# hl() highlighted less
emulate -L zsh

local theme lang
theme=${HL_THEME:-""}
case ${1} in
(-l|--list)
    ( printf 'available languages (syntax parameter):\n\n' ;
        highlight --list-langs ; ) | less -SMr
    ;;
(-t|--themes)
    ( printf 'available themes (style parameter):\n\n' ;
        highlight --list-themes ; ) | less -SMr
    ;;
(-h|--help)
    printf 'usage: hl <syntax[:theme]> <file>\n'
    printf '    available options: --list (-l), --themes (-t), --help (-h)\n\n'
    printf '  Example: hl c main.c\n'
    ;;
(*)
    if [[ -z ${2} ]] || (( ${#argv} > 2 )) ; then
        printf 'usage: hl <syntax[:theme]> <file>\n'
        printf '    available options: --list (-l), --themes (-t), --help (-h)\n'
        (( ${#argv} > 2 )) && printf '  Too many arguments.\n'
        return 1
    fi
    lang=${1%:*}
    [[ ${1} == *:* ]] && [[ -n ${1#*:} ]] && theme=${1#*:}
    if [[ -n ${theme} ]] ; then
        highlight -O xterm256 --syntax ${lang} --style ${theme} ${2} | less -SMr
    else
        highlight -O ansi --syntax ${lang} ${2} | less -SMr
    fi
    ;;
esac
return 0