kinds, args)
+	print("Stub: Lua plugin execute")
+	return {}
+end
+ 
+local plugin: libdrcr.Plugin = {
+	spec = {
+		name = "austax",
+		reporting_steps = {
+			{
+				name = "CalculateIncomeTax",
+				product_kinds = {"DynamicReport", "Transactions"}
+			}
+		},
+	},
+	requires = requires,
+	execute = execute,
+}
+
+return plugin

libdrcr/plugins/libdrcr.luau

@@ -0,0 +1,57 @@
+--!strict
+--  DrCr: Web-based double-entry bookkeeping framework
+--  Copyright (C) 2022-2025  Lee Yingtong Li (RunasSudo)
+--
+--  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/>.
+
+------------------------
+-- Plugin specific types
+
+-- Represents a libdrcr plugin specification and implementation
+export type Plugin = {
+	spec: PluginSpec,
+	requires: (string, {ReportingProductKind}, ReportingStepArgs) -> {ReportingProductId},
+	execute: (string, {ReportingProductKind}, ReportingStepArgs) -> {ReportingProduct},
+}
+
+-- Represents a libdrcr plugin specification
+export type PluginSpec = {
+	name: string,
+	reporting_steps: {ReportingStepSpec},
+}
+
+-- Specifies a ReportingStep provided by the plugin
+export type ReportingStepSpec = {
+	name: string,
+	product_kinds: {ReportingProductKind}
+}
+
+-------------------------
+-- libdrcr internal types
+
+export type ReportingProduct = any
+
+export type ReportingProductId = {
+	name: string,
+	kind: ReportingProductKind,
+	args: ReportingStepArgs,
+}
+
+export type ReportingProductKind = string
+
+-- TODO: Currently only VoidArgs is supported
+export type ReportingStepArgs = string
+
+local libdrcr = {}
+return libdrcr

libdrcr/src/lib.rs

@@ -1,7 +1,8 @@
 pub mod account_config;
-pub mod austax;
+//pub mod austax;
 pub mod db;
 pub mod model;
+pub mod plugin;
 pub mod reporting;
 pub mod serde;
 pub mod util;

libdrcr/src/main.rs

@@ -38,12 +38,14 @@ async fn main() {
 	// Initialise ReportingContext
 	let mut context = ReportingContext::new(
 		db_connection,
+		"plugins".to_string(),
+		vec!["austax.austax".to_string()],
 		NaiveDate::from_ymd_opt(2025, 6, 30).unwrap(),
 		"$".to_string(),
 	);
+	libdrcr::plugin::register_lookup_fns(&mut context);
 	libdrcr::reporting::steps::register_lookup_fns(&mut context);
 	libdrcr::reporting::builders::register_dynamic_builders(&mut context);
-	libdrcr::austax::register_lookup_fns(&mut context);
 
 	let context = Arc::new(context);
 
@@ -109,16 +111,16 @@ async fn main() {
 		.await
 		.unwrap();
 
-	let result = products
+	// let result = products
-		.get_or_err(&ReportingProductId {
+	// 	.get_or_err(&ReportingProductId {
-			name: "CalculateIncomeTax".to_string(),
+	// 		name: "CalculateIncomeTax".to_string(),
-			kind: ReportingProductKind::DynamicReport,
+	// 		kind: ReportingProductKind::DynamicReport,
-			args: ReportingStepArgs::VoidArgs,
+	// 		args: ReportingStepArgs::VoidArgs,
-		})
+	// 	})
-		.unwrap();
+	// 	.unwrap();
 
-	println!("Tax summary:");
+	// println!("Tax summary:");
-	println!("{:?}", result);
+	// println!("{:?}", result);
 
