Split a scanned PDF at a separator page with a QR code

split.sh

#! /usr/bin/env nix-shell                                                                
#! nix-shell -i bash -p zbar poppler_utils                                               
                                                                                         
# Separate PDF                                                                           
pdfseparate scanned.pdf 'page-%02d.pdf'                                                  
                                                                                         
# Combine                                                                                
                                                                                         
pdfs=""                                                                                  
combined=0                                                                               
                                                                                         
names=(                                                                                  
"Mietvertrag"                                                                            
"Arbeitsvertrag"                                                                         
"Meldebestaetigung"                                                                      
)                                                                                        
                                                                                         
for f in page*; do                                                                       
  if zbarimg "$f" 2> /dev/null | grep -q "QR-Code:This is Daniels separator page"; then  
    pdfunite $pdfs "${names[combined]}.pdf"                                              
    combined=$((combined+1))                                                             
    pdfs=""                                                                              
  else                                                                                   
    pdfs="$pdfs $f"                                                                      
  fi                                                                                     
done                                                                                     
                                                                                         
pdfunite $pdfs "${names[combined]}.pdf"