yom 0.1.7

A modern, easy to install competitor to the dash shell, built solely to execute files.
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// ██    ██  ██████  ███    ███ 
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#[cfg(not(unix))]
compile_error!("YOM is available on UNIX-like systems only.");
// Makes sure YOM dosn't compile on windows

// ██╗███╗   ███╗██████╗  ██████╗ ██████╗ ████████╗███████╗
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// ██║██║╚██╔╝██║██╔═══╝ ██║   ██║██╔══██╗   ██║   ╚════██║
// ██║██║ ╚═╝ ██║██║     ╚██████╔╝██║  ██║   ██║   ███████║
// ╚═╝╚═╝     ╚═╝╚═╝      ╚═════╝ ╚═╝  ╚═╝   ╚═╝   ╚══════╝

use std::io;
use std::fs::File;
use std::io::{BufRead, BufReader};
mod builtins; // adds all the builtins as a module
mod externals; // adds all the functions for externals as a module
use std::process::exit;

fn main() {
    let mut args = std::env::args_os();
    args.next();
    
    let path = match args.next() {
        Some(p) => p,
        None => return,
    };
    let f = File::open(&path).expect("Expected file");
    
    let mut reader = BufReader::new(f);

    let mut line = String::new();
    let stdout = io::stdout();
    let mut lock = stdout.lock();
    while reader.read_line(&mut line).unwrap() > 0 {

    // ███████╗██╗   ██╗ █████╗ ██╗     
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    // ██╔══╝  ╚██╗ ██╔╝██╔══██║██║     
    // ███████╗ ╚████╔╝ ██║  ██║███████╗
    // ╚══════╝  ╚═══╝  ╚═╝  ╚═╝╚══════╝

        if line.starts_with("#") || line == "\n" || line == "" {
            // ignores line
            line.clear();
            continue;

        } else if line.starts_with("echo ") {
            // echos the string back to you
            let str = line.strip_prefix("echo ").unwrap(); // removes the string "echo " from the start
            let str = str.strip_suffix("\n").unwrap_or(str); // removes the newline from the end and shadows the old str
            if str.starts_with('"') && str.ends_with('"') {
                // does a bit of trimming for quotes
                let str = str.strip_prefix('"').unwrap();
                let str = str.strip_suffix('"').unwrap();
                builtins::echo::echo(str, &mut lock); // calls echo (handing the stdout lock over)
            } else {
                builtins::echo::echo(str, &mut lock); // calls echo (handing the stdout lock over)
            }

        } else if line == "pwd\n" {
            // echos the current working directory to stdout
            let _ = builtins::pwd::pwd(&mut lock); // calls pwd (handing stdout lock over)

        } else if line.starts_with("cd ") {
            let dir = line.strip_prefix("cd ").unwrap(); // trims the "cd " string from the dir
            let dir = dir.strip_suffix("\n").unwrap_or(dir); // trims the newline at the end of cd (shadowing the variable)
            if dir.starts_with('"') && dir.ends_with('"') {
                let dir = dir.strip_prefix('"').unwrap(); // trims quotes from start shadowing old dir
                let dir = dir.strip_suffix('"').unwrap(); // trims quotes from start shadowing old dir
                let _ = builtins::cd::cd(dir); // calls cd 
            } else {
                let _ = builtins::cd::cd(dir); // calls cd 
            }

        } else if line == "exit\n" {
            builtins::exit::exit(0); // calls exit on exit code 0

        } else if line.starts_with("exit ") {
            let code: i32 = line.trim_start_matches("exit ").trim_end_matches("\n").parse().unwrap(); // trims "exit " and the newline, then parses it into i32
            builtins::exit::exit(code); // executes exit on exit code specified in the file

        } else if line.starts_with("/") {
            externals::entry::waitfor(&line); // waits for the program to finish

        } else if line.starts_with("& ") {
            let _ = externals::entry::background(&line); // backgrounds the program (ignoring the resulting zombie)

        } else if line.starts_with("exec ") {
            externals::entry::exec(&line); // changes yom into said program

        } else if line.starts_with("read") {
            let prompt = line.strip_prefix("read ").unwrap(); // removes the string "read " from the prompt
            let prompt = prompt.strip_suffix("\n").unwrap_or(prompt); // removes the newline from the prompt, shadowing the old prompt 
            if prompt.starts_with('"') && prompt.ends_with('"') {
                let prompt = prompt.strip_prefix('"').unwrap(); // trims quotes
                let prompt = prompt.strip_suffix('"').unwrap(); // trims quotes while shadowing old prompt
                let _ = builtins::read::read(prompt, &mut lock); // executes read
            } else {
                let _ = builtins::read::read(prompt, &mut lock); // executes read
            }

        } else {
            exit(1);
        }

        line.clear();
    }
    exit(0);
}