ENH optimize battery polling

drawing/Processor.lua

@@ -205,9 +205,9 @@ local update = function(cr)
 	  CriticalText.set(core.coretemp_text, cr, Util.round_to_string(0.001 * Util.read_file(core.coretemp_path, nil, '*n')))
    end
 
-   local process_glob = Util.execute_cmd('ps -A -o s')
+   local process_glob = Util.execute_cmd('ps -A -o s h')
 
-   --subtract one from running b/c ps will always be "running"
+   -- subtract one from running b/c ps will always be "running"
    Text.set(process.value, cr,
             __string_format('%s | %s | %s | %s | %s',
                             (char_count(process_glob, 'R') - 1),

main.lua

@@ -169,7 +169,9 @@ cr_static = nil
 -- create some useful functions
 --
 local using_ac = function()
-   return Util.read_file('/sys/class/power_supply/AC/online', nil, '*n') == 1
+   -- for some reason it is much more efficient to test if the battery
+   -- is off than if the ac is on
+   return Util.read_file('/sys/class/power_supply/BAT0/status') ~= 'Discharging'
 end
 
 --
@@ -184,8 +186,6 @@ function conky_main()
    local _cw = conky_window
    if not _cw then return end
 
-   -- local time = os.clock()
-
    local cs = __cairo_xlib_surface_create(_cw.display, _cw.drawable,
 										  _cw.visual, 1920, 1080)
    local cr = __cairo_create(cs)
@@ -215,6 +215,4 @@ function conky_main()
    __cairo_surface_destroy(cs)
    __cairo_destroy(cr)
    __collectgarbage()
-
-   -- print(os.clock() - time)
 end