# -*- shell-script -*-

# Taken from:
# https://dev.0x50.de/projects/ftzsh/repository/revisions/master/entry/functions/hl

if ! [[ -x ${commands[highlight]} ]]; then
    printf 'hl: Could not find `highlight'\'' binary!\n'
    return 1
fi

local context file format lang suffix syntax theme o
local -i nopager=0
local -a pager hl_opts
local -A opt syntaxmap

while [[ $1 == -* ]]; do
    case $1 in
    (-c|--cat|--no-pager)
        nopager=1
        shift
        ;;
    (-F|--format)
        opt[format]=$2
        shift
        shift
        ;;
    (-h|--help)
        printf 'usage: hl [OPTION(s)] <file(s)>\n'
        return 0
        ;;
    (-l|--list)
        (   printf 'available languages (syntax parameter):\n\n' ;
            highlight --list-langs ; ) | less -SM
        return 0
        ;;
    (-P|--pager)
        opt[pager]=$2
        shift
        shift
        ;;
    (-s|--syntax)
        opt[syntax]=$2
        shift
        shift
        ;;
    (-t|--themes)
        (   printf 'available themes (style parameter):\n\n' ;
            highlight --list-themes ; ) | less -SM
        return 0
        ;;
    (-T|--theme)
        opt[theme]=$2
        shift
        shift
        ;;
    (*)
        printf 'hl: Unknown option `%s'\''!\n' $1
        printf 'usage: hl [OPTION(s)] <file(s)>\n'
        return 1
        ;;
    esac
done

if (( ${#argv} < 1 )) ; then
    printf 'usage: hl [OPTION(s)] <file(s)>\n'
    printf '    available options: --list (-l), --themes (-t), --help (-h)\n'
    printf '                       --no-pager (--cat, -c), --syntax (-s)\n'
    (( ${#argv} > 2 )) && printf '  Too many arguments.\n'
    return 1
fi

syntaxmap=(
    scm lisp
)

for file in "$@"; do
    suffix=${file:e}
    context=":functions:hl:$OSTYPE:$TERM:$suffix"
    hl_opts=()
    syntax=''

    if (( ${+opt[format]} )); then
        format=${opt[format]}
    else
        if ! zstyle -a $context format format; then
            case $TERM in
            ((screen|xterm)-256color)
                format=xterm256
                ;;
            (*)
                format=ansi
                ;;
            esac
        fi
    fi

    if (( ${+opt[theme]} )); then
        theme=${opt[theme]}
    else
        zstyle -s $context theme theme || theme=solarized-dark
    fi

    if (( nopager )); then
        pager=cat
    elif (( ${+opt[pager]} )); then
        pager=${(z)opt[pager]}
    else
        zstyle -a $context pager pager || pager=( less -Mr )
    fi

    if (( ${+opt[syntax]} )); then
        syntax=${opt[syntax]}
    else
        if ! zstyle -s $context syntax syntax; then
            (( ${+syntaxmap[$suffix]} )) && syntax=${syntaxmap[$suffix]}
        fi
    fi
    [[ -n $syntax ]] && hl_opts=( --syntax=$syntax )

    highlight --out-format=$format "${hl_opts[@]}" --style=$theme $file \
        | "${pager[@]}"
done

return 0