Differentiate between systems with and without dedicated GPUs

[Schaex]

Hello there. My PC has an integrated GPU and a dedicated GPU. My laptop only has an integrated GPU.

Is there any way to write a single config file for both systems that only displays the dedicated GPU if there is any and only falls back to displaying the integrated GPU if there is no dedicated GPU?

In other words: I want to display only my dedicated GPU on my PC, but not the integrated GPU, and display my integrated GPU on my laptop.

If there is no way to achieve this I will just write a second config file.

[CarterLi]

Should have been

{
    "modules": [
        {
            "type": "gpu",
            "hideType": "integrated"
        },
        {
            "condition": {
                "succeeded": false // When no discrete GPU is found, the last run should return an error, then this module should run.
            },
            "type": "gpu"
        }
    ]
}

However, as I said in reddit, due to a bug, { "type": "gpu", "hideType": "integrated" } doesn't return an error so the second module entry never runs.

This has been fixed in e24e3b6

[Schaex]

Thank you! In version 2.64.2, condition.succeeded works as expected. I reckon the package on CachyOS will be updated to this version soon.

[CarterLi]

There is another approach if you use the newest version v2.64.2 with lua builtin.

// config.json5
{
    $schema: "file:///C:/msys64/home/zhang/fastfetch/doc/json_schema.json",
    logo: null,
    modules: [
        {
            type: "gpu",
            format: "lua:gpus = gpus or {}; table.insert(gpus, ...)", // will be called for each GPU
        },
        {
            type: "custom", // prints dGPU if exists, otherwise iGPU
            key: "GPU",
            format: "lua:\
gpus = gpus or {};\
local dgpu = nil;\
for i, gpu in ipairs(gpus) do\
    if gpu.type == 'Discrete' then\
        dgpu = gpu;\
        break;\
    end;\
end;\
if dgpu then\
    return dgpu.vendor .. ' ' .. dgpu.name;\
elseif gpus[1] then\
    return gpus[1].vendor .. ' ' .. gpus[1].name;\
end",
        },
    ],
}

Kinda weird but it does work.

[Schaex]

Oh, I didn't know fastfetch has Lua support. Finally those years of using ComputerCraft pay out lol.

I tried your code snippet in version 2.64.0 (preinstalled via cachyos-extra-znver4) and also built 2.64.2-3 from source. It wasn't able to parse the json file with these line breaks. It would print the following error message:

Error: failed to parse JSON config file '...' at (145, 273): invalid escaped sequence in string

If I rewrite everything in a single line it does work, though:

"format": "lua:gpus = gpus or {}; local dgpu = nil; for i, gpu in ipairs(gpus) do if gpu.type == 'Discrete' then dgpu = gpu; break; end; end; if dgpu then return dgpu.vendor .. ' ' .. dgpu.name; elseif gpus[1] then return gpus[1].vendor .. ' ' .. gpus[1].name; end"

I will read the source code a bit more to get a better understanding of how I can use Lua here. The only thing I do understand right now is that I can define global variables that are accessible from all modules and that I can access module data as lua tables.

Thanks a lot!