contrib: add nvidia infomation widget type

contrib/README

@@ -76,6 +76,14 @@ vicious.contrib.openweather
   - returns a table with string keys: {city}, {wind deg}, {wind aim},
     {wind kmh}, {wind mps}, {sky}, {weather}, {temp c}, {humid}, {press}
 
+vicious.contrib.nvinf
+  - provides GPU utilization, core temperature, clock frequency information
+    about Nvidia GPU from nvidia-settings
+  - takes optional card ID as an argument, i.e. "1", or defaults to ID 0
+  - returns first 4 values as usage of GPU core, memory, video engine and
+    PCIe bandwidth, 5th as temperature of requested graphics device, 6th
+    as frequency of GPU core, 7th as memory transfer rate
+
 vicious.contrib.nvsmi
   - provides (very basic) information about Nvidia GPU status from SMI
   - takes optional card ID as an argument, i.e. "1", or defaults to ID 0

contrib/nvinf.lua

@@ -0,0 +1,35 @@
+---------------------------------------------------
+-- Licensed under the GNU General Public License v2
+--  * (c) 2015, Ziyuan Guo <s10e.cn@gmail.com>
+---------------------------------------------------
+
+-- {{{ Grab environment
+local tonumber = tonumber
+local io = { popen = io.popen }
+local string = { gmatch = string.gmatch }
+local setmetatable = setmetatable
+local helpers = require("vicious.helpers")
+-- }}}
+
+
+-- vicious.widgets.nvinf
+local nvinf = {}
+
+
+-- {{{ NVIDIA infomation widget type
+local function worker(format, warg)
+    if not warg then warg = "0" end
+    local nv_inf = {}
+    local f = io.popen("LC_ALL=C nvidia-settings -q GPUUtilization -q [gpu:"..helpers.shellquote(warg).."]/GPUCoreTemp -q [gpu:"..helpers.shellquote(warg).."]/GPUCurrentClockFreqs -t")
+    local all_info = f:read("*all")
+    f:close()
+
+    for num in string.gmatch(all_info, "%d+") do
+        nv_inf[#nv_inf + 1] = tonumber(num)
+    end
+
+    return nv_inf
+end
+-- }}}
+
+return setmetatable(nvinf, { __call = function(_, ...) return worker(...) end })