Make zsh-compatible.

wled

@@ -13,6 +13,11 @@ VERSION="0.1.3"
 exit_code=0
 host_list=
 
+# Shell specific options.
+case "$(readlink /proc/$$/exe)" in
+    */zsh) setopt SH_WORD_SPLIT ;;
+esac
+
 # Make the exit status of command pipelines the status of the last command
 # with non-zero exit status - if supported by this shell.
 (set -o pipefail 2>/dev/null) && set -o pipefail
@@ -70,10 +75,15 @@ current_brightness() {
         sed -n 's/.*"state"[[:space:]]*:[[:space:]]*{[^}]*"bri"[[:space:]]*:[[:space:]]*\([0-9]\{1,3\}\).*/\1/p'
 }
 
+if test $# -eq 0; then
+    print_help
+    exit 0
+fi
+
 # Parse instance argument and store hostnames.
 while test $# -gt 0; do
     case "$1" in
-        ""|-h|--help) # Missing instance parameter.
+        -h|--help)
             print_help
             exit 0
         ;;
@@ -131,7 +141,7 @@ for wled_host in $host_list; do
             api_resp=$(curl_send "{'ps':$1}" "http://$wled_host/json")
         ;;
         l|list) # List presets.
-            printf "loading ...\r"
+            test -t 1 && printf 'connecting ...\r'
             active_ps=$(active_preset "$wled_host")
             curl_fetch "http://$wled_host/presets.json" | \
                 # Insert newline in front of every preset slice.