async1: Read input from files

src/embedded.rs

@@ -19,6 +19,12 @@ struct ExerciseFiles {
     dir_ind: usize,
 }
 
+// Input files that may be read by exercises.
+pub struct InputFile {
+    pub name: &'static str,
+    pub content: &'static str,
+}
+
 fn create_dir_if_not_exists(path: &str) -> Result<()> {
     if let Err(e) = create_dir(path)
         && e.kind() != io::ErrorKind::AlreadyExists
@@ -58,6 +64,7 @@ pub struct EmbeddedFiles {
     pub info_file: &'static str,
     exercise_files: &'static [ExerciseFiles],
     pub exercise_dirs: &'static [ExerciseDir],
+    pub input_files: &'static [InputFile],
 }
 
 impl EmbeddedFiles {

src/init.rs

@@ -144,6 +144,15 @@ pub fn init() -> Result<()> {
             .with_context(|| format!("Failed to create the file {solution_path}"))?;
     }
 
+    // init input files
+    create_dir("input_files").context("Failed to create the directory `input_files`")?;
+    for input_file in EMBEDDED_FILES.input_files {
+        fs::write(
+            format!("input_files/{}", input_file.name),
+            input_file.content,
+        )?;
+    }
+
     let current_cargo_toml = include_str!("../dev-Cargo.toml");
     // Skip the first line (comment).
     let newline_ind = current_cargo_toml