card: split up into its own module.

src/card/display.rs

@@ -0,0 +1,56 @@
+use crate::card::{Card, PlayingCard, Rank, Suit};
+use std::fmt::{Display, Formatter};
+
+impl Display for Rank {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Rank::Jack => "J",
+                Rank::Queen => "Q",
+                Rank::King => "K",
+                Rank::Ace => "A",
+                Rank::Two => "2",
+                Rank::Three => "3",
+                Rank::Four => "4",
+                Rank::Five => "5",
+                Rank::Six => "6",
+                Rank::Seven => "7",
+                Rank::Eight => "8",
+                Rank::Nine => "9",
+                Rank::Ten => "10",
+            }
+        )
+    }
+}
+
+impl Display for Suit {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                Suit::Diamond => "♦",
+                Suit::Club => "♣",
+                Suit::Heart => "♥",
+                Suit::Spade => "♠",
+            }
+        )
+    }
+}
+
+impl Display for PlayingCard {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}[{}]", self.rank, self.suit)
+    }
+}
+
+impl Display for Card {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Card::Joker(_) => write!(f, "Joker"),
+            Card::PlayingCard(card) => write!(f, "{}", card),
+        }
+    }
+}