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use anyhow::{bail, Context, Error, Result};
use serde::Deserialize;
use std::fs;
// The mode of the exercise.
#[derive(Deserialize, Copy, Clone)]
#[serde(rename_all = "lowercase")]
pub enum Mode {
// The exercise should be compiled as a binary
Run,
// The exercise should be compiled as a test harness
Test,
// The exercise should be linted with clippy
Clippy,
}
// Deserialized from the `info.toml` file.
#[derive(Deserialize)]
pub struct ExerciseInfo {
// Name of the exercise
pub name: String,
// The exercise's directory inside the `exercises` directory
pub dir: Option<String>,
// The mode of the exercise
pub mode: Mode,
// The hint text associated with the exercise
pub hint: String,
}
impl ExerciseInfo {
pub fn path(&self) -> String {
if let Some(dir) = &self.dir {
format!("exercises/{dir}/{}.rs", self.name)
} else {
format!("exercises/{}.rs", self.name)
}
}
}
#[derive(Deserialize)]
pub struct InfoFile {
pub welcome_message: Option<String>,
pub final_message: Option<String>,
pub exercises: Vec<ExerciseInfo>,
}
impl InfoFile {
pub fn parse() -> Result<Self> {
// Read a local `info.toml` if it exists.
let slf: Self = match fs::read_to_string("info.toml") {
Ok(file_content) => toml_edit::de::from_str(&file_content)
.context("Failed to parse the `info.toml` file")?,
Err(e) => match e.kind() {
std::io::ErrorKind::NotFound => {
toml_edit::de::from_str(include_str!("../info.toml"))
.context("Failed to parse the embedded `info.toml` file")?
}
_ => return Err(Error::from(e).context("Failed to read the `info.toml` file")),
},
};
if slf.exercises.is_empty() {
bail!("{NO_EXERCISES_ERR}");
}
let mut names_set = hashbrown::HashSet::with_capacity(slf.exercises.len());
for exercise in &slf.exercises {
if !names_set.insert(exercise.name.as_str()) {
bail!("Exercise names must all be unique!")
}
}
drop(names_set);
Ok(slf)
}
}
const NO_EXERCISES_ERR: &str = "There are no exercises yet!
If you are developing third-party exercises, add at least one exercise before testing.";
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