Added Reset All Feature

src/main.rs

@@ -176,9 +176,17 @@ fn main() -> Result<ExitCode> {
             }
         }
         Some(Subcommands::Reset { name }) => {
-            app_state.set_current_exercise_by_name(&name)?;
-            let exercise_path = app_state.reset_current_exercise()?;
-            println!("The exercise {exercise_path} has been reset");
+            if name == "all" {
+                let n_exercises = app_state.exercises().len();
+                for ind in 0..n_exercises {
+                    app_state.reset_exercise_by_ind(ind)?;
+                }
+                println!("All exercises have been reset");
+            } else {
+                app_state.set_current_exercise_by_name(&name)?;
+                let exercise_path = app_state.reset_current_exercise()?;
+                println!("The exercise {exercise_path} has been reset");
+            }
         }
         Some(Subcommands::Hint { name }) => {
             if let Some(name) = name {

tests/integration_tests.rs

@@ -143,6 +143,15 @@ fn reset_without_exercise_name() {
     Cmd::default().args(&["reset"]).fail();
 }
 
+#[test]
+fn reset_all() {
+    Cmd::default()
+        .current_dir("tests/test_exercises")
+        .args(&["reset", "all"])
+        .output(PartialStdout("All exercises have been reset"))
+        .success();
+}
+
 #[test]
 fn hint() {
     Cmd::default()

website/content/usage/index.md

@@ -43,6 +43,13 @@ The list allows you to…
 
 See the footer of the list for all possible keys.
 
+## Resetting Exercises
+
+You can reset an exercise to its original state using the `reset` command:
+
+- `rustlings reset <exercise_name>`: Reset a single exercise
+- `rustlings reset all`: Reset all exercises
+
 ## Questions?
 
 If you need any help while doing the exercises and the builtin hints aren't helpful, feel free to ask in the [_Q&A_ discussions](https://github.com/rust-lang/rustlings/discussions/categories/q-a?discussions_q=) if your question isn't answered there 💡