mirror of https://github.com/rust-lang/rustlings
Replace rust-project.json with Cargo.toml
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0f18d599e9
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use anyhow::{bail, Context, Result};
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use std::{
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env::set_current_dir,
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fs::{create_dir, OpenOptions},
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io::{self, ErrorKind, Write},
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path::Path,
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};
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use crate::{embedded::EMBEDDED_FILES, exercise::Exercise};
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fn create_cargo_toml(exercises: &[Exercise]) -> io::Result<()> {
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let mut cargo_toml = Vec::with_capacity(1 << 13);
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cargo_toml.extend_from_slice(
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br#"[package]
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name = "rustlings"
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version = "0.0.0"
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edition = "2021"
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publish = false
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"#,
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);
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for exercise in exercises {
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cargo_toml.extend_from_slice(b"\n[[bin]]\nname = \"");
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cargo_toml.extend_from_slice(exercise.name.as_bytes());
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cargo_toml.extend_from_slice(b"\"\npath = \"");
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cargo_toml.extend_from_slice(exercise.path.to_str().unwrap().as_bytes());
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cargo_toml.extend_from_slice(b"\"\n");
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}
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OpenOptions::new()
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.create_new(true)
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.write(true)
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.open("Cargo.toml")?
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.write_all(&cargo_toml)
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}
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fn create_vscode_dir() -> Result<()> {
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create_dir(".vscode").context("Failed to create the directory `.vscode`")?;
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let vs_code_extensions_json = br#"{"recommendations":["rust-lang.rust-analyzer"]}"#;
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OpenOptions::new()
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.create_new(true)
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.write(true)
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.open(".vscode/extensions.json")?
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.write_all(vs_code_extensions_json)?;
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Ok(())
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}
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pub fn init_rustlings(exercises: &[Exercise]) -> Result<()> {
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let rustlings_path = Path::new("rustlings");
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if let Err(e) = create_dir(rustlings_path) {
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if e.kind() == ErrorKind::AlreadyExists {
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bail!(
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"A directory with the name `rustligs` already exists in the current directory.
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You probably already initialized Rustlings.
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Run `cd rustlings`
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Then run `rustlings` again"
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);
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}
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return Err(e.into());
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}
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set_current_dir("rustlings")
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.context("Failed to change the current directory to `rustlings`")?;
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EMBEDDED_FILES
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.init_exercises_dir()
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.context("Failed to initialize the `rustlings/exercises` directory")?;
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create_cargo_toml(exercises).context("Failed to create the file `rustlings/Cargo.toml`")?;
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create_vscode_dir().context("Failed to create the file `rustlings/.vscode/extensions.json`")?;
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println!("\nDone initialization!\n");
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Ok(())
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}
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@ -1,83 +0,0 @@
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use anyhow::{Context, Result};
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use serde::Serialize;
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use std::env;
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use std::path::{Path, PathBuf};
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use std::process::{Command, Stdio};
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use crate::exercise::Exercise;
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/// Contains the structure of resulting rust-project.json file
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/// and functions to build the data required to create the file
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#[derive(Serialize)]
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struct RustAnalyzerProject<'a> {
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sysroot_src: PathBuf,
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crates: Vec<Crate<'a>>,
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}
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#[derive(Serialize)]
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struct Crate<'a> {
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root_module: &'a Path,
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edition: &'static str,
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// Not used, but required in the JSON file.
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deps: Vec<()>,
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// Only `test` is used for all crates.
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// Therefore, an array is used instead of a `Vec`.
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cfg: [&'static str; 1],
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}
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impl<'a> RustAnalyzerProject<'a> {
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fn build(exercises: &'a [Exercise]) -> Result<Self> {
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let crates = exercises
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.iter()
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.map(|exercise| Crate {
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root_module: &exercise.path,
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edition: "2021",
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deps: Vec::new(),
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// This allows rust_analyzer to work inside `#[test]` blocks
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cfg: ["test"],
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})
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.collect();
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if let Some(path) = env::var_os("RUST_SRC_PATH") {
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return Ok(Self {
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sysroot_src: PathBuf::from(path),
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crates,
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});
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}
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let toolchain = Command::new("rustc")
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.arg("--print")
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.arg("sysroot")
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.stderr(Stdio::inherit())
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.output()
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.context("Failed to get the sysroot from `rustc`. Do you have `rustc` installed?")?
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.stdout;
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let toolchain =
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String::from_utf8(toolchain).context("The toolchain path is invalid UTF8")?;
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let toolchain = toolchain.trim_end();
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println!("Determined toolchain: {toolchain}\n");
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let mut sysroot_src = PathBuf::with_capacity(256);
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sysroot_src.extend([toolchain, "lib", "rustlib", "src", "rust", "library"]);
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Ok(Self {
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sysroot_src,
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crates,
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})
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}
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}
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/// Write `rust-project.json` to disk.
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pub fn write_project_json(exercises: &[Exercise]) -> Result<()> {
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let content = RustAnalyzerProject::build(exercises)?;
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// Using the capacity 2^14 since the file length in bytes is higher than 2^13.
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// The final length is not known exactly because it depends on the user's sysroot path,
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// the current number of exercises etc.
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let mut buf = Vec::with_capacity(1 << 14);
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serde_json::to_writer(&mut buf, &content)?;
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std::fs::write("rust-project.json", buf)?;
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Ok(())
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}
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