Use first arguments as wrapping value.

- Resistant to bad inputs.
- First checks if argument is a number and then checks if its greater than 2, if it's, the `wrapAt` variable is updated.

bin/scripts/test-fonts.sh

@@ -23,6 +23,7 @@ function print-decimal-unicode-range() {
   local allChars=""
   local allCodes=""
   local wrapAt=16
+  [[ "$wrappingValue" =~ ^[0-9]+$ ]] && [ "$wrappingValue" -gt 2 ] && wrapAt="$wrappingValue"
   local topLineStart="${bgColorBorder}╔═══"
   local topLineMiddle="═══╦═══"
   local topLineEnd="═══╗${reset_color}"
@@ -182,4 +183,6 @@ function test-fonts() {
   echo; echo
 }
 
+wrappingValue="$1"
+
 test-fonts