usage

src/main.rs

@@ -14,6 +14,7 @@ fn main() {
         Mat::Ingot,
         Mat::Gem,
     ];
+    usage();
     print_priority(&priority);
     let input = std::io::stdin();
     for line in input.lines() {
@@ -21,15 +22,15 @@ fn main() {
             println!("error reading line");
             continue;
         };
-        let Some((cmd, args)) = line.split_once(" ") else {
-            println!("space expected after command");
-            continue;
+        let (cmd, args) = match line.split_once(" ") {
+            Some(v) => v,
+            None => (line.as_str(), ""),
         };
         match cmd {
             "solve" => run_solve(args, &priority),
             "priority" => run_priority(args, &mut priority),
             _ => {
-                println!("unknown command");
+                println!("unknown command {cmd}");
             }
         }
     }
@@ -116,7 +117,7 @@ fn run_priority(args: &str, priority: &mut Priority) {
 }
 
 fn print_priority(priority: &Priority) {
-    println!("priority:");
+    println!("current priority:");
     for (i, mat) in priority.iter().enumerate() {
         println!("   {}: {mat:?}", i + 1);
     }
@@ -133,7 +134,7 @@ fn validate_priority(priority: &Priority) -> bool {
 }
 
 fn usage() {
-    println!("Usage:");
+    println!("usage:");
     println!("   > solve 41/63 50/60 55/55 43/64 60/66 51/55 48/59 41/63");
     println!("   solves for the least number of materials needed given a priority");
     println!("   > priority wood paper grains string oil meat");