Ventoy Menu Class Plugin

• What is menu class

Ventoy use grub2's theme which has a class property in the menu. You can refer https://www.gnu.org/software/grub/manual/grub/grub.html for detail.
To be simply, you can define a class for the ISO files and show an icon in the boot menu. For example, you define a menu with class 'ubuntu' and put a ubuntu.png file in iconsdirectory under the theme directory. Then the icon can be shown in the menu as bellows:

• Json Configuration

Recommend to use VentoyPlugson, a GUI ventoy.json configurator. Refer VentoyPlugson
A menu_class array is defined to describe the configuration in /ventoy/ventoy.json. Both image file and directory are supported.
Use key to specify a substring of the image file name and dir to specify the full path of a directory.

{
    "menu_class": [
        {
            "key": "MX-",
            "class": "mx"
        },
        {
            "key": "ubuntu",
            "class": "ubuntu"
        },        
        {
            "key": "CentOS-7-",
            "class": "centos"
        },
        {
            "parent": "/ISO/Linux/Arch",
            "class": "arch"
        },
        {
            "dir": "/ISO/Linux",
            "class": "linux"
        }        
    ]
}

1. The class has higher position with higher priority
2. The match for the key is something like strstr(iso_name, key)
3. If you have huge number of ISO files in USB and define a long menu_class array, it will take a little long time to load Ventoy's boot menu.
4. You need to set item_spacing item_padding item_icon_space and other variables in theme.txt for better display (Grub2 theme tutorial)

• Special Notes

All the submenus under F4 and F5 will inherit the built-in class of their parent menu. For example:
For F5 Tools ---> Check plugin json configuration (ventoy.json) --> Check theme plugin configuration
It has class of debug_theme debug_json and F5tool. So it will show debug_theme.png if exist or debug_json.png if exist or F5tool.png if exist.

• Multi-Mode

Supported. You can set different configurations for different BIOS mode. Please refer Multi-Mode Option for details.

• Directory Level