 	let result = products
 		.get_or_err(&ReportingProductId {

libdrcr/src/plugin.rs

@@ -0,0 +1,216 @@
+/*
+	DrCr: Web-based double-entry bookkeeping framework
+	Copyright (C) 2022-2025  Lee Yingtong Li (RunasSudo)
+
+	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/>.
+*/
+
+use std::fmt::Display;
+
+use async_trait::async_trait;
+use mlua::{Function, Lua, LuaSerdeExt, Table, Value};
+use serde::{Deserialize, Serialize};
+use tokio::sync::RwLock;
+
+use crate::reporting::calculator::ReportingGraphDependencies;
+use crate::reporting::executor::ReportingExecutionError;
+use crate::reporting::types::{
+	ReportingContext, ReportingProductId, ReportingProductKind, ReportingProducts, ReportingStep,
+	ReportingStepArgs, ReportingStepId,
+};
+
+fn load_plugin(plugin_dir: &str, plugin_name: &str) -> (Lua, Plugin) {
+	let lua = Lua::new();
+
+	// Init Lua environment
+	let package = lua.globals().get::<Table>("package").unwrap();
+	package
+		.set("path", format!("{}/?.luau", plugin_dir))
+		.unwrap();
+
+	// Require and call the plugin
+	let require = lua.load("require").eval::<Function>().unwrap();
+	let plugin_table = require.call::<Table>(plugin_name).expect("Lua error");
+
+	// Convert plugin to Rust struct
+	let plugin = Plugin {
+		spec: lua
+			.from_value(
+				plugin_table
+					.get("spec")
+					.expect("Error parsing Plugin definition"),
+			)
+			.unwrap(),
+		requires: plugin_table
+			.get("requires")
+			.expect("Error parsing Plugin definition"),
+		execute: plugin_table
+			.get("execute")
+			.expect("Error parsing Plugin definition"),
+	};
+
+	(lua, plugin)
+}
+
+/// Call [ReportingContext::register_lookup_fn] for all steps provided by this module
+pub fn register_lookup_fns(context: &mut ReportingContext) {
+	for plugin_path in context.plugin_names.clone().iter() {
+		let (_, plugin) = load_plugin(&context.plugin_dir, plugin_path);
+
+		for reporting_step in plugin.spec.reporting_steps.iter() {
+			context.register_lookup_fn(
+				reporting_step.name.clone(),
+				reporting_step.product_kinds.clone(),
+				PluginReportingStep::takes_args,
+				PluginReportingStep::from_args,
+			);
+		}
+
+		context
+			.plugin_specs
+			.insert(plugin_path.clone(), plugin.spec);
+	}
+}
+
+#[derive(Debug)]
+pub struct Plugin {
+	spec: PluginSpec,
+	requires: Function,
+	execute: Function,
+}
+
+/// Represents a libdrcr plugin
+#[derive(Debug, Deserialize, Serialize)]
+pub struct PluginSpec {
+	name: String,
+	reporting_steps: Vec<ReportingStepSpec>,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct ReportingStepSpec {
+	name: String,
+	product_kinds: Vec<ReportingProductKind>,
+}
+
+/// Generic reporting step which is implemented by a plugin
+#[derive(Debug)]
+pub struct PluginReportingStep {
+	pub plugin_path: String,
+	pub step_name: String,
+	pub product_kinds: Vec<ReportingProductKind>,
+	pub args: ReportingStepArgs, // Currently only VoidArgs is supported
+}
+
+impl PluginReportingStep {
+	fn takes_args(_name: &str, args: &ReportingStepArgs, _context: &ReportingContext) -> bool {
+		*args == ReportingStepArgs::VoidArgs
+	}
+
+	fn from_args(
+		name: &str,
+		args: ReportingStepArgs,
+		context: &ReportingContext,
+	) -> Box<dyn ReportingStep> {
+		// Look up plugin
+		for (plugin_path, plugin_spec) in context.plugin_specs.iter() {
+			if let Some(reporting_step_spec) =
+				plugin_spec.reporting_steps.iter().find(|s| s.name == name)
+			{
+				return Box::new(Self {
+					plugin_path: plugin_path.to_string(),
+					step_name: name.to_string(),
+					product_kinds: reporting_step_spec.product_kinds.clone(),
+					args,
+				});
+			}
+		}
+
+		panic!("No plugin provides step {}", name);
+	}
+}
+
+impl Display for PluginReportingStep {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		f.write_fmt(format_args!("{} {{PluginReportingStep}}", self.id()))
+	}
+}
+
+#[async_trait]
+impl ReportingStep for PluginReportingStep {
+	fn id(&self) -> ReportingStepId {
+		ReportingStepId {
+			name: self.step_name.clone(),
+			product_kinds: self.product_kinds.clone(),
+			args: self.args.clone(),
+		}
+	}
+
+	fn requires(&self, context: &ReportingContext) -> Vec<ReportingProductId> {
+		// Call to plugin
+		let (lua, plugin) = load_plugin(&context.plugin_dir, &self.plugin_path);
+		let result_table = plugin
+			.requires
+			.call::<Table>((
+				lua.to_value(&self.step_name).unwrap(),
+				lua.to_value(&self.product_kinds).unwrap(),
+				lua.to_value(&self.args).unwrap(),
+			))
+			.expect("Lua error");
+
+		// Convert result to Rust
+		let result = result_table
+			.sequence_values()
+			.map(|s| s.expect("Lua error"))
+			.map(|v| lua.from_value(v).expect("Deserialise error"))
+			.collect::<Vec<ReportingProductId>>();
+
+		result
+	}
+
+	async fn execute(
+		&self,
+		context: &ReportingContext,
+		_steps: &Vec<Box<dyn ReportingStep>>,
+		_dependencies: &ReportingGraphDependencies,
+		_products: &RwLock<ReportingProducts>,
+	) -> Result<ReportingProducts, ReportingExecutionError> {
+		// Call to plugin
+		let (lua, plugin) = load_plugin(&context.plugin_dir, &self.plugin_path);
+		let _result_table = plugin
+			.execute
+			.call::<Table>((
+				lua.to_value(&self.step_name).unwrap(),
+				lua.to_value(&self.product_kinds).unwrap(),
+				lua.to_value(&self.args).unwrap(),
+			))
+			.expect("Lua error");
+
+		eprintln!("Stub: Lua plugin execute");
+
+		Ok(ReportingProducts::new())
+	}
+}
+
+/// Format the [Table] as a string
+fn _dbg_table(table: Table) -> String {
+	format!(
+		"{{{}}}",
+		table
+			.pairs::<Value, Value>()
+			.map(|p| p.expect("Lua error"))
+			.map(|(k, v)| format!("{:?}: {:?}", k, v))
+			.collect::<Vec<_>>()
+			.join(", ")
+	)
+}

