Introduced the truncate helper.

Function takes two arguments, the text to be truncated and the max
lenght. Last three characters will be replaced by "...". Mbox and MPD
widgets that previously did it them selves are now using this helper.

helpers.lua

@@ -5,7 +5,10 @@
 
 -- {{{ Grab environment
 local pairs = pairs
-local string = { gsub = string.gsub }
+local string = {
+    sub = string.sub,
+    gsub = string.gsub
+}
 -- }}}
 
 
@@ -38,4 +41,16 @@ function escape(text)
     return text and text:gsub("[\"&'<>]", xml_entities)
 end
 -- }}}
+
+--{{{ Truncate a string
+function truncate(text, maxlen)
+    txtlen = text:len()
+
+    if txtlen > maxlen then
+        text = text:sub(1, maxlen - 3) .. "..."
+    end
+
+    return text
+end
+-- }}}
 -- }}}

mbox.lua

@@ -36,9 +36,7 @@ function worker(format, mbox)
         subject = helpers.escape(subject)
 
         -- Don't abuse the wibox, truncate
-        if subject:len() > 22 then
-            subject = subject:sub(1, 19) .. "..."
-        end
+        subject = helpers.truncate(subject, 22)
 
         return {subject}
     end

mpd.lua

@@ -34,12 +34,22 @@ function worker(format)
     nowplaying = helpers.escape(np)
 
     -- Don't abuse the wibox, truncate
-    if nowplaying:len() > 30 then
-        nowplaying = nowplaying:sub(1, 27) .. "..."
-    end
+    nowplaying = helpers.truncate(nowplaying, 30)
 
     return {nowplaying}
 end
 -- }}}
 
 setmetatable(_M, { __call = function(_, ...) return worker(...) end })
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