update rc.lua to add backgrounds

diff --git a/.config/awesome/rc.lua b/.config/awesome/rc.lua
index 59136b830ea4d7024999e1ed6750e11b2466af71..a3b3b94bf54219d83010183a7ec8d51c61625f79 100644 (file)
--- a/.config/awesome/rc.lua
+++ b/.config/awesome/rc.lua
@@ -13,6 +13,23 @@ require("obvious.battery")
 -- Load Debian menu entries
 require("debian.menu")
 
+-- from https://github.com/tony/awesome-config/blob/master/helpers.lua
+function clean(string)
+   s = string.gsub(string, '^%s+', '')
+   s = string.gsub(s, '%s+$', '')
+   s = string.gsub(s, '[\n\r]+', ' ')
+   return s
+end
+
+function file_exists(file)
+   local cmd = "/bin/dash -c 'if [ -e " .. file .. " ]; then echo true; fi;'"
+   local fh = io.popen(cmd)
+   
+   s = clean(fh:read('*a'))
+   
+   if s == 'true' then return true else return nil end
+end
+
 -- {{{ Variable definitions
 -- Themes define colours, icons, and wallpapers
 beautiful.init("/usr/share/awesome/themes/default/theme.lua")
@@ -21,9 +38,38 @@ beautiful.init("/usr/share/awesome/themes/default/theme.lua")
 terminal = "x-terminal-emulator"
 editor = os.getenv("EDITOR") or "editor"
 editor_cmd = terminal .. " -e " .. editor
+home = os.getenv("HOME")
 
 hostname = awful.util.pread("hostname -f"):gsub("\n", "")
 
+wallpaper_dir = home .. "/media/photos/gallery.donarmstrong.com/"
+if (not file_exists(wallpaper_dir)) then
+   wallpaper_dir = "/usr/share/awesome/themes/default/background.png"
+end
+
+wallpaper_cmd = "find " .. wallpaper_dir ..
+   " -xtype f \\( -iname '*.jpg' -o -iname '*.png' \\) " ..
+   " -not -name '.*' -print0 | shuf -n" .. screen.count() .. " -z | xargs -0 feh --bg-max"
+
+-- set up the wallpaper timer
+wallpaper_timer = timer { timeout = 0 }
+wallpaper_timer:add_signal("timeout",
+  function()
+     -- tell awsetbg to randomly choose a wallpaper from your wallpaper directory
+     if file_exists(wallpaper_dir) and whereis_app('feh') then
+        os.execute(wallpaper_cmd)
+     end
+     -- stop the timer (we don't need multiple instances running at the same time)
+     mytimer:stop()
+     
+     -- define the interval in which the next wallpaper change should occur in seconds
+     -- (in this case anytime between 10 and 20 minutes)
+     --restart the timer
+     mytimer.timeout = math.random(600,1200)
+                      mytimer:start()
+  end
+)
+
 -- Default modkey.
 -- Usually, Mod4 is the key with a logo between Control and Alt.
 -- If you do not like this or do not have such a key,