add actual restore instructions in the document

Fixes intra2net#16

paperbackup.py

@@ -187,9 +187,19 @@ def finish_page(pdf, canv, pageno):
 outlines.append("")
 outlines.append("")
 outlines.append("--")
-outlines.append("Created with paperbackup.py")
-outlines.append("See https://github.com/intra2net/paperbackup/ for instructions")
-
+outlines.append("Created with paperbackup.py from https://github.com/intra2net/paperbackup/")
+outlines.append("To restore, either scan this document into a file or use a webcam")
+outlines.append("This shell script should restore the content inline")
+outlines.append("# zbarimg ends each scanned code with a newline")
+outlines.append("# each barcode content begins with ^<number><space>")
+outlines.append("# so convert that to \0<number><space>, so sort can sort on that")
+outlines.append("# then remove all \n\0<number><space> so we get the originial without newlines added")
+outlines.append("/usr/bin/zbarimg '$SCANNEDFILE' --raw -Sdisable -Sqrcode.enable \")
+outlines.append("    | sed -e "s/\^/\x0/g" \")
+outlines.append("    | sort -z -n \")
+outlines.append("    | sed ':a;N;$!ba;s/\n\x0[0-9]* //g;s/\x0[0-9]* //g;s/\n\x0//g'")
+outlines.append("# replace 'zbarimg $SCANNEDFILE"' with 'zbarcam' if you have a webcam instead of a scanned document")
+
 # use "enscript" to create postscript with the plaintext
 p = subprocess.Popen(
         ["enscript", "-p"+temp_text_path, "-f", "Courier12",