#!/bin/sh

die() {
    echo "$0: error: $1"
    exit 2
}

sbcache="$PWD/.sbcache"
[ ! -d $sbcache ] && mkdir "$sbcache"

# [utilities]
match_files() {
    find . -maxdepth 1 -type f -name "$1"
}

match_files_recurse() {
    find . -type f -name "$1"
}

ext() {
    match_files "*.$1"
}

ext_all() {
    match_files_recurse "*.$1"
}

depends() {
    modified=""
    continue_anyway="false"
    for i in "$@"; do
        # if any of the files are new or modifed, we will let the caller continue execution
        case "$i" in
            _*)
                "$i" >/dev/null
                if [ $? -ne 3 ]; then
                    continue_anyway="true"
                fi
                ;;
            *)
                cachepath="$sbcache/.$(basename $i).sbmod"
                if [ ! -f "$cachepath" ] || [ $(cat "$cachepath") != $(stat -c '%Y' "$i") ]; then
                    echo $(stat -c '%Y' "$i") > "$cachepath"
                    modified="${modified} ${i}"
                fi
                ;;
        esac
    done

    if [ "$modified" = "" ] && [ "$continue_anyway" == "false" ]; then
        echo "return 3"
        return
    fi
    echo 'modified="$modified"'
}

# load the file, making its functions and variables available here and vice-versa
sbfile="$PWD/sbrc"
[ ! -f "$sbfile" ] && die "no such sbrc in current directory"
. "$sbfile"

# run functions from the file as requested by the user
case "$1" in
    "")
        __default
        if [ $? -eq 3 ]; then
            exit 0
        fi
        ;;
    *)
        "_$1" || die "failed to run script $1"
        ;;
esac