libdrcr/src/reporting/types.rs

@@ -30,6 +30,7 @@ use tokio::sync::RwLock;
 
 use crate::db::DbConnection;
 use crate::model::transaction::TransactionWithPostings;
+use crate::plugin::PluginSpec;
 use crate::QuantityInt;
 
 use super::calculator::ReportingGraphDependencies;
@@ -42,6 +43,8 @@ use super::executor::ReportingExecutionError;
 pub struct ReportingContext {
 	// Configuration
 	pub db_connection: DbConnection,
+	pub plugin_dir: String,
+	pub plugin_names: Vec<String>,
 	pub eofy_date: NaiveDate,
 	pub reporting_commodity: String,
 
@@ -51,21 +54,27 @@ pub struct ReportingContext {
 		(ReportingStepTakesArgsFn, ReportingStepFromArgsFn),
 	>,
 	pub(crate) step_dynamic_builders: Vec<ReportingStepDynamicBuilder>,
+	pub(crate) plugin_specs: HashMap<String, PluginSpec>,
 }
 
 impl ReportingContext {
 	/// Initialise a new [ReportingContext]
 	pub fn new(
 		db_connection: DbConnection,
+		plugin_dir: String,
+		plugin_names: Vec<String>,
 		eofy_date: NaiveDate,
 		reporting_commodity: String,
 	) -> Self {
 		Self {
 			db_connection,
+			plugin_dir,
+			plugin_names,
 			eofy_date,
 			reporting_commodity,
 			step_lookup_fn: HashMap::new(),
 			step_dynamic_builders: Vec::new(),
+			plugin_specs: HashMap::new(),
 		}
 	}
 
@@ -139,7 +148,7 @@ pub struct ReportingStepDynamicBuilder {
 // REPORTING PRODUCTS
 
 /// Identifies a [ReportingProduct]
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub struct ReportingProductId {
 	pub name: String,
 	pub kind: ReportingProductKind,
@@ -155,7 +164,7 @@ impl Display for ReportingProductId {
 /// Identifies a type of [Box]ed [ReportingProduct]
 ///
 /// See [Box::downcast].
-#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub enum ReportingProductKind {
 	/// The [Box]ed [ReportingProduct] is a [Transactions]
 	Transactions,
@@ -345,7 +354,7 @@ downcast_rs::impl_downcast!(ReportingStep);
 // REPORTING STEP ARGUMENTS
 
 /// Represents arguments to a [ReportingStep]
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub enum ReportingStepArgs {
 	// This is an enum not a trait, to simply conversion to and from Lua
 	/// [ReportingStepArgs] implementation which takes no arguments
@@ -378,8 +387,9 @@ impl Display for ReportingStepArgs {
 	}
 }
 
