408 lines
16 KiB
Rust
408 lines
16 KiB
Rust
use crate::exercise::{Exercise, ExerciseList};
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use crate::run::run;
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use crate::verify::verify;
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use argh::FromArgs;
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use console::Emoji;
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use notify::DebouncedEvent;
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use notify::{RecommendedWatcher, RecursiveMode, Watcher};
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use std::ffi::OsStr;
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use std::fs;
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use std::io::{self, prelude::*};
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use std::path::Path;
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use std::process::{Command, Stdio};
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::mpsc::{channel, RecvTimeoutError};
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use std::sync::{Arc, Mutex};
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use std::thread;
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use std::time::Duration;
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#[macro_use]
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mod ui;
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mod exercise;
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mod run;
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mod verify;
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// In sync with crate version
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const VERSION: &str = "4.7.1";
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#[derive(FromArgs, PartialEq, Debug)]
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/// Rustlings is a collection of small exercises to get you used to writing and reading Rust code
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struct Args {
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/// show outputs from the test exercises
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#[argh(switch)]
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nocapture: bool,
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/// show the executable version
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#[argh(switch, short = 'v')]
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version: bool,
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#[argh(subcommand)]
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nested: Option<Subcommands>,
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}
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#[derive(FromArgs, PartialEq, Debug)]
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#[argh(subcommand)]
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enum Subcommands {
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Verify(VerifyArgs),
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Watch(WatchArgs),
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Run(RunArgs),
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Hint(HintArgs),
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List(ListArgs),
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}
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#[derive(FromArgs, PartialEq, Debug)]
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#[argh(subcommand, name = "verify")]
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/// Verifies all exercises according to the recommended order
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struct VerifyArgs {}
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#[derive(FromArgs, PartialEq, Debug)]
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#[argh(subcommand, name = "watch")]
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/// Reruns `verify` when files were edited
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struct WatchArgs {}
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#[derive(FromArgs, PartialEq, Debug)]
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#[argh(subcommand, name = "run")]
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/// Runs/Tests a single exercise
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struct RunArgs {
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#[argh(positional)]
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/// the name of the exercise
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name: String,
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}
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#[derive(FromArgs, PartialEq, Debug)]
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#[argh(subcommand, name = "hint")]
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/// Returns a hint for the given exercise
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struct HintArgs {
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#[argh(positional)]
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/// the name of the exercise
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name: String,
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}
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#[derive(FromArgs, PartialEq, Debug)]
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#[argh(subcommand, name = "list")]
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/// Lists the exercises available in Rustlings
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struct ListArgs {
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#[argh(switch, short = 'p')]
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/// show only the paths of the exercises
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paths: bool,
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#[argh(switch, short = 'n')]
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/// show only the names of the exercises
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names: bool,
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#[argh(option, short = 'f')]
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/// provide a string to match exercise names
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/// comma separated patterns are acceptable
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filter: Option<String>,
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#[argh(switch, short = 'u')]
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/// display only exercises not yet solved
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unsolved: bool,
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#[argh(switch, short = 's')]
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/// display only exercises that have been solved
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solved: bool,
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}
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fn main() {
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let args: Args = argh::from_env();
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if args.version {
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println!("v{}", VERSION);
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std::process::exit(0);
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}
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if args.nested.is_none() {
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println!("\n{}\n", WELCOME);
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}
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if !Path::new("info.toml").exists() {
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println!(
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"{} must be run from the rustlings directory",
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std::env::current_exe().unwrap().to_str().unwrap()
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);
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println!("Try `cd rustlings/`!");
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std::process::exit(1);
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}
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if !rustc_exists() {
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println!("We cannot find `rustc`.");
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println!("Try running `rustc --version` to diagnose your problem.");
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println!("For instructions on how to install Rust, check the README.");
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std::process::exit(1);
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}
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let toml_str = &fs::read_to_string("info.toml").unwrap();
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let exercises = toml::from_str::<ExerciseList>(toml_str).unwrap().exercises;
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let verbose = args.nocapture;
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let command = args.nested.unwrap_or_else(|| {
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println!("{}\n", DEFAULT_OUT);
