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#!/bin/bash
# vim: set sw=4 sts=4 et tw=80 :

# Author:        Ciaran McCreesh <ciaranm@gentoo.org>
# Purpose:       Display ebuild keywords in a graphical form
# Invocation:    eshowkw [-a] [ packagename ] (defaults to current directory if no
#                packagename is provided, -a shows all arches, including prefix)

shopt -s extglob

PID_TO_KILL=$$

die() {
    echo "$@" 1>&2
    kill $PID_TO_KILL
}

trap 'exit 250' 15

get_portage_dir() {
    local dir
    if [[ -z ${portage_dir_cache} ]] ; then
        for dir in "${HOME}/cvs/gentoo-x86" "/usr/portage" ; do
            [[ -d ${dir}/profiles ]] && portage_dir_cache=${dir} && break
        done
    fi
    [[ -z ${portage_dir_cache} ]] && portage_dir_cache=$(portageq portdir )
    export portage_dir_cache
    echo ${portage_dir_cache}
}

version_sort() {
    local items= left=0
    items=( $@ )

    while [[ ${left} -lt ${#items[@]} ]] ; do
        local lowest_idx=${left}
        local idx=$(( ${lowest_idx} + 1 ))
        while [[ ${idx} -lt ${#items[@]} ]] ; do
            version_compare "${items[${lowest_idx}]}" "${items[${idx}]}"
            [[ $? -eq 3 ]] && lowest_idx=${idx}
            idx=$(( ${idx} + 1 ))
        done
        local tmp=${items[${lowest_idx}]}
        items[${lowest_idx}]=${items[${left}]}
        items[${left}]=${tmp}
        left=$(( ${left} + 1 ))
    done
    echo ${items[@]}
}

version_compare() {
    local ver_a=${1} ver_b=${2} parts_a parts_b cur_idx_a=0 cur_idx_b=0
    parts_a=( $(get_all_version_components "${ver_a}" ) )
    parts_b=( $(get_all_version_components "${ver_b}" ) )

    ### compare number parts.
    local inf_loop=0
    while true ; do
        # grab the current number components
        local cur_tok_a=${parts_a[${cur_idx_a}]}
        local cur_tok_b=${parts_b[${cur_idx_b}]}

        # number?
        if [[ -n ${cur_tok_a} ]] && [[ -z ${cur_tok_a//[[:digit:]]} ]] ; then
            cur_idx_a=$(( ${cur_idx_a} + 1 ))
            [[ ${parts_a[${cur_idx_a}]} == "." ]] \
                && cur_idx_a=$(( ${cur_idx_a} + 1 ))
        else
            cur_tok_a=""
        fi

        if [[ -n ${cur_tok_b} ]] && [[ -z ${cur_tok_b//[[:digit:]]} ]] ; then
            cur_idx_b=$(( ${cur_idx_b} + 1 ))
            [[ ${parts_b[${cur_idx_b}]} == "." ]] \
                && cur_idx_b=$(( ${cur_idx_b} + 1 ))
        else
            cur_tok_b=""
        fi

        # done with number components?
        [[ -z ${cur_tok_a} ]] && [[ -z ${cur_tok_b} ]] && break

        # to avoid going into octal mode, strip any leading zeros. otherwise
        # bash will throw a hissy fit on versions like 6.3.068.
        cur_tok_a=${cur_tok_a##+(0)}
        cur_tok_b=${cur_tok_b##+(0)}

        # if a component is blank, make it zero.
        [[ -z ${cur_tok_a} ]] && cur_tok_a=0
        [[ -z ${cur_tok_b} ]] && cur_tok_b=0

        # compare
        [[ ${cur_tok_a} -lt ${cur_tok_b} ]] && return 1
        [[ ${cur_tok_a} -gt ${cur_tok_b} ]] && return 3
    done

