rush-sh 0.8.0

A POSIX sh-compatible shell written in Rust
Documentation 
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use std::io::Write;

use crate::parser::ShellCommand;
use crate::state::ShellState;

fn print_dir_stack(shell_state: &ShellState, writer: &mut dyn Write) {
    // Get current directory
    if let Ok(current) = std::env::current_dir() {
        let current_str = current.to_string_lossy().to_string();
        // Print current directory first
        let _ = write!(writer, "{}", current_str);
        // Then print stack in reverse order (top of stack first)
        for dir in shell_state.dir_stack.iter().rev() {
            let _ = write!(writer, " {}", dir);
        }
        let _ = writeln!(writer);
    }
}

pub struct DirsBuiltin;

impl super::Builtin for DirsBuiltin {
    fn name(&self) -> &'static str {
        "dirs"
    }

    fn names(&self) -> Vec<&'static str> {
        vec![self.name()]
    }

    fn description(&self) -> &'static str {
        "Display directory stack"
    }

    fn run(
        &self,
        _cmd: &ShellCommand,
        shell_state: &mut ShellState,
        output_writer: &mut dyn Write,
    ) -> i32 {
        print_dir_stack(shell_state, output_writer);
        0
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::builtins::Builtin;

    #[test]
    fn test_execute_builtin_dirs() {
        let cmd = ShellCommand {
            args: vec!["dirs".to_string()],
            redirections: Vec::new(),
            compound: None,
        };
        let mut shell_state = crate::state::ShellState::new();
        let builtin = DirsBuiltin;
        let mut output = Vec::new();
        let exit_code = builtin.run(&cmd, &mut shell_state, &mut output);
        assert_eq!(exit_code, 0);
    }
}