rustlings/src/main.rs

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Rust
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use crate::exercise::{Exercise, ExerciseList};
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use crate::run::run;
use crate::verify::verify;
use clap::{crate_version, App, Arg, SubCommand};
use notify::DebouncedEvent;
use notify::{RecommendedWatcher, RecursiveMode, Watcher};
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use std::ffi::OsStr;
use std::fs;
use std::io::BufRead;
use std::path::Path;
use std::sync::mpsc::channel;
use std::time::Duration;
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use syntect::easy::HighlightFile;
use syntect::highlighting::{Style, ThemeSet};
use syntect::parsing::SyntaxSet;
use syntect::util::as_24_bit_terminal_escaped;
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mod exercise;
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mod run;
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mod verify;
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fn main() {
let matches = App::new("rustlings")
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.version(crate_version!())
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.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"))
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.subcommand(
SubCommand::with_name("run")
.alias("r")
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.about("Runs/Tests a single exercise")
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.arg(Arg::with_name("file").required(true).index(1))
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.arg(Arg::with_name("test").short("t").long("test").help("Run the file as a test")),
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)
.get_matches();
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let ss = SyntaxSet::load_defaults_newlines();
let ts = ThemeSet::load_defaults();
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if None == matches.subcommand_name() {
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println!();
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println!(r#" welcome to... "#);
println!(r#" _ _ _ "#);
println!(r#" _ __ _ _ ___| |_| (_)_ __ __ _ ___ "#);
println!(r#" | '__| | | / __| __| | | '_ \ / _` / __| "#);
println!(r#" | | | |_| \__ \ |_| | | | | | (_| \__ \ "#);
println!(r#" |_| \__,_|___/\__|_|_|_| |_|\__, |___/ "#);
println!(r#" |___/ "#);
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println!();
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}
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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);
}
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 filename = matches.value_of("file").unwrap_or_else(|| {
println!("Please supply a file name!");
std::process::exit(1);
});
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let matching_exercise = |e: &&Exercise| {
Path::new(filename)
.canonicalize()
.map(|p| p.ends_with(&e.path))
.unwrap_or(false)
};
let exercise = exercises.iter().find(matching_exercise).unwrap_or_else(|| {
println!("No exercise found for your file name!");
std::process::exit(1)
});
run(&exercise).unwrap_or_else(|_| std::process::exit(1));
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}
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if matches.subcommand_matches("verify").is_some() {
verify(&exercises).unwrap_or_else(|_| std::process::exit(1));
}
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if matches.subcommand_matches("watch").is_some() {
watch(&exercises).unwrap();
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}
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if matches.subcommand_name().is_none() {
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let mut highlighter =
HighlightFile::new("default_out.md", &ss, &ts.themes["base16-eighties.dark"]).unwrap();
for maybe_line in highlighter.reader.lines() {
let line = maybe_line.unwrap();
let regions: Vec<(Style, &str)> = highlighter.highlight_lines.highlight(&line, &ss);
println!("{}", as_24_bit_terminal_escaped(&regions[..], true));
}
}
println!("\x1b[0m");
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}
fn watch(exercises: &[Exercise]) -> notify::Result<()> {
let (tx, rx) = channel();
let mut watcher: RecommendedWatcher = Watcher::new(tx, Duration::from_secs(2))?;
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watcher.watch(Path::new("./exercises"), RecursiveMode::Recursive)?;
let _ignored = verify(exercises.iter());
loop {
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match rx.recv() {
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Ok(event) => match event {
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DebouncedEvent::Create(b) | DebouncedEvent::Chmod(b) | DebouncedEvent::Write(b) => {
if b.extension() == Some(OsStr::new("rs")) {
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println!("----------**********----------\n");
let filepath = b.as_path().canonicalize().unwrap();
let exercise = exercises
.iter()
.skip_while(|e| !filepath.ends_with(&e.path));
let _ignored = verify(exercise);
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}
}
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_ => {}
},
Err(e) => println!("watch error: {:?}", e),
}
}
}