Remove Backplane::{cards,cards_mut}

src/backplane.rs

@@ -1,4 +1,7 @@
+use std::fmt::Display;
+
 use anyhow::anyhow;
+use itertools::Itertools;
 use nullable_result::{GeneralIterExt, NullableResult};
 
 use crate::{
@@ -11,6 +14,20 @@ pub struct Backplane {
     cards: Vec<Box<dyn Card>>,
 }
 
+impl Display for Backplane {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_fmt(format_args!(
+            "{}",
+            self.cards
+                .iter()
+                .enumerate()
+                .format_with("\n", |(i, card), g| {
+                    g(&format_args!("Card {i}: {card}"))
+                })
+        ))
+    }
+}
+
 impl Backplane {
     pub fn new(cards: Vec<card::Config<'_>>) -> anyhow::Result<Self> {
         if cards.len() > 255 {
@@ -24,13 +41,17 @@ impl Backplane {
         })
     }
 
-    #[allow(dead_code)]
-    pub fn cards(&self) -> &[Box<dyn Card>] {
-        self.cards.as_ref()
+    pub fn reset(&mut self) {
+        for card in &mut self.cards {
+            card.reset();
+        }
     }
 
-    pub fn cards_mut(&mut self) -> &mut Vec<Box<dyn Card>> {
-        &mut self.cards
+    pub fn card_cmd(&mut self, card_num: u8, cmd: &[&str]) -> anyhow::Result<()> {
+        self.cards
+            .get_mut(card_num as usize)
+            .ok_or_else(|| anyhow!("Card {} does not exist", card_num))?
+            .cmd(cmd)
     }
 
     pub fn read_word(&mut self, address: u32) -> Result<u16, BusError> {

src/main.rs

@@ -85,36 +85,20 @@ fn main() -> Result<(), anyhow::Error> {
             .about("Send a command to a card"),
         |args, state| {
             let num = args.get_one::<String>("num").unwrap().parse::<u8>()?;
-            state
-                .cpu
-                .bus_mut()
-                .cards_mut()
-                .get_mut(num as usize)
-                .ok_or_else(|| anyhow!("Card {} does not exist", num))?
-                .cmd(
-                    &args
-                        .get_many::<String>("cmd")
-                        .unwrap()
-                        .map(String::as_str)
-                        .collect_vec(),
-                )?;
+            state.cpu.bus_mut().card_cmd(
+                num,
+                &args
+                    .get_many::<String>("cmd")
+                    .unwrap()
+                    .map(String::as_str)
+                    .collect_vec(),
+            )?;
             Ok(None)
         },
     )
     .with_command(
         Command::new("ls").about("List the cards in the system"),
-        |_, state| {
-            Ok(Some(
-                state
-                    .cpu
-                    .bus_mut()
-                    .cards()
-                    .iter()
-                    .enumerate()
-                    .map(|(i, card)| format!("Card {i}: {card}"))
-                    .join("\n"),
-            ))
-        },
+        |_, state| Ok(Some(state.cpu.bus_mut().to_string())),
     )
     .with_command(
         Command::new("regs").about("Show CPU registers"),
@@ -209,9 +193,7 @@ fn main() -> Result<(), anyhow::Error> {
     .with_command(
         Command::new("reset").about("Reset the cards and CPU, in that order"),
         |_, state| {
-            for card in state.cpu.bus_mut().cards_mut() {
-                card.reset();
-            }
+            state.cpu.bus_mut().reset();
             state.cpu.reset();
             Ok(None)
         },