Try `lesspipe` in addition to `lesspipe.sh` for LESSOPEN

Debian based systems have `lesspipe`, without '.sh' suffix.
Since `$commands` is an associative array, we do index search and set
the input preprocessor on first match.

runcoms/zprofile

@@ -57,8 +57,9 @@ path=(
 export LESS='-F -g -i -M -R -S -w -X -z-4'
 
 # Set the Less input preprocessor.
-if (( $+commands[lesspipe.sh] )); then
-  export LESSOPEN='| /usr/bin/env lesspipe.sh %s 2>&-'
+# Try both `lesspipe` and `lesspipe.sh` as either might exist on a system.
+if (( $#commands[(i)lesspipe(|.sh)] )); then
+  export LESSOPEN="| /usr/bin/env $commands[(i)lesspipe(|.sh)] %s 2>&-"
 fi
 
 #