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src/config.rs

@@ -20,10 +20,16 @@ pub struct ConfigManager {
 }
 
 fn read_config<P: AsRef<Path>>(path: P) -> Result<Config, Box<dyn Error>> {
-    let file = File::open(path)?;
-    let reader = BufReader::new(file);
-    let result: Config = from_reader(reader)?;
-    Ok(result)
+    if path.as_ref().exists() {
+        let file = File::open(path)?;
+        let reader = BufReader::new(file);
+        let result: Config = from_reader(reader)?;
+        Ok(result)
+    } else {
+        Ok(Config {
+            save_directory: Some(String::from("tmp")),
+        })
+    }
 }
 
 impl ConfigManager {

src/state.rs

@@ -21,10 +21,14 @@ pub struct StateManager {
 }
 
 fn read_state<P: AsRef<Path>>(path: P) -> Result<State, Box<dyn Error>> {
-    let file = File::open(path)?;
-    let reader = BufReader::new(file);
-    let result: State = from_reader(reader)?;
-    Ok(result)
+    if path.as_ref().exists() {
+        let file = File::open(path)?;
+        let reader = BufReader::new(file);
+        let result: State = from_reader(reader)?;
+        Ok(result)
+    } else {
+        Ok(State { downloaded: vec![] })
+    }
 }
 
 fn save_state<P: AsRef<Path>>(path: P, state: &State) -> serde_json::Result<()> {