Modularized the script and added lwjgl detection instead of using hardcoded value

Author: FlyingEwok

.gitignore

@@ -10,4 +10,6 @@
 !accounts.json
 !.github/
 !.github/**
-!token.enc
+!token.enc
+!modules/
+!modules/**

install-minecraft-splitscreen.sh

@@ -0,0 +1,244 @@
+#!/bin/bash
+# =============================================================================
+# Minecraft Splitscreen Steam Deck Installer - Desktop Launcher Module
+# =============================================================================
+# 
+# This module handles the creation of native desktop launchers and application
+# menu integration for the Minecraft Splitscreen launcher. Provides seamless
+# integration with Linux desktop environments.
+#
+# Functions provided:
+# - create_desktop_launcher: Generate .desktop file for system integration
+#
+# =============================================================================
+
+# create_desktop_launcher: Generate .desktop file for system integration
+#
+# DESKTOP LAUNCHER BENEFITS:
+# - Native desktop environment integration (GNOME, KDE, XFCE, etc.)
+# - Appears in application menus and search results
+# - Desktop shortcut for quick access
+# - Proper icon and metadata for professional appearance
+# - Follows freedesktop.org Desktop Entry Specification
+# - Works with all Linux desktop environments
+#
+# ICON HIERARCHY:
+# 1. SteamGridDB custom icon (downloaded, professional appearance)
+# 2. PollyMC instance icon (if PollyMC setup successful)
+# 3. PrismLauncher instance icon (fallback)
+# 4. System generic icon (ultimate fallback)
+#
+# DESKTOP FILE LOCATIONS:
+# - Desktop shortcut: ~/Desktop/MinecraftSplitscreen.desktop
+# - System integration: ~/.local/share/applications/MinecraftSplitscreen.desktop
+create_desktop_launcher() {
+    print_header "🖥️ DESKTOP LAUNCHER SETUP"
+    
+    # =============================================================================
+    # DESKTOP LAUNCHER USER PROMPT
+    # =============================================================================
+    
+    # USER PREFERENCE GATHERING: Ask if they want desktop integration
+    # Desktop launchers provide convenient access without terminal or Steam
+    # Particularly useful for users who don't use Steam or prefer native desktop integration
+    print_info "Desktop launcher creates a native shortcut for your desktop environment."
+    print_info "Benefits: Desktop shortcut, application menu entry, search integration"
+    echo ""
+    read -p "Do you want to create a desktop launcher for Minecraft Splitscreen? [y/N]: " create_desktop
+    if [[ "$create_desktop" =~ ^[Yy]$ ]]; then
+        
+        # =============================================================================
+        # DESKTOP FILE CONFIGURATION AND PATHS
+        # =============================================================================
+        
+        # DESKTOP FILE SETUP: Define paths and filenames following Linux standards
+        # .desktop files follow the freedesktop.org Desktop Entry Specification
+        # Standard locations ensure compatibility across all Linux desktop environments
+        local desktop_file_name="MinecraftSplitscreen.desktop"
+        local desktop_file_path="$HOME/Desktop/$desktop_file_name"  # User desktop shortcut
+        local app_dir="$HOME/.local/share/applications"              # System integration directory
+        
+        # APPLICATIONS DIRECTORY CREATION: Ensure the applications directory exists
+        # This directory is where desktop environments look for user-installed applications
+        mkdir -p "$app_dir"
+        print_info "Desktop file will be created at: $desktop_file_path"
+        print_info "Application menu entry will be registered in: $app_dir"
+        
+        # =============================================================================
+        # ICON ACQUISITION AND CONFIGURATION
+        # =============================================================================
+        
+        # CUSTOM ICON DOWNLOAD: Get professional SteamGridDB icon for consistent branding
+        # This provides the same visual identity as the Steam integration
+        # SteamGridDB provides high-quality gaming artwork used by many Steam applications
+        local icon_dir="$PWD/minecraft-splitscreen-icons"
+        local icon_path="$icon_dir/minecraft-splitscreen-steamgriddb.ico"
+        local icon_url="https://cdn2.steamgriddb.com/icon/add7a048049671970976f3e18f21ade3.ico"
+        
