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use anyhow::{bail, Context, Error, Result};
use serde::Deserialize;
use std::{fs, io::ErrorKind};
use crate::embedded::EMBEDDED_FILES;
// 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>,
#[serde(default = "default_true")]
pub test: bool,
#[serde(default)]
pub strict_clippy: bool,
// The hint text associated with the exercise
pub hint: String,
}
#[inline]
const fn default_true() -> bool {
true
}
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 format_version: u8,
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 = match fs::read_to_string("info.toml") {
Ok(file_content) => toml_edit::de::from_str::<Self>(&file_content)
.context("Failed to parse the `info.toml` file")?,
Err(e) => {
if e.kind() == ErrorKind::NotFound {
return toml_edit::de::from_str(EMBEDDED_FILES.info_file)
.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}");
}
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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