bashkit 0.1.19

Awesomely fast virtual sandbox with bash and file system
Documentation 
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//! yes builtin - repeatedly output a line

use async_trait::async_trait;

use super::{Builtin, Context};
use crate::error::Result;
use crate::interpreter::ExecResult;

/// The yes builtin - output a string repeatedly.
///
/// Usage: yes [STRING]
///
/// Repeatedly outputs STRING (default: "y") followed by newline.
/// In bashkit, output is limited to avoid infinite loops.
pub struct Yes;

/// Maximum number of lines to output (safety limit)
const MAX_LINES: usize = 10_000;

#[async_trait]
impl Builtin for Yes {
    async fn execute(&self, ctx: Context<'_>) -> Result<ExecResult> {
        if let Some(r) = super::check_help_version(
            ctx.args,
            "Usage: yes [STRING]\nRepeatedly output a line with STRING, or 'y'.\n\n  --help\tdisplay this help and exit\n  --version\toutput version information and exit\n",
            Some("yes (bashkit) 0.1"),
        ) {
            return Ok(r);
        }
        let text = if ctx.args.is_empty() {
            "y".to_string()
        } else {
            ctx.args.join(" ")
        };

        let mut output = String::new();
        for _ in 0..MAX_LINES {
            output.push_str(&text);
            output.push('\n');
        }

        Ok(ExecResult::ok(output))
    }
}