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|
use anyhow::{Context, Error, Result};
use std::{
fs::{self, create_dir},
io,
};
use crate::info_file::ExerciseInfo;
/// Contains all embedded files.
pub static EMBEDDED_FILES: EmbeddedFiles = rustlings_macros::include_files!();
// Files related to one exercise.
struct ExerciseFiles {
// The content of the exercise file.
exercise: &'static [u8],
// The content of the solution file.
solution: &'static [u8],
// Index of the related `ExerciseDir` in `EmbeddedFiles::exercise_dirs`.
dir_ind: usize,
}
fn create_dir_if_not_exists(path: &str) -> Result<()> {
if let Err(e) = create_dir(path) {
if e.kind() != io::ErrorKind::AlreadyExists {
return Err(Error::from(e).context(format!("Failed to create the directory {path}")));
}
}
Ok(())
}
// A directory in the `exercises/` directory.
pub struct ExerciseDir {
pub name: &'static str,
readme: &'static [u8],
}
impl ExerciseDir {
fn init_on_disk(&self) -> Result<()> {
// 20 = 10 + 10
// exercises/ + /README.md
let mut dir_path = String::with_capacity(20 + self.name.len());
dir_path.push_str("exercises/");
dir_path.push_str(self.name);
create_dir_if_not_exists(&dir_path)?;
let mut readme_path = dir_path;
readme_path.push_str("/README.md");
fs::write(&readme_path, self.readme)
.with_context(|| format!("Failed to write the file {readme_path}"))
}
}
/// All embedded files.
pub struct EmbeddedFiles {
/// The content of the `info.toml` file.
pub info_file: &'static str,
exercise_files: &'static [ExerciseFiles],
pub exercise_dirs: &'static [ExerciseDir],
}
impl EmbeddedFiles {
/// Dump all the embedded files of the `exercises/` directory.
pub fn init_exercises_dir(&self, exercise_infos: &[ExerciseInfo]) -> Result<()> {
create_dir("exercises").context("Failed to create the directory `exercises`")?;
fs::write(
"exercises/README.md",
include_bytes!("../exercises/README.md"),
)
.context("Failed to write the file exercises/README.md")?;
for dir in self.exercise_dirs {
dir.init_on_disk()?;
}
let mut exercise_path = String::with_capacity(64);
let prefix = "exercises/";
exercise_path.push_str(prefix);
for (exercise_info, exercise_files) in exercise_infos.iter().zip(self.exercise_files) {
let dir = &self.exercise_dirs[exercise_files.dir_ind];
exercise_path.truncate(prefix.len());
exercise_path.push_str(dir.name);
exercise_path.push('/');
exercise_path.push_str(&exercise_info.name);
exercise_path.push_str(".rs");
fs::write(&exercise_path, exercise_files.exercise)
.with_context(|| format!("Failed to write the exercise file {exercise_path}"))?;
}
Ok(())
}
pub fn write_exercise_to_disk(&self, exercise_ind: usize, path: &str) -> Result<()> {
let exercise_files = &self.exercise_files[exercise_ind];
let dir = &self.exercise_dirs[exercise_files.dir_ind];
dir.init_on_disk()?;
fs::write(path, exercise_files.exercise)
.with_context(|| format!("Failed to write the exercise file {path}"))
}
/// Write the solution file to disk and return its path.
pub fn write_solution_to_disk(
&self,
exercise_ind: usize,
exercise_name: &str,
) -> Result<String> {
create_dir_if_not_exists("solutions")?;
let exercise_files = &self.exercise_files[exercise_ind];
let dir = &self.exercise_dirs[exercise_files.dir_ind];
// 14 = 10 + 1 + 3
// solutions/ + / + .rs
let mut dir_path = String::with_capacity(14 + dir.name.len() + exercise_name.len());
dir_path.push_str("solutions/");
dir_path.push_str(dir.name);
create_dir_if_not_exists(&dir_path)?;
let mut solution_path = dir_path;
solution_path.push('/');
solution_path.push_str(exercise_name);
solution_path.push_str(".rs");
fs::write(&solution_path, exercise_files.solution)
.with_context(|| format!("Failed to write the solution file {solution_path}"))?;
Ok(solution_path)
}
}
#[cfg(test)]
mod tests {
use serde::Deserialize;
use super::*;
#[derive(Deserialize)]
struct ExerciseInfo {
dir: String,
}
#[derive(Deserialize)]
struct InfoFile {
exercises: Vec<ExerciseInfo>,
}
#[test]
fn dirs() {
let exercises = toml::de::from_str::<InfoFile>(EMBEDDED_FILES.info_file)
.expect("Failed to parse `info.toml`")
.exercises;
assert_eq!(exercises.len(), EMBEDDED_FILES.exercise_files.len());
for (exercise, exercise_files) in exercises.iter().zip(EMBEDDED_FILES.exercise_files) {
assert_eq!(
exercise.dir,
EMBEDDED_FILES.exercise_dirs[exercise_files.dir_ind].name,
);
}
}
}
|