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub struct DateArgs {
+	#[serde(with = "crate::serde::naivedate_to_js")]
 	pub date: NaiveDate,
 }
 
@@ -399,9 +409,11 @@ impl Into<DateArgs> for ReportingStepArgs {
 	}
 }
 
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub struct DateStartDateEndArgs {
+	#[serde(with = "crate::serde::naivedate_to_js")]
 	pub date_start: NaiveDate,
+	#[serde(with = "crate::serde::naivedate_to_js")]
 	pub date_end: NaiveDate,
 }
 
@@ -421,7 +433,7 @@ impl Into<DateStartDateEndArgs> for ReportingStepArgs {
 	}
 }
 
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub struct MultipleDateArgs {
 	pub dates: Vec<DateArgs>,
 }
@@ -449,7 +461,7 @@ impl Into<MultipleDateArgs> for ReportingStepArgs {
 	}
 }
 
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
 pub struct MultipleDateStartDateEndArgs {
 	pub dates: Vec<DateStartDateEndArgs>,
 }

libdrcr/src/serde.rs

@@ -16,6 +16,51 @@
 	along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
+/// Serialises [chrono::NaiveDate] in database format
+///
+/// Use as `#[serde(with = "crate::serde::naivedate_to_js")]`, etc.
+pub mod naivedate_to_js {
+	use std::fmt;
+
+	use chrono::NaiveDate;
+	use serde::{
+		de::{self, Unexpected, Visitor},
+		Deserializer, Serializer,
+	};
+
+	pub(crate) fn serialize<S: Serializer>(
+		dt: &NaiveDate,
+		serializer: S,
+	) -> Result<S::Ok, S::Error> {
+		serializer.serialize_str(&dt.format("%Y-%m-%d").to_string())
+	}
+
+	struct DateVisitor;
+	impl<'de> Visitor<'de> for DateVisitor {
+		type Value = NaiveDate;
+
+		fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+			write!(formatter, "a date string")
+		}
+
+		fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
+		where
+			E: de::Error,
+		{
+			match NaiveDate::parse_from_str(s, "%Y-%m-%d") {
+				Ok(dt) => Ok(dt),
+				Err(_) => Err(de::Error::invalid_value(Unexpected::Str(s), &self)),
+			}
+		}
+	}
+
+	pub(crate) fn deserialize<'de, D: Deserializer<'de>>(
+		deserializer: D,
+	) -> Result<NaiveDate, D::Error> {
+		deserializer.deserialize_str(DateVisitor)
+	}
+}
+
 /// Serialises [chrono::NaiveDateTime] in database format
 ///
 /// Use as `#[serde(with = "crate::serde::naivedatetime_to_js")]`, etc.
@@ -40,7 +85,7 @@ pub mod naivedatetime_to_js {
 		type Value = NaiveDateTime;
 
 		fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-			write!(formatter, "a date string")
+			write!(formatter, "a datetime string")
 		}
 
 		fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>

src-tauri/Cargo.lock

@@ -370,6 +370,16 @@ dependencies = [
  "alloc-stdlib",
 ]
 
+[[package]]
+name = "bstr"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "234113d19d0d7d613b40e86fb654acf958910802bcceab913a4f9e7cda03b1a4"
+dependencies = [
+ "memchr",
+ "serde",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.16.0"
@@ -878,7 +888,7 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "330c60081dcc4c72131f8eb70510f1ac07223e5d4163db481a04a0befcffa412"
 dependencies = [
- "libloading",
+ "libloading 0.8.8",
 ]
 
 [[package]]
@@ -977,18 +987,6 @@ version = "1.0.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c7a8fb8a9fbf66c1f703fe16184d10ca0ee9d23be5b4436400408ba54a95005"
 
-[[package]]
-name = "dyn-eq"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c2d035d21af5cde1a6f5c7b444a5bf963520a9f142e5d06931178433d7d5388"
-
-[[package]]
-name = "dyn-hash"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "15401da73a9ed8c80e3b2d4dc05fe10e7b72d7243b9f614e516a44fa99986e88"
-
 [[package]]
 name = "either"
 version = "1.13.0"
@@ -2165,7 +2163,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6e9ec52138abedcc58dc17a7c6c0c00a2bdb4f3427c7f63fa97fd0d859155caf"
 dependencies = [
  "gtk-sys",
- "libloading",
+ "libloading 0.7.4",
  "once_cell",
 ]
 