    ### number parts equal. compare letter parts.
    local letter_a=
    letter_a=${parts_a[${cur_idx_a}]}
    if [[ ${#letter_a} -eq 1 ]] && [[ -z ${letter_a/[a-z]} ]] ; then
        cur_idx_a=$(( ${cur_idx_a} + 1 ))
    else
        letter_a="@"
    fi

    local letter_b=
    letter_b=${parts_b[${cur_idx_b}]}
    if [[ ${#letter_b} -eq 1 ]] && [[ -z ${letter_b/[a-z]} ]] ; then
        cur_idx_b=$(( ${cur_idx_b} + 1 ))
    else
        letter_b="@"
    fi

    # compare
    [[ ${letter_a} < ${letter_b} ]] && return 1
    [[ ${letter_a} > ${letter_b} ]] && return 3

    ### letter parts equal. compare suffixes in order.
    local suffix rule part r_lt r_gt
    for rule in "alpha=1" "beta=1" "pre=1" "rc=1" "p=3" "r=3" ; do
        suffix=${rule%%=*}
        r_lt=${rule##*=}
        [[ ${r_lt} -eq 1 ]] && r_gt=3 || r_gt=1

        local suffix_a=
        for part in ${parts_a[@]} ; do
            [[ ${part#${suffix}} != ${part} ]] && \
                [[ -z ${part##${suffix}*([[:digit:]])} ]] && \
                suffix_a=${part#${suffix}}0
        done

        local suffix_b=
        for part in ${parts_b[@]} ; do
            [[ ${part#${suffix}} != ${part} ]] && \
                [[ -z ${part##${suffix}*([[:digit:]])} ]] && \
                suffix_b=${part#${suffix}}0
        done

        [[ -z ${suffix_a} ]] && [[ -z ${suffix_b} ]] && continue

        [[ -z ${suffix_a} ]] && return ${r_gt}
        [[ -z ${suffix_b} ]] && return ${r_lt}

        # avoid octal problems
        suffix_a=${suffix_a##+(0)} ; suffix_a=${suffix_a:-0}
        suffix_b=${suffix_b##+(0)} ; suffix_b=${suffix_b:-0}

        [[ ${suffix_a} -lt ${suffix_b} ]] && return 1
        [[ ${suffix_a} -gt ${suffix_b} ]] && return 3
    done

    ### no differences.
    return 2
}

get_all_version_components() {
    local ver_str=${1} result result_idx=0
    result=( )

    while [[ -n "$ver_str" ]] ; do
        case "${ver_str:0:1}" in
            # number: parse whilst we have a number
            [[:digit:]])
                result[$result_idx]="${ver_str%%[^[:digit:]]*}"
                ver_str="${ver_str##+([[:digit:]])}"
                result_idx=$(($result_idx + 1))
                ;;

            # separator: single character
            [-_.])
                result[$result_idx]="${ver_str:0:1}"
                ver_str="${ver_str:1}"
                result_idx=$(($result_idx + 1))
                ;;

            # letter: grab the letters plus any following numbers
            [[:alpha:]])
                local not_match="${ver_str##+([[:alpha:]])*([[:digit:]])}"
                result[$result_idx]=${ver_str:0:$((${#ver_str} - ${#not_match}))}
                ver_str="${not_match}"
                result_idx=$(($result_idx + 1))
                ;;

            # huh?
            *)
                result[$result_idx]="${ver_str:0:1}"
                ver_str="${ver_str:1}"
                result_idx=$(($result_idx + 1))
                ;;
        esac
    done

    echo ${result[@]}
}

get_package_dir() {
    if [[ -z ${1} ]] ; then
        pwd
        return 0
    fi

    if [[ -d ${1} ]] ; then
        readlink -f ${1}
        return 0
    fi

    get_portage_dir 1>/dev/null
    if [[ ${1/\/} != ${1} ]] ; then
        local d=$(get_portage_dir )/${1}
        if [[ -d ${d} ]] ; then
            echo ${d}
            return 0
        fi
    else
        local d
        d=( $(echo $(get_portage_dir )/*-*/${1} ) )
        if [[ ${#d[@]} -gt 1 ]] ; then
            die "${1} is ambiguous"
        elif [[ -d ${d[0]} ]] ; then
            echo ${d[0]}
            return 0
        fi
    fi

