#! /usr/bin/env bash

function abspath {
    (
        cd "$1"
        pwd
    )
}

function relpath {
    echo "$1" | sed "s#$(pwd)/\{0,1\}##g"
}

function lower {
    echo "$1" | tr A-Z a-z
}

function upper {
    echo "$1" | tr a-z A-Z
}

function init-skeleton {
    for i in $(cd ${skeleton} && find * -type d); do
        mkdir -p $(echo ${plugin_src}/$i)
    done

    for i in $(cd ${skeleton} && find * .??* -type f); do
        src=${skeleton}/$i
        dst=$(echo ${plugin_src}/$i)
        dst=$(echo $dst | sed "s#%NS_LOWER#${plugin_ns_lower}#g")
        dst=$(echo $dst | sed "s#%NAME_LOWER#${plugin_name_lower}#g")
        dst=$(echo $dst | sed "s#%NS#${plugin_ns}#g")
        dst=$(echo $dst | sed "s#%NAME#${plugin_name}#g")
        dst=$(echo $dst | sed "s#@#/#g")

        tmp=$dst.$$.tmp

        mkdir -p $(dirname ${dst})
        cp -p ${src} ${tmp} # Copy first to preserve permissions.
        cat ${src} |
            sed "s/@PLUGIN_NAME@/${plugin_name}/g" |
            sed "s/@PLUGIN_NAMESPACE@/${plugin_ns}/g" |
            sed "s/@PLUGIN_NAME_UPPER@/${plugin_name_upper}/g" |
            sed "s/@PLUGIN_NAMESPACE_UPPER@/${plugin_ns_upper}/g" |
            sed "s/@PLUGIN_NAME_LOWER@/${plugin_name_lower}/g" |
            sed "s/@PLUGIN_NAMESPACE_LOWER@/${plugin_ns_lower}/g" \
                >${tmp}

        if [ -e ${dst} ]; then
            cmp -s ${tmp} ${dst} || echo "$(relpath ${dst}) exists, not installing new version"
            rm -f ${tmp}
            continue
        fi

        echo Installing $(relpath ${dst}) ...
        mv ${tmp} ${dst}

    done
}

update=0

if [ "$1" == "-u" ]; then
    update=1
    shift
fi

if [ $# != 3 ]; then
    echo "Usage: $(basename $0) [-u] <dst-dir> <namespace> <plugin name>"
    exit 1
fi

dstdir=$1

if [ -e "${dstdir}" -a ${update} != 1 ]; then
    echo "error: ${dstdir} already exists, use -u if you want to update skeleton files in there."
    exit 1
fi

mkdir -p ${dstdir}
dstdir=$(abspath ${dstdir})

basedir=$(dirname $0)
skeleton=$(abspath ${basedir})/skeleton
plugin_ns=$2
plugin_name=$3
plugin_ns_lower=$(lower $2)
plugin_name_lower=$(lower $3)
plugin_ns_upper=$(upper $2)
plugin_name_upper=$(upper $3)
plugin_src=${dstdir}
plugin_build=${dstdir}/dylib

init-skeleton

which git >/dev/null 2>&1 && (cd ${dstdir} && git init . && git add .)