From 237470c8f45190b213e3a173ce6ae1a74b3e11fe Mon Sep 17 00:00:00 2001
From: "Adrian C. (anrxc)" <anrxc@sysphere.org>
Date: Sun, 14 Mar 2010 01:55:33 +0100
Subject: API: transform widgets namespace table to a directory

---
 widgets/cpu.lua | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 widgets/cpu.lua

(limited to 'widgets/cpu.lua')

diff --git a/widgets/cpu.lua b/widgets/cpu.lua
new file mode 100644
index 0000000..3dfc22f
--- /dev/null
+++ b/widgets/cpu.lua
@@ -0,0 +1,78 @@
+---------------------------------------------------
+-- Licensed under the GNU General Public License v2
+--  * (c) 2010, Adrian C. <anrxc@sysphere.org>
+--  * (c) 2009, Lucas de Vries <lucas@glacicle.com>
+---------------------------------------------------
+
+-- {{{ Grab environment
+local ipairs = ipairs
+local io = { lines = io.lines }
+local setmetatable = setmetatable
+local math = { floor = math.floor }
+local table = { insert = table.insert }
+local string = {
+    find = string.find,
+    gmatch = string.gmatch
+}
+-- }}}
+
+
+-- Cpu: provides CPU usage for all available CPUs/cores
+module("vicious.widgets.cpu")
+
+
+-- Initialise function tables
+local cpu_usage  = {}
+local cpu_total  = {}
+local cpu_active = {}
+
+-- {{{ CPU widget type
+local function worker(format)
+    local cpu_lines = {}
+
+    -- Get CPU stats
+    for line in io.lines("/proc/stat") do
+        if string.find(line, "^cpu") then
+            cpu_lines[#cpu_lines+1] = {}
+
+            for i in string.gmatch(line, "[%s]+([%d]+)") do
+                  table.insert(cpu_lines[#cpu_lines], i)
+            end
+        end
+    end
+
+    -- Ensure tables are initialized correctly
+    while #cpu_total < #cpu_lines do
+        table.insert(cpu_total,  0)
+        table.insert(cpu_active, 0)
+        table.insert(cpu_usage,  0)
+    end
+
+    local total_new   = {}
+    local active_new  = {}
+    local diff_total  = {}
+    local diff_active = {}
+
+    for i, v in ipairs(cpu_lines) do
+        -- Calculate totals
+        total_new[i]  = 0
+        for j = 1, #v do
+            total_new[i] = total_new[i] + v[j]
+        end
+        active_new[i] = v[1] + v[2] + v[3]
+
+        -- Calculate percentage
+        diff_total[i]  = total_new[i]  - cpu_total[i]
+        diff_active[i] = active_new[i] - cpu_active[i]
+        cpu_usage[i]   = math.floor(diff_active[i] / diff_total[i] * 100)
+
+        -- Store totals
+        cpu_total[i]   = total_new[i]
+        cpu_active[i]  = active_new[i]
+    end
+
+    return cpu_usage
+end
+-- }}}
+
+setmetatable(_M, { __call = function(_, ...) return worker(...) end })
-- 
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