    return 1
}

repeat() {
    local i
    for (( i=0 ; i < ${1} ; i=$(( ${i} + 1 )) )) ; do
        echo -n "${2}"
    done
}

get_keywords() {
    (
        inherit() { :; }
        source ${1} 2>/dev/null
        echo ${KEYWORDS}
    )
}

colorarch() {
    case "${1}" in
        amd64)
            echo -n -e "\033[0;33m${2}\033[0;0m"
            ;;
        x86)
            echo -n -e "\033[0;31m${2}\033[0;0m"
            ;;
        *)
            echo -n "${2}"
            ;;
    esac
}

colourise() {
    case "${1}" in
        \*)
            echo -n -e "\033[0;31m*\033[0;0m"
            ;;
        +)
            echo -n -e "\033[0;32m+\033[0;0m"
            ;;
        -)
            echo -n -e "\033[0;31m-\033[0;0m"
            ;;
        \~)
            echo -n -e "\033[0;33m~\033[0;0m"
            ;;
        *)
            echo -n "${1}"
            ;;
    esac
}

show_keyword_diagram() {
    echo -n -e "Keywords for \033[1;34m"
    local title=$(readlink -f $(pwd ) )
    title=${title#$(readlink -f ../.. )/*( )}
    echo -n "${title}"
    echo -e "\033[0;0m:"
    echo

    local archs= arch_length=0 arch=
    if [[ $1 == "true" ]]; then
        archs=( $( grep -v '^# Prefix keywords' $(get_portage_dir )/profiles/arch.list ) )
    else
        archs=( $( sed '/^\# Prefix keywords/,$ d' $(get_portage_dir )/profiles/arch.list ) )
    fi
    for arch in "${archs[@]}" ; do
        [[ ${#arch} -gt ${arch_length} ]] && arch_length=${#arch}
    done

    local versions= pkgname= version_length=0 version=
    pkgname=$(basename $(readlink -f ./ ) )
    versions=( $(for e in $(echo *.ebuild ) ; do \
            [[ -f ${e} ]] && echo ${e} | sed -e 's/\.ebuild$//g' \
                    -e "s/^${pkgname}-//g" ; \
            done ) )
    versions=( $(version_sort ${versions[@]} ) )
    for version in "${versions[@]}" ; do
        [[ ${#version} -gt ${version_length} ]] && version_length=${#version}
    done

    local i=0 archletter=
    for (( i = 0 ; i < ${arch_length} ; i=$(( ${i} + 1 )) )) ; do
        repeat ${version_length} " "
        echo -n " | "
        for arch in "${archs[@]}" ; do
            archletter="${arch:${i}:1}"
            echo -n "$(colorarch "${arch}" "${archletter:- }" ) "
        done
        echo
    done

    repeat ${version_length} "-"
    echo -n "-+"
    repeat ${#archs[@]} "--"
    echo

    for version in "${versions[@]}" ; do
        echo -n "${version}"
        repeat $(( ${version_length} - ${#version} )) " "
        echo -n " | "

        local keyword keywords
        keywords=( $(get_keywords "${pkgname}-${version}.ebuild" ) )
        for arch in "${archs[@]}" ; do
            local display=" "
            [[ ${keywords[@]/-\*} != ${keywords[@]} ]] && display="*"
            for keyword in "${keywords[@]}" ; do
                [[ ${arch} == "${keyword#[~-]}" ]] && \
                    display=${keyword:0:1} && \
                    break;
            done
            [[ -z ${display#[~ *-]} ]] || display="+"
            echo -n "$(colourise "${display}" ) "
        done

        echo
    done
}

main() {
    if [[ $1 == "-a" ]]; then
        all_arches=true
        shift
    else
        all_arches=false
    fi
    local dir=$(get_package_dir "${1}" )
    [[ -z ${dir} ]] && die "Couldn't find '${1}'"
    cd ${dir}
    [[ $(echo *.ebuild ) != "*.ebuild" ]] || die "No ebuilds in ${dir}"
    show_keyword_diagram $all_arches
    true
}

main "$@"