Align rule table display widths

lib/common.sh

@@ -57,18 +57,16 @@ log_ok() { _log_with_color "${CLR_GREEN}" OK "$@"; }
 
 display_width() {
   local input=${1-}
-  awk -v str="${input}" 'BEGIN {
-    n = split(str, chars, "")
-    width = 0
-    for (i = 1; i <= n; i++) {
-      if (chars[i] ~ /[ -~]/) {
-        width += 1
-      } else {
-        width += 2
-      }
-    }
-    print width
-  }'
+  local char code width=0
+  while IFS= read -r -n1 char; do
+    code=$(printf '%d' "'${char}")
+    if (( code >= 32 && code <= 126 )); then
+      ((width += 1))
+    else
+      ((width += 2))
+    fi
+  done < <(printf '%s' "${input}")
+  printf '%s\n' "${width}"
 }
 
 repeat_char() {