Rounding

src/cli.rs

@@ -41,6 +41,10 @@ pub struct Cli {
     #[arg(long = "invert", short = 'i')]
     pub should_invert: bool,
 
+    //// Max decimals to keep in price.
+    #[arg(long = "max-decimals", short = 'd', default_value_t = 5)]
+    pub max_decimals: u8,
+
     /// Amount of data
     #[arg(value_enum, default_value_t = Resolution::TODAY, long="resolution", short='r')]
     pub resolution: Resolution,

src/main.rs

@@ -7,7 +7,7 @@ use ecb_rates::cli::{Cli, FormatOption};
 use ecb_rates::models::ExchangeRateResult;
 use ecb_rates::parsing::parse;
 use ecb_rates::table::{TableRef, TableTrait as _};
-use ecb_rates::utils_calc::{change_perspective, filter_currencies, invert_rates};
+use ecb_rates::utils_calc::{change_perspective, filter_currencies, invert_rates, round};
 
 async fn get_and_parse(url: impl IntoUrl) -> anyhow::Result<Vec<ExchangeRateResult>> {
     let client = Client::new();
@@ -84,6 +84,8 @@ async fn main() -> ExitCode {
         invert_rates(&mut parsed);
     }
 
+    round(&mut parsed, cli.max_decimals);
+
     if !cli.currencies.is_empty() {
         let currencies = cli
             .currencies

src/table/table_display.rs

@@ -36,7 +36,7 @@ pub fn helper_table_print<T: TableGet>(
 
     for (left, right) in table.get_rows().iter() {
         let left_str = left.as_ref();
-        let right_str = format!("{:.5}", right);
+        let right_str = right.to_string();
         let padding_amount = width.saturating_sub(left_str.len() + right_str.len());
         let padding = " ".repeat(padding_amount);
         writeln!(f, "{}{}{}", left_str.bold().green(), padding, right_str)?;

src/utils_calc.rs

@@ -44,3 +44,13 @@ pub fn invert_rates(exchange_rate_results: &mut [ExchangeRateResult]) {
         }
     }
 }
+
+pub fn round(exchange_rate_results: &mut [ExchangeRateResult], max_decimals: u8) {
+    let power = 10.0_f64.powf(max_decimals as f64);
+    for rate_res in exchange_rate_results {
+        for (_, iter_rate) in rate_res.rates.iter_mut() {
+            let more = iter_rate.deref() * power;
+            *iter_rate = more.round() / power;
+        }
+    }
+}