Zsh-ify lessfilter

.lessfilter

@@ -2,17 +2,21 @@
 # Try to use highlight. If that fails or the output looks suspicious, use
 # lesspipe normally.
 
-command -v highlight > /dev/null || return 1
+setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
+
+command -v highlight > /dev/null
 file="${1}"
 
 local output="$(highlight --force \
                           --out-format=truecolor \
                           --style=base16/unikitty-reversible \
                           --stdout "${file}")"
-[[ ${?} -eq 0 ]] || return 1
+ret=${?}
+[[ ${ret} -eq 0 ]] || return ${ret}
 
 # Try to catch when the output is just the magic string
-if [[ ${#output} -lt 256 && $(stat --printf="%s" "${file}") -gt 256 ]]; then
+zmodload zsh/stat
+if [[ ${#output} -lt 256 && $(zstat +size "${file}") -gt 256 ]]; then
     return 1
 fi