A companion script for the BoogieBoard Sync 9.7 eWriter. The main purpose is to put the latest Bluetooth-synced page into the clipboard as image data. Depends on the `imagemagick-scan-to-mono.sh` script (see https://gist.github.com/kbauer/e5bd0dc12142e7a6c97f).

boogie-board-daemon

#!/usr/bin/env bash 

source libstacktrace || true
set -e -E -u

BOOGIEDIR="$(cygpath "$LOCALAPPDATA")/BoogieBoardSync/Downloads"
cd "$BOOGIEDIR"

MANUAL="

Usage: $0 --daemon
       $0 --rebuild
       $0 (-h | --help)

Builds png files for the pdf images downloaded from the boogieboard
into the directory 

    $BOOGIEDIR

and pushes the latest one to the clipboard. Uses two possible modes:

   --daemon
      Watch for new PDF files and convert them. Can be used to
      instantly obtain the latest scribble in the clipboard. 
      
   --rebuild
      Force rebuilding all PNG files. 
      
   -h, --help
      Show this help text.


This script assumes that you have the BoogieBoard Virtual Desktop
Companion software (Windows, MacOS) installed and enabled automatic
download over Bluetooth.

If you run it through Wine, you may have to set the LOCALAPPDATA
environment variable to point to the 'C:/Users/USER/Appdata/Local'
directory.

"

main() {
    if [[ $# = 0 ]]; then die 1 "$MANUAL"; fi
    if ishelp "$1"; then die 0 "$MANUAL"; fi
    if [[ $1 = --daemon ]]; then run_daemon; exit 0; fi
    if [[ $1 = --rebuild ]]; then run_rebuild; exit 0; fi
    die 2 "$MANUAL"
}


run_rebuild () {
    for pdffile in *.PDF; do 
        do_convert_then_pushto_clipboard "$pdffile"
    done
}


run_daemon () {
    while true; do 
        for pdffile in *.PDF; do 
            if ! [[ -e $pdffile ]]; then
                # Happens when *.PDF expand to literal *.PDF because no files exist yet.
                break
            elif ! [[ -e $(pngfile "$pdffile") ]]; then
                do_convert_then_pushto_clipboard "$pdffile"
            fi
        done
        sleep 1
    done
}


do_convert_then_pushto_clipboard () {
    local pdffile="$1"
    local pngfile=$(pngfile "$pdffile")
    convert -density 150 "pdf:$pdffile" "png:.tmp.png"
    imagemagick-scan-to-mono.sh ".tmp.png"
    rm ".tmp.png."*".bak" || true
    mv ".tmp.png" "$pngfile"
    printf "'%s' -> '%s'\n" "$pdffile" "$pngfile" 
    convert "png:$pngfile" -trim clipboard:myimage
}


pngfile () {
    echo "${1%.*}.PNG"
}


ishelp(){
    [[ $1 = -h ]] || [[ $1 = --help ]]
}


die() {
    local exitstatus="$1"; shift 1
    echo "$*"
    exit "$exitstatus"
}

main "$@"