Make cat-highlight work with multiple files

.config/zsh/functions.zsh

@@ -28,14 +28,26 @@ function export-emacs
     done
 }
 
-# Highlight cat output with whatever less is using for highlighting
+# Highlight cat output with whatever less is using for highlighting. The command
+# in ${LESSOPEN} needs to be able to work with multiple files.
 function cat-highlight()
 {
     # Check if we are in a terminal and $LESSOPEN is not empty
     if [[ -t 1 && -n "${LESSOPEN}" ]]; then
-        # Works only if command understands - as stdin
-        CATOPEN="${LESSOPEN/\%s/-}"
-        eval "\cat $@ ${CATOPEN}"
+        local -a args
+        local -a files
+        for arg in $@; do
+            # Filter out file names
+            if [[ "${arg:0:1}" != "-" ]]; then
+                files+="$arg"
+            else
+                args+="$arg"
+            fi
+        done
+
+        local catopen="${LESSOPEN/| /}"
+        catopen="${catopen/\%s/${files}}"
+        eval "${catopen} | \cat ${args}"
     else
         \cat $@
     fi