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|
use crate::exercise::{Exercise, ExerciseList};
use crate::run::run;
use crate::verify::verify;
use clap::{crate_version, App, Arg, SubCommand};
use notify::DebouncedEvent;
use notify::{RecommendedWatcher, RecursiveMode, Watcher};
use std::ffi::OsStr;
use std::fs;
use std::io;
use std::path::Path;
use std::process::{Command, Stdio};
use std::sync::mpsc::channel;
use std::sync::{Arc, Mutex};
use std::thread;
use std::time::Duration;
mod exercise;
mod run;
mod verify;
fn main() {
let matches = App::new("rustlings")
.version(crate_version!())
.author("Olivia Hugger, Carol Nichols")
.about("Rustlings is a collection of small exercises to get you used to writing and reading Rust code")
.subcommand(SubCommand::with_name("verify").alias("v").about("Verifies all exercises according to the recommended order"))
.subcommand(SubCommand::with_name("watch").alias("w").about("Reruns `verify` when files were edited"))
.subcommand(
SubCommand::with_name("run")
.alias("r")
.about("Runs/Tests a single exercise")
.arg(Arg::with_name("name").required(true).index(1)),
)
.subcommand(
SubCommand::with_name("hint")
.alias("h")
.about("Returns a hint for the current exercise")
.arg(Arg::with_name("name").required(true).index(1)),
)
.get_matches();
if None == matches.subcommand_name() {
println!();
println!(r#" welcome to... "#);
println!(r#" _ _ _ "#);
println!(r#" _ __ _ _ ___| |_| (_)_ __ __ _ ___ "#);
println!(r#" | '__| | | / __| __| | | '_ \ / _` / __| "#);
println!(r#" | | | |_| \__ \ |_| | | | | | (_| \__ \ "#);
println!(r#" |_| \__,_|___/\__|_|_|_| |_|\__, |___/ "#);
println!(r#" |___/ "#);
println!();
}
if !Path::new("info.toml").exists() {
println!(
"{} must be run from the rustlings directory",
std::env::current_exe().unwrap().to_str().unwrap()
);
println!("Try `cd rustlings/`!");
std::process::exit(1);
}
if !rustc_exists() {
println!("We cannot find `rustc`.");
println!("Try running `rustc --version` to diagnose your problem.");
println!("For instructions on how to install Rust, check the README.");
std::process::exit(1);
}
let toml_str = &fs::read_to_string("info.toml").unwrap();
let exercises = toml::from_str::<ExerciseList>(toml_str).unwrap().exercises;
if let Some(ref matches) = matches.subcommand_matches("run") {
let name = matches.value_of("name").unwrap();
let matching_exercise = |e: &&Exercise| name == e.name;
let exercise = exercises.iter().find(matching_exercise).unwrap_or_else(|| {
println!("No exercise found for your given name!");
std::process::exit(1)
});
run(&exercise).unwrap_or_else(|_| std::process::exit(1));
}
if let Some(ref matches) = matches.subcommand_matches("hint") {
let name = matches.value_of("name").unwrap();
let exercise = exercises
.iter()
.find(|e| name == e.name)
.unwrap_or_else(|| {
println!("No exercise found for your given name!");
std::process::exit(1)
});
println!("{}", exercise.hint);
}
if matches.subcommand_matches("verify").is_some() {
verify(&exercises).unwrap_or_else(|_| std::process::exit(1));
}
if matches.subcommand_matches("watch").is_some() {
watch(&exercises).unwrap();
}
if matches.subcommand_name().is_none() {
let text = fs::read_to_string("default_out.txt").unwrap();
println!("{}", text);
}
}
fn spawn_watch_shell(failed_exercise_hint: &Arc<Mutex<Option<String>>>) {
let failed_exercise_hint = Arc::clone(failed_exercise_hint);
println!("Type 'hint' to get help");
thread::spawn(move || loop {
let mut input = String::new();
match io::stdin().read_line(&mut input) {
Ok(_) => {
if input.trim().eq("hint") {
if let Some(hint) = &*failed_exercise_hint.lock().unwrap() {
println!("{}", hint);
}
} else {
println!("unknown command: {}", input);
}
}
Err(error) => println!("error reading command: {}", error),
}
});
}
fn watch(exercises: &[Exercise]) -> notify::Result<()> {
/* Clears the terminal with an ANSI escape code.
Works in UNIX and newer Windows terminals. */
fn clear_screen() {
println!("\x1Bc");
}
let (tx, rx) = channel();
let mut watcher: RecommendedWatcher = Watcher::new(tx, Duration::from_secs(2))?;
watcher.watch(Path::new("./exercises"), RecursiveMode::Recursive)?;
clear_screen();
let verify_result = verify(exercises.iter());
let to_owned_hint = |t: &Exercise| t.hint.to_owned();
let failed_exercise_hint = Arc::new(Mutex::new(verify_result.map_err(to_owned_hint).err()));
spawn_watch_shell(&failed_exercise_hint);
loop {
match rx.recv() {
Ok(event) => match event {
DebouncedEvent::Create(b) | DebouncedEvent::Chmod(b) | DebouncedEvent::Write(b) => {
if b.extension() == Some(OsStr::new("rs")) && b.exists() {
let filepath = b.as_path().canonicalize().unwrap();
let pending_exercises = exercises
.iter()
.skip_while(|e| !filepath.ends_with(&e.path));
clear_screen();
let verify_result = verify(pending_exercises);
let mut failed_exercise_hint = failed_exercise_hint.lock().unwrap();
*failed_exercise_hint = verify_result.map_err(to_owned_hint).err();
}
}
_ => {}
},
Err(e) => println!("watch error: {:?}", e),
}
}
}
fn rustc_exists() -> bool {
Command::new("rustc")
.args(&["--version"])
.stdout(Stdio::null())
.spawn()
.and_then(|mut child| child.wait())
.map(|status| status.success())
.unwrap_or(false)
}
|
