Add order by option

src/cli.rs

@@ -29,11 +29,21 @@ pub struct Cli {
     #[arg(long = "force-color")]
     pub force_color: bool,
 
+    /// Sort by the currency name (in alphabetical order), or by the rate value (low -> high)
+    #[arg(value_enum, long = "sort-by", short = 's', default_value_t = SortBy::Currency)]
+    pub sort_by: SortBy,
+
     /// Amount of data
     #[arg(value_enum, default_value_t = Resolution::TODAY, long="resolution", short='r')]
     pub resolution: Resolution,
 }
 
+#[derive(Debug, Clone, Copy, ValueEnum)]
+pub enum SortBy {
+    Currency,
+    Rate,
+}
+
 #[derive(Debug, Clone, Copy, ValueEnum)]
 pub enum Resolution {
     TODAY,
@@ -51,6 +61,15 @@ impl Resolution {
     }
 }
 
+impl SortBy {
+    pub fn get_comparer(&self) -> fn(&(&str, f64), &(&str, f64)) -> std::cmp::Ordering {
+        match self {
+            Self::Currency => |a, b| a.0.cmp(&b.0),
+            Self::Rate => |a, b| a.1.total_cmp(&b.1),
+        }
+    }
+}
+
 #[derive(Debug, Clone, Copy, ValueEnum)]
 pub enum FormatOption {
     /// JSON output

src/main.rs

@@ -114,7 +114,7 @@ async fn main() -> ExitCode {
             .iter()
             .map(|x| {
                 let mut t: TableRef = x.into();
-                t.sort();
+                t.sort(&cli.sort_by);
                 t.to_string()
             })
             .collect::<Vec<_>>()

src/table/table_owned.rs

@@ -1,5 +1,6 @@
 use std::fmt::Display;
 
+use crate::cli::SortBy;
 use crate::models::ExchangeRateResult;
 
 use super::table_display::helper_table_print;
@@ -47,8 +48,10 @@ impl<'a> TableTrait<'a> for Table {
         self.rows.push((row_left, row_right));
     }
 
-    fn sort(&mut self) {
+    fn sort(&mut self, sort_by: &SortBy) {
-        self.rows.sort_by(|a, b| a.1.total_cmp(&b.1));
+        let comparer = sort_by.get_comparer();
+        self.rows
+            .sort_by(|a, b| comparer(&(&a.0, a.1), &(&b.0, b.1)));
     }
 }
 

src/table/table_ref.rs

@@ -1,5 +1,6 @@
 use std::fmt::Display;
 
+use crate::cli::SortBy;
 use crate::models::ExchangeRateResult;
 
 use super::table_display::helper_table_print;
@@ -49,8 +50,9 @@ impl<'a> TableTrait<'a> for TableRef<'a> {
         self.rows.push((row_left, row_right));
     }
 
-    fn sort(&mut self) {
+    fn sort(&mut self, sort_by: &SortBy) {
-        self.rows.sort_by(|a, b| a.1.total_cmp(&b.1));
+        let comparer = sort_by.get_comparer();
+        self.rows.sort_by(comparer);
     }
 }
 

src/table/table_trait.rs

@@ -1,12 +1,18 @@
+use crate::cli::SortBy;
+
 pub trait TableTrait<'a> {
     type Header;
     type ColumnLeft;
     type ColumnRight;
     type RowLeft;
 
-    fn new(header: Option<Self::Header>, column_left: Self::ColumnLeft, column_right: Self::ColumnRight) -> Self;
+    fn new(
+        header: Option<Self::Header>,
+        column_left: Self::ColumnLeft,
+        column_right: Self::ColumnRight,
+    ) -> Self;
     fn disable_header(&mut self);
     fn set_header(&mut self, header: Self::Header);
     fn add_row(&mut self, row_left: Self::RowLeft, row_right: f64);
-    fn sort(&mut self);
+    fn sort(&mut self, sort_by: &SortBy);
 }