Add Kr currency unit and period display

- Show Kr after all amounts and prices
- Replace batch reference with period (first-last date)
- Same period shown on all customer invoices

src/main.rs

@@ -90,14 +90,14 @@ impl PreparedCustomer {
 #[template(path = "index.html")]
 struct IndexTemplate {
     customers: Vec<(String, usize)>,
-    batches: Vec<String>,
+    period: String,
 }
 
 #[derive(Template)]
 #[template(path = "customer.html")]
 struct CustomerTemplate {
     customer: PreparedCustomer,
-    batches: Vec<String>,
+    period: String,
     generated_date: String,
 }
 
@@ -129,7 +129,14 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         batch.filename
     );
 
-    let batch_filename = batch.filename.clone();
+    let first_date = batch.transactions.first().map(|t| t.date).unwrap();
+    let last_date = batch.transactions.last().map(|t| t.date).unwrap();
+    let period = format!(
+        "{} - {}",
+        first_date.format("%Y-%m-%d"),
+        last_date.format("%Y-%m-%d")
+    );
+
     let customers = group_by_customer(&[batch]);
 
     let index_customers: Vec<(String, usize)> = customers
@@ -139,7 +146,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let html = IndexTemplate {
         customers: index_customers.clone(),
-        batches: vec![batch_filename.clone()],
+        period: period.clone(),
     }
     .render()
     .unwrap();
@@ -152,7 +159,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         let prepared = PreparedCustomer::from_customer(customer);
         let customer_html = CustomerTemplate {
             customer: prepared,
-            batches: vec![batch_filename.clone()],
+            period: period.clone(),
             generated_date: generated_date.clone(),
         }
         .render()