pdf2remarkable

#!/bin/bash
# Inspired by Adrian Daerr 2017/2018 - public domain

transferPdf() {
    local pdfname="$1"
    local tmpdir="$2"
    local target_dir="$3"

    uuid="$(uuidgen)"
    cp -- "$pdfname" "${tmpdir}/${uuid}.pdf"
    cat <<EOF >>"${tmpdir}/${uuid}.metadata"
{
    "deleted": false,
    "lastModified": "$(date +%s)000",
    "metadatamodified": false,
    "modified": false,
    "parent": "",
    "pinned": false,
    "synced": false,
    "type": "DocumentType",
    "version": 1,
    "visibleName": "$(basename -- "$pdfname" .pdf)"
}
EOF

    cat <<EOF >"${tmpdir}/${uuid}.content"
{
    "extraMetadata": {
    },
    "fileType": "pdf",
    "fontName": "",
    "lastOpenedPage": 0,
    "lineHeight": -1,
    "margins": 100,
    "pageCount": 1,
    "textScale": 1,
    "transform": {
        "m11": 1,
        "m12": 1,
        "m13": 1,
        "m21": 1,
        "m22": 1,
        "m23": 1,
        "m31": 1,
        "m32": 1,
        "m33": 1
    }
}
EOF

    mkdir "${tmpdir}/${uuid}.cache"
    mkdir "${tmpdir}/${uuid}.highlights"
    mkdir "${tmpdir}/${uuid}.thumbnails"

    convert -density 300 "$pdfname"'[0]' \
        -colorspace Gray \
        -separate -average \
        -shave 5%x5% \
        -resize 280x374 \
        "${tmpdir}/${uuid}.thumbnails/0.jpg"

    echo "Transferring $pdfname as $uuid"
    scp -r "${tmpdir}/${uuid}."* "$target_dir"
    rm -rf "${tmpdir}/${uuid}."*
}

checkConnection() {
    local host="$1"

    echo "Checking connection to host: $host"
    ssh -o ConnectTimeout=5 -o BatchMode=yes -q "$host" "exit 0"

    # shellcheck disable=SC2181
    if [[ $? != 0 ]]; then
        return 10
    fi
}

usage() {
    cat <<EOF
Usage: $(basename "$0") [-h|--help] [--no-restart] FILE...

Options:
    -h, --help          Help message
    --no-restart        Do not restart xochitl after transfer
    --host HOST         override the ssh-host
    --xochitl-dir PATH  override the xochitl-dir
    --local             use 'local-remarkable' as hostname
EOF
}

shortOpts="h"
longOpts="help,no-restart,host:,xochitl-dir:,local"
args=$(getopt -o "$shortOpts" -l "$longOpts" -- "$@")

# shellcheck disable=SC2181
if [[ $? != 0 ]]; then
    usage
    exit 1
fi

eval set -- "$args"

restart="true"
remarkable_host=${REMARKABLE_HOST:-remarkable}
remarkable_xochitl_dir=${REMARKABLE_XOCHITL_DIR:-.local/share/remarkable/xochitl/}

while true; do
    case "$1" in
        -h | --help)
            shift
            usage
            exit 1
            ;;
        --no-restart)
            shift
            restart="true"
            ;;
        --host)
            shift
            remarkable_host="$1"
            shift
            ;;
        --local)
            shift
            remarkable_host="local-remarkable"
            ;;
        --)
            shift
            break
            ;;
        *)
            usage
            exit 1
            ;;
    esac
done

if [[ $# -lt 1 ]]; then
    usage
    exit 1
fi

if ! checkConnection "$remarkable_host"; then
    echo "Connection to host '$remarkable_host' not possible, aborting..."
    exit 255
fi

echo -e "Connection successful: host=$remarkable_host\n"

tmpdir="$(mktemp --directory --suffix='.pdf2remarkable')"

for pdfname in "$@"; do
    transferPdf "$pdfname" "$tmpdir" "${remarkable_host}:${remarkable_xochitl_dir}"
done

rmdir "$tmpdir"

if [[ $restart == "true" ]]; then
    echo "Restarting Xochitl..."
    ssh "$remarkable_host" "systemctl restart xochitl"
    echo "Done."
fi