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Document init
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24
src/init.rs
24
src/init.rs
@ -11,8 +11,11 @@ use std::{
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use crate::{cargo_toml::updated_cargo_toml, embedded::EMBEDDED_FILES, info_file::InfoFile};
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pub fn init() -> Result<()> {
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if Path::new("exercises").is_dir() && Path::new("Cargo.toml").is_file() {
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bail!(PROBABLY_IN_RUSTLINGS_DIR_ERR);
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// Prevent initialization in a directory that contains the file `Cargo.toml`.
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// This can mean that Rustlings was already initialized in this directory.
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// Otherwise, this can cause problems with Cargo workspaces.
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if Path::new("Cargo.toml").exists() {
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bail!(CARGO_TOML_EXISTS_ERR);
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}
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let rustlings_path = Path::new("rustlings");
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@ -24,7 +27,7 @@ pub fn init() -> Result<()> {
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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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.context("Failed to change the current directory to `rustlings/`")?;
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let info_file = InfoFile::parse()?;
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EMBEDDED_FILES
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@ -37,9 +40,10 @@ pub fn init() -> Result<()> {
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.as_bytes()
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.iter()
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.position(|c| *c == b'\n')
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.context("The embedded `Cargo.toml` is empty or contains only one line.")?;
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let current_cargo_toml =
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¤t_cargo_toml[(newline_ind + 1).min(current_cargo_toml.len() - 1)..];
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.context("The embedded `Cargo.toml` is empty or contains only one line")?;
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let current_cargo_toml = current_cargo_toml
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.get(newline_ind + 1..)
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.context("The embedded `Cargo.toml` contains only one line")?;
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let updated_cargo_toml = updated_cargo_toml(&info_file.exercises, current_cargo_toml, b"")
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.context("Failed to generate `Cargo.toml`")?;
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fs::write("Cargo.toml", updated_cargo_toml)
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@ -77,12 +81,10 @@ target
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pub const VS_CODE_EXTENSIONS_JSON: &[u8] = br#"{"recommendations":["rust-lang.rust-analyzer"]}"#;
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const PROBABLY_IN_RUSTLINGS_DIR_ERR: &str =
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"A directory with the name `exercises` and a file with the name `Cargo.toml` already exist
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in the current directory. It looks like Rustlings was already initialized here.
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Run `rustlings` for instructions on getting started with the exercises.
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const CARGO_TOML_EXISTS_ERR: &str = "The current directory contains the file `Cargo.toml`.
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If you didn't already initialize Rustlings, please initialize it in another directory.";
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If you already initialized Rustlings, run the command `rustlings` for instructions on getting started with the exercises.
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Otherwise, please run `rustlings init` again in another directory.";
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const RUSTLINGS_DIR_ALREADY_EXISTS_ERR: &str =
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"A directory with the name `rustlings` already exists in the current directory.
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