fish: use ruby instead of awk for word of the moment

fish/prompt

@@ -22,8 +22,8 @@ function fish_greeting
 	if test -f /usr/share/dict/words && test (which shuf)
 		set_color c50ed2
 
-		echo "Word of the moment: "(shuf -n1 /usr/share/dict/words) |
-			awk -f $_agw_dir_rc/text/mid.awk col=$COLUMNS
+		echo -n "Word of the moment: "(shuf -n1 /usr/share/dict/words) |
+			ruby -e 'puts $stdin.read.center ARGV[0].to_i' $COLUMNS
 
 		set_color normal
 	end

text/mid.awk

@@ -1,6 +0,0 @@
-{
-	z = col - length
-	y = int(z / 2)
-	x = z - y
-	printf "%*s%s%*s\n", x, "", $0, y, ""
-}