104 lines
2.8 KiB
Rust
104 lines
2.8 KiB
Rust
use rhai::{Engine, EvalAltResult, Position};
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use std::{env, fs::File, io::Read, path::Path, process::exit};
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fn eprint_error(input: &str, mut err: EvalAltResult) {
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fn eprint_line(lines: &[&str], pos: Position, err_msg: &str) {
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let line = pos.line().unwrap();
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let line_no = format!("{line}: ");
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eprintln!("{line_no}{}", lines[line - 1]);
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eprintln!(
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"{:>1$} {err_msg}",
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"^",
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line_no.len() + pos.position().unwrap(),
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);
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eprintln!();
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}
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let lines: Vec<_> = input.split('\n').collect();
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// Print error
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let pos = err.take_position();
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if pos.is_none() {
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// No position
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eprintln!("{err}");
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} else {
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// Specific position
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eprint_line(&lines, pos, &err.to_string())
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}
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}
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fn main() {
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let mut contents = String::new();
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for filename in env::args().skip(1) {
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let filename = match Path::new(&filename).canonicalize() {
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Err(err) => {
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eprintln!("Error script file path: {filename}\n{err}");
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exit(1);
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}
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Ok(f) => match f.strip_prefix(std::env::current_dir().unwrap().canonicalize().unwrap())
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{
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Ok(f) => f.into(),
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_ => f,
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},
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};
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// Initialize scripting engine
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let mut engine = Engine::new();
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#[cfg(not(feature = "no_optimize"))]
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engine.set_optimization_level(rhai::OptimizationLevel::Simple);
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let mut f = match File::open(&filename) {
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Err(err) => {
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eprintln!(
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"Error reading script file: {}\n{}",
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filename.to_string_lossy(),
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err
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);
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exit(1);
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}
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Ok(f) => f,
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};
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contents.clear();
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if let Err(err) = f.read_to_string(&mut contents) {
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eprintln!(
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"Error reading script file: {}\n{}",
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filename.to_string_lossy(),
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err
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);
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exit(1);
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}
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let contents = if contents.starts_with("#!") {
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// Skip shebang
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&contents[contents.find('\n').unwrap_or(0)..]
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} else {
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&contents[..]
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};
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if let Err(err) = engine
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.compile(contents)
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.map_err(|err| err.into())
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.and_then(|mut ast| {
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ast.set_source(filename.to_string_lossy().to_string());
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engine.run_ast(&ast)
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})
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{
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let filename = filename.to_string_lossy();
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eprintln!("{:=<1$}", "", filename.len());
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eprintln!("{filename}");
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eprintln!("{:=<1$}", "", filename.len());
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eprintln!();
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eprint_error(contents, *err);
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}
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}
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}
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