52 lines
1 KiB
Rust
52 lines
1 KiB
Rust
use clap::Parser;
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use std::fs::File;
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use std::io::{self, BufRead, Write};
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#[derive(Parser, Debug)]
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#[command(version, about, long_about = None)]
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struct Args {
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/// Script to run
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#[arg(short, long)]
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script: Option<String>,
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}
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fn run(lines: io::Lines<io::BufReader<File>>) -> () {
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for line in lines {
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println!("Line: {}", line.unwrap());
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}
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}
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fn run_file(script: String) -> Result<(), io::Error> {
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let file = File::open(script)?;
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run(io::BufReader::new(file).lines());
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Ok(())
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}
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fn run_prompt() -> Result<(), io::Error> {
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loop {
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print!("> ");
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io::stdout().flush()?;
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let mut buffer = String::new();
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io::stdin().read_line(&mut buffer)?;
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if buffer.len() == 0 {
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break;
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}
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println!("input: '{}', {}", buffer, buffer.len());
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}
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Ok(())
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let args = Args::parse();
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if let Some(script) = args.script {
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run_file(script)?;
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} else {
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run_prompt()?;
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}
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Ok(())
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}
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