+        print_progress "Configuring desktop launcher icon..."
+        mkdir -p "$icon_dir"  # Ensure icon storage directory exists
+        
+        # ICON DOWNLOAD: Fetch SteamGridDB icon if not already present
+        # This provides a professional-looking icon that matches Steam integration
+        if [[ ! -f "$icon_path" ]]; then
+            print_progress "Downloading custom icon from SteamGridDB..."
+            if wget -O "$icon_path" "$icon_url" >/dev/null 2>&1; then
+                print_success "✅ Custom icon downloaded successfully"
+            else
+                print_warning "⚠️  Custom icon download failed - will use fallback icons"
+            fi
+        else
+            print_info "   → Custom icon already present"
+        fi
+        
+        # =============================================================================
+        # ICON SELECTION WITH FALLBACK HIERARCHY
+        # =============================================================================
+        
+        # ICON SELECTION: Determine the best available icon with intelligent fallbacks
+        # Priority system ensures we always have a functional icon, preferring custom over generic
+        local icon_desktop
+        if [[ -f "$icon_path" ]]; then
+            icon_desktop="$icon_path"  # Best: Custom SteamGridDB icon
+            print_info "   → Using custom SteamGridDB icon for consistent branding"
+        elif [[ "$USE_POLLYMC" == true ]] && [[ -f "$HOME/.local/share/PollyMC/instances/latestUpdate-1/icon.png" ]]; then
+            icon_desktop="$HOME/.local/share/PollyMC/instances/latestUpdate-1/icon.png"  # Good: PollyMC instance icon
+            print_info "   → Using PollyMC instance icon"
+        elif [[ -f "$TARGET_DIR/instances/latestUpdate-1/icon.png" ]]; then
+            icon_desktop="$TARGET_DIR/instances/latestUpdate-1/icon.png"  # Acceptable: PrismLauncher instance icon
+            print_info "   → Using PrismLauncher instance icon"
+        else
+            icon_desktop="application-x-executable"  # Fallback: Generic system executable icon
+            print_info "   → Using system default executable icon"
+        fi
+        
+        # =============================================================================
+        # LAUNCHER SCRIPT PATH CONFIGURATION
+        # =============================================================================
+        
+        # LAUNCHER SCRIPT PATH DETECTION: Set correct executable path based on active launcher
+        # The desktop file needs to point to the appropriate launcher script
+        # Different paths and descriptions for PollyMC vs PrismLauncher configurations
+        local launcher_script_path
+        local launcher_comment
+        if [[ "$USE_POLLYMC" == true ]]; then
+            launcher_script_path="$HOME/.local/share/PollyMC/minecraftSplitscreen.sh"
+            launcher_comment="Launch Minecraft splitscreen with PollyMC (optimized for offline gameplay)"
+            print_info "   → Desktop launcher configured for PollyMC"
+        else
+            launcher_script_path="$TARGET_DIR/minecraftSplitscreen.sh"
+            launcher_comment="Launch Minecraft splitscreen with PrismLauncher"
+            print_info "   → Desktop launcher configured for PrismLauncher"
+        fi
+        
+        # =============================================================================
+        # DESKTOP ENTRY FILE GENERATION
+        # =============================================================================
+        
+        # DESKTOP FILE CREATION: Generate .desktop file following freedesktop.org specification
+        # This creates a proper desktop entry that integrates with all Linux desktop environments
+        # The file contains metadata, execution parameters, and display information
+        print_progress "Generating desktop entry file..."
+        
+        # Desktop Entry Specification fields:
+        # - Type=Application: Indicates this is an application launcher
+        # - Name: Display name in menus and desktop
+        # - Comment: Tooltip/description text
+        # - Exec: Command to execute when launched
+        # - Icon: Icon file path or theme icon name
+        # - Terminal: Whether to run in terminal (false for GUI applications)
+        # - Categories: Menu categories for proper organization
+        
+        cat > "$desktop_file_path" <<EOF
+[Desktop Entry]
+Type=Application
+Name=Minecraft Splitscreen
+Comment=$launcher_comment
+Exec=$launcher_script_path
+Icon=$icon_desktop
