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use anyhow::{bail, Context, Result};
use crossterm::style::Stylize;
use std::{
env::set_current_dir,
fs::{self, create_dir},
io::ErrorKind,
path::Path,
process::{Command, Stdio},
};
use crate::{cargo_toml::updated_cargo_toml, embedded::EMBEDDED_FILES, info_file::InfoFile};
pub fn init() -> 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`")?;
let info_file = InfoFile::parse()?;
EMBEDDED_FILES
.init_exercises_dir(&info_file.exercises)
.context("Failed to initialize the `rustlings/exercises` directory")?;
let current_cargo_toml = include_str!("../dev/Cargo.toml");
// Skip the first line (comment).
let newline_ind = current_cargo_toml
.as_bytes()
.iter()
.position(|c| *c == b'\n')
.context("The embedded `Cargo.toml` is empty or contains only one line.")?;
let current_cargo_toml =
¤t_cargo_toml[(newline_ind + 1).min(current_cargo_toml.len() - 1)..];
let updated_cargo_toml = updated_cargo_toml(&info_file.exercises, current_cargo_toml, b"")
.context("Failed to generate `Cargo.toml`")?;
fs::write("Cargo.toml", updated_cargo_toml)
.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`")?;
// Ignore any Git error because Git initialization is not required.
let _ = Command::new("git")
.arg("init")
.stdin(Stdio::null())
.stderr(Stdio::null())
.status();
println!(
"\n{}\n\n{}",
"Initialization done ✓".green(),
POST_INIT_MSG.bold(),
);
Ok(())
}
const GITIGNORE: &[u8] = b".rustlings-state.txt
Cargo.lock
target
.vscode
";
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 = "Run `cd rustlings` to go into the generated directory.
Then run `rustlings` to get started.";
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