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Computers in vanilla Minecraft | TotalOS SDK
There is a newer version: 0.10.2b
/*
    Plugin for computers in vanilla minecraft!
    Copyright (C) 2022  JNNGL

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see .
 */

package com.jnngl.system;

import com.jnngl.totalcomputers.system.TotalOS;
import com.jnngl.totalcomputers.system.desktop.ApplicationHandler;
import com.jnngl.totalcomputers.system.desktop.ConsoleApplication;

import java.io.*;
import java.nio.charset.StandardCharsets;

public class Terminal extends ConsoleApplication {

    private File path;

    public static void main(String[] args) {
        ApplicationHandler.open(Terminal.class, args[0]);
    }

    public Terminal(TotalOS os, String path) {
        super(os, "Terminal", os.screenWidth/3*2, os.screenHeight/3*2, path);
    }

    @Override
    protected void onStart() {
        path = new File(os.fs.root()+"/usr");
        putString(os.name).putString("$").putString(path.getPath().replace(os.fs.root(), "")).putString(": ");
    }

    @Override
    protected boolean onClose() {
        return true;
    }

    private void processCommand(String name, String[] args) {
        switch (name) {
            case "cd": {
                File probe = new File(path.getPath()+"/"+args[0]);
                if(args[0].startsWith("/")) probe = new File(os.fs.root()+args[0]);
                if(!probe.exists()) {
                    putString("Directory '").putString(args[0]).putString("' does not exists.\n");
                    break;
                }
                if(!probe.isDirectory()) {
                    putString("'").putString(args[0]).putString("' is a file.\n");
                    break;
                }
                path = probe;
                break;
            }

//            case "ls": {
//                boolean A = false;
//                boolean a = false;
//
//                String directory = path.getPath();
//
//                for(String arg : args) {
//                    if(arg.equals("")) continue;
//                    if(arg.startsWith("-") && !arg.startsWith("--")) {
//                        if(arg.contains("a")) {
//                            a = true;
//                        }
//                        if(arg.contains("A")) {
//                            a = true;
//                            A = true;
//                        }
//                    } else if(arg.startsWith("--")) {
//
//                    } else {
//                        if(arg.startsWith("/")) directory = os.fs.root()+arg;
//                        else directory = path.getPath()+"/"+arg;
//                    }
//                }
//
//                boolean finalA = a;
//                File[] files = new File(directory).listFiles((dir, name1) -> {
//                    if(name1.startsWith(".")) {
//                        if(!finalA) return false;
//                    }
//
//                    return true;
//                });
//
//                if(files == null) {
//                    putString("Failed to access directory '").putString(directory).putString("'.\n");
//                    break;
//                }
//                if(a && !A) putString(".\n..");
//                for(File file : files) {
//                    putString(file.getName()).putString("\n");
//                }
//
//                break;
//            }

            case "open": {
                if(args.length > 0) {
                    String filename = args[0];
                    File file =new File(path, filename);
                    if(!file.exists()) {
                        putString("`"+filename+"'").putString(" does not exists.");
                        break;
                    }
                    os.fs.executeFile(file);
                } else putString("open ");
                break;
            }

            default: {
                if(!os.fs.launchFromApplication("/sys/bin/"+name)
                    && !os.fs.launchFromApplication("/sys/bin/"+name+".app")) {
                    if(!os.fs.launchFromApplication("/usr/Applications"+name)
                        && !os.fs.launchFromApplication("/sys/bin/"+name+".app")) {
                        if(!os.fs.launchFromApplication(path.getPath()+"/"+name)
                            && !os.fs.launchFromApplication("/sys/bin/"+name+".app")) {
                            String[] cmd;
                            if(System.getProperty("os.name").toLowerCase().startsWith("windows")) {
                                cmd = new String[args.length+3];
                                cmd[0] = "cmd.exe";
                                cmd[1] = "/c";
                                cmd[2] = name;
                                System.arraycopy(args, 0, cmd, 3, args.length);
                            } else {
                                cmd = new String[args.length+1];
                                cmd[0] = name;
                                System.arraycopy(args, 0, cmd, 1, args.length);
                            }
                            ProcessBuilder pb = new ProcessBuilder(cmd);
                            pb.directory(path);
                            try {
                                Process p = pb.start();

                                class OutputRedirect extends Thread {
                                    InputStream is;
                                    ConsoleOutput out;

                                    OutputRedirect(InputStream is, ConsoleOutput out) {
                                        this.is = is;
                                        this.out = out;
                                    }

                                    public void run() {
                                        try {
                                            InputStreamReader isr = new InputStreamReader(is);
                                            BufferedReader br = new BufferedReader(isr);
                                            String line;
                                            while((line = br.readLine()) != null) {
                                                out.write(line+"\n");
                                                renderCanvas();
                                            }
                                        } catch (IOException ioe) {
                                            ioe.printStackTrace();
                                        }
                                    }
                                }
                                OutputRedirect out = new OutputRedirect(p.getInputStream(), stdout);
                                OutputRedirect err = new OutputRedirect(p.getErrorStream(), stderr);
                                out.start();
                                err.start();
                                try {
                                    err.join();
                                    out.join();
                                } catch (InterruptedException e) {
                                    putString(e.getLocalizedMessage()+"\n");
                                }
                                putString("\n");
                            } catch (IOException e) {
                                putString(e.getLocalizedMessage()+"\n");
                            }
                        }
                    }
                }
                break;
            }
        }
    }

    @Override
    public void update() {
        if(hasNext()) {
            String cmd = next();
            String[] parts = cmd.split(" ");
            String[] args = new String[parts.length-1];
            System.arraycopy(parts, 1, args, 0, args.length);
            processCommand(parts[0], args);
            putString(os.name).putString("$").putString(path.getPath().replace(os.fs.root(), "")).putString(": ").renderCanvas();
        }
    }
}