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std::process::exit(0);
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});
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match command {
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Subcommands::List(subargs) => {
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if !subargs.paths && !subargs.names {
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println!("{:<17}\t{:<46}\t{:<7}", "Name", "Path", "Status");
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}
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let mut exercises_done: u16 = 0;
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let filters = subargs.filter.clone().unwrap_or_default().to_lowercase();
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exercises.iter().for_each(|e| {
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let fname = format!("{}", e.path.display());
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let filter_cond = filters
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.split(',')
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.filter(|f| !f.trim().is_empty())
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.any(|f| e.name.contains(&f) || fname.contains(&f));
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let status = if e.looks_done() {
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exercises_done += 1;
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"Done"
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} else {
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"Pending"
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};
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let solve_cond = {
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(e.looks_done() && subargs.solved) || (!e.looks_done() && subargs.unsolved) || (!subargs.solved && !subargs.unsolved)
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};
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if solve_cond && (filter_cond || subargs.filter.is_none()) {
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let line = if subargs.paths {
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format!("{}\n", fname)
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} else if subargs.names {
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format!("{}\n", e.name)
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} else {
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format!("{:<17}\t{:<46}\t{:<7}\n", e.name, fname, status)
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};
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// Somehow using println! leads to the binary panicking
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// when its output is piped.
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// So, we're handling a Broken Pipe error and exiting with 0 anyway
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let stdout = std::io::stdout();
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{
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let mut handle = stdout.lock();
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handle.write_all(line.as_bytes()).unwrap_or_else(|e| {
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match e.kind() {
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std::io::ErrorKind::BrokenPipe => std::process::exit(0),
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_ => std::process::exit(1),
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};
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});
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}
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}
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});
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let percentage_progress = exercises_done as f32 / exercises.len() as f32 * 100.0;
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println!(
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"Progress: You completed {} / {} exercises ({:.2} %).",
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exercises_done,
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exercises.len(),
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percentage_progress
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);
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std::process::exit(0);
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}
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Subcommands::Run(subargs) => {
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let exercise = find_exercise(&subargs.name, &exercises);
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run(exercise, verbose).unwrap_or_else(|_| std::process::exit(1));
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}
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Subcommands::Hint(subargs) => {
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let exercise = find_exercise(&subargs.name, &exercises);
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println!("{}", exercise.hint);
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}
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Subcommands::Verify(_subargs) => {
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verify(&exercises, (0, exercises.len()), verbose).unwrap_or_else(|_| std::process::exit(1));
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}
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Subcommands::Watch(_subargs) => match watch(&exercises, verbose) {
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Err(e) => {
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println!("Error: Could not watch your progress. Error message was {:?}.", e);
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println!("Most likely you've run out of disk space or your 'inotify limit' has been reached.");
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std::process::exit(1);
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}
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Ok(WatchStatus::Finished) => {
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println!("{emoji} All exercises completed! {emoji}", emoji = Emoji("🎉", "★"));
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println!("\n{}\n", FENISH_LINE);
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}
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Ok(WatchStatus::Unfinished) => {
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println!("We hope you're enjoying learning about Rust!");
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println!("If you want to continue working on the exercises at a later point, you can simply run `rustlings watch` again");
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}
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},
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}
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}
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fn spawn_watch_shell(failed_exercise_hint: &Arc<Mutex<Option<String>>>, should_quit: Arc<AtomicBool>) {
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let failed_exercise_hint = Arc::clone(failed_exercise_hint);
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println!("Welcome to watch mode! You can type 'help' to get an overview of the commands you can use here.");
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thread::spawn(move || loop {
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let mut input = String::new();
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match io::stdin().read_line(&mut input) {
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Ok(_) => {
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let input = input.trim();
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if input == "hint" {
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if let Some(hint) = &*failed_exercise_hint.lock().unwrap() {
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println!("{}", hint);
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}
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} else if input == "clear" {
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println!("\x1B[2J\x1B[1;1H");
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} else if input.eq("quit") {
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should_quit.store(true, Ordering::SeqCst);
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println!("Bye!");
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} else if input.eq("help") {
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println!("Commands available to you in watch mode:");
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println!(" hint - prints the current exercise's hint");
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println!(" clear - clears the screen");
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println!(" quit - quits watch mode");
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println!(" help - displays this help message");
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println!();
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println!("Watch mode automatically re-evaluates the current exercise");
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println!("when you edit a file's contents.")
