Revert "spotify: try to support the new version of Spotify"

This reverts commit 6c8985a9ae. Well, keep
old version of Spotify until MPRIS DBus support is updated.

lib/spotify.lua

@@ -8,67 +8,61 @@
 
 local awful = require("awful")
 local pairs = pairs
-local os    = os
 local capi = {
    client = client
 }
 
 module("vbe/spotify")
 
--- Get spotify window
-local function spotify()
+-- Send a command to spotify
+local function spotify(command)
+   awful.util.spawn("dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify " ..
+      "/org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player." .. command, false)
+end
+
+function playpause()
+   spotify("PlayPause")
+end
+
+function play()
+   -- Play seems unable to play in many situations, let's use
+   -- PlayPause instead.
+   spotify("PlayPause")
+end
+
+function pause()
+   spotify("Pause")
+end
+
+function stop()
+   spotify("Stop")
+end
+
+function next()
+   spotify("Next")
+end
+
+function previous()
+   spotify("Previous")
+end
+
+function show()
+   -- This should work, but no:
+   -- spotify("Raise")
    local clients = capi.client.get()
    for k, c in pairs(clients) do
       if awful.rules.match(c, { instance = "spotify",
                                 class = "Spotify" }) then
-         return c
+         if not c:isvisible() then
+            awful.tag.viewonly(c:tags()[1])
+         end
+         capi.client.focus = c
+         c:raise()
+         return
       end
    end
-   return nil
-end
-
--- Send a command to spotify
-local function cmd(command)
-   local client = spotify()
-   if client then
-      os.execute("xdotool key --window " .. client.window .. " " .. command)
-   end
-end
-
--- Show spotify
-function show()
-   local client = spotify()
-   if client then
-      if not client:isvisible() then
-         awful.tag.viewonly(client:tags()[1])
-      end
-      capi.client.focus = client
-      client:raise()
-   else
-      awful.util.spawn("spotify")
-   end
-end
-
-function playpause()
-   cmd("space")
-end
-
-function play()
-   cmd("XF86AudioPlay")
-end
-
-function pause()
-   cmd("XF86AudioPause")
-end
-
-function stop()
-   cmd("XF86AudioStop")
-end
-
-function next()
-   cmd("XF86AudioNext")
-end
-
-function previous()
-   cmd("XF86AudioPrev")
+   awful.util.spawn("spotify")
+   -- To disable notifications, add the following line to
+   -- ~/.config/spotify/Users/<spotifylogin>-user/prefs:
+   --   ui.track_notifications_enabled=false
 end