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use anyhow::{Context, Result};
use serde::Deserialize;
use std::{
fmt::{self, Debug, Display, Formatter},
fs::{self},
path::PathBuf,
process::{Command, Output},
};
use crate::embedded::{WriteStrategy, EMBEDDED_FILES};
// The mode of the exercise.
#[derive(Deserialize, Copy, Clone)]
#[serde(rename_all = "lowercase")]
pub enum Mode {
// The exercise should be compiled as a binary
Compile,
// The exercise should be compiled as a test harness
Test,
// The exercise should be linted with clippy
Clippy,
}
#[derive(Deserialize)]
#[serde(deny_unknown_fields)]
pub struct InfoFile {
// TODO
pub welcome_message: Option<String>,
pub final_message: Option<String>,
pub exercises: Vec<Exercise>,
}
impl InfoFile {
pub fn parse() -> Result<Self> {
// Read a local `info.toml` if it exists.
// Mainly to let the tests work for now.
let slf: Self = if let Ok(file_content) = fs::read_to_string("info.toml") {
toml_edit::de::from_str(&file_content)
} else {
toml_edit::de::from_str(include_str!("../info.toml"))
}
.context("Failed to parse `info.toml`")?;
if slf.exercises.is_empty() {
panic!("{NO_EXERCISES_ERR}");
}
Ok(slf)
}
}
// Deserialized from the `info.toml` file.
#[derive(Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Exercise {
// Name of the exercise
pub name: String,
// The path to the file containing the exercise's source code
pub path: PathBuf,
// The mode of the exercise
pub mode: Mode,
// The hint text associated with the exercise
pub hint: String,
}
impl Exercise {
fn cargo_cmd(&self, command: &str, args: &[&str]) -> Result<Output> {
let mut cmd = Command::new("cargo");
cmd.arg(command);
// A hack to make `cargo run` work when developing Rustlings.
// Use `dev/Cargo.toml` when in the directory of the repository.
#[cfg(debug_assertions)]
if std::path::Path::new("tests").exists() {
cmd.arg("--manifest-path").arg("dev/Cargo.toml");
}
cmd.arg("--color")
.arg("always")
.arg("-q")
.arg("--bin")
.arg(&self.name)
.args(args)
.output()
.context("Failed to run Cargo")
}
pub fn run(&self) -> Result<Output> {
match self.mode {
Mode::Compile => self.cargo_cmd("run", &[]),
Mode::Test => self.cargo_cmd("test", &["--", "--nocapture", "--format", "pretty"]),
Mode::Clippy => self.cargo_cmd(
"clippy",
&["--", "-D", "warnings", "-D", "clippy::float_cmp"],
),
}
}
pub fn reset(&self) -> Result<()> {
EMBEDDED_FILES
.write_exercise_to_disk(&self.path, WriteStrategy::Overwrite)
.with_context(|| format!("Failed to reset the exercise {self}"))
}
}
impl Display for Exercise {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
Display::fmt(&self.path.display(), f)
}
}
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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