feat(start-file): Add verification to all PowerNukkitX start files

Author: AzaleeX

start.bat

@@ -1,5 +1,32 @@
 @echo off
 
+TITLE PowerNukkitX server software for Minecraft: Bedrock Edition
+
+REM Check if Java is installed
+java -version >nul 2>&1
+IF %ERRORLEVEL% NEQ 0 (
+    echo Java is not installed. Please install Java 21 or higher.
+    echo You can refer to the installation instructions at https://docs-pnx.pages.dev/requirements
+    pause
+    exit 1
+)
+
+REM Check if powernukkitx.jar exists
+IF NOT EXIST "powernukkitx.jar" (
+    echo PowerNukkitX.jar not found
+    echo You can download the file from https://github.com/PowerNukkitX/PowerNukkitX/releases
+    pause
+    exit 1
+)
+
+REM Check if libs directory exists
+IF NOT EXIST "libs" (
+    echo The libs directory was not found. Please ensure the directory is in the current directory.
+    echo You can download the directory from https://github.com/PowerNukkitX/PowerNukkitX/releases
+    pause
+    exit 1
+)
+
 set JAVA_CMD="java"
 set JAR_NAME="powernukkitx.jar"
 
@@ -13,4 +40,4 @@ set JAR_NAME="powernukkitx.jar"
     --add-opens java.base/java.io=ALL-UNNAMED ^
     --add-opens java.base/java.net=ALL-UNNAMED ^
     -cp %JAR_NAME%;./libs/* ^
-    cn.nukkit.Nukkit
+    cn.nukkit.Nukkit

start.cmd

@@ -1,5 +1,32 @@
 @echo off
 
+TITLE PowerNukkitX server software for Minecraft: Bedrock Edition
+
+REM Check if Java is installed
+java -version >nul 2>&1
+IF %ERRORLEVEL% NEQ 0 (
+    echo Java is not installed. Please install Java 21 or higher.
+    echo You can refer to the installation instructions at https://docs-pnx.pages.dev/requirements
+    pause
+    exit 1
+)
+
+REM Check if powernukkitx.jar exists
+IF NOT EXIST "powernukkitx.jar" (
+    echo PowerNukkitX.jar not found
+    echo You can download the file from https://github.com/PowerNukkitX/PowerNukkitX/releases
+    pause
+    exit 1
+)
+
+REM Check if libs directory exists
+IF NOT EXIST "libs" (
+    echo The libs directory was not found
+    echo You can download the directory from https://github.com/PowerNukkitX/PowerNukkitX/releases
+    pause
+    exit 1
+)
+
 set JAVA_CMD="java"
 set JAR_NAME="powernukkitx.jar"
 
@@ -13,4 +40,4 @@ set JAR_NAME="powernukkitx.jar"
     --add-opens java.base/java.io=ALL-UNNAMED ^
     --add-opens java.base/java.net=ALL-UNNAMED ^
     -cp %JAR_NAME%;./libs/* ^
-    cn.nukkit.Nukkit
+    cn.nukkit.Nukkit

start.ps1

@@ -1,3 +1,24 @@
+# Check if Java is installed
+if (-not (Get-Command java -ErrorAction SilentlyContinue)) {
+    Write-Host "Java is not installed. Please install Java 21 or higher."
+    Write-Host "You can refer to the installation instructions at https://docs-pnx.pages.dev/requirements"
+    exit 1
+}
+
+# Check if powernukkitx.jar exists
+if (-not (Test-Path -Path "powernukkitx.jar")) {
+    Write-Host "PowerNukkitX.jar not found"
+    Write-Host "You can download the file from https://github.com/PowerNukkitX/PowerNukkitX/releases"
+    exit 1
+}
+
+# Check if libs directory exists
+if (-not (Test-Path -Path "libs" -PathType Container)) {
+    Write-Host "The libs directory was not found. Please ensure the directory is in the current directory."
+    Write-Host "You can download the directory from https://github.com/PowerNukkitX/PowerNukkitX/releases"
+    exit 1
+}
+
 $JAVA_CMD = "java"
 $JAR_NAME = "powernukkitx.jar"
 
@@ -11,4 +32,4 @@ $JAR_NAME = "powernukkitx.jar"
     --add-opens java.base/java.io=ALL-UNNAMED `
     --add-opens java.base/java.net=ALL-UNNAMED `
     -cp "$JAR_NAME;./libs/*" `
-    cn.nukkit.Nukkit
+    cn.nukkit.Nukkit

start.sh

@@ -1,11 +1,33 @@
 #!/bin/bash
 
-# Construct the full path to the Java executable
+echo "PowerNukkitX server software for Minecraft: Bedrock Edition"
+
+# Check if Java is installed
+if ! java -version &> /dev/null
+then
+    echo "Java is not installed. Please install Java 21 or higher."
+    echo "You can refer to the installation instructions at https://docs-pnx.pages.dev/requirements"
+    exit 1
+fi
+
+# Check if powernukkitx.jar exists
+if [ ! -f "powernukkitx.jar" ]; then
+    echo "PowerNukkitX.jar not found"
+    echo "You can download the file from https://github.com/PowerNukkitX/PowerNukkitX/releases"
+    exit 1
+fi
+
+# Check if libs directory exists
+if [ ! -d "libs" ]; then
+    echo "The libs directory was not found. Please ensure the directory is in the current directory."
+    echo "You can download the directory from https://github.com/PowerNukkitX/PowerNukkitX/releases"
+    exit 1
+fi
+
 JAVA_CMD="java"
 JAR_NAME="powernukkitx.jar"
 
-# Execute the Java command
-"$JAVA_CMD" -Dfile.encoding=UTF-8 \
+$JAVA_CMD -Dfile.encoding=UTF-8 \
     -Djansi.passthrough=true \
     -Dterminal.ansi=true \
     -XX:+UseZGC \
@@ -14,5 +36,5 @@ JAR_NAME="powernukkitx.jar"
     --add-opens java.base/java.lang=ALL-UNNAMED \
     --add-opens java.base/java.io=ALL-UNNAMED \
     --add-opens java.base/java.net=ALL-UNNAMED \
-    -cp "$JAR_NAME:./libs/*" \
-    cn.nukkit.Nukkit
+    -cp $JAR_NAME:./libs/* \
+    cn.nukkit.Nukkit