Allow processing for hints and messages in the info file

src/info_file.rs

@@ -6,11 +6,11 @@ use crate::{embedded::EMBEDDED_FILES, exercise::RunnableExercise};
 
 /// Deserialized from the `info.toml` file.
 #[derive(Deserialize)]
-pub struct ExerciseInfo {
+pub struct ExerciseInfo<'a> {
     /// Exercise's unique name.
-    pub name: &'static str,
+    pub name: &'a str,
     /// Exercise's directory name inside the `exercises/` directory.
-    pub dir: Option<&'static str>,
+    pub dir: Option<&'a str>,
     /// Run `cargo test` on the exercise.
     #[serde(default = "default_true")]
     pub test: bool,
@@ -18,7 +18,7 @@ pub struct ExerciseInfo {
     #[serde(default)]
     pub strict_clippy: bool,
     /// The exercise's hint to be shown to the user on request.
-    pub hint: &'static str,
+    pub hint: String,
     /// The exercise is already solved. Ignore it when checking that all exercises are unsolved.
     #[serde(default)]
     pub skip_check_unsolved: bool,
@@ -27,7 +27,7 @@ const fn default_true() -> bool {
     true
 }
 
-impl ExerciseInfo {
+impl ExerciseInfo<'_> {
     /// Path to the exercise file starting with the `exercises/` directory.
     pub fn path(&self) -> String {
         let mut path = if let Some(dir) = self.dir {
@@ -53,7 +53,7 @@ impl ExerciseInfo {
     }
 }
 
-impl RunnableExercise for ExerciseInfo {
+impl RunnableExercise for ExerciseInfo<'_> {
     fn name(&self) -> &str {
         self.name
     }
@@ -77,11 +77,14 @@ pub struct InfoFile {
     /// For possible breaking changes in the future for community exercises.
     pub format_version: u8,
     /// Shown to users when starting with the exercises.
-    pub welcome_message: Option<&'static str>,
+    #[serde(default)]
+    pub welcome_message: String,
     /// Shown to users after finishing all exercises.
-    pub final_message: Option<&'static str>,
+    #[serde(default)]
+    pub final_message: String,
     /// List of all exercises.
-    pub exercises: Vec<ExerciseInfo>,
+    #[serde(borrow)]
+    pub exercises: Vec<ExerciseInfo<'static>>,
 }
 
 impl InfoFile {
@@ -89,15 +92,10 @@ impl InfoFile {
     /// Community exercises: Parse the `info.toml` file in the current directory.
     pub fn parse() -> Result<Self> {
         // Read a local `info.toml` if it exists.
-        let slf = match fs::read("info.toml") {
+        let slf = match fs::read_to_string("info.toml") {
             Ok(file_content) => {
-                // Remove `\r` on Windows.
-                // Leaking is fine since the info file is used until the end of the program.
-                let file_content =
-                    String::from_utf8(file_content.into_iter().filter(|c| *c != b'\r').collect())
-                        .context("Failed to parse `info.toml` as UTF8")?
-                        .leak();
-                toml::de::from_str::<Self>(file_content)
+                // LEAKING: The info file is used until the end of the program.
+                toml::de::from_str::<Self>(file_content.leak())
                     .context("Failed to parse the `info.toml` file")?
             }
             Err(e) => {