some cpu usage improvements

[etc/awesome.git] / widgets / alsabar.lua

diff --git a/widgets/alsabar.lua b/widgets/alsabar.lua
index f504cc0213d3d4e755059b383467b61510c50b56..7e8cd5a4bd09b277d2c692f98931d86a1fdecbdd 100644 (file)
--- a/widgets/alsabar.lua
+++ b/widgets/alsabar.lua
@@ -8,12 +8,12 @@
 --]]
 
 local newtimer     = require("lain.helpers").newtimer
+local read_pipe    = require("lain.helpers").read_pipe
 
 local awful        = require("awful")
 local beautiful    = require("beautiful")
 local naughty      = require("naughty")
 
-local io           = { popen  = io.popen }
 local math         = { modf   = math.modf }
 local mouse        = mouse
 local string       = { format = string.format,
@@ -122,35 +122,31 @@ local function worker(args)
 
     function alsabar.update()
         -- Get mixer control contents
-        local f = assert(io.popen(string.format("%s get %s", alsabar.cmd, alsabar.channel)))
-        local mixer = f:read("*all")
-        f:close()
+        local mixer = read_pipe(string.format("%s get %s", alsabar.cmd, alsabar.channel))
 
         -- Capture mixer control state:          [5%] ... ... [on]
         local volu, mute = string.match(mixer, "([%d]+)%%.*%[([%l]*)")
 
-        if volu == nil then
-            volu = 0
-            mute = "off"
-        end
-
-        alsabar._current_level = tonumber(volu)
-        alsabar.bar:set_value(alsabar._current_level / 100)
-        if not mute and tonumber(volu) == 0 or mute == "off"
+        if tonumber(volu) ~= alsabar._current_level or string.match(mute, "on") ~= alsabar._muted
         then
-            alsabar._muted = true
-            alsabar.tooltip:set_text (" [Muted] ")
-            alsabar.bar:set_color(alsabar.colors.mute)
-        else
-            alsabar._muted = false
-            alsabar.tooltip:set_text(string.format(" %s:%s ", alsabar.channel, volu))
-            alsabar.bar:set_color(alsabar.colors.unmute)
+            alsabar._current_level = tonumber(volu)
+            alsabar.bar:set_value(alsabar._current_level / 100)
+            if not mute and tonumber(volu) == 0 or mute == "off"
+            then
+                alsabar._muted = true
+                alsabar.tooltip:set_text (" [Muted] ")
+                alsabar.bar:set_color(alsabar.colors.mute)
+            else
+                alsabar._muted = false
+                alsabar.tooltip:set_text(string.format(" %s:%s ", alsabar.channel, volu))
+                alsabar.bar:set_color(alsabar.colors.unmute)
+            end
+
+            volume_now = {}
+            volume_now.level = tonumber(volu)
+            volume_now.status = mute
+            settings()
         end
-
-        volume_now = {}
-        volume_now.level = tonumber(volu)
-        volume_now.status = mute
-        settings()
     end
 
     alsabar.bar:buttons (awful.util.table.join (