Use sol_path

src/app_state.rs

@@ -321,14 +321,10 @@ impl AppState {
                 .write_solution_to_disk(self.current_exercise_ind, current_exercise.name)
                 .map(Some)
         } else {
-            let solution_path = if let Some(dir) = current_exercise.dir {
-                format!("solutions/{dir}/{}.rs", current_exercise.name)
-            } else {
-                format!("solutions/{}.rs", current_exercise.name)
-            };
+            let sol_path = current_exercise.sol_path();
 
-            if Path::new(&solution_path).exists() {
-                return Ok(Some(solution_path));
+            if Path::new(&sol_path).exists() {
+                return Ok(Some(sol_path));
             }
 
             Ok(None)

src/cargo_toml.rs

@@ -1,7 +1,7 @@
 use anyhow::{Context, Result};
 use std::path::Path;
 
-use crate::info_file::ExerciseInfo;
+use crate::{exercise::RunnableExercise, info_file::ExerciseInfo};
 
 /// Initial capacity of the bins buffer.
 pub const BINS_BUFFER_CAPACITY: usize = 1 << 14;

src/exercise.rs

@@ -68,6 +68,7 @@ pub struct Exercise {
 
 pub trait RunnableExercise {
     fn name(&self) -> &str;
+    fn dir(&self) -> Option<&str>;
     fn strict_clippy(&self) -> bool;
     fn test(&self) -> bool;
 
@@ -145,6 +146,31 @@ pub trait RunnableExercise {
 
         self.run::<true>(&bin_name, output, cmd_runner)
     }
+
+    fn sol_path(&self) -> String {
+        let name = self.name();
+
+        let mut path = if let Some(dir) = self.dir() {
+            // 14 = 10 + 1 + 3
+            // solutions/ + / + .rs
+            let mut path = String::with_capacity(14 + dir.len() + name.len());
+            path.push_str("solutions/");
+            path.push_str(dir);
+            path.push('/');
+            path
+        } else {
+            // 13 = 10 + 3
+            // solutions/ + .rs
+            let mut path = String::with_capacity(13 + name.len());
+            path.push_str("solutions/");
+            path
+        };
+
+        path.push_str(name);
+        path.push_str(".rs");
+
+        path
+    }
 }
 
 impl RunnableExercise for Exercise {
@@ -153,6 +179,11 @@ impl RunnableExercise for Exercise {
         self.name
     }
 
+    #[inline]
+    fn dir(&self) -> Option<&str> {
+        self.dir
+    }
+
     #[inline]
     fn strict_clippy(&self) -> bool {
         self.strict_clippy

src/info_file.rs

@@ -52,30 +52,6 @@ impl ExerciseInfo {
 
         path
     }
-
-    /// Path to the solution file starting with the `solutions/` directory.
-    pub fn sol_path(&self) -> String {
-        let mut path = if let Some(dir) = &self.dir {
-            // 14 = 10 + 1 + 3
-            // solutions/ + / + .rs
-            let mut path = String::with_capacity(14 + dir.len() + self.name.len());
-            path.push_str("solutions/");
-            path.push_str(dir);
-            path.push('/');
-            path
-        } else {
-            // 13 = 10 + 3
-            // solutions/ + .rs
-            let mut path = String::with_capacity(13 + self.name.len());
-            path.push_str("solutions/");
-            path
-        };
-
-        path.push_str(&self.name);
-        path.push_str(".rs");
-
-        path
-    }
 }
 
 impl RunnableExercise for ExerciseInfo {
@@ -84,6 +60,11 @@ impl RunnableExercise for ExerciseInfo {
         &self.name
     }
 
+    #[inline]
+    fn dir(&self) -> Option<&str> {
+        self.dir.as_deref()
+    }
+
     #[inline]
     fn strict_clippy(&self) -> bool {
         self.strict_clippy

src/init.rs

@@ -13,8 +13,8 @@ use std::{
 };
 
 use crate::{
-    cargo_toml::updated_cargo_toml, embedded::EMBEDDED_FILES, info_file::InfoFile,
-    term::press_enter_prompt,
+    cargo_toml::updated_cargo_toml, embedded::EMBEDDED_FILES, exercise::RunnableExercise,
+    info_file::InfoFile, term::press_enter_prompt,
 };
 
 #[derive(Deserialize)]