WIP: Deduplicate subcommand logic

examples/multicall_busybox.rs

@@ -34,19 +34,17 @@ fn main() {
         .subcommand(false_applet());
 
     let matches = app.get_matches();
-    match matches.subcommand() {
-        Some(("busybox", cmd)) => {
-            if cmd.occurrences_of("install") > 0 {
-                unimplemented!("Make hardlinks to the executable here");
-            }
-            match cmd.subcommand() {
-                Some(("false", _)) => exit(1),
-                Some(("true", _)) => exit(0),
-                _ => unreachable!(),
-            }
+    let mut subcommand = matches.subcommand();
+    if let Some(("busybox", cmd)) = subcommand {
+        if cmd.occurrences_of("install") > 0 {
+            unimplemented!("Make hardlinks to the executable here");
         }
-        Some(("false", _)) => exit(1),
-        Some(("true", _)) => exit(0),
-        _ => unreachable!(),
+        subcommand = cmd.subcommand();
+    }
+    if let Some(("false", _)) = subcommand {
+        exit(1)
+    }
+    if let Some(("true", _)) = subcommand {
+        exit(0)
     }
 }