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} else {
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println!("unknown command: {}", input);
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}
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}
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Err(error) => println!("error reading command: {}", error),
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}
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});
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}
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fn find_exercise<'a>(name: &str, exercises: &'a [Exercise]) -> &'a Exercise {
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if name.eq("next") {
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exercises.iter().find(|e| !e.looks_done()).unwrap_or_else(|| {
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println!("🎉 Congratulations! You have done all the exercises!");
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println!("🔚 There are no more exercises to do next!");
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std::process::exit(1)
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})
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} else {
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exercises.iter().find(|e| e.name == name).unwrap_or_else(|| {
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println!("No exercise found for '{}'!", name);
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std::process::exit(1)
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})
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}
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}
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enum WatchStatus {
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Finished,
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Unfinished,
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}
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fn watch(exercises: &[Exercise], verbose: bool) -> notify::Result<WatchStatus> {
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/* Clears the terminal with an ANSI escape code.
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Works in UNIX and newer Windows terminals. */
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fn clear_screen() {
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println!("\x1Bc");
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}
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let (tx, rx) = channel();
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let should_quit = Arc::new(AtomicBool::new(false));
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let mut watcher: RecommendedWatcher = Watcher::new(tx, Duration::from_secs(2))?;
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watcher.watch(Path::new("./exercises"), RecursiveMode::Recursive)?;
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clear_screen();
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let to_owned_hint = |t: &Exercise| t.hint.to_owned();
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let failed_exercise_hint = match verify(exercises.iter(), (0, exercises.len()), verbose) {
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Ok(_) => return Ok(WatchStatus::Finished),
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Err(exercise) => Arc::new(Mutex::new(Some(to_owned_hint(exercise)))),
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};
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spawn_watch_shell(&failed_exercise_hint, Arc::clone(&should_quit));
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loop {
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match rx.recv_timeout(Duration::from_secs(1)) {
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Ok(event) => match event {
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DebouncedEvent::Create(b) | DebouncedEvent::Chmod(b) | DebouncedEvent::Write(b) => {
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if b.extension() == Some(OsStr::new("rs")) && b.exists() {
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let filepath = b.as_path().canonicalize().unwrap();
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let pending_exercises = exercises
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.iter()
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.find(|e| filepath.ends_with(&e.path)).into_iter()
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.chain(exercises.iter().filter(|e| !e.looks_done() && !filepath.ends_with(&e.path)));
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let num_done = exercises.iter().filter(|e| e.looks_done()).count();
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clear_screen();
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match verify(pending_exercises, (num_done, exercises.len()), verbose) {
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Ok(_) => return Ok(WatchStatus::Finished),
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Err(exercise) => {
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let mut failed_exercise_hint = failed_exercise_hint.lock().unwrap();
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*failed_exercise_hint = Some(to_owned_hint(exercise));
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}
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}
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}
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}
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_ => {}
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},
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Err(RecvTimeoutError::Timeout) => {
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// the timeout expired, just check the `should_quit` variable below then loop again
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}
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Err(e) => println!("watch error: {:?}", e),
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}
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// Check if we need to exit
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if should_quit.load(Ordering::SeqCst) {
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return Ok(WatchStatus::Unfinished);
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}
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}
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}
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fn rustc_exists() -> bool {
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Command::new("rustc")
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.args(&["--version"])
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.stdout(Stdio::null())
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.spawn()
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.and_then(|mut child| child.wait())
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.map(|status| status.success())
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.unwrap_or(false)
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}
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const DEFAULT_OUT: &str = r#"Thanks for installing Rustlings!
