spotify-widget: check for utf8 support

which is only availble in Lua 5.3+. Tested using Lua 5.1.5

1 files changed, 5 insertions, 1 deletions

diff --git a/spotify-widget/spotify.lua b/spotify-widget/spotify.lua
index 0eb302a..f8df1ea 100644
--- a/spotify-widget/spotify.lua
+++ b/spotify-widget/spotify.lua
@@ -16,6 +16,10 @@ local GET_SPOTIFY_STATUS_CMD = 'sp status'
 local GET_CURRENT_SONG_CMD = 'sp current'
 
 local function ellipsize(text, length)
+    -- utf8 only available in Lua 5.3+
+    if utf8 == nil then
+        return text:sub(0, length)
+    end
     return (utf8.len(text) > length and length > 0)
         and text:sub(0, utf8.offset(text, length - 2) - 1) .. '...'
         or text
@@ -154,4 +158,4 @@ end
 
 return setmetatable(spotify_widget, { __call = function(_, ...)
     return worker(...)
-end })
\ No newline at end of file
+end })