Add support for the nil type and empty arrays

lib/serv.sh

@@ -42,12 +42,25 @@ parse_err() {
 }
 
 parse_bulk() {
-  bulk=1
+  if [[ $1 = \$-1 ]]; then
+    (( lines_left -= 1 ))
+    printf '(nil)\n'
+  else
+    bulk=1
+  fi
 }
 
 parse_arr() {
-  lines_left=${1:1}
-  arr=1
+  if [[ $1 = \*-1 ]]; then
+    (( lines_left -= 1 ))
+    printf '(nil)\n'
+  elif [[ $1 = \*0 ]]; then
+    (( lines_left -= 1 ))
+    printf '(empty array)\n'
+  else
+    lines_left=${1:1}
+    arr=1
+  fi
 }
 
 parse_other() {