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[dotfiles/.git] / .config / awesome / lain / widget / cpu.lua

diff --git a/.config/awesome/lain/widget/cpu.lua b/.config/awesome/lain/widget/cpu.lua
new file mode 100644 (file)
index 0000000..f4cce73
--- /dev/null
+++ b/.config/awesome/lain/widget/cpu.lua
@@ -0,0 +1,75 @@
+--[[
+
+     Licensed under GNU General Public License v2
+      * (c) 2013,      Luca CPZ
+      * (c) 2010-2012, Peter Hofmann
+
+--]]
+
+local helpers  = require("lain.helpers")
+local wibox    = require("wibox")
+local math     = math
+local string   = string
+local tostring = tostring
+
+-- CPU usage
+-- lain.widget.cpu
+
+local function factory(args)
+    local cpu      = { core = {}, widget = wibox.widget.textbox() }
+    local args     = args or {}
+    local timeout  = args.timeout or 2
+    local settings = args.settings or function() end
+
+    function cpu.update()
+        -- Read the amount of time the CPUs have spent performing
+        -- different kinds of work. Read the first line of /proc/stat
+        -- which is the sum of all CPUs.
+        for index,time in pairs(helpers.lines_match("cpu","/proc/stat")) do
+            local coreid = index - 1
+            local core   = cpu.core[coreid] or
+                           { last_active = 0 , last_total = 0, usage = 0 }
+            local at     = 1
+            local idle   = 0
+            local total  = 0
+
+            for field in string.gmatch(time, "[%s]+([^%s]+)") do
+                -- 4 = idle, 5 = ioWait. Essentially, the CPUs have done
+                -- nothing during these times.
+                if at == 4 or at == 5 then
+                    idle = idle + field
+                end
+                total = total + field
+                at = at + 1
+            end
+
+            local active = total - idle
+
+            if core.last_active ~= active or core.last_total ~= total then
+                -- Read current data and calculate relative values.
+                local dactive = active - core.last_active
+                local dtotal  = total - core.last_total
+                local usage   = math.ceil((dactive / dtotal) * 100)
+
+                core.last_active = active
+                core.last_total  = total
+                core.usage       = usage
+
+                -- Save current data for the next run.
+                cpu.core[coreid] = core
+            end
+        end
+
+        cpu_now = cpu.core
+        cpu_now.usage = cpu_now[0].usage
+        widget = cpu.widget
+
+        settings()
+    end
+
+    helpers.newtimer("cpu", timeout, cpu.update)
+
+    return cpu
+end
+
+return factory