puttmpninja: Return with error code if curl fails

.config/zsh/functions/puttmpninja

@@ -7,16 +7,17 @@ zmodload zsh/zutil
 local -a o_help=()
 zparseopts -D -K -- h=o_help
 if [[ ${#o_help} -ne 0 || ! -v 1 ]]; then
-    ret=$(( ${#o_help} ^ 1 ))
+    local ret=$(( ${#o_help} ^ 1 ))
     print -u $(( 1 + ${ret} )) -l "usage: ${0} [-h] <FILE> …" \
           "\e[3mFiles on tmp.ninja expire after 48 hours.\e[0m"
     return ${ret}
 fi
 
 for file in ${@}; do
-    print -n '\e[0;94m'
+    print -Pn '%F{12}'
     local url=$(curl --progress-bar --form "files[]=@${file}" \
                      'https://tmp.ninja/upload.php?output=text')
-    print '\e[1;95m→\e[0m' "\e[0;97m${url}\e[0m" \
+    [[ ${url} == "" ]] && return 1
+    print -P '%B%F{13}→%f%b' "%F{15}${url}%f" \
           "\e[3;90mexpires: $(date --date='now + 2 days')\e[0m"
 done