From 51da084705fe51d2c877c0f8ccd65ff4992e4ae7 Mon Sep 17 00:00:00 2001
From: "martin f. krafft" <madduck@madduck.net>
Date: Thu, 10 Mar 2016 11:13:11 +0100
Subject: [PATCH] suspend apps without focus

---
 .config/awesome/rc.lua | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/.config/awesome/rc.lua b/.config/awesome/rc.lua
index e630208..18209c0 100644
--- a/.config/awesome/rc.lua
+++ b/.config/awesome/rc.lua
@@ -576,6 +576,27 @@ function hook_battery()
 end
 -- }}}
 
+-- from https://blog.mister-muffin.de/2014/11/07/automatically-suspending-cpu-hungry-applications/
+client.add_signal("focus", function(c)
+  if c.class == "Iceweasel" or c.class == "chromium" or c.class == "Icedove" then
+    awful.util.spawn("kill -CONT " .. c.pid)
+  end
+end)
+client.add_signal("unfocus", function(c)
+  local capi = { timer = timer }
+  if c.class == "Iceweasel" or c.class == "chromium" or c.class == "Icedove" then
+    local timer_stop = capi.timer { timeout = 10 }
+    local send_sigstop = function ()
+      timer_stop:stop()
+      if client.focus.pid ~= c.pid then
+        awful.util.spawn("kill -STOP " .. c.pid)
+      end
+    end
+    timer_stop:add_signal("timeout", send_sigstop)
+    timer_stop:start()
+  end
+end)
+
 -- {{{ Statusbar battery
 --
 function get_acpibatt()
-- 
2.39.5