#!/bin/sh -e

# source this file and use these functions.

# getalpinepatches <tree>/<package> [timeout]
getalpinepatches() {
    [ -n "$1" ] \
    || { echo "usage: $(basename $0) <package> [timeout]" && exit 0; }

    [ "$1" != "-c" ] || { shift; cached="yes"; }
    [ "$1" != "-r" ] || { shift; reparse="yes"; }

    name="$1"
    timeout=${2:-5}

    cleanup() { [ -f "$temp" ] && rm "$temp"; }
    trap cleanup EXIT

    temp="$(mktemp)"

    # main
    #url="https://git.alpinelinux.org/aports/tree/$name?h=master"
    #pre="tree listing"
    #pst="<\/table"
    #rex="href='.+\/([^\/]+.patch)'"
    #plain="https://git.alpinelinux.org/aports/plain"

    # github mirror
    url="https://github.com/alpinelinux/aports/tree/master/$name"
    pre="repository-content"
    pst="footer container"
    rex='title="([^\/]+.patch)"'
    plain="https://raw.githubusercontent.com/alpinelinux/aports/master"

    # extract the text between the pre and post regexes on the target webpage.
    { curl --compressed -m $timeout -L -s $url \
    || { echo "url failed" >&2 && continue; }; } \
    | awk "sub(/^.*$pre/,\"\"){echo=1} /$pst/{echo=0} echo" \
    > $temp

    perl -n -e "/$rex/ && print \"\$1\\n\"" $temp | while read path; do
        curl -LO "$plain/$name/$path"
    done
}

# importalpinepatches <tree>/<package> [timeout]
importalpinepatches() {
    mkdir patches-enabled patches-available
    cd patches-available
    getalpinepatches $1 $2
    [ "$(ls)" ] || { cd .. && return 0; }
    cd ../patches-enabled
    ln -s ../patches-available/* .
    ls
    cd ..
}

# howfromalpine <tree>/<package> [lix-name [timeout]]
howfromalpine() {
    alpinepkg="$1"
    pkg="$2"
    pkgs="${HOWROOT:-/lix-os/how}/pkg"

    [ "$pkg" ] || pkg="${alpinepkg#*/}"

    cd "$pkgs"
    mkdir -p "$pkg/default"
    cd "$pkg/default"
    
    plain="https://raw.githubusercontent.com/alpinelinux/aports/master"
    curl -LO "$plain/$alpinepkg/APKBUILD"
    cp APKBUILD "conf.sh"
    cp APKBUILD "make.sh"
    cp APKBUILD "inst.sh"
    cp "$pkgs/../default/deps" .
    chmod +x *.sh

    importalpinepatches "$alpinepkg" $3

    cat APKBUILD | grep "source="
}

# srcnewtar <name> <version> <type> <arc url> [sig url]
srcnewtar() {
    [ "$SRCROOT" != "" ] || { echo "please specify SRCROOT" && exit 1; }

    if [ ! "$4" ]; then
        echo "usage: $0 <name> <version> <type> <arc url> [sig url]"
        exit
    fi

    name="$1"
    version="$2"
    type="$3"
    arcurl="$(eval "echo \"$4\"")"
    sigurl="$(eval "echo \"$5\"")"
    mkdir -p $SRCROOT/pkg/$name
    tmpdir="$(mktemp -d)"

    arcdest="$tmpdir/$name-$version.$type"
    sigdest="$tmpdir/$name-$version.$type.sig"

    [ ! "$(echo "$name" | cut -d/ -f2)" ] || mkdir -p "$tmpdir/$(dirname "$name")"

    curl -L -o "$arcdest" "$arcurl"
    size="$(wc -c "$arcdest" | cut -d' ' -f1)" 
    sum="$(sha512sum "$arcdest" | cut -d' ' -f1)" 

    cat << EOF > $SRCROOT/pkg/$name/defaults.sh
version="$version"
type="$type"
EOF

    printf "\$version\t\$type\tarc\t$4\n" >> $SRCROOT/pkg/$name/urls
    printf "$version\t$type\tarc\t$size\t$sum\n" >> $SRCROOT/pkg/$name/checks

    if [ "$sigurl" ]; then
        curl -L -o "$sigdest" "$sigurl"
        size="$(wc -c "$sigdest" | cut -d' ' -f1)" 
        sum="$(sha512sum "$sigdest" | cut -d' ' -f1)" 

        printf "\$version\t\$type\tsig\t$5\n" >> $SRCROOT/pkg/$name/urls
        printf "$version\t$type\tsig\t$size\t$sum\n" >> $SRCROOT/pkg/$name/checks
    fi

    printf "\n$name defaults.sh\n======\n"
    cat $SRCROOT/pkg/$name/defaults.sh

    printf "\n$name urls\n======\n"
    cat $SRCROOT/pkg/$name/urls

    printf "\n$name checks\n======\n"
    cat $SRCROOT/pkg/$name/checks

    rm -fr "$tmpdir"
}

# srcnewgit <name> <version> <arc url>
srcnewgit() {
    [ "$SRCROOT" != "" ] || { echo "please specify SRCROOT" && exit 1; }

    if [ ! "$3" ]; then
        echo "usage: $0 <name> <version> <arc url>"
        exit
    fi

    name="$1"
    version="$2"
    arcurl="$(eval "echo \"$3\"")"
    mkdir -p $SRCROOT/pkg/$name

    tmpdir="$(mktemp -d)"
    arcdest="$tmpdir/$name-$version"

    git clone --mirror "$arcurl" "$arcdest"

    cd "$arcdest"
    size="$(git count-objects -vH | grep size-pack | cut -d': ' -f2)"
    sum="$(find . -type f ! -path '**/.git/**' ! -name '.git' | sort | xargs sha512sum | cut -d' ' -f1 | sha512sum | cut -d' ' -f1)"
    cd - >/dev/null

    cat << EOF > $SRCROOT/pkg/$name/defaults.sh
version="$version"
type="git"
EOF

    printf "\$version\tgit\tarc\t$3\n" >> $SRCROOT/pkg/$name/urls
    printf "$version\tgit\tarc\t$size\t$sum\n" >> $SRCROOT/pkg/$name/checks

    printf "\n$name defaults.sh\n======\n"
    cat $SRCROOT/pkg/$name/defaults.sh

    printf "\n$name urls\n======\n"
    cat $SRCROOT/pkg/$name/urls

    printf "\n$name checks\n======\n"
    cat $SRCROOT/pkg/$name/checks

    rm -fr "$tmpdir"
}