fix #155 plus some improvements

- trim long artist/song names
- dim widget if spotify is paused

spotify-widget/spotify.lua

@@ -5,15 +5,22 @@
 -- https://github.com/streetturtle/awesome-wm-widgets/tree/master/spotify-widget
 
 -- @author Pavel Makhov
--- @copyright 2018 Pavel Makhov
+-- @copyright 2020 Pavel Makhov
 -------------------------------------------------
 
 local awful = require("awful")
 local wibox = require("wibox")
 local watch = require("awful.widget.watch")
+local naughty = require("naughty")
 
 local GET_SPOTIFY_STATUS_CMD = 'sp status'
-local GET_CURRENT_SONG_CMD = 'sp current-oneline'
+local GET_CURRENT_SONG_CMD = 'sp current'
+
+local function ellipsize(text, length)
+    return (text:len() > length and length > 0)
+        and text:sub(0, length - 3) .. '...'
+        or text
+end
 
 local spotify_widget = {}
 
@@ -24,24 +31,53 @@ local function worker(args)
     local play_icon = args.play_icon or '/usr/share/icons/Arc/actions/24/player_play.png'
     local pause_icon = args.pause_icon or '/usr/share/icons/Arc/actions/24/player_pause.png'
     local font = args.font or 'Play 9'
+    local dim_when_paused = args.dim_when_paused == nil and false or args.dim_when_paused
+    local dim_opacity = args.dim_opacity or 0.2
+    local max_length = args.max_length or 15
+    local show_tooltip = args.show_tooltip == nil and false or args.show_tooltip
+
+    local cur_artist = ''
+    local cur_title = ''
+    local cur_album = ''
 
     spotify_widget = wibox.widget {
+        {
+            id = 'artistw',
+            font = font,
+            widget = wibox.widget.textbox,
+        },
         {
             id = "icon",
             widget = wibox.widget.imagebox,
         },
         {
-            id = 'current_song',
-            widget = wibox.widget.textbox,
-            font = font
+            id = 'titlew',
+            font = font,
+            widget = wibox.widget.textbox
         },
         layout = wibox.layout.align.horizontal,
         set_status = function(self, is_playing)
             self.icon.image = (is_playing and play_icon or pause_icon)
+            if dim_when_paused then
+                self.icon.opacity = (is_playing and 1 or dim_opacity)
+
+                self.titlew:set_opacity(is_playing and 1 or dim_opacity)
+                self.titlew:emit_signal('widget::redraw_needed')
+
+                self.artistw:set_opacity(is_playing and 1 or dim_opacity)
+                self.artistw:emit_signal('widget::redraw_needed')
+            end
         end,
-        set_text = function(self, path)
-            self.current_song.markup = path
-        end,
+        set_text = function(self, artist, song)
+            local artist_to_display = ellipsize(artist, max_length)
+            if self.artistw.text ~= artist_to_display then
+                self.artistw.text = artist_to_display
+            end
+            local title_to_display = ellipsize(song, max_length)
+            if self.titlew.text ~= title_to_display then
+                self.titlew.text = title_to_display
+            end
+        end
     }
 
     local update_widget_icon = function(widget, stdout, _, _, _)
@@ -50,12 +86,22 @@ local function worker(args)
     end
 
     local update_widget_text = function(widget, stdout, _, _, _)
-        local escaped = string.gsub(stdout, "&", '&')
         if string.find(stdout, 'Error: Spotify is not running.') ~= nil then
-            widget:set_text('')
+            widget:set_text('','')
             widget:set_visible(false)
-        else
-            widget:set_text(escaped)
+            return
+        end
+
+        local escaped = string.gsub(stdout, "&", '&')
+        local album, album_artist, artist, title =
+            string.match(escaped, 'Album%s*(.*)\nAlbumArtist%s*(.*)\nArtist%s*(.*)\nTitle%s*(.*)\n')
+
+        if album ~= nil and title ~=nil and artist ~= nil then
+            cur_artist = artist
+            cur_title = title
+            cur_album = album
+
+            widget:set_text(artist, title)
             widget:set_visible(true)
         end
     end
@@ -80,6 +126,22 @@ local function worker(args)
         end)
     end)
 
+
+    if show_tooltip then
+        local spotify_tooltip = awful.tooltip {
+            mode = 'outside',
+            preferred_positions = {'bottom'},
+         }
+
+        spotify_tooltip:add_to_object(spotify_widget)
+
+        spotify_widget:connect_signal('mouse::enter', function()
+            spotify_tooltip.markup = '<b>Album</b>: ' .. cur_album
+                .. '\n<b>Artist</b>: ' .. cur_artist
+                .. '\n<b>Song</b>: ' .. cur_title
+        end)
+    end
+
     return spotify_widget
 
 end