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|
use std::{
fs,
path::{Path, PathBuf},
};
use clap::Parser;
use rustyline::{error::ReadlineError, Editor};
#[derive(Parser)]
struct Args {
/// Path to a script to evaluate
script: Option<PathBuf>,
#[clap(flatten)]
eval_options: tvix_eval::Options,
}
fn main() {
let args = Args::parse();
if let Some(file) = &args.script {
run_file(file, args.eval_options)
} else {
run_prompt(args.eval_options)
}
}
fn run_file(file: &Path, eval_options: tvix_eval::Options) {
let contents = fs::read_to_string(file).expect("failed to read the input file");
let path = Path::new(file).to_owned();
match tvix_eval::interpret(&contents, Some(path), eval_options) {
Ok(result) => println!("=> {} :: {}", result, result.type_of()),
Err(err) => eprintln!("{}", err),
}
}
fn state_dir() -> Option<PathBuf> {
let mut path = dirs::data_dir();
if let Some(p) = path.as_mut() {
p.push("tvix")
}
path
}
fn run_prompt(eval_options: tvix_eval::Options) {
let mut rl = Editor::<()>::new().expect("should be able to launch rustyline");
let history_path = match state_dir() {
// Attempt to set up these paths, but do not hard fail if it
// doesn't work.
Some(mut path) => {
let _ = std::fs::create_dir_all(&path);
path.push("history.txt");
let _ = rl.load_history(&path);
Some(path)
}
None => None,
};
loop {
let readline = rl.readline("tvix-repl> ");
match readline {
Ok(line) => {
if line.is_empty() {
continue;
}
rl.add_history_entry(&line);
match tvix_eval::interpret(&line, None, eval_options) {
Ok(result) => {
println!("=> {} :: {}", result, result.type_of());
}
Err(err) => println!("{}", err),
}
}
Err(ReadlineError::Interrupted) | Err(ReadlineError::Eof) => break,
Err(err) => {
eprintln!("error: {}", err);
break;
}
}
}
if let Some(path) = history_path {
rl.save_history(&path).unwrap();
}
}
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