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Is this your first time? Don't worry, Rustlings was made for beginners! We are
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going to teach you a lot of things about Rust, but before we can get
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started, here's a couple of notes about how Rustlings operates:
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1. The central concept behind Rustlings is that you solve exercises. These
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exercises usually have some sort of syntax error in them, which will cause
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them to fail compilation or testing. Sometimes there's a logic error instead
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of a syntax error. No matter what error, it's your job to find it and fix it!
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You'll know when you fixed it because then, the exercise will compile and
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Rustlings will be able to move on to the next exercise.
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2. If you run Rustlings in watch mode (which we recommend), it'll automatically
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start with the first exercise. Don't get confused by an error message popping
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up as soon as you run Rustlings! This is part of the exercise that you're
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supposed to solve, so open the exercise file in an editor and start your
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detective work!
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3. If you're stuck on an exercise, there is a helpful hint you can view by typing
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'hint' (in watch mode), or running `rustlings hint exercise_name`.
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4. If an exercise doesn't make sense to you, feel free to open an issue on GitHub!
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(https://github.com/rust-lang/rustlings/issues/new). We look at every issue,
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and sometimes, other learners do too so you can help each other out!
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Got all that? Great! To get started, run `rustlings watch` in order to get the first
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exercise. Make sure to have your editor open!"#;
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const FENISH_LINE: &str = r#"+----------------------------------------------------+
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| You made it to the Fe-nish line! |
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+-------------------------- ------------------------+
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\\/
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▒▒ ▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒ ▒▒
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▒▒▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒▒▒
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▒▒▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒▒▒
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░░▒▒▒▒░░▒▒ ▒▒ ▒▒ ▒▒ ▒▒░░▒▒▒▒
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▓▓▓▓▓▓▓▓ ▓▓ ▓▓██ ▓▓ ▓▓██ ▓▓ ▓▓▓▓▓▓▓▓
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▒▒▒▒ ▒▒ ████ ▒▒ ████ ▒▒░░ ▒▒▒▒
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▒▒ ▒▒▒▒▒▒ ▒▒▒▒▒▒ ▒▒▒▒▒▒ ▒▒
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▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒▒▒▒▒▒▒▒▓▓▒▒▓▓▒▒▒▒▒▒▒▒
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▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
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▒▒▒▒▒▒▒▒▒▒██▒▒▒▒▒▒██▒▒▒▒▒▒▒▒▒▒
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▒▒ ▒▒▒▒▒▒▒▒▒▒██████▒▒▒▒▒▒▒▒▒▒ ▒▒
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▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ▒▒
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▒▒ ▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ▒▒ ▒▒
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▒▒ ▒▒ ▒▒ ▒▒ ▒▒ ▒▒
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▒▒ ▒▒ ▒▒ ▒▒
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We hope you enjoyed learning about the various aspects of Rust!
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If you noticed any issues, please don't hesitate to report them to our repo.
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You can also contribute your own exercises to help the greater community!
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Before reporting an issue or contributing, please read our guidelines:
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https://github.com/rust-lang/rustlings/blob/main/CONTRIBUTING.md"#;
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const WELCOME: &str = r#" welcome to...
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_ _ _
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_ __ _ _ ___| |_| (_)_ __ __ _ ___
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| '__| | | / __| __| | | '_ \ / _` / __|
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| | | |_| \__ \ |_| | | | | | (_| \__ \
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|_| \__,_|___/\__|_|_|_| |_|\__, |___/
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|___/"#;
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