Convert flows to target currency (#11)

* Convert flows to target currency

* show error message if currency conversion fails

* fix tests

Makefile

@@ -21,13 +21,18 @@ test-js-update:
 run:
 	cd example; pipenv run fava example.beancount
 
+run-debug:
+	cd example; pipenv run fava --debug example.beancount
+
 format:
 	cd frontend; npx prettier -w . ../src/fava_portfolio_returns/templates/*.css
 	cd example; pipenv run black ../src/fava_portfolio_returns/__init__.py
 	cd example; find . -name '*.beancount' -exec pipenv run bean-format -c 59 -o "{}" "{}" \;
 
 ci:
+	make build-js
 	make run &
 	make test-js
+
 	make format
 	git diff --exit-code

example/beangrow.pbtxt

@@ -79,6 +79,11 @@ groups {
     name: "CORP"
     investment: "Assets:US:ETrade:CORP"
   }
+  group {
+    name: "CORP (converted to EUR)"
+    investment: "Assets:US:ETrade:CORP"
+    currency: "EUR"
+  }
   group {
     name: "CORPEUR"
     investment: "Assets:US:ETrade:CORPEUR"
@@ -87,5 +92,10 @@ groups {
     name: "CORPSPL"
     investment: "Assets:US:ETrade:CORPSPL"
   }
+  group {
+    name: "CORP (all)"
+    investment: "Assets:US:ETrade:CORP"
+    investment: "Assets:US:ETrade:CORPEUR"
+    currency: "USD"
+  }
 }
-

example/example.beancount

@@ -5138,6 +5138,8 @@ plugin "beancount.plugins.implicit_prices"
 2022-02-18 price VHT                               240.66 USD
 2022-02-18 price GLD                               144.57 USD
 
+2023-01-01 price EUR                                 2.00 USD
+
 
 * Test Stock CORP
 
@@ -5215,6 +5217,7 @@ plugin "beancount.plugins.implicit_prices"
 ;  Income:US:ETrade:PnL ; 190 USD
 
 2023-08-01 price CORP                                   3 USD
+2023-08-01 price CORP                                1.50 EUR
 
 ; 2023-08-01
 ; 0 CORP

frontend/src/utils.ts

@@ -1,9 +1,7 @@
-export function getCurrencyFormatter(currency: string) {
-    const currencyFormat = new Intl.NumberFormat(undefined, {
-        style: "currency",
-        currency,
-    });
-    return (value: any) => {
-        return currencyFormat.format(value);
-    };
+export function getCurrencyFormatter(currency: string): (value: any) => string {
+    try {
+        return new Intl.NumberFormat(undefined, { style: "currency", currency }).format;
+    } catch {
+        return new Intl.NumberFormat().format;
+    }
 }