update-package-sets

#! /usr/bin/env nix-shell
#! nix-shell --show-trace ./emacs2nix.nix -i bash

usage(){
    local PROGNAME="$1"

    cat<<-EOF
Usage: ${PROGNAME} args
args can be at least one from: elpa-devel, elpa, nongnu-devel, nongnu.
EOF
}

update_set(){
    local PKGSET="$1"

    local output="${PKGSET}-generated.nix"
    local script="${PKGSET}-packages.sh"

    eval "${script} --names ${EMACS2NIX}/names.nix -o ${output}"
    nixfmt "${output}"
}

main(){
    local SETS=( )

    while (( $# )); do
        case $1 in
            "elpa-devel" | "elpa" | "nongnu-devel" | "nongnu")
                if [[ ! ${SETS[@]} =~ $1 ]]; then
                    SETS+=( "$1" )
                fi
                shift
                ;;
        *)
            echo "Unknown package set: $1"
            usage "update-package-sets"
            exit 1
            ;;
        esac
    done

    for SET in "${SETS[@]}"; do
        echo "${SET}: updating..."
        update_set "${SET}"
        echo "${SET}: updated"
    done
}

main "$@"