Create NVIDIA GPU usage/temperature widget

widget/contrib/nvidia.lua

@@ -0,0 +1,45 @@
+--[[
+
+     Licensed under GNU General Public License v2
+      * (c) 2013, Luca CPZ
+      * (c) 2022, tronfy <https://github.com/tronfy>
+
+--]]
+
+local helpers  = require("lain.helpers")
+local wibox    = require("wibox")
+
+-- NVIDIA GPU usage/temperature info (requires nvidia-smi)
+-- lain.widget.contrib.nvidia
+
+local function factory(args)
+    args           = args or {}
+
+    local nvidia   = { widget = args.widget or wibox.widget.textbox() }
+    local timeout  = args.timeout or 5
+    local exec     = args.exec or "nvidia-smi --query-gpu=utilization.gpu,temperature.gpu --format=csv,noheader,nounits"
+    local format   = args.format or "%.1f"
+    local settings = args.settings or function() end
+
+    function nvidia.update()
+        gpu = {
+            usage = "N/A",
+            temp  = "N/A"
+        }
+
+        helpers.async(exec, function(f)
+            -- f -> "usage, temp"
+            gpu.usage, gpu.temp = f:match("([^,]+),([^,]+)")
+            gpu.temp = string.format(format, gpu.temp)
+
+            widget = nvidia.widget
+            settings()
+        end)
+    end
+
+    helpers.newtimer("nvidia-gpu", timeout, nvidia.update)
+
+    return nvidia
+end
+
+return factory