#!/bin/bash


set -x 
TMPDIR="$(mktemp -d)"

mkdir -p "$TMPDIR/a"
mkdir -p "$TMPDIR/b"
cp -l "$1" "$TMPDIR/a/file.pdf";
if [ -e "${1}.annot" ]; then
    cp "$1" "$TMPDIR/b/file.pdf";
    chmod u+w "$TMPDIR/b/file.pdf"
    qprint -d "${1}.annot" | patch -d "$TMPDIR/b" --binary;
else
    chmod u+w "$TMPDIR/b/file.pdf"
    cp "$1" "$TMPDIR/b/file.pdf";
fi;


(cd "$TMPDIR/b"
 chmod u+w "file.pdf"
 ## evince really should just use the same document-directory
 gsettings set org.gnome.Evince document-directory "'file://$TMPDIR/b'";
 evince "file.pdf"
);

(cd "$TMPDIR";
 diff -Nura a b ) | qprint -e > "${1}.annot"
rm -f "$TMPDIR/a/file.pdf"
rm -f "$TMPDIR/b/file.pdf"
rmdir "$TMPDIR/a" "$TMPDIR/b" "$TMPDIR"