@@ -2183,9 +2181,8 @@ dependencies = [
  "chrono",
  "downcast-rs 2.0.1",
  "dyn-clone",
- "dyn-eq",
- "dyn-hash",
  "indexmap 2.9.0",
+ "mlua",
  "serde",
  "serde_json",
  "sqlx",
@@ -2202,6 +2199,16 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "libloading"
+version = "0.8.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07033963ba89ebaf1584d767badaa2e8fcec21aedea6b8c0346d487d49c28667"
+dependencies = [
+ "cfg-if",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "libm"
 version = "0.2.11"
@@ -2257,6 +2264,15 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
+[[package]]
+name = "luau0-src"
+version = "0.12.3+luau663"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76ae337c644bbf86a8d8e9ce3ee023311833d41741baf5e51acc31b37843aba1"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "mac"
 version = "0.1.1"
@@ -2351,6 +2367,37 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "mlua"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1f5f8fbebc7db5f671671134b9321c4b9aa9adeafccfd9a8c020ae45c6a35d0"
+dependencies = [
+ "bstr",
+ "either",
+ "erased-serde",
+ "libloading 0.8.8",
+ "mlua-sys",
+ "num-traits",
+ "parking_lot",
+ "rustc-hash",
+ "rustversion",
+ "serde",
+ "serde-value",
+]
+
+[[package]]
+name = "mlua-sys"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380c1f7e2099cafcf40e51d3a9f20a346977587aa4d012eae1f043149a728a93"
+dependencies = [
+ "cc",
+ "cfg-if",
+ "luau0-src",
+ "pkg-config",
+]
+
 [[package]]
 name = "muda"
 version = "0.15.3"
@@ -2769,6 +2816,15 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
+[[package]]
+name = "ordered-float"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f19d67e5a2795c94e73e0bb1cc1a7edeb2e28efd39e2e1c9b7a40c1108b11c"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "ordered-stream"
 version = "0.2.0"
@@ -3424,6 +3480,12 @@ version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
+[[package]]
+name = "rustc-hash"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"
@@ -3446,6 +3508,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a0d197bd2c9dc6e53b84da9556a69ba4cdfab8619eb41a8bd1cc2027a0f6b1d"
+
 [[package]]
 name = "ryu"
 version = "1.0.18"
@@ -3549,6 +3617,16 @@ dependencies = [
  "typeid",
 ]
 
+[[package]]
+name = "serde-value"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a1a3341211875ef120e117ea7fd5228530ae7e7036a779fdc9117be6b3282c"
+dependencies = [
+ "ordered-float",
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.219"

src-tauri/src/libdrcr_austax.rs

@@ -18,15 +18,19 @@
 
 use libdrcr::reporting::dynamic_report::DynamicReport;
 use libdrcr::reporting::types::{ReportingProductId, ReportingProductKind, ReportingStepArgs};
-use tauri::State;
+use tauri::{AppHandle, State};
 use tokio::sync::Mutex;
 
 use crate::libdrcr_bridge::get_report;
 use crate::AppState;
 
 #[tauri::command]
-pub(crate) async fn get_tax_summary(state: State<'_, Mutex<AppState>>) -> Result<String, ()> {
+pub(crate) async fn get_tax_summary(
+	app: AppHandle,
+	state: State<'_, Mutex<AppState>>,
+) -> Result<String, ()> {
 	Ok(get_report(
+		app,
 		state,
 		&ReportingProductId {
 			name: "CalculateIncomeTax".to_string(),

src-tauri/src/libdrcr_bridge.rs

@@ -30,18 +30,25 @@ use libdrcr::reporting::types::{
 	ReportingStepArgs, Transactions,
 };
 use serde::{Deserialize, Serialize};
-use tauri::State;
+use tauri::path::BaseDirectory;
+use tauri::{AppHandle, Manager, State};
 use tokio::sync::Mutex;
 
 use crate::AppState;
 
 fn prepare_reporting_context(context: &mut ReportingContext) {
-	libdrcr::austax::register_lookup_fns(context);
 	libdrcr::reporting::steps::register_lookup_fns(context);
 	libdrcr::reporting::builders::register_dynamic_builders(context);
+	libdrcr::plugin::register_lookup_fns(context);
+}
+
+fn get_plugins() -> Vec<String> {
+	// FIXME: Dynamically get this
+	vec!["austax.austax".to_string()]
 }
 
 pub(crate) async fn get_report(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 	target: &ReportingProductId,
 ) -> Box<dyn ReportingProduct> {
@@ -54,7 +61,18 @@ pub(crate) async fn get_report(
 
