Refactor

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

zet

@@ -78,7 +78,7 @@ edit_zet() {
   query="$1"
 
   if [[ "$1" == "last" ]]; then
-    file="$(find "$ZET_DIR" -type f -name "index.adoc" | sort | tail -1)"
+    file="$(get_last_zet)"
   else
     file="$(get_filepath_for_zet "$query")"
   fi
@@ -124,6 +124,10 @@ get_filepath_for_zet() {
   echo "${ZET_DIR}/$1/index.adoc"
 }
 
+get_last_zet() {
+  find "$ZET_DIR" -type f -name "index.adoc" | sort | tail -1
+}
+
 get_zet_id_from_filename() {
   basename "$(dirname "$file")"
 }