+Terminal=false
+Categories=Game;
+EOF
+        
+        print_success "✅ Desktop entry file created successfully"
+        
+        # =============================================================================
+        # DESKTOP FILE PERMISSIONS AND VALIDATION
+        # =============================================================================
+        
+        # DESKTOP FILE PERMISSIONS: Make the .desktop file executable
+        # Many desktop environments require .desktop files to be executable
+        # This ensures the launcher appears and functions properly across all DEs
+        chmod +x "$desktop_file_path"
+        print_info "   → Desktop file permissions set to executable"
+        
+        # DESKTOP FILE VALIDATION: Basic syntax check
+        # Verify the generated .desktop file has required fields
+        if [[ -f "$desktop_file_path" ]] && grep -q "Type=Application" "$desktop_file_path"; then
+            print_success "✅ Desktop file validation passed"
+        else
+            print_warning "⚠️  Desktop file validation failed - file may not work properly"
+        fi
+        
+        # =============================================================================
+        # SYSTEM INTEGRATION AND REGISTRATION
+        # =============================================================================
+        
+        # SYSTEM INTEGRATION: Copy to applications directory for system-wide access
+        # This makes the launcher appear in application menus, search results, and launchers
+        # The ~/.local/share/applications directory is the standard location for user applications
+        print_progress "Registering application with desktop environment..."
+        
+        if cp "$desktop_file_path" "$app_dir/$desktop_file_name"; then
+            print_success "✅ Application registered in system applications directory"
+        else
+            print_warning "⚠️  Failed to register application system-wide"
+        fi
+        
+        # =============================================================================
+        # DESKTOP DATABASE UPDATE
+        # =============================================================================
+        
+        # DATABASE UPDATE: Refresh desktop database to register new application immediately
+        # This ensures the launcher appears in menus without requiring logout/reboot
+        # The update-desktop-database command updates the application cache
+        print_progress "Updating desktop application database..."
+        
+        if command -v update-desktop-database >/dev/null 2>&1; then
+            update-desktop-database "$app_dir" 2>/dev/null || true
+            print_success "✅ Desktop database updated - launcher available immediately"
+        else
+            print_info "   → Desktop database update tool not found (launcher may need logout to appear)"
+        fi
+        
+        # =============================================================================
+        # DESKTOP LAUNCHER COMPLETION SUMMARY
+        # =============================================================================
+        
+        print_success "🖥️ Desktop launcher setup complete!"
+        print_info ""
+        print_info "📋 Desktop Integration Summary:"
+        print_info "   → Desktop shortcut: $desktop_file_path"
+        print_info "   → Application menu: $app_dir/$desktop_file_name"
+        print_info "   → Icon: $(basename "$icon_desktop")"
+        print_info "   → Target launcher: $(basename "$launcher_script_path")"
+        print_info ""
+        print_info "🚀 Access Methods:"
+        print_info "   → Double-click desktop shortcut"
+        print_info "   → Search for 'Minecraft Splitscreen' in application menu"
+        print_info "   → Launch from desktop environment's application launcher"
+    else
+        # =============================================================================
+        # DESKTOP LAUNCHER DECLINED
+        # =============================================================================
+        
+        print_info "⏭️  Skipping desktop launcher creation"
+        print_info "   → You can still launch via Steam (if configured) or manually run the script"
+        print_info "   → Manual launch command:"
+        if [[ "$USE_POLLYMC" == true ]]; then
+            print_info "     $HOME/.local/share/PollyMC/minecraftSplitscreen.sh"
+        else
+            print_info "     $TARGET_DIR/minecraftSplitscreen.sh"
+        fi
+    fi
+}