script: function style

top_words.sh

@@ -3,9 +3,14 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
+fetch_top_words() {
+  local url
+  local basedir
+  
   url="${1:-}"
   basedir=$(dirname "$0")
   
+
   if [[ "${url:-}" = "" ]]; then
     grep --only-matching --extended-regexp '[a-zA-Z]{3,}' "$basedir/README.md" \
     | tr '[:upper:]' '[:lower:]' \
@@ -22,3 +27,5 @@ else
     | uniq --count \
     | sort -n
   fi
+}
+fetch_top_words "$@"