dotfiles/.config/zsh/functions/cat-highlight

#!/usr/bin/env zsh
# Highlight cat output with whatever less is using for highlighting. The command
# in $LESSOPEN needs to be able to work with multiple files.

# Check if we are in a terminal and $LESSOPEN is not empty
if [[ -t 1 && -n "${LESSOPEN}" ]]; then
    # Programs that won't work with cat
    local -a known_bad=("lesspipe")
    for baddy in ${known_bad}; do
        if [[ "${LESSOPEN}" =~ "${baddy}" ]]; then
            \cat "${@}"
            return ${?}
        fi
    done

    local -a args
    local -a files
    for arg in "${@}"; do
        # Filter out file names
        if [[ "${arg[1]}" != "-" ]]; then
            files+="${arg}"
        else
            args+="${arg}"
        fi
    done

    local catopen="${LESSOPEN/|/}"
    eval "${catopen/\%s/${files}} | \cat ${args}"
else
    \cat "${@}"
fi