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|
use std::env;
use std::io::{self, Write};
use std::sync::{Arc, Mutex};
mod buffer;
mod path;
mod poem;
use poem::{read::Readable, recite::Reciteable, Poem};
mod compose;
use buffer::{getline, STDIN};
use compose::Environment;
use termios::{tcsetattr, Termios, ECHO, ECHOE, ICANON, TCSANOW};
/// Starts the main shell loop
///
/// # Arguments
/// * `away` - A mutex, indicating whether or not user is at the prompt
/// * `env` - The global shell state
///
/// # Examples
/// ```
/// fn main() {
/// let mut env = compose::env();
/// let mut away = Arc::new(Mutex::new(false));
/// ...
/// repl(&mut away, &mut env);
/// }
/// ```
fn repl(
away: &mut Arc<Mutex<bool>>,
buffer: &mut Arc<Mutex<Vec<u8>>>,
pos: &mut Arc<Mutex<usize>>,
env: &mut Environment,
) {
// Setup termios flags
let mut termios = Termios::from_fd(STDIN).unwrap();
// Initial path refresh on startup
env.bins = path::refresh();
// Main shell loop
loop {
// Clear the buffer
buffer.lock().unwrap().clear();
// Get the prompt
let prompt = match env::var("PS1") {
Ok(val) => val,
Err(_) => String::from("|> "),
};
// Output the prompt
print!("{}", prompt);
io::stdout().flush().unwrap();
// At the prompt
*away.lock().unwrap() = false;
// Unset ICANON and ECHO before the prompt
termios.c_lflag &= !(ICANON | ECHO);
tcsetattr(STDIN, TCSANOW, &mut termios).unwrap();
// Wait for user input
let bytes = getline(buffer, pos);
// Check if we've reached EOF (i.e. <C-d>)
if bytes == 0 {
println!();
break;
}
// Convert buffer to a string and trim it
let poetry = String::from_utf8_lossy(&buffer.lock().unwrap())
.trim()
.to_string();
// Skip parsing if there is no poetry
if poetry.is_empty() {
continue;
}
// Set ICANON and ECHO for other programs after the prompt
termios.c_lflag |= ICANON | ECHO | ECHOE;
tcsetattr(STDIN, TCSANOW, &mut termios).unwrap();
// Not at the prompt
*away.lock().unwrap() = true;
// Parse the poem
let poem = Poem::read(poetry, env);
let poem = match poem {
Ok(poem) => poem,
Err(e) => {
eprintln!("dwvsh: {}", e.to_string().to_lowercase());
continue;
}
};
// Recite the poem
match poem.recite(env) {
Ok(_) => {}
Err(e) => eprintln!("dwvsh: {}", e.to_string().to_lowercase()),
}
}
}
fn options(env: &mut Environment) {
let args: Vec<String> = env::args().collect();
for arg in args.iter() {
if arg.eq("--version") {
println!(
"dwvsh v{} ({})",
env!("CARGO_PKG_VERSION"),
env!("DWVSH_BUILD")
);
std::process::exit(0);
}
}
match args.last() {
Some(arg) => {
if args.len() > 1 && !arg.starts_with('-') {
let poetry = std::fs::read_to_string(arg)
.expect(format!("dwvsh: can't open input file: {}", arg).as_str());
let poem = Poem::read(poetry, env);
let poem = match poem {
Ok(poem) => poem,
Err(e) => {
eprintln!("dwvsh: {}", e.to_string().to_lowercase());
std::process::exit(1);
}
};
// Recite the poem
match poem.recite(env) {
Ok(_) => {}
Err(e) => eprintln!("dwvsh: {}", e.to_string().to_lowercase()),
}
// Quit
std::process::exit(0);
}
}
None => {}
}
}
/// Shell entry
///
/// Shell setup and entry
fn main() {
// Compose the environment for dwvsh
let mut env = compose::env();
// Handle signals
let mut away = Arc::new(Mutex::new(true));
let mut buffer: Arc<Mutex<Vec<u8>>> = Arc::new(Mutex::new(vec![]));
let mut pos: Arc<Mutex<usize>> = Arc::new(Mutex::new(0));
unsafe {
let away = Arc::clone(&away);
let buffer = Arc::clone(&buffer);
let pos = Arc::clone(&pos);
signal_hook::low_level::register(signal_hook::consts::SIGINT, move || {
buffer.lock().unwrap().clear();
*pos.lock().unwrap() = 0;
if *away.lock().unwrap() {
println!();
} else {
let prompt = match env::var("PS1") {
Ok(val) => val,
Err(_) => String::from("|> "),
};
print!("\n{}", prompt);
io::stdout().flush().unwrap();
}
})
.unwrap();
};
// Parse flags and other arguments
options(&mut env);
// Begin evaluating commands
repl(&mut away, &mut buffer, &mut pos, &mut env);
}
|
