README.md

Console.java

Snippet to easily invoke terminal escapes. Follow the code down here #Console.java

Install JNA

1. In IntelliJ, go to File -> Project Structure`
2. Click on Project Settings -> Libraries
3. Press the + button -> From Maven...
4. Type the following libraries and add them.
   • net.java.dev.jna:jna-platform:5.4.0
   • net.java.dev.jna:jna:5.4.0

How to Use

1. Create a new class, name it Console.java
2. Paste the code down below
3. Type Console.viewColors(); in any line to see if it works.
4. Run your code in IntelliJ or press Ctrl + F5.
5. After running, copy the first line you see in the console.
6. Open cmd and paste the code there. It should look similar to this.

C:\Users\Kao> cd C:\Users\Kao\IdeaProjects\kt\Week 7
C:\Users\Kao\IdeaProjects\kt\Week 7> "C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\jbr\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\lib\idea_rt.jar=55445:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Users\Kao\IdeaProjects\kt\Week 7\out\production\Week 7;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\plugins\Kotlin\kotlinc\lib\kotlin-stdlib.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\plugins\Kotlin\kotlinc\lib\kotlin-reflect.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\plugins\Kotlin\kotlinc\lib\kotlin-test.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\plugins\Kotlin\kotlinc\lib\kotlin-stdlib-jdk7.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2\plugins\Kotlin\kotlinc\lib\kotlin-stdlib-jdk8.jar;C:\Users\Kao\.m2\repository\net\java\dev\jna\jna-platform\5.4.0\jna-platform-5.4.0.jar;C:\Users\Kao\.m2\repository\net\java\dev\jna\jna\5.4.0\jna-5.4.0.jar" com.hizamakura.kao.ScrabbleKt

gotoXY

Jumps the cursor to the x and y position.

Console.gotoXY(5, 5);

cls

Clears the entire screen.

Console.cls();

home

Moves the cursor at the top left.

Console.home();

eos

Clears everything starting from the cursor.

Console.eos();

eol

Clears text starting from cursor to the end of line.

Console.eol();

color

Sets the color of the text according to the number.

/*
    0 = Black        8 = Gray
    1 = Blue         9 = Light Blue
    2 = Green       10 = Light Green
    3 = Aqua        11 = Light Aqua
    4 = Red         12 = Light Red
    5 = Purple      13 = Light Purple
    6 = Yellow      14 = Light Yellow
    7 = White       15 = Bright White
*/
Console.color(3);

Console.java

import com.sun.jna.*;
import com.sun.jna.platform.win32.WinDef.*;
import com.sun.jna.platform.win32.WinNT.HANDLE;

public class Console {
    private static boolean VT_ENABLED = false;
    private static String ESC = "\u001B[";

    private static void vt100() {
        if (VT_ENABLED) return;
        if (System.getProperty("os.name").startsWith("Windows")) {
            // Set output mode to handle virtual terminal sequences
            Function GetStdHandleFunc = Function.getFunction("kernel32", "GetStdHandle");
            DWORD STD_OUTPUT_HANDLE = new DWORD(-11);
            HANDLE hOut = (HANDLE) GetStdHandleFunc.invoke(HANDLE.class, new Object[]{STD_OUTPUT_HANDLE});

            DWORDByReference p_dwMode = new DWORDByReference(new DWORD(0));
            Function GetConsoleModeFunc = Function.getFunction("kernel32", "GetConsoleMode");
            GetConsoleModeFunc.invoke(BOOL.class, new Object[]{hOut, p_dwMode});

            DWORD dwMode = p_dwMode.getValue();
            int ENABLE_VIRTUAL_TERMINAL_PROCESSING = 4;
            dwMode.setValue(dwMode.intValue() | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
            Function SetConsoleModeFunc = Function.getFunction("kernel32", "SetConsoleMode");
            SetConsoleModeFunc.invoke(BOOL.class, new Object[]{hOut, dwMode});
            VT_ENABLED = true;
        }
    }

    public static void cls() {
        home();
        eos();
    }

    public static void gotoXY(int x, int y) {
        vt100();
        System.out.print(ESC + y + ";" + x + "H");
    }

    public static void home() {
        vt100();
        System.out.print(ESC + "H");
    }

    public static void eos() {
        vt100();
        System.out.print(ESC + "J");
    }

    public static void eol() {
        vt100();
        System.out.print(ESC + "K");
    }

    public static void color(int color) {
        Function GetStdHandleFunc = Function.getFunction("kernel32", "GetStdHandle");
        DWORD STD_OUTPUT_HANDLE = new DWORD(-11);
        HANDLE hOut = (HANDLE) GetStdHandleFunc.invoke(HANDLE.class, new Object[]{STD_OUTPUT_HANDLE});

        DWORD COLOR = new DWORD(color);
        Function SetConsoleTextAttribute = Function.getFunction("kernel32", "SetConsoleTextAttribute");
        SetConsoleTextAttribute.invoke(BOOL.class, new Object[]{hOut, COLOR});
    }

    public static void viewColors() {
        for (int i = 0; i < 16 * 16; i++) {
            color(i);
            var output = i + " = " + getBackground(i) + " BG & " + getForeground(i) + " Text";
            System.out.println(output);
        }
    }

    private static String getForeground(int i) {
        return getColor(i % 15);
    }

    private static String getBackground(int i) {
        return getColor(i / 15);
    }

    private static String getColor(int i) {
        switch (i) {
            case 0: return "Black";
            case 1: return "Blue";
            case 2: return "Green";
            case 3: return "Aqua";
            case 4: return "Red";
            case 5: return "Purple";
            case 6: return "Yellow";
            case 7: return "White";
            case 8: return "Gray";
            case 9: return "Light Blue";
            case 10: return "Light Green";
            case 11: return "Light Aqua";
            case 12: return "Light Red";
            case 13: return "Light Purple";
            case 14: return "Light Yellow";
            case 15: return "Bright White";
            default: return "";
        }
    }
}