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use anyhow::{bail, Context, Result};
use std::{
env::set_current_dir,
fs::{self, create_dir},
io::ErrorKind,
path::Path,
};
use crate::{embedded::EMBEDDED_FILES, info_file::ExerciseInfo};
fn cargo_toml(exercise_infos: &[ExerciseInfo]) -> Vec<u8> {
let mut cargo_toml = Vec::with_capacity(1 << 13);
cargo_toml.extend_from_slice(b"bin = [\n");
for exercise_info in exercise_infos {
cargo_toml.extend_from_slice(b" { name = \"");
cargo_toml.extend_from_slice(exercise_info.name.as_bytes());
cargo_toml.extend_from_slice(b"\", path = \"exercises/");
if let Some(dir) = &exercise_info.dir {
cargo_toml.extend_from_slice(dir.as_bytes());
cargo_toml.push(b'/');
}
cargo_toml.extend_from_slice(exercise_info.name.as_bytes());
cargo_toml.extend_from_slice(b".rs\" },\n");
}
cargo_toml.extend_from_slice(b"]\n\n");
cargo_toml.extend_from_slice(CARGO_TOML_PACKAGE.as_bytes());
cargo_toml
}
pub fn init(exercise_infos: &[ExerciseInfo]) -> Result<()> {
if Path::new("exercises").is_dir() && Path::new("Cargo.toml").is_file() {
bail!(PROBABLY_IN_RUSTLINGS_DIR_ERR);
}
let rustlings_path = Path::new("rustlings");
if let Err(e) = create_dir(rustlings_path) {
if e.kind() == ErrorKind::AlreadyExists {
bail!(RUSTLINGS_DIR_ALREADY_EXISTS_ERR);
}
return Err(e.into());
}
set_current_dir("rustlings")
.context("Failed to change the current directory to `rustlings`")?;
EMBEDDED_FILES
.init_exercises_dir()
.context("Failed to initialize the `rustlings/exercises` directory")?;
fs::write("Cargo.toml", cargo_toml(exercise_infos))
.context("Failed to create the file `rustlings/Cargo.toml`")?;
fs::write(".gitignore", GITIGNORE)
.context("Failed to create the file `rustlings/.gitignore`")?;
create_dir(".vscode").context("Failed to create the directory `rustlings/.vscode`")?;
fs::write(".vscode/extensions.json", VS_CODE_EXTENSIONS_JSON)
.context("Failed to create the file `rustlings/.vscode/extensions.json`")?;
println!("{POST_INIT_MSG}");
Ok(())
}
pub const CARGO_TOML_PACKAGE: &str = r#"[package]
name = "rustlings"
edition = "2021"
publish = false
"#;
pub const GITIGNORE: &[u8] = b"Cargo.lock
.rustlings-state.txt
target
";
pub const VS_CODE_EXTENSIONS_JSON: &[u8] = br#"{"recommendations":["rust-lang.rust-analyzer"]}"#;
const PROBABLY_IN_RUSTLINGS_DIR_ERR: &str =
"A directory with the name `exercises` and a file with the name `Cargo.toml` already exist
in the current directory. It looks like Rustlings was already initialized here.
Run `rustlings` for instructions on getting started with the exercises.
If you didn't already initialize Rustlings, please initialize it in another directory.";
const RUSTLINGS_DIR_ALREADY_EXISTS_ERR: &str =
"A directory with the name `rustlings` already exists in the current directory.
You probably already initialized Rustlings.
Run `cd rustlings`
Then run `rustlings` again";
const POST_INIT_MSG: &str = "Done initialization!
Run `cd rustlings` to go into the generated directory.
Then run `rustlings` to get started.";
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