Bash GUI for QPDF

 
#!/bin/bash

endmenu() {
  echo "Bye bye."
  exit 0;
}

getDestinationFile() 
{
   retValue=$(zenity --file-selection  --save --file-filter='PDF files (pdf) | *.pdf' --title="Select a PDF file (Destination)")
 
	case $? in
		0)
		    destinationPDFFile=$retValue
		    ;;
	esac
}

getOriginFiles() 
{
   retValue=$(zenity --file-selection  --multiple --file-filter='PDF files (pdf) | *.pdf' --title="Select a PDF files to merge")
 
	case $? in
		0)
		    originPDFFiles=$retValue
		    ;;
	esac
}

showOriginFiles()
{
   declare -i index
   index=1
   mylistFiles=()
   tmpmylistFiles=()
   IFS='|' 
   
   read -ra files <<< "$originPDFFiles"  
   for file in "${files[@]}";
   do
 	 tmpmylistFiles+=("$file" ) 
   done
   
   readarray -t tmpmylistFiles < <(printf '%s\n' "${tmpmylistFiles[@]}" | sort)
      
   for file in "${tmpmylistFiles[@]}";
   do
 	 mylistFiles+=("$index" "$file" )
	 let index++
   done    
   
   retValue=$(zenity --list  --hide-header --height=400 --width=700  --title='Files To Merge' --column=ID --column=Files  "${mylistFiles[@]}" ) 
   echo $retValue
 
}

mergeFiles()
{
   mylistFiles=()
   IFS='|'
   continua=1
   
   if [ -z "${destinationPDFFile}" ]; then   
     zenity --info --text="No destination file selected."
     continua=0
   fi
   
   if [ $continua == 1 ]; then 
	   if [ -z "${originPDFFiles}" ]; then   
		 zenity --info --text="No select files to merge."
		 continua=0
	   fi   
   fi
   
   if [ $continua == 1 ]; then
   
	   read -ra files <<< "$originPDFFiles"  
	   for file in "${files[@]}";
	   do
	   echo $file
		 mylistFiles+=("$file" ) 
		 let index++
	   done  
	   
	   readarray -t mylistFiles < <(printf '%s\n' "${mylistFiles[@]}" | sort)
	   
	   qpdf --empty --pages "${mylistFiles[@]}" -- "${destinationPDFFile}"
   fi   
}

mainmenu() 
{
	choice=$(zenity --height=250 --list  --hide-header --text "Select action" --ok-label="Select" --cancel-label="Exit" \
	                --title "Main Menu - Merge file" --radiolist  --column="ID" --column="Action" \
	                1 "File Destination" 2 "Add Files To Merge" 3 "View Files To Merge" 4 "Merge" )

	case $choice in
		     "File Destination")
								getDestinationFile
								mainmenu
		            			;;
		     "Add Files To Merge") 
								getOriginFiles
								mainmenu
		            			;;
		     "View Files To Merge")
							   showOriginFiles                   		     
							   mainmenu
		           			   ;; 
		     "Merge")
		                       mergeFiles
		                       mainmenu
		           	           ;;
	esac

}




mainmenu