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use anyhow::{Context, Result};
use clap::{Parser, Subcommand};
use std::{path::Path, process::exit};
mod app_state;
mod embedded;
mod exercise;
mod init;
mod list;
mod progress_bar;
mod run;
mod watch;
use self::{
app_state::AppState,
exercise::InfoFile,
init::init,
list::list,
run::run,
watch::{watch, WatchExit},
};
/// Rustlings is a collection of small exercises to get you used to writing and reading Rust code
#[derive(Parser)]
#[command(version)]
struct Args {
#[command(subcommand)]
command: Option<Subcommands>,
}
#[derive(Subcommand)]
enum Subcommands {
/// Initialize Rustlings
Init,
/// Run a single exercise. Runs the next pending exercise if the exercise name is not specified.
Run {
/// The name of the exercise
name: Option<String>,
},
/// Reset a single exercise
Reset {
/// The name of the exercise
name: String,
},
/// Return a hint for the given exercise
Hint {
/// The name of the exercise
name: String,
},
}
fn main() -> Result<()> {
let args = Args::parse();
which::which("cargo").context(CARGO_NOT_FOUND_ERR)?;
let mut info_file = InfoFile::parse()?;
info_file.exercises.shrink_to_fit();
let exercises = info_file.exercises;
if matches!(args.command, Some(Subcommands::Init)) {
init(&exercises).context("Initialization failed")?;
println!("{POST_INIT_MSG}");
return Ok(());
} else if !Path::new("exercises").is_dir() {
println!("{PRE_INIT_MSG}");
exit(1);
}
let mut app_state = AppState::new(exercises, info_file.final_message.unwrap_or_default());
match args.command {
None => loop {
match watch(&mut app_state)? {
WatchExit::Shutdown => break,
// It is much easier to exit the watch mode, launch the list mode and then restart
// the watch mode instead of trying to pause the watch threads and correct the
// watch state.
WatchExit::List => list(&mut app_state)?,
}
},
// `Init` is handled above.
Some(Subcommands::Init) => (),
Some(Subcommands::Run { name }) => {
if let Some(name) = name {
app_state.set_current_exercise_by_name(&name)?;
}
run(&mut app_state)?;
}
Some(Subcommands::Reset { name }) => {
app_state.set_current_exercise_by_name(&name)?;
app_state.set_pending(app_state.current_exercise_ind())?;
let exercise = app_state.current_exercise();
exercise.reset()?;
println!("The exercise {exercise} has been reset!");
}
Some(Subcommands::Hint { name }) => {
app_state.set_current_exercise_by_name(&name)?;
println!("{}", app_state.current_exercise().hint);
}
}
Ok(())
}
const CARGO_NOT_FOUND_ERR: &str = "Failed to find `cargo`.
Did you already install Rust?
Try running `cargo --version` to diagnose the problem.";
const PRE_INIT_MSG: &str = r"
welcome to...
_ _ _
_ __ _ _ ___| |_| (_)_ __ __ _ ___
| '__| | | / __| __| | | '_ \ / _` / __|
| | | |_| \__ \ |_| | | | | | (_| \__ \
|_| \__,_|___/\__|_|_|_| |_|\__, |___/
|___/
The `exercises` directory wasn't found in the current directory.
If you are just starting with Rustlings, run the command `rustlings init` to initialize it.";
const POST_INIT_MSG: &str = "
Done initialization!
Run `cd rustlings` to go into the generated directory.
Then run `rustlings` for further instructions on getting started.";
const FENISH_LINE: &str = "+----------------------------------------------------+
| You made it to the Fe-nish line! |
+-------------------------- ------------------------+
\\/\x1b[31m
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▒▒▒▒▒▒▒▒▒▒██▒▒▒▒▒▒██▒▒▒▒▒▒▒▒▒▒
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▒▒ ▒▒ ▒▒ ▒▒\x1b[0m
";
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