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#!/bin/sh

set -euC

check_command () {
    echo -n "Checking for command $1 ... "
    if command -v "$1" >/dev/null
    then echo 'found!'
    else echo 'not available!'; exit 1
    fi
}

check_perl_deps () {
    for d in "$@"
    do
        echo -n "Checking for perl module $d ... "
        if perl -Ilib -e "use $d;"
        then echo 'found!'
        else echo 'not available!'; exit 1
        fi
    done
}

check_node_module () {
    echo -n "Checking for node module $1 ... "
    if [ -d "node_modules/$1" ]
    then echo 'found!'
    else echo 'not available!'; exit 1
    fi
}

check_ninja_version () {
    ninja_file="$(mktemp -t jwm-build-XXXXXXXX)"
    echo "ninja_required_version = $1" >>"$ninja_file"
    echo -n "Checking ninja version at least $1 ... "
    if ninja -f "$ninja_file" >/dev/null
    then echo 'sufficient!'
    else echo 'inadequate!'; exit 1
    fi
    rm "$ninja_file"
}

JWM_INIT=
if readlink /sbin/init | grep -q systemd
then JWM_INIT=systemd
fi

eval PERL_PATH="$(perl -V::installsitelib)"

allargs="$*"
while getopts 'c:d:e:i:hm:p:P:' opt
do case $opt in
    (e) JWM_MAILDIR_EXTRACTOR="$OPTARG";;
    (m) JWM_MODE="$OPTARG";;
    (c) JWM_LOGIN_SCHEME="$OPTARG";;
    (d) DESTDIR="$OPTARG";;
    (p) PREFIX="$OPTARG";;
    (P) PERL_PATH="$OPTARG";;
    (i) JWM_INIT="$OPTARG";;
    (h)
        t="$(printf '\t')"
        expand -t 38,68 <<END
usage: $0 configure [options...]

  OPTIONS
    FLAG ARGUMENT         DEFAULT     VALUES                           DESCRIPTION
    -e MAILDIR_EXTRACTOR  extractpy   {extractpy,extractpl,extractrs}
    -m MODE               development {development,production}
    -c LOGIN_SCHEME       plain       {plain,cram_md5}                 The login scheme (don't use plain unless over TLS)
    -d DESTDIR            /                                            Install root
    -p PREFIX             usr/local   {usr,usr/local}                  Install prefix
    -P PATH               $PERL_PATH$t$t  Perl install path
    -i INIT               $JWM_INIT $t{,systemd}                       Init system to install service files for
END
        exit
        ;;
    (*) exit 2;;
esac
done
shift $((OPTIND-1))
[ $# -gt 0 ] && { echo 'unknown arguments' >&2; exit 2; }

: "${JWM_MAILDIR_EXTRACTOR=extractpy}" && echo "$JWM_MAILDIR_EXTRACTOR" | grep -Eq '^extract(pl|py|rs)$'
: "${JWM_MODE=development}" && [ "$JWM_MODE" = development -o "$JWM_MODE" = production ]
: "${JWM_LOGIN_SCHEME=plain}" && [ "$JWM_LOGIN_SCHEME" = plain -o "$JWM_LOGIN_SCHEME" = cram_md5 ]
: "${DESTDIR=/}" && [ -d "$DESTDIR" ]
: "${PREFIX=usr/local}"

PATH="$(pwd)/node_modules/.bin${PATH:+:$PATH}"

check_command perl
check_perl_deps v5.24
check_command prove
check_command pod2man
check_command morbo
check_command hypnotoad
check_command npm
check_command esbuild
check_command sass
check_command ninja
check_ninja_version 1.11

check_perl_deps 'Mojolicious 9.31' Email::MIME Role::Tiny Class::Method::Modifiers TOML::Tiny namespace::clean Test2::Bundle::More MIME::Words

check_node_module bulma

if [ "$JWM_LOGIN_SCHEME" = cram_md5 ]
then
    check_node_module crypto-js
    check_perl_deps Digest::HMAC_MD5
fi

case "$JWM_MAILDIR_EXTRACTOR" in
    (extractpl)
        [ -x "$(pwd)/script/extract.pl" ]
        check_perl_deps Mail::Box::Maildir
        MAILDIR_EXTRACTOR_BIN=script/extract.pl
        ;;
    (extractpy)
        [ -x "$(pwd)/script/extract.py" ]
        check_command python3
        MAILDIR_EXTRACTOR_BIN=script/extract.py
        ;;
    (extractrs)
        [ -f "$(pwd)/extract/Cargo.toml" ] || { echo 'extractrs not available' >&2; exit; }
        JWM_EXTRACTRS_DIR=extract
        check_command cargo
        MAILDIR_EXTRACTOR_BIN=bin/jwebmail-extract
        ;;
esac

export LOGIN_SCHEME="$JWM_LOGIN_SCHEME"
export CONFARGS="$allargs"
export MAILDIR_EXTRACTOR_NAME="$JWM_MAILDIR_EXTRACTOR"
export MAILDIR_EXTRACTOR_BIN
export JWM_EXTRACTRS_DIR
export JWM_MODE
export JWM_INIT
export DESTDIR
export PREFIX
export PERL_PATH

perl -pe 's/@(\w+)@/$ENV{$1}/ga' lib/JWebmail/Config.pm.in >|lib/JWebmail/Config.pm
sh confninja.sh >|build.ninja