initial commit

1 files changed, 38 insertions, 0 deletions

diff --git a/widgets/cpu.lua b/widgets/cpu.lua
new file mode 100644
index 0000000..d92bce8
--- /dev/null
+++ b/widgets/cpu.lua
@@ -0,0 +1,38 @@
+local wibox = require("wibox")
+local widgets = require("util.widgets")
+
+-- this is directly adapted from slstatus's cpu.c module
+local cpu_time = { 0,0,0,0,0,0,0 } -- user, nice, system, idle, iowait, irq, softirq
+
+function linux_cpu_usage(widget)
+	-- read stat
+	local statf = io.open("/proc/stat")
+	local stat_iter = statf:read():gmatch("%d+")
+	statf:close()
+
+	-- calc
+	local sum = 0
+	local a, b = cpu_time, {} -- set cpu_time as a for smaller code
+	table.move(a, 1, 7, 1, b) -- copy first 7 to b
+
+	for i = 1, 7 do
+		a[i] = stat_iter()
+		sum = sum + b[i] - a[i]
+	end
+
+	if sum == 0 then
+		return
+	end
+
+	local usage = ((b[1] + b[2] + b[3] + b[6] + b[7]) -
+	               (a[1] + a[2] + a[3] + a[6] + a[7])) * 100 / sum
+
+	widget:set_text(math.floor(usage))
+end
+
+-- return correct widget for os
+if osname == "Linux" then
+	return widgets.watchfn(linux_cpu_usage, 5)
+end
+
+return wibox.widget.textbox("unsupported os")