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|
mod recite;
use ctrlc;
use recite::path::prefresh;
use recite::Poem;
use std::io::{self, Write};
use std::path::Path;
/// Starts the main shell loop
///
/// # Arguments
/// * `paths` - A reference to a vector that holds a list to the shell $PATHs
/// * `prompt` - A string slice indicating the shell's prompt
///
/// # Examples
/// ```
/// fn main() {
/// let path = vec!["/bin"];
/// let path = path.into_iter().map(Path::new).collect();
/// let prompt = "|> ";
/// ...
/// repl(&path, prompt);
/// }
/// ```
fn repl(path: &Vec<&Path>, prompt: &str) {
// Initial path refresh on startup
let mut bins: Vec<String> = prefresh(path);
// Main shell loop
loop {
// Output the prompt
io::stdout().flush().unwrap();
print!("{}", prompt);
io::stdout().flush().unwrap();
// Wait for user input
let mut poetry = String::new();
let bytes = io::stdin()
.read_line(&mut poetry)
.expect("dwvsh: error: unable to evaluate the input string");
// Check if we've reached EOF (i.e. <C-d>)
if bytes == 0 {
println!("");
break;
}
// Trim the input
let poetry = String::from(poetry.trim());
// Skip parsing if there is no poetry
if poetry.is_empty() {
continue;
}
// Parse a poem
let poem = Poem::read(poetry);
match poem {
Some(poem) => {
poem.recite(path, &mut bins);
}
None => {}
}
}
}
/// Shell entry
///
/// Shell setup and entry
fn main() {
// Define paths
// TODO: Hardcoded path should only be the fallback
let path = vec![
"/bin",
"/sbin",
"/usr/bin",
"/usr/sbin",
"/usr/local/bin",
"/usr/local/sbin",
];
let path = path.into_iter().map(Path::new).collect();
// Set the prompt
let prompt = "|> ";
// Handle signals
ctrlc::set_handler(move || {
print!("\n{}", prompt);
io::stdout().flush().unwrap();
})
.expect("dwvsh: signals: unable to set sigint handler");
// Begin evaluating commands
repl(&path, prompt);
}
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