 	// Initialise ReportingContext
 	let eofy_date = db_connection.metadata().eofy_date;
-	let mut context = ReportingContext::new(db_connection, eofy_date, "$".to_string());
+	let mut context = ReportingContext::new(
+		db_connection,
+		app.path()
+			.resolve("plugins", BaseDirectory::Resource)
+			.unwrap()
+			.to_str()
+			.unwrap()
+			.to_string(),
+		get_plugins(),
+		eofy_date,
+		"$".to_string(),
+	);
 	prepare_reporting_context(&mut context);
 
 	// Get dynamic report
@@ -75,9 +93,11 @@ pub(crate) async fn get_report(
 
 #[tauri::command]
 pub(crate) async fn get_all_transactions_except_earnings_to_equity(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 ) -> Result<String, ()> {
 	let transactions = get_report(
+		app,
 		state,
 		&ReportingProductId {
 			name: "AllTransactionsExceptEarningsToEquity".to_string(),
@@ -97,10 +117,12 @@ pub(crate) async fn get_all_transactions_except_earnings_to_equity(
 
 #[tauri::command]
 pub(crate) async fn get_all_transactions_except_earnings_to_equity_for_account(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 	account: String,
 ) -> Result<String, ()> {
 	let transactions = get_report(
+		app,
 		state,
 		&ReportingProductId {
 			name: "AllTransactionsExceptEarningsToEquity".to_string(),
@@ -126,6 +148,7 @@ pub(crate) async fn get_all_transactions_except_earnings_to_equity_for_account(
 
 #[tauri::command]
 pub(crate) async fn get_balance_sheet(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 	dates: Vec<String>,
 ) -> Result<String, ()> {
@@ -137,6 +160,7 @@ pub(crate) async fn get_balance_sheet(
 	}
 
 	Ok(get_report(
+		app,
 		state,
 		&ReportingProductId {
 			name: "BalanceSheet".to_string(),
@@ -154,6 +178,7 @@ pub(crate) async fn get_balance_sheet(
 
 #[tauri::command]
 pub(crate) async fn get_income_statement(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 	dates: Vec<(String, String)>,
 ) -> Result<String, ()> {
@@ -166,6 +191,7 @@ pub(crate) async fn get_income_statement(
 	}
 
 	Ok(get_report(
+		app,
 		state,
 		&ReportingProductId {
 			name: "IncomeStatement".to_string(),
@@ -183,12 +209,14 @@ pub(crate) async fn get_income_statement(
 
 #[tauri::command]
 pub(crate) async fn get_trial_balance(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 	date: String,
 ) -> Result<String, ()> {
 	let date = NaiveDate::parse_from_str(&date, "%Y-%m-%d").expect("Invalid date");
 
 	Ok(get_report(
+		app,
 		state,
 		&ReportingProductId {
 			name: "TrialBalance".to_string(),
@@ -211,6 +239,7 @@ struct ValidatedBalanceAssertion {
 
 #[tauri::command]
 pub(crate) async fn get_validated_balance_assertions(
+	app: AppHandle,
 	state: State<'_, Mutex<AppState>>,
 ) -> Result<String, ()> {
 	let state = state.lock().await;
@@ -233,8 +262,18 @@ pub(crate) async fn get_validated_balance_assertions(
 
 	// Initialise ReportingContext
 	let eofy_date = db_connection.metadata().eofy_date;
-	let mut context =
+	let mut context = ReportingContext::new(
-		ReportingContext::new(db_connection, get_plugins(), eofy_date, "$".to_string());
+		db_connection,
+		app.path()
+			.resolve("plugins", BaseDirectory::Resource)
+			.unwrap()
+			.to_str()
+			.unwrap()
+			.to_string(),
+		get_plugins(),
+		eofy_date,
+		"$".to_string(),
+	);
 	prepare_reporting_context(&mut context);
 
 	// Get report targets

src-tauri/tauri.conf.json

@@ -26,6 +26,9 @@
     "targets": "all",
     "icon": [
       "icons/icon.png"
-    ]
+    ],
+    "resources": {
+      "../libdrcr/plugins/": "plugins/"
+    }
   }
 }