The loop in zab

zab-loop.sh

## wait for input
read -n 1 -s INPUT

#  Valid input:
#  
#  m: next line / slide
#  n: previous slide
#  q: quit presenter
while [ "$INPUT" != "q" ]; do

    case "$INPUT" in
        ( "m" ) 
		next;;
        ( "n" ) 
		prev;;
    	( "*" ) 
		echo "wtf";;
    esac

    if [ "$current_row" '<' 0 ] ; then 
        current_row=0
    fi

    if [ "$current_row" -gt "$file_lines_count" ] ; then 
        current_row=$file_lines_count
    fi

    # next input
    read -n 1 -s INPUT

done